CAST工艺强化脱氮的设计改进

针对CAST工艺脱氮效率及同步硝化反硝化受碳源、生物絮体大小、溶解氧等因素的影响,以华北某污水处理厂为研究对象,结合污水处理厂运行现状,比较了CAST工艺强化脱氮等不同方案,提出了采用AO/SBR工艺作为该污水处理厂的升级改造工艺。运行结果表明,出水水质可以达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级B标准。

Improved design of strengthen denitrification of CAST process

In view of the fact that, the denitrification efficiency and simultaneous nitrification and denitrifi-cation of CAST process are affected by carbon source, bioflocs size, dissolved oxygen and some other factors, with a sewage treatment plant in north China as the research object, according to its operation status, different strengthened denitrification schemes of CAST process were compared, AO/SBR was proposed to be the process for the said plant's upgrading and reconstruction. The running results showed that, the effluent water quality met the requirement of level B grade 1 in GB 18918—2002 Discharge Standard of Pollutants for Municipal Wastewa-te r Tre atme nt Plant.