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Ammonia Removal from Well Water Using Natural Zhenjiang Zeolite

Author: LiangGuoFei
Tutor: YanPeiShi
School: Nanjing Agricultural College
Course: Animal Nutrition and Feed Science
Keywords: ammonia nitrogen Bacterium coli Bio-zeolites CODMn linear velocity ZhenJiang zeolites
CLC: X52
Type: Master's thesis
Year: 2008
Downloads: 118
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Abstract

Water plays an important role in production and lives of human. But affected by human activities, water pollution is getting more and more serious. The investigation results of well water for chichen production in HuanXu town during 2005 and 2007 showed that the over standard rate of ammonia nitrogen and COD_Mn were 95% and 45% respectively, Bacterium coli was over standard too, Sanitation conditions of water source for human and cultivation have been an important problem. This paper focuses on search of micro-polluted water source treatment process that economy, practical and effective, to raise suitable micro-polluted water source treatment project.First, we investigated the influencing factors and the removal effects of low density ammonia nitrogen in micro-polluted water source by ZhenJiang-zeolites. The suitable particle size of zeolite was 0.18-0.9mm and the suitable dosage was 4g/L. the removal rate of ammonia nitrogen was about 85% under static experiment condition; Water temperature and pH value, though removal rate was not significant difference when the pH value was 4 to 8, influenced removal rate of ammonia nitrogen; Also organics decreased the removal of ammonia nitrogen, the ammonia remmoval rate decreased to 72.86% by 82.28% as the A_uv254 increased to 0.06cm^-. ZhenJiang zeolites maximum work adsorptive capacity was 78.5mg/100g through fitting the Langmuir isothermal adsorption model.Secondly, we studied the breakthrough curve and the effects of linear velocity and zeolites bed height on ammonia removal under kinesis experiment condition. Then determined suitable linear velocity was 4-7m/h. On the basis of static experiments, the parameters related to linear velocities such as adsorption capacity, height of zeolites bed and breakthrough time were calculated in the kinesis experiment. The relations of ion exchange column dimension between linear velocities and breakthrough etc. were calculated, The results showed that the designed model accords with experimental data which provides design parameters for basis and practical in scale.Finally, the treatment effects of bio-zeolites on micro-polluted water source were studied through both laboratory and spot experiments. Results of laboratory experiments demonstrated that the additions of strain and micropore film were benefited to formation of bio-zeolites. The times of bio-zeolites formation of Z group, FM group, SZ group and SF group were 35d, 30d, 18d and 16d respectively. The suitable filter velocity for bio-zeolites to treat micro-polluted water source was 6-8m/h. the removal rates of ammonia nitrogen and COD_Mn were 95.5% and 39.8% respectively under suitable filter velocity conditions; Results of spot experiments demonstrated that ammonia nitrogen and nitrite nitrogen concentrations of micro-polluted water source that treated were lower than 0.2mg/L and 0.01mg/L respectively when bio-zeolites shaped. The removal rate of COD_Mn by bio-zeolites which was 20% higher than natural zeolites was about 45%. Removal rates of Bacterium coli by zeolites at the 4th day and the 11th day of bio-zeolites formation period were 93.7% and 69.3% respectively. The control of suitable filter velocity for bio-zeolites was important.

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