Velho V F, Andreottola G, Foladori P, Costa R H R
Catarinense Federal Institute of Education, Science and Technology, Camboriú-SC, Brazil E-mail:
Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano, 77, 38123 Trento, Italy.
Water Sci Technol. 2019 Mar;79(6):1081-1091. doi: 10.2166/wst.2019.104.
A full-scale anaerobic side-stream reactor (ASSR) for sludge reduction was monitored in terms of sludge production and compared with the previous conventional activated sludge configuration (CAS). A detailed solid mass balance was calculated on the whole full-scale plant to estimate the sludge reduction associated with the ASSR. The activity of the biomass, which undergoes alternation of aerobic and anaerobic conditions, was investigated by the respirometric test. The ASSR promoted a reduction of heterotrophic biomass activity and the substrate consumption rate in the activated sludge implemented with ASSR (AS + ASSR) was 36% smaller than in the CAS period. The solid mass balance indicated a sludge reduction of 28%. During the 270-day operation, the observed sludge yield passed from 0.438 kgTSS/kgCOD in the CAS to 0.315 in the AS + ASSR configuration. The solubilization of chemical oxygen demand (COD), NH -N and orthophosphate were verified under anaerobic conditions. The results suggest that the possible mechanisms of sludge reduction were the increase of the system sludge retention time (SRT) by ASSR addition, and the reduction in heterotrophic biomass activity added to the organic compounds' hydrolysis.
对一座用于污泥减量的全尺寸厌氧侧流反应器（ASSR）进行了污泥产量监测，并与之前的传统活性污泥配置（CAS）进行了比较。在整个全尺寸工厂上计算了详细的固体质量平衡，以估算与ASSR相关的污泥减量。通过呼吸测定试验研究了经历好氧和厌氧条件交替的生物质的活性。ASSR促进了异养生物质活性的降低，采用ASSR的活性污泥（AS + ASSR）中的底物消耗率比CAS时期小36%。固体质量平衡表明污泥减量为28%。在270天的运行期间，观察到的污泥产率从CAS中的0.438 kgTSS/kgCOD降至AS + ASSR配置中的0.315。在厌氧条件下验证了化学需氧量（COD）、氨氮和正磷酸盐的溶解情况。结果表明，污泥减量的可能机制是通过添加ASSR增加了系统污泥停留时间（SRT），以及添加到有机化合物水解中的异养生物质活性降低。
