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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Investigation On Laboratory And Pilot-scale Airlift Sulfide Oxidation Reactor Under Varying Sulfide Loading Rate
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Investigation On Laboratory And Pilot-scale Airlift Sulfide Oxidation Reactor Under Varying Sulfide Loading Rate

机译：硫化物负荷率变化下的实验室和中试规模的空运硫化物氧化反应器研究

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摘要

Airlift bioreactor was established for recovering sulfur from synthetic sulfide wastewater under controlled dissolved oxygen condition. The maximum recovered sulfur was 14.49 g/day when sulfide loading rate, dissolved oxygen (DO) and pH values were 2.97 kgHS~- /m~3-day, 0.2-1.0 mg/L and 7.2-7.8, respectively. On the other hand, the increase in recovered sulfur reduced the contact surface of sulfide oxidizing bacteria which affects the recovery process. This effect caused to reduce the conversion of sulfide to sulfur. More recovered sulfur was produced at high sulfide loading rate due to the change of metabolic pathway of sulfide-oxidizing bacteria which prevented the toxicity of sulfide in the culture. The maximum activity in this system was recorded to be about 3.28 kgS/kgVSS-day. The recovered sulfur contained organic compounds which were confirmed by the results from XRD and CHN analyzer. Afterwards, by annealing the recovered sulfur at 120℃ for 24 hrs under ambient Argon, the percentage of carbon reduced from 4.44% to 0.30%. Furthermore, the percentage of nitrogen and hydrogen decreased from 0.79% and 0.48% to 0.00% and 0.14%, respectively. This result showed the success in increasing the purity of recovered sulfur by using the annealing technique. The pilot-scale biological sulfide oxidation process was carried out using real wastewater from Thai Rayon Industry in Thailand. The airlift reactor successfully removed sulfide more than 90% of the influent sulfide at DO concentration of less than 0.1 mg/L, whereas the elementary sulfur production was 2.37 kgS/m~3-day at sulfide loading rate of 2.14 kgHS~-/m~3-day. The sulfur production was still increasing as the reactor had not yet reached its maximum sulfide loading rate.
机译：建立了Airlift生物反应器，用于在受控溶解氧条件下从合成硫化物废水中回收硫。当硫化物​​负载率，溶解氧（DO）和pH值分别为2.97 kgHS·/ m〜3·天，0.2〜1.0 mg / L和7.2〜7.8时，最大回收硫为14.49 g / day。另一方面，回收硫的增加减少了硫化物氧化细菌的接触表面，从而影响了回收过程。这种作用导致减少了硫化物向硫的转化。由于硫化物氧化细菌的代谢途径发生变化，从而阻止了培养物中硫化物的毒性，因此在高硫化物负载率下产生了更多的回收硫。据记录，该系统中的最大活性约为3.28 kgS / kgVSS-天。 XRD和CHN分析仪的结果证实了所回收的硫中含有有机化合物。然后，在环境氩气下，将回收的硫在120℃下退火24小时，碳含量从4.44％降至0.30％。此外，氮和氢的百分比分别从0.79％和0.48％降低到0.00％和0.14％。该结果表明通过使用退火技术成功提高了回收的硫的纯度。中试规模的生物硫化物氧化工艺是使用来自泰国Thai Rayon Industry的实际废水进行的。空运反应器在DO浓度小于0.1 mg / L时成功去除了进水硫化物中90％以上的硫化物，而在硫化物负载率为2.14 kgHS-// m时，单质硫产量为2.37 kgS / m〜3天。约3天。由于反应器尚未达到其最大的硫化物装载速率，因此硫的产量仍在增加。

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