Shiota N, Akashi A, Hasegawa S
Shinko Pantec Co., Ltd., 1-4-78, Wakihama, Chuo-ku, Kobe 651-0072, Japan.
Water Sci Technol. 2002;45(12):127-34.
A novel wastewater treatment process (S-TE PROCESS) with significantly reduced production of excess sludge has been developed. The process consists of two different stages, one for a biological wastewater treatment and the other for a thermophilic aerobic digestion of the resulting sludge. A portion of return sludge from the wastewater treatment step is injected into a thermophilic aerobic sludge digester (TASD), in which the injected sludge is solubilized by the action of thermophilic aerobic bacteria. The solubilized sludge is returned to the aeration tank in the wastewater treatment step for its further degradation. Pilot-scale facilities of the S-TE process and the conventional activated sludge process as a control, both treating the same industrial wastewater, were comparatively operated for totally 270 days. As a result, 93% reduction in overall excess sludge production was achieved in the S-TE operation. The SS solubilization rate in TASD was stable at around 30%. Only a slight increase in the effluent SS and TOC concentrations was observed compared with those of the control facility. Otherwise the removal efficiency of TOC was approximately 95% for both plants. A full-scale plant treating domestic sewage was operated for three years, showing 75% reduction of overall excess sludge production. It was concluded that the new process was feasible.
一种能显著减少剩余污泥产量的新型废水处理工艺（S-TE工艺）已被开发出来。该工艺由两个不同阶段组成，一个用于生物废水处理，另一个用于对产生的污泥进行嗜热好氧消化。废水处理步骤中的一部分回流污泥被注入嗜热好氧污泥消化器（TASD），在其中注入的污泥通过嗜热好氧细菌的作用而溶解。溶解后的污泥被返回废水处理步骤中的曝气池进行进一步降解。S-TE工艺的中试规模设施和作为对照的传统活性污泥工艺设施，两者都处理相同的工业废水，进行了总共270天的对比运行。结果，在S-TE运行中，总剩余污泥产量减少了93%。TASD中的SS溶解率稳定在30%左右。与对照设施相比，仅观察到出水SS和TOC浓度略有增加。否则，两种装置对TOC的去除效率均约为95%。一座处理生活污水的全规模工厂运行了三年，总剩余污泥产量减少了75%。得出的结论是新工艺是可行的。
