副产甲醇作为外加碳源时脱氮效果的应用研究

Study on the Application of Nitrogen Removal as a By-product of Methanol as an External Carbon Source

作为细菌代谢的必需物质和能量来源,碳源在污水生物脱氮处理中起着重要的作用,是反硝化反应得以顺利进行的必备条件。但是,外碳源的使用势必会增加污水处理厂的运行费用,目前对碳源的种类、运行效果及投加量等也有大量研究。本文以某化工厂副产甲醇(纯度约90%)为碳源,研究了进水pH对脱氮效果的影响,探究了出水总氮达到15 mg/L时对进水总氮的要求。结果表明,进水总氮约15 mg/L,pH在7.0～8.5时,总氮去除率至少达到50%,但进水总氮达到约29 mg/L时,出水总氮有超标的风险。

As a necessary substance and energy source for bacterial metabolism, the carbon source plays an important role in the biological nitrogen removal treatment of sewage, and is a necessary condition for the denitrification reaction to proceed smoothly. However, the use of external carbon sources is bound to increase the operating costs of sewage treatment plants. At present, there are also many studies on the types, operating effects and dosage of carbon sources. In this paper, the effect of influent pH on the denitrification effect was studied by using a by-product methanol （purity of about 90%） as a carbon source. The requirement for total influent nitrogen was studied when the total effluent nitrogen reached 15 mg/L. The results showed that the total nitrogen influent was about 15 mg/L, and the total nitrogen removal rate reached at least 50% when the pH was 7.0～8.5. However, when the influent total nitrogen reached about 29 mg/L, the total effluent nitrogen had a risk of exceeding the standard.