降解五氯酚的微氧磁性活性污泥理化特性的研究

Study on Physicochemical Characteristics of Micro-aerobic Magnetic Activated Sludge for PCP Degradation

中文关键词:  五氯酚  微氧  活性污泥  磁粉  理化特性

Key Words:PCP  micro-aerobic  activated sludge  magnetic particle  physicochemical characteristics

中文摘要:

      以厌氧污泥为种泥，在微磁场、低溶解氧条件下，梯度式加入五氯酚（PCP）驯化污泥，并以不加磁粉的反应器作为对照，考察驯化过程微氧磁性活性污泥的污泥浓度（MLSS）、污泥体积指数（SVI值）及絮凝性能。在整个驯化过程中，有磁粉反应器中微氧活性污泥紧实，絮体较大，MLSS高于无磁粉反应器的，在PCP浓度低于20 mg/L时，SVI值始终保持在45~55 mL/g，沉降性能良好；而无磁粉反应器中污泥松散，SVI值较高。对污泥胞外多聚物（ECPs）总量、蛋白质与多糖比值的测定结果表明，磁粉的加入大大提高了污泥的絮凝性能。

Abstract:

      Using anaerobic sludge as seed sludge, the MLSS, SVI and flocculation performance of the micro-aerobic magnetic activated sludge were studied during domestication process. The activated sludge was cultured by adding PCP gradiently under the condition of magnetic field and less dissolved oxygen. It was found that micro-aerobic activated sludge was in a tight state with larger flocculation and MLSS was higher than the reactor without magnetic particle. Besides, the sludge had better settling performance with the SVI value remaining in the 45～55 mL/g when PCP concentration was lower than 20 mg/L. On the contrary, the sludge was loose and SVI value was high in the reactor without magnetic particle. The measurement results of total amount of extracellular polymeric substances (ECPs) and PN/PS, indicated that the addition of magnetic powder greatly improved the flocculation performance of the sludge.