Microalgae production in olive mill wastewater fractions and cattle digestate slurry: Bioremediation effects and suitability for energy and feed uses.

The possibility of obtaining energy or nutritive streams and bioremediation as an add-on opens new perspectives for the massive culturing of microalgal biomass on waste waters generated by the agro-food sector. Ordinary revenue streams are fully preserved, or even boosted, if they are used in microalgal cultivation; however, the suitability of wastewaters depends on multiple nutritional and toxic factors. Here, the effect of modulating the Olive Mill Wastewater (OMW) and cattle digestate (CD) fraction in the formulation of a growth medium on biomass accumulation and productivity of selected biomass fractions and their relevance for biofuel and/or feed production were tested for the microalga Scenedesmus dimorphus and for the cyanobacterium Arthrospira platensis (Spirulina). Tests highlighted the strong S. dimorphus adaptability to digestate, as on OMW, compared to A. platensis, with the maximum lipid storage (48 %) when culture medium was composed by 50 % of cattle digestate.

A standardized system for assessment and delivery of nutrition support in a large teaching hospital.

The nutrition support service (NSS) is consulted to evaluate and provide nutrition support to 500 patients per year. To facilitate this process, three forms--a consultation request form and preprinted parenteral and enteral nutrition order forms are used. The NSS Consult Request form was developed to provide consistency in medical, dietetic, nursing, and pharmacy patient assessments. This form is organized so that it includes clinical information necessary for nutrition assessment. Specifically, the NSS completes a nutrition assessment that includes a diet history; indirect calorimetry, only when indicated; a laboratory (metabolic) assessment; a clinical impression used to put the above-mentioned information into a nutrition perspective; and recommendations for either enteral or parenteral therapy. The recommendation for implementing nutrition support as either total enteral nutrition or total parenteral nutrition is made by using the respective order forms for enteral or parenteral nutrition. These include orders for specific formulas and additives and orders for laboratory monitors, nursing care, and criteria for notification of the physician. These forms facilitate the accurate transcription, preparation, and delivery of NSS orders by pharmacy, dietetics, and nursing departments. This approach provides an excellent framework in which to teach dietitians, pharmacists, nurses, and physicians a method for the delivery of appropriate nutrition support and provides a database for the performance of quality assurance analysis and clinical research.

Microalgal biomass production by using ultra- and nanofiltration membrane fractions of olive mill wastewater.

Olive milling produces huge amounts of wastewater (OMWW) characterized by an extremely high organic load. Its polyphenols content is a hindrance to conventional biological treatment and to using it as growing medium for common microbial biomasses. The practice to dump it on soil is in conflict with the latest EU directives about waste management. OMWW can be effectively and efficiently treated by means of membrane technology to a fraction of the initial volume, but membrane processing concentrates still require treatment. Reversing the overall cost balance of membrane processing and subsequent treatment requires valorizing the concentrates through their reuse, as well as ensuring long-term service of the membrane system through effective wastewater pretreatment and sustainable, fouling-controlling, membrane operation conduite. Aim of this work is to reuse and valorize the ultra- and nanofiltration membrane concentrates as media for biomass production of microalgae and cyanobacteria. Scenedesmus dimorphus and Arthrospira platensis, usable as a food, feed, nutraceutical component or feedstock for biofuels, were selected for this investigation. Microalgal growth was experimentally determined and related to the composition of the concentrate-based media and to the irradiance distribution within the photobioreactor volume to decouple light limitation and medium chemical composition effects.