降解生物质气化洗焦废水微生物的选择

MICROBIAL SELECTION FOR DECOMPOSING TAR-WASHED WASTEWATER DISCHARGED FROM THE PROCESS OF BIOMASS GASIFICATION

选用首都师范大学生物系保存的菌种 ,采用单一菌种和混合菌种对生物质气化洗焦废水进行生物降解 ,选择有较好降解生物质气化焦废水能力的微生物。当洗焦废水含量为 10 0mL/L时 ,单一菌种和混合菌种可使洗焦废水中的COD去除率分别达到 5 8.3%和 81.4 %。混合菌种对洗焦废水的降解率明显高于单一菌种。当洗焦废水含量分别为 15 0mL/L ,2 0 0mL/L和 30 0mL/L时 ,混合菌种S4对洗焦废水的COD去除率分别是 6 3.6 % ,5 6 .7%和 5 1.2 % ,随着洗焦废水含量增加 ,微生物对其降解速度减慢 ,降解率降低。洗焦废水含量在 10 0mL/L以下时 。

Single cultures and co-cultures preserved in the lab of Capital Normal University were utilized to treat tar-washed wastewater in order to select the microorganisms which have a high ability to degrade tar-washed wastewater discharged from the process of biomass gasification. When tar-washed wastewater concentration is 100 mL/L, the COD removal rate reaches 58.3% and 81.4% by single cultures and co-cultures respectively, and the degradation rate of co-cultures is obviously higher than that of single cultures. When tar-washed wastewater concentration is increased to 150 mL/L, 200 mL/L and 300 mL/L, the COD removal rate is 63.6%, 56.7% and 51.2% with co-cultures respectively. The degradation rate decreases with the increase of tar-washed wastewater concoentration, and the ideal treatment efficiency can be obtained by co-cultures with the tar-washed wastewater concentration less than 100 mL/L.