干湿比对砂土地下渗滤系统净化能力的影响
doi: 10.13205/j.hjgc.201501013
THE FEASIBILITY STUDY OF SIMULTANCEOUS REMOVAL OF NITRATE AND ATRAZINE BY SOLID-PHASE AEROBIC DENITRIFICATION
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摘要: 通过搭建以砂土为主的地下渗滤系统,考察不同干湿比条件对地下渗滤系统污染物净化能力的影响。在水力负荷为0.08 m3/(m2·d)时,设5种运行条件,分别为连续运行及4个干湿比条件(1∶2、1∶1、2∶1、3∶1)。研究表明:干湿运行对地下渗滤系统的净化能力影响显著,其中干湿比为1∶1时污染物净化效果最好,COD、氨氮、TN、TP去除率分别达到90%、95%、70%、85%。建议北方以砂质土壤为主的地区采用地下渗滤系统处理污水时,稳定运行最佳干湿比为1∶1。Abstract: The feasibility of simultaneous removal of nitrate and atrazine from contaminated water using solid-phase aerobic denitrification was studied. The carbon releasing characteristics results indicated that the starch granules turned to be the most suitable carbon source. Volumetric denitrification rate was 7. 03 mg / ( L h) with the intial nitrate concentration of 55 ~ 60 mg /L under the batch experiments, which indicated that nitrate could be effectively removed. There was no effect on aerobic denitrification process with the atrazine concentration less than 10 mg /L, and the denitrification was repressed when atrazine concentration increased to 20 mg /L. When the initial concentration of atrazine was 0. 1 mg /L and 1 mg /L, the removal efficiency of atrazine was 93% and 94. 8% within 24 h under aerobic denitrification condition, respectively. Atrazine removal was mainly due to the absorption onto solid carbon source.
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Key words:
- solid carbon source /
- aerobic denitrification /
- nitrate /
- atrazine
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