Publicaties
Characterization of Microbial Degradation Products of Steviol Glycosides KU Leuven
Steviol glycosides were subjected to bacteria present in a soil sample collected from a Stevia plantation in Paraguay. During the incubation experiments, next to the aglycon steviol, steviol degradation products were also formed. X-ray analysis and NMR methods in combination with chemical synthesis and GIAO NMR calculations were used to fully characterize the structure of these compounds as a tricyclic ketone and the corresponding reduced form. ...
Pilot scale anion selectrodialysis for water reclamation and nutrient recovery from UASB effluent after nitrification, ultrafiltration and UV C treatment KU Leuven
In the frame of the increasing need of nutrient recovery and recycling the objective was to fractionate and concentrate nutrients from nitrified, ultra-filtered and ultraviolet C treated UASB effluent with anion selectrodialysis (aSED). Under these conditions it was possible to keep the system in operation for 14 days or even for 3 weeks with intermittent cleaning in place every week. When membranes developed in the frame of sulphuric acid ...
Optimization of the configuration of the anion Selectrodialysis Stack for Fractionation of Phosphate from UASB effluent in Batch Mode on Lab Scale and Pilot Scale. KU Leuven
In anion selectrodialysis (aSED) multivalent anions are entrapped in the so called “product stream” between a standard anion exchange membrane (SA membrane) and a monovalent anion selective membrane (MVA membrane). This study was carried out on nitrified and ultra-filtrated effluent of an upflow anaerobic sludge blanket reactor (UASB) of a potato processor. The selectivity for phosphate of various membranes that could act as SA membranes was ...
Phosphorous recovery as calcium phosphate from UASB effluent after nitrification with or without subsequent denitrification KU Leuven
Wastewater of potato processors contains high amounts of phosphorus and its recovery as calcium phosphate (CP) is investigated. In contrast to struvite, CP can be cotreated with phosphorous ore in phosphoric acid production, as far as it does not contain too much magnesium phosphate. The precipitation of CP was studied from the effluent of an upstream anaerobic sludge blanket reactor (UASB) after lab scale nitrification or lab scale ...
Phophorus reclamation by end-of-pipe recovery as calcium phosphate from effluent of wastewater treatment plants of agroindustry KU Leuven
Phosphorus is essential for live and must be recovered from all possible secondary resources. One of these secondary resourcesmaybetheeffluentofawastewatertreatmentplantinwhichnoobviousmeasuresaretaken to remove or recover the phosphorus. Effluent water of the wastewater treatment facility of a potato processor was spiked with 40–50 mg phosphate-P.L−1 to simulate such a water that can be subjected to an end-of-pipe recovery of phosphate. Simulations ...
Fractionating various nutrient ions for resource recovery from swine wastewater using simultaneous anionic and cationic selective-electrodialysis KU Leuven
Different from current nutrient recovery technologies of recovering one or two nutrient components (PO43- or NH4+) from wastewater, this study aimed to fractionate various nutrient anions and cations simultaneously, including PO43-, SO42-, NH4+, K+, Mg2+ and Ca2+, 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 ...
Cationic selectrodialysis for magnesium recovery from seawater on lab and pilot scale KU Leuven
In view of its multiple applications the selective recovery of Mg2+ from seawater can be very interesting. For this purpose, cationic selectrodialysis (cSED), which uses a conventional electrodialysis stack that is supplementary equipped with monovalent selective cation-exchange membranes, was used. Initially, various parameters were investigated on lab scale using synthetic seawater. The results pointed out that a lower current density resulted ...
The inhibitory effect of inorganic carbon on phosphate recovery from upflow anaerobic sludge blanket reactor (UASB) effluent as calcium phosphate KU Leuven
After treatment of the wastewater from the potato processing industry in an upflow anaerobic sludge blanket reactor (UASB) the effluent is rich in phosphate and dissolved inorganic carbon (IC). Increasing the pH of the UASB effluent with NaOH to precipitate phosphate as calcium phosphate leads to contamination with magnesium phosphate. Increasing the pH with Ca(OH)2 had a positive effect on phosphate precipitation, but after increasing the pH ...