Composite Filler-cri System Treats The Tailrace Of The Chemical Plants Research

Constructed Rapid Infiltration System as a type of land treatment,overcomes the traditional shortcomings that low hydraulic loading of rapid infiltration system. Preserving its simple equipment, low investment, low energy consumption and good water quality. Currently researches on the CRI system are focused on Shenzhen in China. And basically the processing of sewage. In the central region with local soil characteristics under the CRI systems and its use at the tailrace of the chemical plants is seldom reported.With the rapid development of cities, water pollution and water scarcity is increasingly prominent. In this paper, reviewing a lot of information on the basis of literature, tail water for chemical characteristics and conventional wastewater treatment systems high investment, waste and other issues, According to sewage treatment and technological trends, use CRI to treat the tailrace of the chemical plants in HEFEI. Our experiment uses two types of organic load(0.25kg COD·m-3·d-1& 0.1kg COD·m-3·d-1), three operating-drying schedules(1: 1, 1: 2, 1: 3),Considered influencing factors that two different fillers (soil-sand mixed and pure river sand),three soil-quartz ratios--1:9,1:12.5and1:6,Vote with two ways,etc. Studies eight experimental conditions and the feasibility of the use natural river sand soil of processing chemical plant outfall treat the tailrace, And the integration of the various aspects of integrated and compared with the performance of pure river sand filler, make the removal of pollutants and water effects and correlation between operating-drying ratio, loading rate, and filler type.The results show that: constructed rapid infiltration system's COD removal efficiency of the tailrace is good, but unstable. The best can be 90% & less than 60% the worst. Ammonia nitrogen removal efficiency more stable, but obviously not as good as COD. There were large difference of the relatively when in different operating-drying ratio. It was bad when dealing with a large operating-drying ratio. The best efficiency of system is in low load, small Operating-drying ratio, in this condition the treatment effect of soil column is better than the pure sand one. Soil-sand ratio, wet-dry ratio and packing all types of effects on the operation of the system have a greater influence, the interaction between these three factors when dealing with more significant COD. Under the best condition, the configuration's average COD& NH4+-N concentration basically achieve the IV water standards.