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The Study on the Biological Removal of Iron and Manganese in the Groundwater of Northeastern Rural Area

Author: HanGuiShan
Tutor: WangHeLi；YangHong
School: Jilin University
Course: Environmental Engineering
Keywords: Northeast towns biological manganese nitrate nitrogen groundwater
CLC: R123.1
Type: Master's thesis
Year: 2011
Downloads: 93
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Abstract

Groundwater is an important drinking water source,most of the rural area are drinking grondwater. However,Iron and manganese content in groundwater of many rural areas are exceeded the standard. So most of the rural area have a safe drinking water problem. For excessive iron and manganese content of the problem,design a small rural water treatment equipment to test and use the groundwater of peasant household in Shuangyang District,Changchun City in November 2009 to December 2010 to test water. Through different media,different quality,different intensity and filter backwash rate to comparative test,the test results were analyzed and summary. Iron and manganese were removed by biological oxidation. Adjusted by adding unit iron and manganese concentrations in water.Pick a filter and experiment study with it in the hydraulic strength、fast start study and stratification of cultivated mature filtration column. In some of the rural area,the groundwater has iron and manganese pollution which also often accompanied by ammonia and nitrate nitrogen pollution,so it is effect to study the result after adding ammonia and nitrate to iron and manganese filtering layer .Through the experimental study can conclude that:(1) The filter layer of manganese sand filter have the shortest maturity and adapt to the impact of the strongest water. The filter layer of Quartz sand and rare earth porcelain sand filter have a similar maturity and result. The the manganese effect of ceramic and volcanic rocks has been unable to stabilize standard. But for economic considerations,quartz sand filter to deal with iron and manganese is the best choice.(2) The election of central mature quartz sand filter layer is the best,followed by the upper and lower worst.(3) the optimization design studies of the filtering layer have shown that most removal of iron in filter layer of manganese sand filter front 20cm, and most removal of manganese front 70cm. Therefore,iron and manganese filtration column can be selected height 70cm when the manganese concent under 1.5mg / L.(4) The removal result of iron and manganese in filter column is normal after nitrate addition to filter column. At the beginning,The removal result is normal after ammonia addition to,but A half month later,concentration of manganese of outflow water in filter column gradually increased,manganese outflow water sometimes more than equal to manganese inflow water,only a small portion of ammonia into nitrate,most converted to nitrite. the ammonia on mature iron and manganese filter layer is not directly destructive, mature iron and manganese filter layer is affected indirectly by generated nitrite.after ammonia is added to.So culture iron and manganese filter layer apply to removal of groundwater nitrate exist but not apply to removal of ammonia in the groundwater there.

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