沈阳市某大型污水处理厂提标设计及经验总结

Upgrading Design and Experience Summary of a Large WWTP in Shenyang City

摘要:

沈阳市某污水处理厂现状规模达40万 m³/d，生物处理工艺采用二级曝气生物滤池，出水水质达到国家二级排放标准。为满足环境保护要求，该污水处理厂拟进行原址提标改造，将出水水质提高至一级A标准，同时，改造过程中须实现不停水施工。提标改造工程对现状生物滤池进行改造，建成三级生物滤池，深度处理工艺选用加砂高效沉淀池。项目采用分阶段实施方式，先期建设应急处理系统，保障总体工艺系统改造期间的进水处理，从而实现不停水施工。提标改造后，污水处理厂的出水水质能够稳定达标。项目总投资为64 727.29 万元，单位处理成本为1.64 元/m³，吨水用地指标为0.18 m²/（m³·d^-1）。

Abstract:

In Shenyang City, the current scale of a wastewater treatment plant (WWTP) is 400 000 m³/d, which adopts two-stages aerated bio-filter as biological treatment process, and its effluent quality meets the national secondary discharge standard. In order to meet the environmental protection requirements, it is proposed to carry out the upgrading and reconstruction at the original site to improve the effluent quality to the first-level A standard. At the same time, the construction must be carried out without water supply interruption during the reconstruction. In the upgrading and reconstruction project, the existing bio-filters are reconstructed to three-stages bio-filters, and the high efficiency settling tank with micro-sand is adopted as advanced treatment process. This project is implemented in stages. The emergency treatment system is built in advance to ensure the sewage treatment during the overall process system reconstruction so as to achieve the construction without water supply interruption. After the upgrading and reconstruction, the effluent quality of WWTP can meet the standard stably. The total investment of the project is 647.272 9 million yuan, the unit treating cost is 1.64 yuan/m³, and the land use index per ton of water is 0.18 m2/(m3·d?1).