Mou Rui, Shen Zhi-Qiang, Zhou Yue-Xi, Chen Xue-Min, Fu Xiao-Yong, Tan Lei-Lei, Qu Wei
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2016 Sep 8;37(9):3508-3517. doi: 10.13227/j.hjkx.2016.09.032.
The anaerobically digested effluent of the dispersed swine wastewater was treated by a three-stage bio-zeolite constructed wetland, and the performance of the wetland, the variation of pollutants concentration in effluent and ORP distribution in the bio-zeolite layer were studied. The results showed that COD, N and P in the digested effluent could be efficiently removed by the wetland, and the wetland also had resistance to ammonia impact load. When the hydraulic loading rate was 0.047 m·(m·d), COD, NH-N and TN (the average mass concentrations in inflow were 477.7, 155.3 and 176.4 mg·L) were mainly removed in the district 1 of the wetland, and the average removal rates were 80.6%, 55.3% and 58.1%, respectively. There was obvious enhancement of nitrification in the bio-zeolite, and the major nitrification product was nitrate. The mass concentrations of NO-N in the district 1, district 2 and district 3 of the wetland were 85.85, 91.06 and 82.41 mg·L, respectively. The nitrate produced in bio-zeolite layer of the district 1 could be denitrified by microorganisms in the slag brick layer using the residual organic substances in water as the substrate. TP was mainly removed by adsorption in the slag brick layer, and the role of microbe assimilation was relatively small. The reaeration of the bio-zeolite layer in the three-stage wetland was good. Most of the ORP values remained over 400 mV in the bio-zeolite layer.
采用三级生物沸石人工湿地处理分散式猪场废水厌氧消化液，研究了湿地的处理效果、出水污染物浓度变化及生物沸石层的氧化还原电位（ORP）分布。结果表明，该湿地对消化液中的化学需氧量（COD）、氮、磷具有良好的去除效果，且对氨氮冲击负荷具有一定的抗性。当水力负荷为0.047 m·（m²·d）时，进水COD、氨氮（NH₃-N）和总氮（TN）平均质量浓度分别为477.7、155.3和176.4 mg·L，主要在湿地第1区去除，平均去除率分别为80.6%、55.3%和58.1%。生物沸石中硝化作用明显增强，主要硝化产物为硝酸盐。湿地第1区、第2区和第3区的硝酸氮（NO₃-N）质量浓度分别为85.85、91.06和82.41 mg·L。第1区生物沸石层产生的硝酸盐可被渣砖层中的微生物利用水中残留有机物作为底物进行反硝化。总磷（TP）主要在渣砖层通过吸附去除，微生物同化作用相对较小。三级湿地生物沸石层复氧良好，生物沸石层大部分ORP值保持在400 mV以上。
