LINGWei-wei,MAShun-jun,TANGYu-lin.Design and Application of the pH Adjustment and Aluminum Control System by Gas/Liquid Carbon Dioxide[J].China Water & Wastewater,2024,40(6):91-96.
“气/液”二氧化碳调pH控铝系统设计及应用
- Title:
- Design and Application of the pH Adjustment and Aluminum Control System by Gas/Liquid Carbon Dioxide
- Keywords:
- waterworks; carbon dioxide; poly aluminum chloride
- 摘要:
- 针对饮用水厂原水藻类繁殖、pH升高的问题，在上海惠南水厂开展了“气/液”二氧化碳调pH控铝系统设计及工程应用，采用原水pH、流量前馈及沉淀进水pH和砂滤池出水铝反馈相结合的控制模式，优化设计在线pH、铝离子检测仪表选型及安装方式，实现了二氧化碳调pH在线精准控制。根据2022年1月—8月的运行结果，与采用聚合氯化铝混凝剂调pH控铝方式相比，二氧化碳预处理调pH控铝可实现精准运行，较2021年同期出厂水铝浓度降低31%，混凝剂用量减少35%，混凝剂与二氧化碳药剂成本减少19%，净水污泥产量减少27%，该成果可为二氧化碳预处理在市政供水行业推广应用提供技术支撑。
- Abstract:
- Aiming at the issue of pH increase in raw water caused by algal proliferation in waterworks, the design and engineering application of gas/liquid carbon dioxide (CO2) injection system was carried out in Huinan waterworks of Shanghai. The control mode combining feedforward control of raw water pH and flow rate with the feedback control of precipitation influent pH and sand filter effluent aluminum concentration is adopted to optimize the selection and installation of online pH and aluminum ion detection instruments, enabling precise online control of pH adjustment by CO2 injection. Based on the operational results from January to August 2022, the use of CO2 pre-treatment for pH adjustment and aluminum control achieved precise operation compared to the conventional method of pH adjustment using PAC. The aluminum concentration in the treated water decreased by 31% compared with the same period in 2021, while the dosage of coagulants decreased by 35%. The cost of coagulants and CO2 agents decreased by 19%, and the production of sludge from the water treatment process decreased by 27%. The results can provide technical support for the widespread application of CO2 pre-treatment in the municipal water supply industry.
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