Material mass balance and elemental flow analysis in a submerged anaerobic membrane bioreactor for municipal wastewater treatment towards low-carbon operation and resource recovery.

The anaerobic membrane bioreactor (AnMBR) has gained huge attention as a municipal wastewater (MWW) treatment process that combined high organics removal, a low sludge yield and bioenergy recovery. In this study, a 20 L AnMBR was set up and operated steadily for 70 days in temperate conditions with an HRT of 6 h and a flux of 12 LMH for the treatment of real MWW, focusing on the behavior of the major elements (C, N, P and S) from an elemental balance perspective. The results showed that the AnMBR achieved more than 85 % COD removal, a low sludge yield (0.081 gVSS/gCODremoved) and high methane production (0.31 L-CH4/gCODremoved) close to the theoretical value. The elemental flow analysis revealed that the AnMBR converted 77 % of the influent COD to methane (57 % gaseous and 20 % dissolved) and 6 % of the COD for sludge production. In addition, the AnMBR converted 34 % of the total carbon to energy-generated carbon, and only 3 % was in the form of CO2 in the biogas for further upgradation, which was in line with the concept of carbon neutrality. Since little nitrogen or phosphorus were removed, the permeate was nutrient-rich and further treatment to recover the nutrients would be required. This study illustrates the superior performance of the AnMBR for MWW treatment with a microscopic view of elemental behavior and provides a reference for implementing the mainstream AnMBR process in carbon-neutral wastewater treatment plants.

Biodeinking of waste papers using combinatorial fungal enzymes and subsequent production of butanol from effluent.

The present study aimed to enzymatic deinking of waste papers and to valorize the effluent for biobutanol production. Application of fungal enzymatic cocktail (cellulase, amylase, xylanase, pectinase, lipase, and ligninase) on office used paper, newspaper, and ballpen written paper leading to improvement in brightness (84.91, 72.51, 76.69 % ISO), InKd (82.89, 68.95, 76.49%), κ-number (12.9, 13.6, and 13.1), opacity (27.91, 30.07, and 2.85%), tensile strength (49.24, 45.31, and 46.98 Nm/g), respectively and indices were consistent with chemical treated pulps. The quality of effluent generated during enzymatic deinking in respect to BOD and COD level was eco-friendlier than the chemical process. The enzyme-treated effluent was employed as supporting substrate for butanol (18.4 g/l) production by Clostridium acetobutylicum ATCC824. Material balance and life cycle assessment of the whole processes were evaluated to validate its industrial and environmental relevance.

The synergistic and trade-off effects of economic-environmental-health improvement in agriculture sector: evidence from China.

Typical non-parametric frontier analysis based on material balance principle (MBP) is superior for measuring agricultural economic-environmental trade-offs when considering the flow of materials, but fails to incorporate the serious health effects caused by excessive use of pesticides. Here, using MBP-based data envelopment analysis, we measure the economic-environmental-health performances and trade-offs of agricultural production in China during 2006-2016. Evaluation results indicate that (i) the average agricultural sector would be able to produce current output with 16.3% fewer inputs; (ii) 17 million tons CO2 reduction potentials (9.6% of total emissions in 2016) could be realized through technical efficiency promotion without damaging environmental, health, and economic performances; (iii) synergistic effects on agricultural performance promotion exist in 12 regions indicating that the improvement of technical efficiency and the adjustment of input mix would simultaneously lead to 0.2-74.3% reductions on costs and pollutions; and (iv) improving cost efficiency in 18 regions and improving pollution efficiency in another 11 regions would be the most beneficial strategies for their agricultural sectors which would lead to additional reductions on total (economic, environmental, and health) costs by 10.3-22.5%.

Pollutant removal from landfill leachate via two-stage anoxic/oxic combined membrane bioreactor: Insight in organic characteristics and predictive function analysis of nitrogen-removal bacteria.

A two-stage anoxic/oxic combined membrane bioreactor (A/O-A/O-MBR) was operated for 81 d to treat landfill leachate under different reflux ratios (R). The best performance was found under R = 150%, where the chemical oxygen demand (COD), ammonium (NH4+-N) and total nitrogen (TN) removal was 85.6%, 99.3%, and 80.7%, respectively. Particularly, the highest pollutant removal was achieved in the second-stage A/O, where the COD and TN removal capacity was 78.88 and 11.74 g/d, respectively. Meantime, DOM removal was 83.9%, where the removal of aromatic protein substances I and II, fulvic acids-like compounds, soluble microbial products and humic acids-like compounds was 93.4%, 86.4%, 72.0%, 86.6% and 59.4%, respectively. The gene functions of microbial community in the process showed that amoA, hao, nirK and nosZ, etc. were the core genes for nitrification and denitrification. The carbon source for denitrification might come from the conversion of refractory organic matters in landfill leachate.

[Effect of HRT on Denitrifying Phosphorus and Nitrogen Removal in Modified A2/O-BAF].

The effect of hydraulic retention time (HRT) on denitrifying phosphorus and nitrogen removal in a modified two sludge A2/O-BAF system was studied. The influent COD, NH4+-N, and TP were 189.6, 60.4, and 5.1 mg·L-1, respectively. When HRT was 9, 8, 7, and 6 h, the average effluent COD was less than 42 mg·L-1. The average effluent NH4+-N levels were 2.4, 2.8, 3.3, and 6.5 mg·L-1, respectively. The average effluent TP values were 0.3, 0.4, 0.7, and 0.8 mg·L-1, respectively. The ratio of the denitrifying phosphorus accumulation organisms (DPAOs/PAOs) in the system of anoxic zone was reduced from 76.8% to 48.8%. When HRT was 8 h, the ratio of denitrifying phosphorus to nitrogen (ΔPO43-/ΔNO3--N) was increased by 37.5% by a mathematical statistics method. The ΔPO43-/ΔNO3--N in the anoxic zone was 1.24 (the theoretical value is 1.41). At this time, the effect of denitrifying phosphorus to nitrogen was the best. The SVI value was lower than 100 mL·g-1 throughout the experiment, and the MLVSS/MLSS gradually decreased from 0.74 to 0.63, indicating that the sludge activity was reduced.

Soft - sensing modeling based on ABC - MLSSVM inversion for marine low - temperature alkaline protease MP fermentation process.

BACKGROUND: Aiming at the characteristics of nonlinear, multi-parameter, strong coupling and difficulty in direct on-line measurement of key biological parameters of marine low-temperature protease fermentation process, a soft-sensing modeling method based on artificial bee colony (ABC) and multiple least squares support vector machine (MLSSVM) inversion for marine protease fermentation process is proposed. METHODS: Firstly, based on the material balance and the characteristics of the fermentation process, the dynamic "grey box" model of the fed-batch fermentation process of marine protease is established. The inverse model is constructed by analyzing the inverse system existence and introducing the characteristic information of the fermentation process. Then, the inverse model is identified off-line using MLSSVM. Meanwhile, in order to reduce the model error, the ABC algorithm is used to correct the inverse model. Finally, the corrected inverse model is connected in series to the marine alkaline protease MP fermentation process to form a composite pseudo-linear system, thus, real-time on-line prediction of key biological parameters in fermentation process can be realized. RESULTS: Taking the alkaline protease MP fermentation process as an example, the simulation results demonstrate that the soft-sensing modeling method can solve the real-time prediction problem of key biological parameters in the fermentation process on-line, and has higher accuracy and generalization ability than the traditional soft-sensing method of support vector machine. CONCLUSIONS: The research provides a new method for soft-sensing modeling of key biological parameters in fermentation process, which can be extended to soft-sensing modeling of general nonlinear systems.

[Pollution Characteristics and Emission Coefficients for Volatile Organic Compounds from the Synthetic Leather Industry in Zhejiang Province].

Based on the survey of 175 synthetic leather enterprises in Zhejiang Province, China, in 2014, this paper analyzes the control of volatile organic compounds (VOCs) and, ultimately, screened 161 key enterprises for further research. The results showed that most enterprises take measures to control waste gas; however, there is a distinct problem with the efficiency of exhaust gas collection. The industry used Solvent-based materials. The main VOC pollutants were DMF, toluene, methyl acetate, acetone, ethylacetate, and butanone. The VOC emission coefficient of the synthetic leather industry in Zhejiang was 0.168 kg·m-2. The industry includes polyurethane and polyvinyl chloride processes, for which VOC emission coefficients were 0.170 kg·m-2 and 0.142 kg·m-2, respectively. In addition, the emission coefficient of polyurethane wet processes was 0.191 kg·m-2 and that of dry processes was 0.179 kg·m-2. The emission coefficient for VOCs in post-treatment processes was 0.120 kg·m-2.

[Short-cut Nitrification Start-up and Optimization of Operating Conditions Under Different Control Strategies].

Low C/N domestic sewage was treated in a SBR. With an operating temperature of (25±0.5)℃, NO2--N accumulation rates reached 96.79%, 98.80%, and 98.78% after 69, 63, and 58 cycles, respectively. In each case, alternating modes of hypoxia/aerobic (four times), aerobic/anoxic (five times), and aerobic/anoxic (four times) were applied, respectively, with an alternating time of 30 min. At the same temperature, when the aerobic/anoxic time ratios were 30 min:30 min, 40 min:20 min, and 30 min:60 min, and the single-cycle alternating times were 5, 3, and 5, respectively, stable NO2--N accumulation rates reached 98.81%, 97.71%, and 94.64% after 63, 73, and 78 cycles, respectively. The activity of AOB was 96.30, 99.27, and 102.26, respectively. Simultaneous nitrification and denitrification occurred under the three aerobic/anoxic time ratios. The total amounts of nitrogen removed by synchronous nitrification and denitrification were 29.89, 28.77, and 29.78 mg·L-1. When temperatures were adjusted to 18, 25, and 30℃, and when the aerobic/anoxic time ratio was 30 min:30 min, the NO2--N accumulation rates were 99.58%, 99.21%, and 95.93% after 90, 64, and 61 cycles, respectively. The activity of the sludge (f) peaked when after 64, 40, and 48 cycles, while the sludge-settling performance was good.

Synergistic effect from anaerobic co-digestion of food waste and Sophora flavescens residues at different co-substrate ratios.

When food waste (FW) undergoes anaerobic digestion, the hydrolysis rate is rapid, and thus causes system instability. Sophora flavescens residues (SFRs) are rich in complex hydrolysed substances, such as lignocellulosic material. When combined FW and SFRs can effectively improve the stability of digestion systems and increase biogas yields. In this work, batch anaerobic experiments were conducted at different co-substrate ratios to investigate the performance of co-digestion and the synergistic effect of FW and SFRs. The co-digestion of the two substrates exerted synergistic effects on biogas production and the highest synergy was 120.8%. After digestion, the ratio of hydrolysed chemical oxygen demand (COD) to the entire COD (RCODH) of the co-digestion group was 1.08 times that of the single FW group, which indicated the co-digestion promoted the hydrolysis of substrates. Moreover, the hydrolysis rate constant (kh) of co-digestion group increased by 4.10 times in comparison with that of the single FW group, which indicated the co-digestion increased the hydrolysis rate. In other words, the synergistic effect mainly occurred in the hydrolysis acidification process.

Valuation of Estimation Toxic Chemical Release Inventory Method-Focusing on Paint Manufacturing Process.

Industrial chemicals differ in their treatment methods and types, depending on their physicochemical properties. Highly volatile chemicals are emitted despite installation of preventive facilities, such as scrubbers and adsorption towers. Some countries release a Toxic Release Inventory (TRI), which is a mandatory report on the amount of chemicals emitted annually. This report is released to the citizens to ensure their right to knowledge and life. Numerous methods have been devised to investigate the amount of chemical emissions. There are four methods to estimate TRI emissions (Emission Factor Method; Material Balance Method; Source Testing Method; Emission Model Method). Moreover, efforts have been made to increase awareness and formulate plans to reduce chemical emissions. Despite this, the TRI method tends to underestimate and overestimate, especially due to volatile compounds. If the results of the TRI emissions are underestimated, toxic chemicals can have a negative impact on citizens. Volatile compounds are commonly used in chemical manufacturing plants, such as paint plants. In this study, a suitable method for each industrial process was suggested based on conservative estimates of multiple toxic chemical inventory method, focusing on the paint manufacturing process. In the paint manufacturing plant, storage, weighing, and mixing processes should be used emission model method to estimate TRI. In the reaction process, TRI must be estimated by the source test method. In the transfer process, the emission factor method should be used to estimate TRI. In the atmosphere prevention process, the emission factor method or source testing method should be used depending on the physical and chemical properties such as vapor pressure of the chemical.

[Mercury Distribution Characteristics and Its Mass Balance in a Multifunctional Urban Wetland].

The distribution characteristics and the source-sink relationship of total mercury (THg) and methyl mercury (MeHg) were studied in a wastewater treatment area and in a lake deep purification area of a multifunctional urban wetland that integrates domestic sewage treatment plant effluent, water purification, and leisure entertainment in Chongqing. The results showed that the THg concentration ranged from 1.98 ng·L-1 to 38.03 ng·L-1[average concentration was (9.10±5.84) ng·L-1] and MeHg concentration ranged from 0.09 ng·L-1 to 0.84 ng·L-1[average concentration was (0.34±0.08) ng·L-1] in an outlet of wastewater treatment area. In the deep purification zone, the THg concentration ranged from 0.37 ng·L-1 to 85.69 ng·L-1[average concentration of (6.76±2.29) ng·L-1] and the MeHg concentration ranged from 0.04 ng·L-1 to 1.47 ng·L-1[average concentration of (0.35±0.17) ng·L-1]. The interference of human activities on mercury concentration is prominent. The vertical distribution of THg in the water is consistent with that of MeHg, the surface layer has lower values than the deep layer. Material balance suggested that THg in the wetland system decreases by 155.50 g per year, and MeHg decreases by 1.65 g per year, which has a protective effect on the downstream water.

Characterizing sources and emissions of volatile organic compounds in a northern California residence using space- and time-resolved measurements.

We investigate source characteristics and emission dynamics of volatile organic compounds (VOCs) in a single-family house in California utilizing time- and space-resolved measurements. About 200 VOC signals, corresponding to more than 200 species, were measured during 8 weeks in summer and five in winter. Spatially resolved measurements, along with tracer data, reveal that VOCs in the living space were mainly emitted directly into that space, with minor contributions from the crawlspace, attic, or outdoors. Time-resolved measurements in the living space exhibited baseline levels far above outdoor levels for most VOCs; many compounds also displayed patterns of intermittent short-term enhancements (spikes) well above the indoor baseline. Compounds were categorized as "high-baseline" or "spike-dominated" based on indoor-to-outdoor concentration ratio and indoor mean-to-median ratio. Short-term spikes were associated with occupants and their activities, especially cooking. High-baseline compounds indicate continuous indoor emissions from building materials and furnishings. Indoor emission rates for high-baseline species, quantified with 2-hour resolution, exhibited strong temperature dependence and were affected by air-change rates. Decomposition of wooden building materials is suggested as a major source for acetic acid, formic acid, and methanol, which together accounted for ~75% of the total continuous indoor emissions of high-baseline species.

Alternating pure oxygen and air cycles for the biostabilization of unsorted fraction of municipal solid waste.

Biostabilisation is a process of treating the unsorted fraction of municipal solid waste (UFMSW) mechanically pre-treated. Although concepts such as circular economy would seem to limit biostabilization, several authors have recently described the advantages of biostabilization in regions where recycling systems are inadequate. In this perspective, the development of new MBT technologies is of considerable importance. The objective of the study was to evaluate the effects of the use of alternating air and oxygen cycles on the treated waste stability as well as on the quality of leachate and process gaseous emissions. Two Herhof biocells were prepared for this purpose. One implemented the conventional process and the other the "Air + O2" process. The biostabilization of the inlet UFMSW (3965 ±â€¯1965 mgO2/kgVS/h) resulted in a final product with a dynamic respirometric index almost equal in both processes. The mass balance indicated that of the 400 tons representing the input waste, 37.57% were biostabilized waste, 0.29% leachate and 62.14% CO2 and odours. However, the biostabilized waste was lower than that of the conventional process (equal to 40.18%). The Air + O2 system resulted in a shorter duration, increased production of leachate (although characterized by higher quality) and process gaseous emissions quality. The energy balance (20.3 kJ/kg per input waste) and cost analysis (80.0 €/ton per input waste) showed values equal or better to those of the conventional system. By contrast, weakness was in the O2 diffusion system. Although a life cycle analysis is necessary, the results highlighted the feasibility of the proposal especially for emergency situations.

A strategy for absolute quantitation of isomers using high performance liquid chromatography-ion mobility mass spectrometry and material balance principle.

Accurate characterization of isomers is a quite challenge and time-consuming work. A major bottleneck is the lack of relevant reference standards. In this work, we conducted a proof-of-concept study to develop a standard-free method for absolute quantitation of isomers by using high performance liquid chromatography-ion mobility mass spectrometry and material balance principle. The isomer structures were characterized by matching the rank order of experimental collision cross sections (CCSs) to that of theoretical CCSs. Then a time-dependent hydrolysis protocol derived from material balance equation was used for the calculation of the relative correction factor (F). Finally, the multi-level normalized matrix approach was developed to absolutely and precisely quantitate isomeric compounds. To assess this method, quercetin-liver microsome reaction pool was applied. With the developed method, four isomeric metabolites of quercetin were accurately analyzed, and metabolic profiling of quercetin isomeric metabolites was firstly reported with the absolute quantitation results. This is an accurate yet simple method for the absolute quantitation of positional isomers of interest.

[Pollution Characteristics and Emission Coefficient of Volatile Organic Compounds from Auto/motorcycle Parts & Accessories Manufacturing in Zhejiang Province].

The status of volatile organic compound (VOC) treatment in auto/motorcycle parts & accessories manufacturing in Zhejiang province was analyzed based on data from a survey investigating 70 concerned enterprises conducted in 2015. The pollution characteristics were further explored and the emission coefficient of VOCs released from this industry was preliminarily calculated by analyzing the survey data of 56 of the typical enterprises that had been screened further. The results showed that about two thirds of the enterprises had been equipped with collection and treatment facilities, but most of those facilities were running abnormally. Solvent-based materials were used commonly in this industry, and the main VOCs pollutants were xylene, butyl acetate, cyclohexanone, acetic ether, and toluene. The VOCs emission coefficient of auto/motorcycle parts & accessories manufacturing in Zhejiang was 414 g·(thousand yuan)-1, whereas the emission coefficient of the enterprises producing parts & accessories for only auto was 294 g·(thousand yuan)-1. As for the the enterprises producing parts & accessories for only motorcycle and for both auto and motorcycle, the emission coefficient reached 715 g·(thousand yuan)-1.

[Effect of Step Feed on Denitrifying Phosphorus and Nitrate Removal in a Modification of the Two Sludge A2/O-BAF System].

A modification of the two sludge A2/O-BAF system was used to treat low C/N real domestic sewage. In order to improve the utilization of the carbon source, the effects of two step feeds (pre-anoxic zone and anoxic zone) on denitrifying phosphorus and nitrate removal were studied. According to the formula of material balance for COD, the utilization of carbon source was analyzed and evaluated under different ratios of step feed, simultaneously. The results showed that when the ratio of step feed was 7:3 and the influent concentrations of COD, NH4+-N, TN, and TP were 174.99, 58.19, 59.10, and 5.15 mg·L-1, respectively, their effluent concentrations were 29.48, 4.07, 14.10, and 0.40 mg·L-1, and the removal rates were 82.12%, 92.76%, 75.45%, and 91.20%, respectively. It was found that when the ratio of the denitrifying phosphorus accumulation organisms to the phosphorus accumulation organisms(DPAOs/PAOs) was 98.81%, the efficiencies of denitrifying phosphorus and nitrate removal were optimum. By optimizing step feed, the carbon source was utilized effectively, and the efficiencies of nitrogen and phosphorus removal were improved simultaneously. The theoretical basis has thus been provided for the modification of the two sludge A2/O-BAF system to treat low C/N waste water.

Energy, environmental and operation aspects of a SRF-fired fluidized bed waste-to-energy plant.

A methodology based on the ISO 14031:2013 guideline has been developed and applied to a full-scale fluidized bed waste to energy plant (WtE) burning solid recovered fuel (SRF). With reference to 3years of operation, the data on energy and environmental performance, on raw materials consumptions such as sand and diesel fuel, accidental reasons of plant shutdown, have been acquired and analyzed. The obtained results have allowed to quantify the energy and environmental performance of the WtE plant under investigation by varying the amount and mixings of the inlet waste, available in form of thickened and fluff (similar to coriander) SRF. In terms of the energy performance, the fluidized bed technology applied to the SRF was able to guarantee an adequate production of electricity (satisfying the market demands), showing a relative flexibility with respect to the inlet waste. In terms of net energy production efficiency, the plant showed values in the range of 13.8-14.9% in line with similar installations. In terms of the environmental performance, the adoption of a cleaning system based on SNCR (Selective Non Catalitic Reduction)+semi-dry scrubbing+Fabric filter generated emissions usually well below the limits set by the EU Directive 2000/76/EC as well as the Italian Law 46/2014 (more restrictive) with reference to all the key parameters. In terms of the plant shutdown, the majority of problems focused on the combustion chamber and boiler due to the erosion of the refractory material of the furnace as well as to the breaking of the superheaters of the boiler. In contrast, the mechanical and electrical causes, along with those related to the control and instrumentation system, were of secondary importance. The sand bed de-fluidization was also among the leading causes of a frequent plant shutdown. In particular, results showed how although the SRF presents standard characteristics, the use of different mixtures may affect the number of plant shutdowns. The full-scale data highlighted how the lower the rate of fluff in the mixture was, the greater the number of plant shutdown due to sand bed de-fluidization was. Finally, the aspects in terms of the energy, environmental protection and raw material consumption have been discussed with reference to similar WtE plants such as Robbins (Chicago, USA), Lidköping (Sweden), Toshima (Tokyo, Japan), Madrid (Spain), Dundee (Scotland, UK) and Valene (Mantes la Jolie, France).

Energetic assessment of fixation of CO2 and subsequent biofuel production using B. cereus SM1 isolated from sewage treatment plant.

The ongoing work on global warming resulting from green house gases (GHGs) has led to explore the possibility of bacterial strains which can fix carbon dioxide (CO2) and can generate value-added products. The present work is an effort in this direction and has carried out an exhaustive batch experiments for the fixation of CO2 using B. Cereus SM1 isolated from sewage treatment plant (STP). The work has incorporated 5-day batch run for gaseous phase inlet CO2 concentration of 13 ± 1 % (%v/v). 84.6 (±5.76) % of CO2 removal was obtained in the gaseous phase at mentioned CO2 concentration (%v/v). Energetic requirement for CO2 fixation was assessed by varying Fe[II] ion concentration (0-200 ppm) on the per-day basis. The cell lysate obtained from CO2 fixation studies (Fe[II] ion = 100 ppm) was analyzed using Fourier transformation infrared spectroscopy (FTIR) and gas chromatography-mass spectroscopy (GC-MS). This analysis confirmed the presence of fatty acids and hydrocarbon as valuable products. The hydrocarbons were found in the range of C11-C22 which is equivalent to light oil. The obtained fatty acids were found in the range of C11-C19. The possibility of fatty acid conversion to biodiesel was explored by carrying out the transesterification reaction. The yield of biodiesel was obtained as 86.5 (±0.048) % under the transesterification reaction conditions. Results of this research work can provide the valuable information in the implementation of biomitigation of CO2 at real scenario.

[Pollution Characteristics and Emission Coefficient of Volatile Organic Compounds from Shoe-making Industry in Zhejiang Province].

To explore the pollution characteristics and emission coefficient of volatile organic compounds (VOCs) released from the shoe-making industry in Zhejiang province, this paper used the survey data of 490 shoe enterprises obtained in 2015 to analyze the current VOCs treatment status of shoe-making industry, and further screened 178 key enterprises to study the emission coefficient of shoe-making industry. The results showed that more than 95% of shoe enterprises failed to effectively dispose VOCs, because most shoe enterprises did not have treatment facilities. Moreover, solvent-based materials such as adhesive and primer were still commonly used in approximately 90% of shoe-making industry. Meanwhile, the main pollutants of VOCs in shoe-making industry were 2-butanone, toluene, acetone, cyclohexanone, ethyl acetate, xylene, dichloromethane and cyclohexane. Furthermore, the VOCs emission coefficient of shoe-making industry in Zhejiang was 29.5 g-1, while it was affected by the production processes, and the cemented construction techniques was higher than the injection techniques, which VOCs emission coefficients were 35.9 g-1 and 23.8 g-1, respectively. Furthermore, the major polluting stage of shoe-making industry was sole attaching, in which VOCs emission coefficient could reach 20.8 g-1.

[Pollution Characteristics and Emission Coefficient of Volatile Organic Compounds from Woodwork-making Industry in Zhejiang Province].

To explore the pollution characteristics and emission coefficient of volatile organic compound (VOCs) released from the woodwork-making industry in Zhejiang province, this paper used the survey data of 310 woodwork enterprises obtained in 2015 to analyze the current VOCs treatment status of woodwork-making industry, and further screened 213 key enterprises to study the emission coefficient of woodwork-making industry. The results showed that more than 94% of woodwork enterprises failed to effectively dispose VOCs since most woodwork enterprises did not have treatment facilities. Moreover, solvent-based materials such as adhesive and paint were still commonly used in woodwork-making industry. Meanwhile, the main pollutants of VOCs in woodwork-making industry were dimethyl benzene, butyl acetate, ethyl acetate, toluene and formaldehyde. Furthermore, the VOCs emission coefficient of woodwork-making industry in Zhejiang was 93.4 g·(million Yuan)-1, while it was affected by the production processes, and the VOCs emission coefficient of enterprises using the coating techniques was higher than that using the adhesive techniques, being 93.6 g·(million Yuan)-1 and 9.5 g·(million Yuan)-1, respectively. Furthermore, the major polluting stage of woodwork-making industry was coating stage, and the VOCs emission coefficient was 31.0 g·(million Yuan)-1 when waterborne and UV coating was used. The highest VOCs emission coefficient was from wooden furniture manufacturers, which could reach 168.5 g·(million Yuan)-1 when solvent-based coatings were used.