Coupled heat-activated persulfate - Electrolysis for the abatement of organic matter and total nitrogen from landfill leachate.
Waste Manag
; 97: 47-51, 2019 Sep.
Article
in En
| MEDLINE
| ID: mdl-31447026
ABSTRACT
This work analyzes the viability of a coupled heat-activated persulfate (PS) and electro-oxidation treatment toabatetheorganic matter and nitrogen from ahigh polluted landfill leachate (5500â¯mgâ¯L-1 TOC; 5849â¯mgâ¯L-1 TN, pH 8.4). These characteristics makes PS as a suitable oxidant to deal with the recalcitrant organic matter. Under the optimal conditions (70⯰C and 60% of the stoichiometric amount of PS), around 60% of the initial organic load was mineralized. On the contrary, the nitrogen removal was below 20%. A subsequent electrolytic stage using Ti/IrO2-TaO2 anode at 175â¯mAâ¯cm-2 and 0.42â¯M NaCl during 60â¯min, led to overall organic matter and nitrogen removal above 85% and 90%, respectively, with energy requirement of 38â¯kWh per kg of nitrogen removed. In this sense, the combined process achieves a significant reduction in terms of energy consumption, up to one fifth in relation to sole electrolysis. These results confirm the feasibility of this combined process to treat landfill leachate.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Water Pollutants, Chemical
Language:
En
Journal:
Waste Manag
Journal subject:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Year:
2019
Document type:
Article