人工土快滤滤床对耗氧有机污染物的去除机制

MECHANISM OF COD REMOVAL IN ARTIFICIAL RAPID INFILTRATION SYSTEM

通过对人工土快滤系统不同组分的灭菌试验和分析滤床落干恢复过程中土壤有机质的变化 ,对城市生活污水中的耗氧有机物 (COD)进入人工土滤床后的去向进行了研究。结果表明 ,人工土滤床对污水COD的去除是生物与非生物共同作用的结果 ,生物作用机制不仅表现在布水时期的生物降解 ,更反映在滤床落干期对被截留有机物的分解作用。系统好氧与厌氧微生物的周期监测表明 ,人工土滤床对污水COD的降解作用 ,不仅有污水微生物的生物降解 ,还有土壤微生物的矿化分解作用。

On an Artificial Soil Rapid Infiltration (ASRI) system, a new effective method for disposing domestic wastewater, mechanisms of COD removal in the system were studied. The result showed that COD removal in ASRI contributed to biodegradation and abiotic interception when wastewater was flooding the bed. Abiotic interception such as physical infiltration, adsorption and soil fixation intercepted and captured COD in the ASRI bed, in which the COD was decomposed when the water was drained. Periodic monitoring of organisms showed that both aerobe and anaerobe, which came from soil and sewage, played an important role in COD removal and aerobic biodegradation was the dominant action in the whole cycle of the ASRI system.\;