極地微生物中脫氮菌篩選與脫氮性能的研究.pdf

1、分類號(hào)： 分類號(hào)：X5 密級(jí)：公開 密級(jí)：公開 UDC：502 學(xué)校代碼： 學(xué)校代碼：11065 碩 士 專 業(yè) 學(xué) 位 論 文 極地微生物 極地微生物中脫氮菌 中脫氮菌篩選與脫氮性能 篩選與脫氮性能的研究 的研究 指 導(dǎo) 教 師張 培

2、玉學(xué) 位 類 別工 程 碩 士專 業(yè) 領(lǐng) 域環(huán) 境 工 程答 辯 日 期2017 年 11 月 19 日 答 辯 人吳 占 東Abstract One of the main difficulties and hot spots in sewage treatment is the discharge of nitrogen and phosphorus removal. The traditional sewage treatment

3、 method uses the medium temperature bacteria for biological treatment, but the northern part of China has a long winter time, the climate is cold, not suitable for the growth and reproduction of medium temperature bacter

4、ia, sewage treatment effect is poor. The use of low temperature microorganisms for sewage treatment can improve the effect of sewage treatment in the northern region. Therefore, it is of great significance to study the e

5、ffect of low temperature microbial flora denitrification efficiency. In this experiment, 81 strains of low temperature strains were isolated and purified by microbial isolation from low-temperature microorganisms in Arct

6、ic marine sediments. After gradual screening, strains WZD-1-35, WZD-3-52, WZD-4-17 and WZD -4-28 and WZD-4-29 have good denitrification ability. The strains of WZD-1-35, WZD-4-33, WZD-4-58 and WZD-4-29 have good denitrif

7、ication ability. Since the strains WZD-1-35 and WZD-4-29 both had the ability of nitrification and denitrification, the strains WZD-1-35 and WZD-4-29 were mixed and the denitrification performance was studied. The remova

8、l efficiency of NH4+-N was 76.8% and the removal rate of NO3--N was the highest when the mixed flora was the best at 15 ℃. And NH4+-N and NO3--N were removed at different salinity conditions. When the salinity was 2%, th