文献类型：期刊文献

英文题名：Optimal regulation of N/P in horizontal sub-surface flow constructed wetland through quantitative phosphorus removal by steel slag fed

作者：Chen, Xiurong[1,2];Sun, Xiaoli[1,2];Xu, Peng[1,2];Wang, Shanshan[1,2];Zhou, Tianjun[1,2];Wang, Xiaoxiao[1,2];Yang, Chenchen[1,2];Lu, Quanling[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, NELHROWTT, Shanghai 200237, Peoples R China

年份：2020

卷号：27

期号：6

起止页码：5779

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;EI(收录号：20242716625407);WOS:【SCI-EXPANDED(收录号:WOS:000519635800011)】；

基金：This research was supported by the National Key Research and Development Program of China (2017YFB0602804), the Major Projects of Science and Technology (No. 2014ZX07202-011) in China, the National Natural Science Foundation (No. 51878278), the Shanghai Pujiang Programme (No. 13PJD009), and the Fundamental Research Funds for the Central Universities (222201817009).

语种：英文

外文关键词：Municipal secondary effluent; Constructedwetland; N/P; Steel slag; Quantitative dephosphorization

摘要：High concentration of nitrogen and phosphorus and imbalance of N/P can lead to the formation of water and the malignant proliferation of toxic microalgae. This study put forward the advanced nutrient removal with the regulation of effluent N/P as the core in order to restrain the eutrophication and growth of poisonous algae. According to the preliminary study and review, the optimal N/P for non-toxic green algae was 50:1. The horizontal sub-surface flow constructed wetland was filled with steel slag and ceramsite to achieve the regulation of effluent N/P. The results showed that steel slag had the stable P removal capacity when treating synthetic solution with low P concentration and the average removal rate for 1.5, 1.0, and 0.5 mg/L synthetic P solution was 2.98 +/- 0.20 mg kg(-1)/h, 2.26 +/- 0.15 mg kg(-1)/h, and 1.11 +/- 0.10 mg kg(-1)/h, respectively. Combined with P removal rate and P removal task, the filling amount of steel slag along the SSFCW(sub-surface flow constructed wetland) was 3.22 kg, 4.24 kg, and 4.31 kg. In order to ensure the stability of dephosphorization of steel slag, the regeneration of P removal capacity was investigated by switching operation of two parallel SSFCW in 20 days for cycle. The N removal was limited for the deficiency of carbon source (COD (chemical oxygen demand)/TN = 3-4), and was stable at 18.5-31.9% which was less affected by temperature. Therefore, by controlling the process of quantitative P removal of steel slag, the effluent N/P in SSFCWcan be stable at 40-60:1 in the whole year, so as to inhibit the malignant proliferation of toxic algae.