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| Treatment of Anaerobic Effluent of Dairy Wastewater by Ammonia Stripping-Coagulation Combination |
| Received:August 10, 2014 |
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| KeyWord:slurries;UASB;ammonia stripping;coagulation |
| Author Name | Affiliation | E-mail | | JIN Yao-yong | Energy and Environment School, "Water Purification and Utilization Technology of Biofilm Process" Engineering Research Center of Ministry of Education, Anhui University of Technology, Maanshan 243032, China | | | MENG Hai-ling | Energy and Environment School, "Water Purification and Utilization Technology of Biofilm Process" Engineering Research Center of Ministry of Education, Anhui University of Technology, Maanshan 243032, China | menghlahut@163.com | | LIU Zai-liang | Energy and Environment School, "Water Purification and Utilization Technology of Biofilm Process" Engineering Research Center of Ministry of Education, Anhui University of Technology, Maanshan 243032, China | | | ZHANG Hui | Energy and Environment School, "Water Purification and Utilization Technology of Biofilm Process" Engineering Research Center of Ministry of Education, Anhui University of Technology, Maanshan 243032, China | |
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| Abstract: |
| The UASB effluents often contain relatively high ammonia, which affects their secondary treatment. In this experiment, a combined ammonia stripping and coagulation method was used to treat the UASB effluents of dairy farm wastewater from Maanshan Mengniu modern ranch. In the stripping experiment, influences of pH values, stripping time, air-liquid ratios(volume ratio), and temperature on ammonia removal rate were investigated. In the coagulation experiment, PFS(Polymeric Ferric Sulfate) and PAC(Polyaluminium Chloride)were selected as coagulants to treat the ammonia stripping effluent. Influences of coagulant rates, pH values, stirring rates, stirring time, and settlement time on coagulation effectiveness were studied. The results showed that the highest ammonia removal rate was 85.5% at pH value of 11, stripping time of 5 hours, air-liquid ratio of 3000 and temperature of 30 ℃, reducing ammonia concentration from 468.1 mg·L-1 to 67.9 mg·L-1. PFS was a better coagulant, and decreased CODCr and SS concentrations to 154.1 mg·L-1 and 123.2 mg·L-1 from 713.4 mg·L-1 and 458.0 mg·L-1, respectively. The CODCr and SS removal rates were up to 78.4% and 73.1%, respectively, at PFS rate of 2.85 g·L-1, stirring rate of 180 r·min-1, stirring time of 4 min and settlement time of 20 min. After coagulation, ammonia nitrogen further dropped to 50.9 mg·L-1. The final effluent met the requirements of "Pollutant discharge standards of livestock and poultry breeding"(GB 18596-2001). |
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