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为查明齐家水源地取水设备腐蚀与堵塞的机理 ,在现场测试地下水 Eh值和 p H值的基础上 ,采集了地下水、腐蚀管材及沉砂管中沉积物样品。利用微生物分析、X衍射分析、显微镜鉴定和扫描电镜分析等手段 ,结合水文地球化学特征研究 ,认为滤水管的石墨化及防腐泵铸铁外壳的腐蚀为宏观腐蚀电池电化学腐蚀 ;滤水管、扬水管内壁发生了厌氧硫酸盐还原菌电化学腐蚀和厌氧 H2 O-CO2 电化学腐蚀。堵塞物大部分是腐蚀产物 ,堵塞伴随腐蚀而产生。该水源地水井堵塞的机理与国内外普遍认同的富 Fe2 +地下水氧化结垢使水井堵塞的机理不同。
In order to find out the mechanism of corrosion and plugging of water intake equipment in Qijia water source, groundwater, corroded pipelines and sediment samples in desilting pipelines were collected on the basis of field tests of groundwater Eh and p H values. By means of microbiological analysis, X-ray diffraction analysis, microscopic identification and scanning electron microscopy analysis, combined with the study of hydrogeochemical characteristics, it is considered that the graphitization of the water filtering pipe and the corrosion of the cast iron shell of the anti-corrosion pump are the electrochemical corrosion of the macro corrosion cell; Anaerobic sulfate reducing bacteria electrochemical corrosion and anaerobic H2 O-CO2 electrochemical corrosion occurred on the inner wall. Most of the blockage is corrosion products, clogging with the resulting corrosion. The mechanism of blockage of water wells in this water source is different from that of well-known scaling-up of scale-rich Fe2 + groundwater in wells.