title: Pilot-scale test of an advanced, integrated wastewater treatment process with sludge reduction, inorganic solids separation, phosphorus recovery, and enhanced nutrient removal (SIPER).
abstract: Sludge reduction technologies are increasingly important in wastewater treatment, but have some defects. In order to remedy them, a novel, integrated process including sludge reduction, inorganic solids separation, phosphorus recovery, and enhanced nutrient removal was developed. The pilot-scale system was operated steadily at a treatment scale of 10 m(3)/d for 90 days. The results showed excellent nutrient removal, with average removal efficiencies for NH4(+)-N, TN, TP, and COD reaching 98.2 ± 1.34%, 75.5 ± 3.46%, 95.3 ± 1.65%, and 92.7 ± 2.49%, respectively. The ratio of mixed liquor volatile suspended solids (MLVSS) to mixed liquor suspended solids (MLSS) in the system gradually increased, from 0.33 to 0.52. The process effectively prevented the accumulation of inert or inorganic solids in activated sludge. Phosphorus was recovered as a crystalline product with aluminum ion from wastewater. The observed sludge yield Yobs of the system was 0.103 gVSS/g COD, demonstrating that the system's sludge reduction potential is excellent.
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Yan
authors.forename: Fangying
authors.initials: F
authors.lastname: Ji
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Jianping
authors.initials: J
authors.lastname: Fan
authors.forename: Wei
authors.initials: W
authors.lastname: Guan
authors.forename: Qingkong
authors.initials: Q
authors.lastname: Chen
mesh_terms: D057919:Biological Oxygen Demand Analysis; D010084:Oxidation-Reduction; D010758:Phosphorus / Q000302:isolation & purification*; D010865:Pilot Projects; D012722:Sewage; D062065:Wastewater; D018508:Water Purification / Q000379:methods*
chemical_list: D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: Enhanced nutrient removal; Inorganic solids separation; Phosphorus recovery; Side-stream system; Sludge reduction