文献类型：期刊文献

英文题名：Utilizing the supernatant of waste sulfuric acid after dolomite neutralization to recover nutrients from swine wastewater

作者：Xiao, Dean Huang, Haiming Zhang, Peng Gao, Zhiwei Zhao, Ning

第一作者：Xiao, Dean

通信作者：Huang, HM[1]

机构：[1]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550003, Guizhou, Peoples R China;[2]Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Peoples R China

第一机构：贵州理工学院资源与环境工程学院

通信机构：corresponding author), Yanshan Univ, Sch Environm & Chem Engn, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Peoples R China.

年份：2018

卷号：337

起止页码：265-274

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20180404664232);Scopus(收录号：2-s2.0-85040564259);WOS:【SCI-EXPANDED(收录号:WOS:000427616900027)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant No. 51408529) and China Postdoctoral Science Foundation Funded Project (Grant Nos. 2015M580215 and 2016T90215).

语种：英文

外文关键词：Swine wastewater; Dolomite; Combined treatment; Struvite crystallization

摘要：Cleaner production is an important concept and an urgent need for environmental protection. Toward reducing the consumption of chemicals for swine wastewater treatment by struvite crystallization, we proposed a novel combined treatment process wherein waste sulphuric acid and swine wastewater were treated together, with which the neutralization of the waste sulphuric acid solution by dolomite powder first, followed by the use of the resulting supernatant as the magnesium source of struvite crystallization in swine wastewater. Batch experiments revealed that the waste sulphuric acid solution could be well-neutralized by dolomite powder, such that the Mg2+ and Ca2+ concentrations of the resulting supernatant were approximately 5900 mg/L and 300 mg/L, respectively. Additionally, in the dolomite neutralization process, nearly half of Mn2+ in the waste sulphuric acid solution was removed. The experiments to investigate the effects of Mn2+ and Ca2+ on struvite crystallization revealed that the presence of Mn2+ and Ca2+ had a significant effect on struvite crystallization. The effective ratios of Mn2+ and Ca2+ on struvite crystallization were markedly influenced by the Mn2+/Ca2+: Mg2+ molar ratio, albeit negligibly by the solution pH. When the Mg-containing supernatant was fed to the swine wastewater for the struvite formation at different Mg:N:P molar ratio and at pH 9.5, Approximately 80% of the total ammonia nitrogen (TAN) and 97% of the phosphate (PO4-P) can be removed. A pilot-scale operation of the proposed coupling process indicated that an average of 83% of TAN and 95% of PO4-P could be stably removed from the swine wastewater, and the remaining Mn2+ concentration was controlled at around 1.2 mg/L. An economic analysis demonstrated that the proposed process could save 0.5$ of the total cost for treating swine wastewater (per m(3)) as compared to that of struvite crystallization using pure magnesium salts.