摘要
采用模拟废水启动运行两级反应器,一级厌氧出水调节pH后作为二级UASB反应器进水。结果表明,一级厌氧出水中有机酸以乙酸为主,含有少量甲酸、丙酸和丁酸,反应器酸化时,丁酸含量迅速增大,二级厌氧出水基本不含有机酸;一级厌氧消化过程产生的气体中CO_2含量达到75%左右,甲烷含量仅为5%左右;二级UASB反应器产生的气体中CH_4含量保持在70%~75%之间;COD一级和二级去除率最终分别稳定在40%和90%左右,一级UASB反应器对硫酸根去除效果较好,硫酸根一级去除率超过80%,出水硫酸根浓度低于400 mg/L,二级厌氧出水硫酸根浓度未超过200 mg/L。
The two-stage UASB reactor was conducted by adding the simulated wastewater, the influent of the second stage UASB reactor was the effluent of the first stage anaerobic reactor which pH was adjusted. The results showed that the acetic acid was the mainly organic acid of the first stage anaerobic effluent and the formic acid, propionic acid and butyric acid was less. The concentration of butyric acid was increased rapidly during the acidification period in the first stage anaerobic reactor. In addition, the effluent of second stage anaerobic contained almost no organic acids. The CO2 content in the biogas reached 75% in the first anaerobic reactor, while the CH4 content was only about 5%. In the second stage UASB reactor, the CH4 content of the biogas kept between 70% with 75%. The COD removal rate of the first and the second stage were about 40% and 90%, respectively. The sulfate removal rate in the first UASB reactor was over 80%, the effluent concentration of sulfate was less than 400 mg/L, and the second anaerobic effluent concen- tration of sulfate was less than 200 mg/L.
出处
《环境保护与循环经济》
2017年第6期28-34,37,共8页
environmental protection and circular economy
关键词
糖蜜酒精废水
厌氧消化
UASB
硫酸根
molasses alcohol wastewater
anaerobic digestion
UASB
sulfate
