摘要
为适应国家对地表水环境日益严格的要求,需要构建强化硝化区人工湿地对分散养猪废水进行强化脱氮处理。以砾石、砖渣、沸石和石灰石混合物、细砂为基质制作人工湿地反应器(2 m×1 m×0.75 m)。在进水COD、氨氮(NH_(3)-N)和总磷(TP)质量浓度分别为150、110和25 mg/L条件下,考察了反应器启动阶段性能;在启动完成后将进水COD质量浓度提高到200 mg/L,考察COD负荷的影响;将NH_(3)-N质量浓度提高到200 mg/L,考察NH_(3)-N负荷的影响;分析反应器中氮的去除途径。结果表明:接种挂膜阶段,沸石可以达到吸附-再生平衡,反应器运行性能稳定,启动末期反应器吸附NH3-N的质量浓度约为45 mg/L,产生的硝酸盐氮(NO_(3)-N)质量浓度约为60 mg/L;提高进水COD质量浓度,COD去除率保持在77.50%左右,提高进水NH_(3)-N质量浓度,NH3-N质量浓度未出现明显升高,稳定在30 mg/L左右。研究显示,构建的人工湿地运行稳定,深度脱氮效果良好,可用于实际推广运用。
To adapt to the increasingly stringent requirements for surface water environment,it is necessary to construct the artificial wetland of strengthened nitrification area for treating the dispersed swine wastewater for strengthened denitrification.The constructed wetland reactor(2 m×1 m×0.75 m)was prepared with gravel,brick debris,mixture of zeolite and limestone and fine sand as the substrate.The start-up phase performance of the reactor was evaluated under the conditions of COD,ammonia nitrogen,and total phosphorus concentration in influent of 150,110 and 25 mg/L,respectively.After completion of start-up,COD concentration in influent was increased to 200 mg/L to examine the effect of COD load.In comparison,ammonia nitrogen concentration in influent was increased to 200 mg/L to evaluate the effect of ammonia nitrogen load.The nitrogen removal pathways in the reactor were analyzed.The results showed that during the inoculation stage,zeolite achieved adsorption-regeneration equilibrium,and the operational performance of the reactor was stable.At the end of the reactor,the adsorption concentration of ammonia nitrogen was approximately 45 mg/L,and the concentration of nitrate nitrogen produced was approximately 60 mg/L.When COD concentration in influent was increased,the removal rate of COD was kept at about 77.50%,and ammonia nitrogen concentration in influent was increased,but ammonia nitrogen concentration did not increase obviously,it was stable at about 30mg/L.The results showed that the constructed wetland had stable operation and good effect of deep nitrogen removal,which could be used for practical application.
作者
李彩霞
马文明
左艳兵
沈志强
宋爱红
LI Caixia;MA Wenming;ZUO Yanbing;SHEN Zhiqiang;SONG Aihong(Hunan Meteorological Service Center,Changsha 410118,China;China Construction Eco-environmental Group CO.,Led,Beijing 100037,China;Hunan Safety and Technology Co.,Led,Changsha 410000,China;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Institute of Environmental Science and Engineering,Chang'an University,Xi’an 710054,China)
出处
《环境保护科学》
CAS
2024年第5期106-112,共7页
Environmental Protection Science
基金
中央财政科技计划结余经费专项(2021-JY-32)
国家水体污染控制与治理科技重大专项(2017ZX07402002)。
关键词
人工湿地
分散养猪废水
沸石
动态再生
硝化/反硝化
artificial wetland
dispersed swine wastewater
zeolite
dynamic regeneration
nitrification-denitrification
