A_2N-SBR短程硝化反硝化系统内菌种培养驯化的试验研究

为了研究A_2N-SBR短程硝化反硝化系统内亚硝化细菌和短程反硝化聚磷菌的培养驯化,以实际生活污水为试样,对A_2N-SBR系统内N-SBR反应器和A_2-SBR反应器的菌种分别进行培养驯化。结果表明:在温度为26～28℃,pH值为7.5-8.0,DO质量浓度为0.4～0.8 mg/L的条件下,经过38 d的连续运行,在N-SBR反应器内驯化出了亚硝化细菌,氨氮的去除率和亚硝化率分别达到97.0%和96.5%;在温度为25～26℃,pH值为7.0～8.0的条件下,采用先厌氧/好氧后厌氧/缺氧的运行方式,经过78 d的连续运行,在A2-SBR反应器内驯化出短程反硝化聚磷菌,COD和P_4^(3-)的去除率分别达到86.2%和96.4%,NO_2^--N的质量浓度也由29.9 mg/L降为0.35mg/L。研究表明,通过控制适宜的环境条件,在A_2N-SBR系统的N-SBR反应器和A_2-SBR反应器内能够分别培养驯化出亚硝化细菌和短程反硝化聚磷菌。

Nitrosation Reaction Without Nitrogen Oxide Waste Gas Emission and Its Engineering Practice

The gas-liquid phase equilibrium is used in controlling the nitrosation reaction process. Decomposition of nitrous acid and oxidation side reaction.are suppressed in a closed reaction system. The system pressure is used as the criterion of the end of reaction, avoiding excessive feeding and reducing＇the decomposition＇of nitrous acid. The head space of the reactor is used as the gas buffer, stabilizing the feeding fluctuations and inhibiting the side reaction, decomposition of nitrous acid. Nitrogen oxide concentration is controlled at the minimum level.Thus the zero release ofnitrogen ox!de waste gas can be achieved without using any absorption process.