The effect of vacuum degassing of activated sludge on biological wastewater treatment over a total period of 4 years was examined. In half of the period studied, the treatment system was classic, where wastewater, after a biological reactor with nitrification-denitrification and biological dephosphatation, was directed to secondary settlers. In the second period, the treatment system was modified so that the sludge from the biological reactor was directed to the vacuum degasser, followed by the secondary settling tanks (vacuum degassing activated sludge system; VDAS). As a result of using the VDAS, a significant improvement in sludge settling ability was recorded, which allowed the plant operators to increase the amount of biomass in the biological reactor. Differences in the quantity and quality of the wastewater influent were found during both periods. However, the quality of treated wastewater and the efficiencies of nutrient removal and removal rates were usually better in the system with vacuum degassing. An improvement was achieved not only for the elimination of the different forms of nitrogen, which by definition were to be removed as ammonia and gaseous nitrogen, but also for organic compounds expressed as COD and phosphorus. As a result of the lower sludge loading, sludge production expressed in g SS per g COD removed was significantly lower (20 %) with the VDAS.

考察了活性污泥的真空脱气对生物废水处理的总体影响，该过程历时4年。在研究的一半时间里，处理系统是经典的，其中废水经过经过硝化-反硝化和生物脱磷的生物反应器后，被引导至二级沉降器。在第二阶段中，对处理系统进行了改造，以将来自生物反应器的污泥引导至真空脱气机，再引导至第二个沉淀池（真空脱气活性污泥系统； VDAS）。使用VDAS的结果是，污泥沉降能力得到了显着提高，这使工厂运营商可以增加生物反应器中的生物量。在两个时期内，废水进水的数量和质量均存在差异。但是，在带真空脱气的系统中，处理后的废水的质量以及养分的去除效率和去除率通常更好。不仅消除了各种形式的氮（根据定义将其作为氨和气态氮除去），而且还改进了以COD和磷表示的有机化合物，从而实现了改善。由于较低的污泥负荷，VDAS产生的污泥产量以每g COD的g SS为单位显着降低（20％）。不仅消除了各种形式的氮（根据定义将其作为氨和气态氮除去），而且还改进了以COD和磷表示的有机化合物，从而实现了改善。由于较低的污泥负荷，VDAS产生的污泥产量以每g COD的g SS为单位显着降低（20％）。不仅消除了各种形式的氮（根据定义将其作为氨和气态氮除去），而且还改进了以COD和磷表示的有机化合物，从而实现了改善。由于较低的污泥负荷，VDAS产生的污泥产量以每g COD的g SS为单位显着降低（20％）。