LIJiao,GONGBen-zhou,ZHANGYing,et al.Performance of Two-stage Constructed Wetland for Advanced Nitrogen and Phosphorus Removal from Wastewater Treatment Plant Effluent[J].China Water & Wastewater,2023,39(11):75-81.
污水厂尾水复合型人工湿地深度脱氮除磷效能研究
- Title:
- Performance of Two-stage Constructed Wetland for Advanced Nitrogen and Phosphorus Removal from Wastewater Treatment Plant Effluent
- Keywords:
- constructed wetland; effluent from wastewater treatment plant; nitrogen and phosphorus removal; electrolysis; microalgae
- 摘要:
- 针对现有污水厂尾水人工湿地深度处理过程中存在的脱氮碳源缺乏和除磷效能较低的问题，构建规模为100 m3/d的基于轻质填料的人工湿地-电解、人工湿地-微藻耦合的污水厂尾水深度脱氮除磷中试系统，考察了电压、水力负荷对系统脱氮除磷效能的影响。结果表明：电压、水力负荷对系统的脱氮效能影响显著，而对除磷效能影响不显著。在温度为（20±4） ℃、电压为15 V、水力负荷为0.35 m3/（m2·d）、进水BOD5/TN为0.3~0.4的条件下，系统出水NH4+-N、TN和PO43--P浓度分别为0.93、1.50和0.04 mg/L，去除率分别为65.17%、87.91%和93.65%，达到地表水环境质量Ⅳ类标准；其中，一级、二级人工湿地对NH4+-N、TN和PO43--P去除的分担率分别为25.47%、63.17%、79.37%和39.70%、24.74%、14.28%。一级人工湿地-电解耦合系统在氮、磷去除过程中起主要作用，其中优势的反硝化功能菌属主要有Arenimonas、Hyphomicrobium、Rivibacter、Hydrogenophaga和Thauera。
- Abstract:
- In view of the shortage of carbon sources for denitrification and low phosphorus removal efficiency of constructed wetland for advanced treatment of effluent from the existing wastewater treatment plants, this paper established a pilot system with scale of 100 m3/d consisting of first-stage constructed wetland coupled with electrolysis and second-stage constructed wetland coupled with microalgae packing with lightweight media for advanced phosphorus and nitrogen removal from wastewater treatment plant, and investigated the effects of voltage and hydraulic load on phosphorus and nitrogen removal efficiency of the system. Voltage and hydraulic load had significant effects on the nitrogen removal efficiency of the system, but had no significant effects on the phosphorus removal efficiency. When the temperature, voltage, hydraulic load and BOD5/TN ratio were （20±4） ℃, 15 V, 0.35 m3/(m2·d) and 0.3-0.4, respectively, the NH4+-N, TN and PO43--P in effluent were 0.93 mg/L, 1.50 mg/L and 0.04 mg/L, respectively, and their removal rates were 65.17%, 87.91% and 93.65%, respectively, which met the class Ⅳ limit specified in surface water quality standard. Among them, the removal rates of NH4+-N, TN and PO43--P in the first-stage constructed wetland were 25.47%, 63.17% and 79.37%, respectively, while those in the second-stage constructed wetland were 39.70%, 24.74% and 14.28%, respectively. The first-stage constructed wetland coupled with electrolytic system played a major role in nitrogen and phosphorus removal, and the dominant denitrifying functional bacteria were Arenimonas, Hyphomicrobium, Rivibacter, Hydrogenophaga and Thauera.
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