两相厌氧耦合生物脱硫组合工艺处理糖蜜乙醇废水的性能

Treatment of Molasses-Alcoholic Wastewater via A Two-Stage Anaerobic Process Combined with Biological Desulfurization

DOI：10.3969/j.issn.1673-1689.2017.03.004

中文关键词: 两相厌氧耦合生物脱硫 糖蜜乙醇废水 硫酸盐还原菌 产甲烷菌 无色硫细菌

英文关键词: two-stage anaerobic process combined with biological desulfurization,molasses alcohol wastewater,sulfate reducing bacteria（SRB）,methane producing bacteria（MPB）,colorless sulfur bacteria（CSB）

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中文摘要:

采用两相厌氧耦合生物脱硫组合工艺处理糖蜜乙醇废水，在启动和运行过程对各处理单元的效能进行了测定分析。结果表明，当进水COD和SO42-负荷提升至18~21 kg/（m3·d）和0.8~1.1 kg/（m3·d）时，组合工艺的COD和SO42-去除率可分别达到95%~96%和86%~90%，出水中COD、SO42-和硫化物含量分别为6 000~6 500、800~850、750~800 mg/L。从各处理单元的运行效能来看，一级厌氧和二级厌氧对COD去除的贡献率分别为86%和11%，同时两者对硫酸盐去除的贡献率分别为90%和7%；而生物脱硫贡献率较小，均在3%左右。由此可见，一级厌氧的处理效能要显著高于二级厌氧。此外生物脱硫单元在高负荷运行条件下的硫化物去除率较低（30%左右），增加曝气量虽然一定程度上可以增加溶氧以及缓解单质硫在陶粒表面的吸附，但同时也可能会影响生物膜的形成和硫细菌的固定，从而造成微生物大量流失。因此如何保证氧气、底物与硫细菌之间的高效传质将是今后需要进一步解决的关键问题之一。

英文摘要:

The operation performance of a process including two-stage anaerobic digestion combined with biological desulfurization for treating molasses alcohol wastewater was evaluated during the startup and stable operation in this study. The results showed that when the COD and SO42- volume loading rate were improved to 15~21 kg/（m3·d） and 0.8~1.1 kg/（m3·d），the removal rate of COD and SO42- were up to 95%~96% and 86%~90%，respectively，and the content of COD，SO42- and sulfide in effluent were 6 000~6 500，800~850 and 750~800 mg/L，respectively. Especially，the contribution rates to the COD and SO42- remove efficiencies for the first stage and the second stage digestion were 86%，11% and 90%，7%，respectively，while both of them were about 3% in the biological desulfurization. Thus，the treatment efficiency of the first stage digestion was significantly higher than that of the second stage digestion. Furthermore，the sulfide remove rate was relatively low（about 30%） in the biological desulfurization process under high loading rate. Although it was possible to increase dissolved oxygen and relieve the adsorption of sulfur on the ceramic surface by improving aeration strength，the increasing aeration also affected the formation of biofilm and fixation of sulfur bacteria，which led to the loss of microorganisms. Hence，how to ensure mass transferring efficiently among the substrate，sulfur bacteria and oxygen was the key problem to be solved in the further research.

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