好氧颗粒污泥对不同底物组成的响应

The response of aerobic granular sludge to different substrate compositions

在序批式间歇反应器(R1、R2和R3)中,采用乙酸钠(R1)、蔗糖(R2)和苯酚(R3)三种不同基质作为碳源,均成功地培养出了好氧颗粒污泥;考察了不同颗粒污泥的理化性质及其对污染物的转化能力。结果表明,R1中颗粒污泥外观呈黄色,其主要的微生物菌群为细菌;R2中颗粒污泥外观呈黑色,内部含有丝状菌;而R3中颗粒污泥表面被大量丝状菌包裹,颗粒污泥呈淡黄色。在进水COD1000mg/L时R1、R2和R3中颗粒污泥比有机物的利用速率大小顺序为R3>R1>R2,而COD的去除率顺序却为R2>R1>R3。在进水氨氮40mg/L时,R1、R2和R3中氨氮的去除率分别在91%、96%和80%以上。以不同的底物培养出不同的好氧颗粒污泥可以拓展其在有毒化学物质如酚类化合物和高浓度工业废水生物处理中的应用。

Aerobic granular sludge was successfully cultivated in three sequencing batch reactors （R1, R2and R3 ） fed with three different carbon sources like sucrose, acetate and phenol. The characteristics and conversion ability for pollutants of aerobic granular sludge were investigated. The results showed that aerobic granular sludge in R1 exhibited yellow and was mostly composed of bacteria. The filamentous microbes existed in aerobic granular sludge with black in R：. However, aerobic granular sludge with light yellow had many filamentous microbes on its outer surface. In influent COD of 1000 mg/L, the specific organic compound utilization rate in R1, R2and R3 followed the order of R3 〉 R1 〉 R2 , whereas the order of COD removal efficiency was R3 〉 R1 〉 R2. In influent NH4^＋ -N of 40 mg/L, the NH4＋ -N removal efficiency in R1 , R2and R3 reached above 91% , 96% and 80% , respectively. The different aerobic granules produced by different sobstrates could expand the granule-based applications in biological treatment of toxic chemicals such as phenolic compounds and high-concentration industrial wastewaters.