环境工程专业 外文翻译--啤酒废水处理(推荐).doc

英文原文 Sludge reduction during brewery wastewater treatment by hydrolyzation-food chain reactor system Abstract: During brewery wastewater treatment by a hydrolyzation-food chain reactor (FCR) system, sludge was recycled to the anaerobic segment. With the function of hydrolyzation acidification in the anaerobic segment and the processes of aerobic oxidation and antagonism, predation,interaction and symbiosis among microbes in multilevel oxidation segment, residual sludge could be reduced effectively. The 6-month dynamic experiments show that the average chemical oxygen demand (COD) removal ratio was 92.6% and average sludge production of the aerobic segment was 8.14%, with the COD of the influent at 960–1720 mg/L and hydraulic retention time (HRT) of 12 h.Since the produced sludge could be recycled and hydrolyzed in the anaerobic segment, no excess sludge was produced during the steady running for this system. Keywords hydrolyzation, multilevel oxidation, excesssludge, reduction Introduction During the 1980s, the main brewery wastewater treatment locally and abroad was the aerobic technique, then the hydrolytic-aerobic techniques showed up in the late 1980s. Currently, the main technology for brewery wastewater treatment are the activated sludge process, contact oxidation process, and hydrolytic-aerobic techniques. Although these techniques have some advantages of their own, they all have a problem with sludge disposal [1]. The sludge production is about 60% of the chemical oxygen demand (COD) removal amount for conventional activated sludge technology, and about 30% for conventional biofilm method [2]. The cost of sludge disposal had become an economic burden of the sewage plant. The sludge produced may bring about secondary pollution.Therefore, the study on water treatment processes that can lead to sludge reduction is becoming one of the important issues in sewage treatment. This study adopted principles of cleaner production. With the hydrolyzation-acidificatio