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| The removal effect of ex-situ combined ecological remediation technology on different forms of nitrogen in Jiulong River tributary |
| Received:September 18, 2022 Revised:March 08, 2023 |
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| KeyWord:ex-situ ecological combined remediation technology;different forms of nitrogen;removal effect;environmental factors |
| Author Name | Affiliation | E-mail | | LIU Jie | Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China | | | FANG Hongda | College of Harbour and Coastal Engineering, Jimei University, Xiamen 361021, China | hongdafang@126.com | | LI Jianjie | Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China | | | LIU Wanxin | ZKTH Environmental Technology Co., Ltd., Xiamen 361021, China | | | HE Junming | Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China | | | LIN Jiahui | Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China | | | LAN Weibin | ZKTH Environmental Technology Co., Ltd., Xiamen 361021, China | | | GUO Peiyong | Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China | |
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| Abstract: |
| The study aims to identify the effects and mechanisms of removing different forms of nitrogen from the water, the influence of exsitu ecological combined remediation technologies on nitrogen concentrations in water, and the correlation between different nitrogen forms and environmental factors. The results discussed in this paper are based on a project involving an ex-situ combined remediation system for contaminated water in Pulin Creek, a tributary of the Jiulong River. The results demonstrated that the average removal rate of NH4+-N by ex-situ ecological combined remediation technology was 88.03%, which was significantly higher than that of other forms of nitrogen(P＜0.05); the removal effect of total nitrogen(TN) and dissolved total nitrogen(DTN)in water is noticeable, with average removal rates of 73.35% and 77.67%, respectively. The NH4+-N removal rate of the sludge-membrane symbiotic high-efficiency coagulation water purification system has a specific removal, and the NH4+-N concentration in the effluent is 7.72 mg·L-1. In Ecological pond 1, the NH4+-N has the best and most stable removal treatment. The NH4+-N removal rate of Ecological pond 1 is 63.55%, and the content of NH4+-N in the effluent is 2.19 mg·L-1. The NO3--N, NO2--N and NH4+-N concentration in the effluent of the Ecological pond 2 are 0.99, 0.73 mg·L-1 and 0.58 mg·L-1, respectively. Ecological pond 3 had the best removal effect for NO3--N, with a content of NO3--N in the effluent of 0.64 mg·L-1. Among all the ex-situ ecological remediation treatment units, the main form of nitrogen in water is dissolved inorganic nitrogen(DIN). The proportion of NH4+-N in DIN is highest in the sludge-membrane symbiotic high-efficiency coagulation water purification system, Ecological pond 1, and Ecological pond 3, at 62.51%, 37.02%, and 37.88%, respectively. In Ecological pond 2, NO3--N accounts for the highest proportion of DIN(45.23%). In various ecological combination remediation treatment units, different forms of nitrogen are associated with environmental factors(DO, temperature, pH, and turbidity). The study discovered that ex-situ ecological combined remediation technology mainly removes different forms of nitrogen through suspended sludge filtration and sedimentation technology, microbial nitrification and denitrification, absorption of submersed macrophytes, and plant synergy and has a good remediation effect on polluted water. |
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