Papers by Keyword: Constructed Rapid Infiltration System

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Authors: Jun Min Chen
Abstract: The total phosphorus removal efficiency is very low and the TP concentration of the effluent can not reach the national standard of GB18918-2002 in CRI system. In order to solve these problems, a series of comparative experiments on phosphorus adsorption capacity of 5 kinds of special infiltration media are carried out. And then another series of comparative experiments on the total phosphorus removal efficiency of 4 kinds of infiltration media combinations are also conducted, the experimental results show that the phosphorus adsorption capacity of sponge iron is the best one among the special infiltration media selected;the phosphorus removal efficiency of the infiltration media including 1/6 sponge iron is much better than the infiltration media including only sand; and the phosphorus removal efficiency of the infiltration media combination with sponge iron homogeneously mixed with sand, is better than the infiltration media combination with the same weight of sponge iron concentrated. The experimental results will help to explore the development of the new type composite infiltration media of the CRI System.
1735
Authors: Jun Min Chen, Xiao Lin Yao
Abstract: Abstract. In order to investigate the optimal thickness of infiltration media in the Constructed Rapid Infiltration System, the artificial soil column is used to simulate the Constructed Rapid Infiltration System, and the CODCr, NH3-N and TN concentrations of the effluent from all the sampling sites are monitored. The experimental results and analysis show that the thickness of infiltration media exerts a significant influence on the CODCr, NH3-N and TN concentration and removal efficiency of the effluent; the CODCr, NH3-N and TN are mainly removed in the 0-1800mm zone of the artificial soil column; the total CODCr removal efficiency increases, as the thickness of infiltration media increases, but the CODCr removal efficiency in the 1800-2200mm zone is very low; the NH3-N and TN removal efficiency reaches the maximum where the thickness of infiltration media is 1800mm; the NH3-N and TN concentration of the effluent from 1800-2200mm zone dose not decrease, but increase 5-8%, due to the assimilation denitrification and amemoniation reaction on the end of the anaerobic zone; in consideration of the effluent quality, efficient biodegradation zone, construction investment, etc. the optimal thickness of infiltration media in CRI system should be 1800mm.
1703
Authors: Yan Juan Liu, Ming Zhu, Ya Wen Yang, Ai Bin Kang
Abstract: Taking high concentration livestock wastewater as research object, The results showed that the constructed rapid infiltration system operated at the largest hydraulic loading of 0.26m/d, and during the period of the flooding for ond day and drying for two days, the main efficiency of pollutants occurred in filter height of 0.65m, with the maximum removal efficiency of COD and ammonia nitrogen as 80%; TF and MLVSS also reached maximum.
728
Authors: Wei Li, Huan Zhen Zhang, Guang Ying Liu, Xin Zhang
Abstract: Based on synthesizing a lot of home and abroad researches, the paper expounded the research status of infiltration media, filtration bed thickness, hydraulic loading cycle, wet/dry ratio, oxygen restoration, removal mechanism, system blocking, and engineering application in the constructed rapid infiltration system and the progress in improving and strengthening the CRI system. In addition, the research direction and development prospect were discussed.
3723
Authors: Jun Min Chen, Zhen Hua Sheng
Abstract: Abstract. The TN removal efficiency is very low and the TN concentration of effluent can not meet the national standard of GB18918-2002 in the CRI system. In order to increasingly improve the denitrification efficiency of the CRI system, the artificial soil column is used to simulate the CRI system with 4 kinds of wastewater step-feeding modes. A series of comparative experiments are carried out, and the experimental results show that the TN removal efficiency of the CRI system is controlled by the denitrification process, and the denitrification process takes place mainly in the 900-1400mm zone of the artificial soil column; with the step-feeding mode, the C/N ratios of effluent from the 900-1400mm zone increase obviously in the CRI system, and in the case 4, the C/N ratios of effluent from the 900-1400mm zone are about 2, which is the closest to the optimal C/N ratio of the denitrification process; the best wastewater feeding mode of the CRI system is that the wastewater is pumped into the system from the infiltration media surface and the starting point of the anaerobic zone at the same time, with the influent amount ratio of 2:1.
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