双污泥-诱导结晶工艺除磷脱氮试验研究

针对传统污水处理脱氮除磷工艺碳源不足、聚磷菌与硝化菌泥龄矛盾、磷资源无法有效回收利用等问题,开发出"双污泥-诱导结晶"新型工艺,对其去除有机物和脱氮除磷性能进行了考察和分析。结果表明:当进水COD为152～237mg.L-1,TP为3.92～7.68mg.L-1,TN为31.3～50.5mg.L-1,C/N比约为3.91～5.21时,COD、TN和TP平均去除率分别为93.2%、71.2%和95.7%。厌氧段COD去除量约占系统COD去除总量的85.9%。TN的去除主要由缺氧池承担,厌氧池、硝化池、缺氧池、后置曝气池TN去除量约占系统TN去除总量的31.7%、11.4%、54.9%和2.0%。结晶在除磷过程中起着主要作用,结晶除磷量平均约占总除磷量的81.5%。双污泥工艺在系统中的主要作用为辅助化学除磷和脱氮。侧流比是保证系统稳定运行的关键参数。后置曝气池对超越污泥中COD和氨氮的去除有重要作用。

Removal of organic substrates, phosphorus and nitrogen by two-sludge and induced crystallization process

A combined process of two-sludge and induced crystallization was proposed to solve some problems which exist in the traditional processes, such as lack of carbon source, SRT contradictions and low efficiencies for recovery and reuse of phosphorus.Its performance for the removal of organic substrates, phosphorus and nitrogen was investigated.The results showed that the average removal efficiencies of COD, TN, TP were 93.2%, 71.2% and 95.7%, when the concentrations of COD, TN, TP and C/N were 152—237 mg·L^-1, 3.92—7.68 mg·L^-1, 31.3—50.5 mg·L^-1 and 3.91—5.21, respectively.Among those, about 85.9% of the total COD removal was in anaerobic reactor.The share of TN removal in the anaerobic, aerobic, anoxic and post-aeration reactors was 31.7%, 11.4%, 54.9% and 2.0%, respectively, and the anoxic reactor took the most.The induced crystallization played a major role in removing phosphorus and took about 81.5% of the total removal.The main roles played by two-sludge process were denitrification and assist- chemical removal of phosphorus.Sidestream ratio was a key factor for the stable operation of two-sludge process.An important task of post-aeration reactor was to remove COD and ammonia nitrogen in bypass sludge.