工业水处理 ›› 2023, Vol. 43 ›› Issue (10): 142-149. doi: 10.19965/j.cnki.iwt.2022-1047

• 试验研究 • 上一篇    下一篇

生化法耦合臭氧氧化工艺深度处理污泥干化冷凝液

张驰1,2(), 叶壮1, 张雨婷1,3, 娄宝辉1,2, 冯向东1,3(), 张佳宁4   

  1. 1. 浙江浙能技术研究院有限公司, 浙江 杭州 311121
    2. 浙江大学化学系, 浙江 杭州 310027
    3. 浙江省火力发电高效节能与污染物控制技术研究重点实验室, 浙江 杭州 311121
    4. 浙江浙能长兴发电有限公司, 浙江 湖州 313100
  • 收稿日期:2023-07-19 出版日期:2023-10-20 发布日期:2023-10-18
  • 作者简介:

    张驰(1992— ),博士。E-mail:

    冯向东,高级工程师。E-mail:

  • 基金资助:
    中国博士后基金项目(2022M712738)

Biochemical method coupled with ozonation process for advanced treatment of sludge drying condensate

Chi ZHANG1,2(), Zhuang YE1, Yuting ZHANG1,3, Baohui LOU1,2, Xiangdong FENG1,3(), Jianing ZHANG4   

  1. 1. Zhejiang Energy R&D Institute,Hangzhou 311121,China
    2. Department of Chemistry,Zhejiang University,Hangzhou 310027,China
    3. Key Research Laboratory of High Efficiency Energy Saving and Pollutant Control Technology in Thermal Power Generation of Zhejiang Province,Hangzhou 311121,China
    4. Zhejiang Zheneng Changxing Power Generation Co. ,Ltd. ,Huzhou 313100,China
  • Received:2023-07-19 Online:2023-10-20 Published:2023-10-18

摘要:

针对污泥干化冷凝液这类高氨氮、高油分工业废水,设计了一套“隔油-气浮-A2O-MBR-臭氧催化氧化”联用工艺对其进行深度处理。常规工况下COD、TN、NH3-N和TP的去除率均能达到99%以上,但TN与NH3-N指标仍然超出地表Ⅲ类水标准。针对A2O模块的进水流量、回流比进行调控,建立多模块组合工艺的Optimal(custom) Design模型,模拟理论出水TN与NH3-N低于1.0 mg/L的工况,并通过14 d连续稳定运行验证了出水TN与NH3-N最低工况的合理性。对冷凝液处理过程中油分的沿程分布进行了探索,其中物理隔油对油分的去除率为84.42%,剩余油分由A2O+MBR的生物消耗与污泥吸附去除。分离获得的油分热值为37.26 MJ/kg,与煤按比例掺烧后可用于电厂发电,解决火电厂废油处置问题的同时又提高了燃煤放热量。

关键词: 污泥干化冷凝液, 深度处理, 物理隔油, 火电厂, 生物法, 臭氧氧化

Abstract:

Aiming at the industrial wastewater with high NH3-N and high oil content such as sludge drying condensate,a combined process of oil separation, air flotation, A2O, MBR and ozone catalytic oxidation was designed to carry out advanced treatment of the condensate. The removal rates of COD,TN,NH3-N and TP could all reach more than 99% under normal working conditions,but the TN and NH3-N indicators still exceeded the standard of surface Class Ⅲ water. The Optimal(custom) Design model of the multi-module combined process was established to adjust the influent flow rate and reflux ratio of the A2O module,and simulated the theoretical operating conditions that the effluent TN and NH3-N were lower than 1.0 mg/L. The rationality of the minimum operating conditions of effluent TN and NH3-N was verified through 14 days of continuous stable operation. The distribution of oil along the process of condensate treatment was explored. The oil removal rate of physical oil separation was 84.42%,and the remaining oil was removed by biological consumption and sludge adsorption of A2O+MBR. The calorific value of the oil obtained by separation was 37.26 MJ/kg,which could be used for power generation in power plants after being mixed with coal in proportion to solve the problem of waste oil disposal in thermal power plants and at the same time improve the heat release of coal combustion.

Key words: sludge drying condensate, advanced treatment, physical oil separation, thermal power plants, biochemical method, ozone oxidation

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