ABSTRACT

Tofu is widely processed in East and Southeast Asian countries. During the production, highly polluted wastewater is discharged. This wastewater is commonly treated using a high-rate anaerobic wastewater treatment process; however, several organic compounds and nitrogen remain in the anaerobic effluent. The aim of this study was to develop a combined upflow anaerobic sludge blanket (UASB) and downflow hanging sponge (DHS) biosystem that that serves as a post-treatment for an expanded granular sludge blanket reactor used for treating tofu-processing wastewater in Japan for 699 days. The UASB reactor played a role in treating of COD, with 58 ± 16% and 74 ± 20% of total COD and soluble COD removed anaerobically. Besides, methane was recovered from removed soluble COD were 63 ± 28% and 87 ± 64% at winter and summer. Meanwhile, the DHS reactor showed its potential in treatment of BOD and TSS. The final effluents were recorded as 67 ± 38 mg L⁻¹, 50 ± 26 mg L⁻¹, and 22 ± 16 mg L⁻¹ of total COD, BOD and total suspended solids, respectively. This indicates that the proposed UASB-DHS system has proven its suitability as post-treatment system for anaerobically treated tofu-processing wastewater.

 抽象的

豆腐在东亚和东南亚国家广泛加工。生产过程中排放污染严重的废水。这种废水通常采用高效厌氧废水处理工艺进行处理；然而，厌氧废水中仍残留有几种有机化合物和氮。本研究的目的是开发一种组合式上流式厌氧污泥床 (UASB) 和下流式悬挂海绵 (DHS) 生物系统，作为日本用于处理豆腐加工废水的膨胀颗粒污泥床反应器的后处理。 699天。 UASB反应器对COD起到了一定的处理作用，厌氧去除了总COD和可溶性COD的58±16%和74±20%。此外，冬季和夏季去除的可溶性COD中甲烷的回收率分别为63±28%和87±64%。同时，DHS反应器在处理BOD和TSS方面显示出了其潜力。最终流出物的总COD、BOD和总悬浮固体分别为67 ± 38 mg L ^-1 、50 ± 26 mg L ^-1和22 ± 16 mg L ^-1 。这表明所提出的UASB-DHS系统已证明其适合作为厌氧处理的豆腐加工废水的后处理系统。