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Chemical Precipitation Denitrification Process Conditions And The Material Impact Of Methylamine Class Research

Posted on:2007-09-03Degree:MasterType:Thesis
Country:ChinaCandidate:H F WangFull Text:PDF
GTID:2191360185471084Subject:Environmental Engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of industry, their wastewater discharge is becoming more and more, and most of them are high strength ammonia nitrogen wastewater, such as metallurgy wastewater. coked wastewater. the wastewater in the chemical plant and the plant that produce fertilizer, so how to remove ammonia nitrogen from wastewater by economy effectively is a problem that urgently needs to be solved for environment researchers.At present, there are many technologies that remove ammonia nitrogen, and the technology of bio-denitrification is a hot spot of research, but it has some disadvantages, such as occupying too much space, long debugging period . it demands high water quality and only can remove low concentration ammonia nitrogen wastewater et al. It is studied in this essay how to remove high strength ammonia nitrogen from wastewater by chemical precipitation, that is, magnesium salt and phosphate salt are added into this kind of wastewater, and precipitation occurs at an optimal condition, to produce magnesium-ammonium-phosphate which is an insoluble compound and contains three nutrients of phosphorus, nitrogen and magnesium. These nutrients are valuable to plants, it is a valuable slowly released duplicate fertilizer. This essay researchs the condition that chemical precipitation removal ammonia nitrogen in the first part of the research, which has several steps as follows: firstly, the sequence of factors is determined by orthogonal experiment; secondly, the effects of the single factor are analyzed, and then the research determines the influence of pH and magnesium, ammonia and phosphate molar ratios on the several artifical wastewaters with high strength ammonia nitrogen; at last, the research makes a conclusion of the optimal condition of dealing with these artificial wastewaters, they are pH between 10.0 and 10.5, magnesium, ammonium and phosphate molar ratios of (1.2-1.4) :1.0: C1.1-1.0), in the optimal condition, the ammonia nitrogen removal rate is above 93%. In the second part, methylamine artificial wastewater is researched by chemical precipitation, the research analyzes the optimal pH. Mg:N. P:N influence on ammonia nitrogen removal when methylamine.
Keywords/Search Tags:Methylamine Wastewater, Chemical Precipitation Method, Magnesium- Ammonium-Phosphate, Ammonia Nitrogen Removal, Influence Factor
PDF Full Text Request
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