Fractionating various nutrient ions for resource recovery from swine wastewater using simultaneous anionic and cationic selective-electrodialysis.

Different from current nutrient recovery technologies of recovering one or two nutrient components (PO or NH) from wastewater, this study aimed to fractionate various nutrient anions and cations simultaneously, including PO, SO, NH, K, Mg and Ca, into several streams. The recovered streams could be further paired together to produce high-value products. A novel electrodialysis process was developed by integrating monovalent selective anion and cation exchange membranes into an electrodialysis stack.

Fractionating magnesium ion from seawater for struvite recovery using electrodialysis with monovalent selective membranes.

As the consumption of global phosphorus reserves accelerates, recovering phosphorus as struvite (MgNHPO·6HO) from wastewater is an important option for phosphorus recycling. However, magnesium source is one of the major limiting factors for struvite recovery. In this work, different from previous studies where seawater was used directly as magnesium source in struvite precipitation, an electrodialysis stack equipped with monovalent selective cation-exchange membranes was designed to fractionate Mg from seawater for struvite recovery.

Effect of digestate disintegration on anaerobic digestion of organic waste.

Recently, digestate disintegration gained interest as an alternative strategy to feedstock pretreatment for anaerobic digestion. This study evaluated the effect of three different digestate disintegration methods (hydrogen peroxidation, ozone treatment and ultrasound) on manure digestate, potato waste digestate and mixed organic waste digestate. Lab-scale anaerobic digestion experiments were carried out by adding disintegrated digestate to the related substrate and inoculum with simulated recycle ratios of 0.

Desalination feasibility study of an industrial NaCl stream by bipolar membrane electrodialysis.

The industrial implementation of alternative technologies in the processing of saline effluent streams is a topic of growing importance. In this technical feasibility study, the desalination of an industrial saline stream containing about 75 g L(-1) NaCl contaminated with some organic matter using bipolar membrane electrodialysis (EDBM) was investigated on lab-scale. Bipolar membranes of two different manufacturers (PCA - PolymerChemie Altmeier GmbH and FuMA-Tech GmbH) were tested and compared in terms of electrical resistance, current efficiency and purity of the produced acid and base stream.

RO concentrate minimization by electrodialysis: techno-economic analysis and environmental concerns.

This paper presents a systematic techno-economical analysis and an environmental impact evaluation of a reverse osmosis (RO) concentrate treatment process using electrodialysis (ED) in view of environmental management of brine discharges. The concentrate originates from a secondary effluent treated by RO. Without any treatment, the concentrate would have to be discharged; this is compared in this study to the costs and benefits of an effective treatment method in a pilot scale ED plant.