return sludge

Without building new biochemical reaction tank and adding new sludge return system, anoxic/ anaerobic/ aerobic zones are set up in the existing biochemical reaction tank by improving MLSS.

在没有新建生化反应池和增加回流系统的前提下，通过提高活性污泥浓度，在原生化反应池内进行了缺氧/厌氧/好氧功能区的分配，取得了良好的脱氮除磷效果。

The anaerobic stage has the effect to digest a part of wreckage of cells in return sludge, which can improve micro-environment of floc-forming bacteria, restrain overmuch growth of filamentous organisms and control sludge expanding.

厌氧阶段有分解生物残渣的功能，可改善菌胶团菌的微环境，从而抑制丝状菌的过剩生长，控制污泥膨胀。

Return sludge flowmeter is served as monitoring purposes . No control function is given.

污泥回流流量计,只作监测, 不参与控制.

The results showed that the denitrification capability of the BSAS process was better than SCAS process, due to enhancement of adsorbing measure, and let the return sludge mixed with raw wastewater under anaerobic condition for less than 30 min.

结果表明，后者具有更好的脱氮能力。BSAS工艺采用强化吸附手段让回流污泥与原水在缺氧条件下混合（30min），促进贮存物质的积累，加速内源反硝化作用。