Kwon Gyutae, Kang Jinyoung, Nam Ji-Hyun, Kim Young-O, Jahng Deokjin
a Department of Environmental Engineering and Energy , Myongji University , Yongin , Republic of Korea.
b Hyundai Engineering and Construction Co., Ltd. , Yongin , Republic of Korea.
Environ Technol. 2018 Apr;39(7):831-842. doi: 10.1080/09593330.2017.1312550. Epub 2017 Apr 18.
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 of total phosphorus and 7266.7 mg L of [Formula: see text]-P were extracted from SSA by using sulfuric acid at the HSO/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 (Mg):1.0 ([Formula: see text]-P):1.0 (NH-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.
猪场废水厌氧消化液（ADPW）含有高浓度的氨和磷，且摩尔比失衡。因此，即使通过鸟粪石沉淀完全去除磷后，氨仍处于较高水平。在本研究中，通过向ADPW中添加污水污泥灰（SSA）浸出液来回收氨和磷。结果表明，在H₂SO₄与SSA质量比为0.35的条件下，用硫酸从SSA中提取出11600 mg/L的总磷和7266.7 mg/L的[具体磷形态，原文公式部分缺失无法准确翻译]-P。ADPW与SSA浸出液按体积比1:1.29混合，然后以1.2（Mg）:1.0（[具体磷形态，原文公式部分缺失无法准确翻译]-P）:1.0（NH₃-N）的摩尔比形成鸟粪石。氨和磷的去除效率分别为91.95%和99.65%。通过各种方法对所得鸟粪石进行分析，发现除铜外，其符合韩国肥料标准。
