CUITian-huai,CHENGJun,YANGKun.Design of a Wastewater Treatment Plant Expanded and Reconstructed from CASS Process to Bardenpho Process without Shutdown[J].China Water & Wastewater,2023,39(12):85-89.
污水厂CASS工艺改为Bardenpho工艺不停水扩容改造
- Title:
- Design of a Wastewater Treatment Plant Expanded and Reconstructed from CASS Process to Bardenpho Process without Shutdown
- 关键词:
- CASS工艺; Bardenpho工艺; 扩容改造
- 摘要:
- 汉江流域是南水北调中线工程的重要水源涵养区，随着汉江流域水污染防治的不断推进和污水管网的不断完善，陕西省某县城污水处理厂逐渐超负荷运行，出水水质不能稳定达标，亟需扩容改造。在用地受限且要求不停水建设的情况下，该扩容改造工程将CASS工艺原位改造为五段式Bardenpho工艺，并提出了不停水改造的技术路线。通过扩容改造，污水处理规模从1×104 m3/d提升到2.3×104 m3/d，实际平均出水COD、NH4+-N、TN较CASS工艺分别降低28.4%、76.4%和29.2%，碳源和除磷药剂投加量分别减少40%和60%左右，出水水质全面达到并优于一级A排放标准。污水处理总成本约1.48元/m3，经营成本0.87元/m3。该工程改造方案最大限度地利用了原有CASS池土建设施，有效节省了投资和运营费用，具有较好的经济技术优势。
- Abstract:
- Hanjiang River basin is an important water conservation area for the middle route project of South-to-North Water Diversion Project. With the continuous promotion of water pollution prevention and control in the basin and the continuous improvement of sewage network, the operation of a county wastewater treatment plant in Shaanxi Province is overloaded, and the effluent quality cannot meet the discharge standards stably. Therefore, the wastewater treatment plant is in urgent need of expansion and reconstruction. In the case of land limitation and continuous operation requirement, the CASS process was transformed into a five-stage Bardenpho process in situ in the expansion and reconstruction project, and the technical route of transformation without shutdown was proposed. The scale of the wastewater treatment plant was increased from 1×104 m3/d to 2.3×104 m3/d after expansion. Compared with CASS process, the average COD, NH4+-N and TN in effluent were reduced by 28.4%, 76.4% and 29.2%, respectively, and the dosages of carbon source and phosphorus removal agent were reduced by approximately 40% and 60%, respectively. The effluent quality reached and was better than the first level A limit specified in the discharge standard. The total cost of sewage treatment was approximately 1.48 yuan/m3, the operating cost was 0.87 yuan/m3. The project made full use of the original civil construction facilities of CASS tank, effectively saved the investment and operating cost, and showed good economic and technological advantages.
相似文献/References:
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