XU Xiao-ming.Design of Expansion Project of a WWTP with Industrial Wastewater as the Main Feed Water[J].China Water & Wastewater,2021,37(4):71-75.
进水以高浓度工业废水为主的污水处理厂扩建工程设计
- Title:
- Design of Expansion Project of a WWTP with Industrial Wastewater as the Main Feed Water
- 摘要:
- 浙江某污水厂进水中含有70%的工业废水，具有有机物浓度高、冲击负荷大、乳化油浓度较高的水质特点，且出水水质要达到《城镇污水处理厂污染物排放标准》（GB 18918—2002）中一级A标准。已建一期工程(2×104 m3/d)采用AAO+高效沉淀池+滤布滤池工艺处理污水，出水有机物超标严重。为此，二期扩建工程(2×104 m3/d)采用调节池+混凝气浮组合池+A/O生化池+高效沉淀池的工艺流程。设计中增设调节池调节进水水质水量；采用混凝气浮组合池去除进水中的乳化油，以避免对后续工艺运行造成干扰；延长生化池停留时间，强化对有机物的去除，避免在深度处理阶段设置高级氧化工艺，节省建设、运行费用；气浮污泥采用离心脱水，生物污泥采用带式脱水机处理。工程试运行期间出水水质稳定达到设计标准，直接运行成本为0.56元/m3。
- Abstract:
- The influent of a wastewater treatment plant in Zhejiang Province contained 70% industrial wastewater with high concentration of organic matter and emulsified oil, as well as high impact load. However, the effluent should reach the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). AAO tank, high-efficiency sedimentation tank and cloth-media filter were used in the first-stage project(2×104 m3/d), which caused severe excess of effluent organic matter. Therefore, the regulating tank, coagulation/air floatation unit, A/O tank and high efficiency sedimentation tank were applied in the second-phase expansion project (2×104 m3/d). The design features were as follows: adjusting the quality and quantity of influent by adding a regulating tank; The coagulation/air floatation tank was used to remove the emulsified oil, so as to avoid the interference with the subsequent process operation; By extending the residence time of the biochemical tank, the removal of organic matter was strengthened, advanced oxidation process could be avoided in advanced treatment stage, which would save the costs of construction and operating. For air floatation sludge, centrifugal dewatering were selected, and belt filter dewatering were selected for the biochemical sludge. During the trial operation of the project, the effluent quality was stable and reached the design standard, and the direct operation cost was 0.56 yuan/m3.
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