竹丝填充床对高有机负荷及低C/N水质的脱氮特性

利用竹丝填料作为生物载体而组建的接触氧化工艺对高浓度难降解水质和低C/N水质的脱氮特性进行了研究.结果表明,当进水COD为804～5100mg/L,BOD为45.0～1100mg/L,BOD/COD为0.01～0.46的情况下,TN去除率为26.6%～96.95%,出水BOD/COD为0.07～0.75;当COD为98～251mg/L,TN为28.0～105.1mg/L,COD/TN为1.6～4.6时,TN去除率为4.94%～48.8%,说明竹丝填料接触氧化工艺在高浓度难降解水质和低C/N比水质条件下具有很好的脱氮效果,但竹子囊腔内的竹汁会使系统脱氮效果波动;对反应器内的主要菌群的分布特征研究发现,在处理高浓度难降解水质过程中,进、出口处细菌浓度相当;而在处理低C/N水质过程中,细菌、硝化细菌主要分布在反应器的进口处,反硝化细菌沿程均匀分布.

Nitrogen removal characteristics on contact oxidation techniques using filamentous bamboo as biofilm carrier for treatment of recalcitrant wastewater with high concentration and low C/N ratio

Recalcitrant wastewater with high concentration and low C/N ratio was treated for its nitrogen removal by contact oxidation technique, in which filamentous bamboo was used for biofilm carrier. Experimental results showed that total nitrogen removal percentage was 26.6%~96.95% when influent COD was 804~5100 mg/L and BOD 45.0~1100mg/L and the ratios of influent and effluent BOD/COD were respectively 0.01~0.46 and 0.07~0.75. Total nitrogen removal percentage was 4.94%~48.8% corresponding to COD of 98~251mg/L, TN of 28.0~105.1mg/L and COD/TN of 1.6~4.6. Above experimental results indicated that better denitrification results were achieved due to filamentous bamboo as a biological nitrogen removal system, which was suitable for treatment of recalcitrant wastewater with high concentration and low C/N ratio. Nitrogen removal fluctuated was due to secretion of bamboo juice secreted from the cavity of filamentous bamboo. The distribution characteristics of the main of bacteria was investigated to show that total number of bacteria at inlet and outlet were same roughly during the wastewater treatment, while bacteria, nitrifying bacteria were distributed in outlet, and nitrifying bacteria accounted for 1.57% of total bacteria, while denitrifying bacteria evenly distributed in the reactor.