CASS工艺处理规模扩容改造.docVIP

CASS工艺处理规模扩容实例研究 陈国猛1，何家明2，李志荣2，李华1，刘子正1，王宗平＊1 （1.华中科技大学 环境科学与工程学院，湖北 武汉 430074；2.小榄水务 有限公司，广东 中山 528415） 摘要：介绍了中山小榄污水处理厂CASS工艺的运行情况，结合该厂实际运行状况开展了污水厂挖潜扩容的生产性试验研究。结果表明：CASS池运行优化后，能够实现每两格同步运行，日处理规模从11.2万吨提升至15.8万吨，出水能够满足一级B排放标准和广东省地方标准；在该工况下进一步增加污泥回流，强化除磷使其降到0.5mg/l以下，出水达到一级A排放标准。扩容后日处理电费总成本22120元，单位处理电费成本0.1036元/吨，总成本虽然较扩容前增加，但吨处理电费较扩容前降低0.074元/吨。 关键词：CASS工艺 扩容 除磷 Study on the Case of Scale Expansion of CASS Process Chen Guo-meng1，He Jia-ming2，2,Li Hua1,Liu Zi-zheng1,Wang Zong-ping1 （1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074,China;2.Xiaolan Water Co., Ltd., Zhongshan 528415, China） Abstract: Cyclic Activated Sludge System (CASS) was applied to treat municipal wastewater from xiaolan wastewater treatment plant. The full-experiment on scale expansion was carried out.?The results show that: The CASS reactor achieves synchronous operation of every two cells, and the treatment scale increases from 112,000 tons to 158,000 tons of wastewater per day, which can reach the first-B grade standard of GB18918-2002 with local standard of Guangdong Province. And in this case further sludge return is applied. This strengthened the removal rate of phosphorus, making it lower than 0.5mg /l which can meet the first-A grade standard of GB18918-2002. The daily total cost of electricity after expansion made up to 22,120 yuan, representing an increase of 5,320 yuan before the expansion. The per-unit cost of electricity was 0.1036 yuan / ton, 0.074 yuan /ton lower than the previous situation. Keywords: CASS Process; Treatment scale Expansion; phosphorus removal CASS工艺是SBR处理工艺变型的一种。高效率的CASS活性污泥污水处理工艺，有着众多的优点，比如占地小、预处理要求低且污泥回流量小[1,2]、较低的运行成本、脱氮除磷效果显著和耐冲击负荷强[3]等，被国内外广泛应用。该工艺还有一个很明显的优点，即可以根据要求改变进/出水的方式调整工况，得到较好的处理效果。中山市小榄污水处理厂目前建设两期CASS池，均以SBR方式运行，目前已超负荷运行，但仍不能满足实际原水进水量的要求，因此急需提出解决方案。 工程概况 中山市小榄污水处理厂处理污水为城市生活污水，现已建成两期，每期设计规模为5X104m3/d。该镇排水收集系统为合流制，主体构筑物生物池为CASS池，同时满足旱季和雨季设计负荷，因此池体相对较大。该工程设计出水水质达到《城镇污水处理厂污染物排放标准》(GB18918—200