title: Recovery of ammonia through struvite production using anaerobic digestate of piggery wastewater and leachate of sewage sludge ash.
abstract: Anaerobic digestate of piggery wastewater (ADPW) contains high concentrations of ammonia and phosphorus with unbalanced molar ratio. Thus, ammonia remains at a high level even after phosphorus is completely removed through struvite formation. In this study, both ammonia and phosphorus were recovered by adding leachate of sewage sludge ash (SSA) into ADPW. It was demonstrated that 11,600 mg L-1of total phosphorus and 7266.7 mg L-1of [Formula: see text]-P were extracted from SSA by using sulfuric acid at the H2SO4/SSA mass ratio of 0.35. ADPW and the leachate of SSA were mixed at the volumetric ratio of 1:1.29, and then struvite was formed at the molar ratio of 1.2 (Mg2+):1.0 ([Formula: see text]-P):1.0 (NH3-N). Removal efficiencies of ammonia and phosphorus were 91.95% and 99.65%, respectively. The obtained struvite was analyzed by various methods and was found to meet the Korean fertilizer standards, except for copper.
authors.affiliation: a Department of Environmental Engineering and Energy , Myongji University , Yongin , Republic of Korea.
authors.forename: Gyutae
authors.identifier: http://orcid.org/0000-0003-1474-5487
authors.initials: G
authors.lastname: Kwon
authors.affiliation: a Department of Environmental Engineering and Energy , Myongji University , Yongin , Republic of Korea.
authors.forename: Jinyoung
authors.identifier: http://orcid.org/0000-0003-3265-7712
authors.initials: J
authors.lastname: Kang
authors.affiliation: a Department of Environmental Engineering and Energy , Myongji University , Yongin , Republic of Korea.
authors.forename: Ji-Hyun
authors.identifier: http://orcid.org/0000-0001-7623-5015
authors.initials: JH
authors.lastname: Nam
authors.affiliation: b Hyundai Engineering and Construction Co., Ltd. , Yongin , Republic of Korea.
authors.forename: Young-O
authors.identifier: http://orcid.org/0000-0001-6379-0597
authors.initials: YO
authors.lastname: Kim
authors.affiliation: a Department of Environmental Engineering and Energy , Myongji University , Yongin , Republic of Korea.
authors.forename: Deokjin
authors.initials: D
authors.lastname: Jahng
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D010710:Phosphates; D010758:Phosphorus; D012722:Sewage; D000069877:Struvite / Q000737:chemistry*; D062065:Wastewater
chemical_list: D000641:Ammonia; D010710:Phosphates; D010758:Phosphorus; D012722:Sewage; D000069877:Struvite; D062065:Wastewater
keywords: Struvite; extraction; fertilizer; recovery nitrogen; sewage sludge ash