三种再生水工艺出水中微生物和氮转化对碳钢腐蚀的影响研究  

On corrosion of carbon steel by microbial and nitrogen conversion in three processes of reclaimed water

作　　者：张雅君[1] 黄欢欢 孙丽华[1] 杜婷婷 ZHANG Ya-jun;HUANG Huan-huan;SUN Li-hua;DU Ting-ting(Key Laboratory of Urban Stormwater System and Water Environment,Co-constructed Province-Ministry of Education,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Department of Environmentand Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing100044,China;Beijing Suburban WaterAffairs Center,Beijing 100195,China)

机构地区：[1]北京建筑大学城市雨水系统与水环境教育部重点实验室,北京100044 [2]北京建筑大学环境能源工程学院,北京100044 [3]北京市郊区水务事务中心,北京100195

出　　处：《安全与环境学报》2019年第6期2129-2136,共8页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51678027)

摘　　要：为研究真实再生水处理工艺出水中微生物和氮转化所导致的管网腐蚀机理,从腐蚀速率、腐蚀产物的形貌和成分等方面分析了三种再生水处理工艺(再生水常规处理工艺、常规+PAC吸附工艺、常规+PAC+超滤膜过滤工艺)出水中微生物和氮含量对碳钢的腐蚀情况。另外,通过调控自主设计的AR反应器的转速、温度等因素,模拟了真实管网中的水力循环。结果表明:当硝酸盐氮和氨氮的浓度不同时,水中的微生物含量有差别,最终表现出的腐蚀现象不同。在"常规+PAC吸附+超滤膜过滤"工艺中,抑制碳钢腐蚀的NRB-Fe、NRB-S类细菌含量最多,分别为3. 34%、12. 00%,生成的腐蚀产物密实,该工艺的出水中发生了基于Fe(Ⅱ)氧化、NO3-还原的反硝化反应,这有助于生成密实的腐蚀产物,表现出较强抑制碳钢腐蚀的现象;"常规"工艺中的NRB-Fe、NRB-S类细菌含量次之,分别为3. 04%、6. 89%,该工艺的出水中也发生了基于Fe(Ⅱ)氧化、NO3-还原的反硝化反应,β-变形菌纲脱氯菌属能够促进Fe(Ⅱ)/Fe(Ⅲ)之间的循环。同时,IRB和NRB-Fe之间相互作用能够生成更多的铁氧化物沉淀(Fe3O4),表现出抑制碳钢腐蚀的现象;"常规+PAC吸附"工艺中的NRB-Fe、NRB-S类细菌含量最少,分别为0. 27%、4. 01%,形成的腐蚀产物比较松散,该工艺的出水中发生了基于0价铁氧化、硝酸盐还原的反硝化反应,可加速腐蚀,表现出较强的腐蚀性。The experimental test is aimed to trace and investigate the corrosion mechanism of the pipe network caused by the microorganism and nitrogen transformation in the effluent of the authentic reclaimed sewage treating process(or,known as the recycled water conventional treatment process), respectively.And,for the said purpose,we have analyzed the corrosion conditions of the microorganisms and nitrogen content in the effluent of the 3 reclaimed water treating processes on the carbon steel from the point of view of morphology and composition of the products to be corroded. In addition,we have also simulated the hydraulic circulation in the real pipe network by adjusting the rotating speed and temperature of the AR reactor designed by ourselves.The results of our experimental study prove that the concentration rates of the nitrate nitrogen and ammonia nitrogen are different,with the different microbial content rates and different final corrosion consequences. As is well known,in the "conventional +PAC adsorption + ultra filtration membrane filtration"process,most of NRB-Fe with the content of 3. 34%,and NRB-S bacteria with the content of 12. 00%,tend to exhibit greater corrosion-inhibitive tendency of the carbon steel. The effluent of this process can be found on the basis of Fe(II) oxidation and de-nitrification of NO3-reduction,which can contribute to the formation of the dense corrosion products,displaying strong inhibitive tendency of the carbon steel corrosion. And,the next is the content of NRBFe and NRB-S bacteria in the"conventional"process is second,whose content rates have been found at the rates of 3. 04% and6. 89%. And,in the effluent of the "conventional" process,there would occur the oxidation and denitrification reaction based on the Fe(II) oxidation and NO3-reduction. However,the Dechloromonas tends to promote the circulation between Fe(II) &Fe(III),whereas the interaction between IRB & NRB-Fe are likely to generate more iron oxide precipitates(Fe3 O4) to inhibit the carbon steel corrosion. And,thus,sin

关 键 词：环境工程学 粉末活性炭吸附 超滤膜过滤 铁腐蚀 微生物腐蚀 氮转化 

分 类 号：X524[环境科学与工程—环境工程]