Chauzy J, Graja S, Gerardin F, Crétenot D, Patria L, Fernandes P
Anjou Recherche, Chemin de la Digue, 78603 Maisons Laffitte, France.
Water Sci Technol. 2005;52(10-11):255-63.
In many cases, reducing sludge production could be the solution for wastewater treatment plants (WWTP) that here difficulty evacuating the residuals of wastewater treatment. The aim of this study was to test the possibility of minimising the excess sludge production by coupling a thermal hydrolysis stage and an anaerobic digestion with a very short HRT. The tests were carried out on a 2,500 p.e. pilot plant installed on a recycling loop between the clarifier and the actived sludge basin. The line equipped with the full scale pilot plant produced 38% TSS less than the control line during a 10 week period. Moreover, the rapid anaerobic digestion removed, on average, more than 50% of the total COD load with a hydraulic retention time (HRT) of 3 days. Lastly, the dryness of the remaining excess sludge, sanitised by the thermal hydrolysis, was more than 35% with an industrial centrifuge. This combination of thermal hydrolysis and rapid anaerobic digestion equally permits a significant gain of compactness compared to traditional anaerobic digesters.
在许多情况下，对于那些在排放废水处理残余物方面存在困难的污水处理厂（WWTP）而言，减少污泥产量可能是解决办法。本研究的目的是测试通过将热水解阶段与极短水力停留时间（HRT）的厌氧消化相结合来使剩余污泥产量最小化的可能性。试验在一个安装在澄清池和活性污泥池之间循环回路上的2500人口当量的中试装置上进行。配备全尺寸中试装置的生产线在10周期间产生的总悬浮固体（TSS）比对照生产线少38%。此外，快速厌氧消化在3天的水力停留时间（HRT）下平均去除了超过50%的总化学需氧量（COD）负荷。最后，通过热水解进行消毒处理后，用工业离心机处理剩余的剩余污泥，其干度超过35%。与传统厌氧消化池相比，这种热水解和快速厌氧消化的组合同样能显著提高紧凑性。
