title: Decentralized two-stage sewage treatment by chemical-biological flocculation combined with microalgae biofilm for nutrient immobilization in a roof installed parallel plate reactor.
abstract: In this lab-scale study, domestic wastewater is subjected to a chemical biological adsorption (A-stage), followed by treatment in an innovative roof installed parallel plate microalgae biofilm reactor for nutrient immobilization (I-stage). The A-stage process was operated at a hydraulic retention time (HRT) of 1h and a solid retention time of 1day (FeSO(4) as flocculant). The I-stage, which consequently received the effluent of the A-stage process, was operated at an HRT of 1day and exposed to natural light. The overall system removed on average 74% of the total chemical oxygen demand, 82% of the total suspended solids, 67% of the total nitrogen and 96% of the total phosphorous in the wastewater. The design involves a relatively low capital and operating cost which is in the order of 0.5€/m(3) wastewater treated. These aspects suggest that the A/I process can be used as a decentralized domestic wastewater treatment system.
authors.affiliation: Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium.
authors.forename: Carlos
authors.initials: C
authors.lastname: Zamalloa
authors.forename: Nico
authors.initials: N
authors.lastname: Boon
authors.forename: Willy
authors.initials: W
authors.lastname: Verstraete
mesh_terms: D000327:Adsorption; D018441:Biofilms; D019149:Bioreactors; D005427:Flocculation; D058086:Microalgae / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D010788:Photosynthesis; D012722:Sewage; D013696:Temperature; D062065:Wastewater / Q000032:analysis; D018508:Water Purification / Q000191:economics / Q000295:instrumentation* / Q000379:methods
chemical_list: D012722:Sewage; D062065:Wastewater