以PHBV为碳源和生物膜载体的生物反硝化研究

Biological denitrification using PHBV as carbon source and biofilm carrier

采用了一种可生物降解聚合物(BDP)聚羟基丁酸戊酸酯(PHBV)作为碳源和生物膜载体去除水体中的硝酸盐.结果表明:以PHBV为碳源和载体的反硝化系统启动时间短,硝酸盐氮(NO3--N)去除率高于93%;水力停留时间(HRT)对反硝化效果影响显著,但反硝化系统对进水硝酸盐氮负荷具有较好的抗冲击能力;出水DOC(溶解性有机碳)浓度低于27.5mg/L,表明PHBV具有一定的控释碳源的能力;反应器不同高度脱氮效果差异显著,反应器中层(10-15cm)处获得最大NO3--N去除率.

PHBV （poly-3-hydroxybutyrate-co-3-hydroxyvalerate） as a biodegradable polymer was used as carbon source and biofilm carrier to remove nitrate in water. A short start-up period was observed and nitrate-nitrogen （NO3--N） removal rates were greater than 93%. With a decrease of HRT from 1h to 0.5h, denitrification changed remarkably. The denitrification system was however found to be resistant to the shock load of influent NO3-N. The concentrations of effluent DOC （Dissolved Organic Carbon） were lower than 27.5mg/L, indicating that controlled carbonrelease was applicable to PHBV. Nitrate removal rates varied significantly with reactor height while the highest was obtained at the middle height layer （10-15cm）.