The effect of Sulfate on batch anaerobic/aerobic biological treatment

• Main Authors: Jsung-an He, 何宗安
• Other Authors: Wei-Chin Chang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/14055835860707942994

碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 91 === Enhanced Biological Phosphorous Removal (EBPR) process was introduced into a standard activated sludge process for the purpose of phosphate removal and bulking prevention effect. In some laboratory scale EBPR reactors, deterioration of EBPR and appear filamentous bulking has been reported due to unknown reasons, one of reasons is when influent contain sulfate (municipal wastewater usually 20~50mg/L of sulfate is contained), sulfate reducing bacteria can use sulfate as electron acceptor and competition substrate with phosphate accumulation organisms. Filamentous sulfur bacteria could utilize sulfide for the energy source, and cause of growth of the filamentous bacteria. Therefore, this experiment cultivate PAO sludge for sequenceing batch reactor style, and separate into four reactors, then not increase and increase sulfate in substrate. The study investigated sulfate affect on the performance of anaerobic/aerobic phosphate release/uptake, and identification filamentous. The results revealed that all reactors performance anaerobic/aerobic release/uptake, and performance the great phosphate removal ratio in Run 1 period. The sludge flocs were great, and filamentous index was 2, in this study, we classified this filamentous bacteria as Type 1701. In Run 2, anaerobic tank was not sulfate reducing；aerobic tank was not sulfide oxidation. Anaerobic release phosphate and phosphate removal does not affect due to contain sulfate in influent, aerobic setting characteristic still were better. In Run 3, anaerobic tank was not sulfate reducing；aerobic tank was not sulfide oxidation. But anaerobic release phosphate and phosphate removal ratio were poor due to influent shock loading. For Run 1、Run 2 and Run 3 P release/C uptake, this three period were the same, and did not much change due to contain different sulfate concentration. Therefore, sulfate reducing bacteria did not grow predominantly.