O/A两级生物砂滤工艺脱氮效果研究

污水中的氮元素是可供藻类利用的营养元素之一,但其含量过高时将会引起水体富营养化.采用O/A两级生物砂滤工艺处理城市污水厂二级出水,考察了水温、水力负荷和碳氮质量比对生物砂滤脱氮效果的影响.试验结果表明,生物砂滤池的反硝化性能随水温增加而提高,随水力负荷增加而下降,TN的平均去除率随碳氮质量比的增加逐渐提高.当水温在20...

Study on denitrification performance of O/A two-stage biological sand filter

As a nutrition element for algae′s growth,nitrogen can cause eutrophication when the concen-tration is too high.Using O/A two-stage biological sand filter to treat secondary effluent water from an urban sewage treatment plant,the influences of water temperature,hydraulic loading and mass ratio of carbon to nitrogen on the denitrification effect were investigated.The results of the test showed that,the denitrification performance of biological sand filter was improved with the increase of water temperature,and declined with the increase of hydraulic loading,the average removal rate of TN increased gradually with the increase of C/N mass ratio.When the water temperature was 20-26 ℃,the optimal control parameters of the test was determined as follows: the hydraulic loading was 3 m3/(m2·h),the mass ratio of carbon to nitrogen was 3.5 ∶ 1.Under the above condition,the average removal rate of TN reached above 44%,the mass concentration of TN in the effluent water was lower than 15 mg/L.It could be seen that,O/A two-stage biological sand filtration process could get a good denitrification effect,which was a technology for wastewater advanced treatment with a broad application prospect.