title: Phosphorus extraction and sludge dissolution by acid and alkali treatments of polyaluminum chloride (PAC) treated wastewater sludge.
abstract: Phosphorus (P) leaching characteristics of polyaluminium chlorides (PAC) treated wastewater sludge was investigated by wet chemicals (acid and alkali). Sludge fractionation showed non-apatite inorganic P was the dominant P (90.9% of TP) while apatite P only accounted for 3.7%. After 2h extraction with 1N NaOH or 2N HCl, 80.5% and 77.9% of total P was leached, while sludge dissolution reached 72.7% and 75.6%, respectively. Kinetic study with HCl and NaOH showed that P release and sludge dissolution follow first order reaction with rate constants of 0.50 and 0.35min(-1) (P release) and 0.47×10(-2) and 0.15×10(-2)min(-1) (sludge dissolution), respectively. Sequential extraction by NaOH/HCl leached 91.7% of the total P. This study will help in understanding the P release behavior of the PAC treated wastewater sludge.
authors.affiliation: Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University, Chuncheon, Gangwon 200-702, Republic of Korea.
authors.forename: Toor Umair
authors.initials: TU
authors.lastname: Ali
authors.affiliation: Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University, Chuncheon, Gangwon 200-702, Republic of Korea. Electronic address: dongjin@hallym.ac.kr.
authors.forename: Dong-Jin
authors.initials: DJ
authors.lastname: Kim
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; C016213:aluminum oxychloride; D010758:Phosphorus; D000536:Aluminum Hydroxide
keywords: Phosphorus release; Polyaluminium chlorides; Sludge dissolution; Wet chemical