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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >The effect of arsenite on denitrification using volatile fatty acids (VFAs) as a carbon source
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The effect of arsenite on denitrification using volatile fatty acids (VFAs) as a carbon source

机译：砷对挥发性脂肪酸（VFA）作为碳源的反硝化作用

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摘要

A lab-scale sequencing batch reactor (SBR) was operated at a solids retention time (SRT) of 20 ±2.5 days to develop a consortium of denitrifying bacteria with a mean specific denitrification rate of 0.11 g nitrate (NO_3~--N)/g volatile suspended solids (VSS)/day. This biomass was used in a series of denitrification batch tests which used volatile fatty acids (VFAs) as their external carbon source. The VFAs were generated from an anaerobic digester that had an effluent VFA concentration of 5655 ± 876 mg/L (expressed as acetic acid (HAc)). The denitrification batch reactors were spiked with NO_3~--N (carbon-to-nitrogen (C:N) ratio of 3.0) and different concentrations of arsenite (a trivalent arsenic salt) in order to quantify the effect of arsenite on the denitrification process. A steady deterioration in the ability of the biomass to denitrify under increasing arsenite concentrations was observed with the mean specific denitrification rate dropping from 0.183 g NO_3~--N/gVSS/day at an arsenite concentration of 5 mg/L, to a value of 0.047 g NO_3-N/gVSS/day at a concentration of 25 mg/L.
机译：在固相保留时间（SRT）为20±2.5天的条件下运行实验室规模的测序间歇反应器（SBR），以开发反硝化细菌财团，平均比反硝化率为0.11 g硝酸盐（NO_3〜--N）/ g挥发性悬浮物（VSS）/天。该生物质用于一系列反硝化分批测试，这些测试使用挥发性脂肪酸（VFA）作为其外部碳源。 VFA是从厌氧消化池中产生的，出水VFA浓度为5655±876 mg / L（表示为乙酸（HAc））。在反硝化间歇反应器中掺入NO_3〜-N（碳氮比（C：N）为3.0）和不同浓度的亚砷酸盐（三价砷盐），以量化亚砷酸盐对反硝化过程的影响。在砷浓度增加的情况下，观察到生物质反硝化能力的稳定下降，在砷浓度为5 mg / L时，平均比反硝化速率从0.183 g NO_3〜--N / gVSS / day下降至0.047 g NO_3-N / gVSS /天，浓度为25 mg / L。

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