Abstract
Overflow rainwater is a serious environmental problem nowadays, which attracted the most researchers’ attentions. Accordingly, effective and economic treatment of overflow rainwater is highly required. This study aimed to design a high-loaded clarifier equipment and developed an innovative overflow rainwater treatment. The high-loaded clarifier equipment was consisted of grid, pump, coagulant, reactor, and the most important part of lamella clarifier with serried metal plates. The removal of pollutants in overflow rainwater with the high-loaded clarifier equipment was evaluated. The pollutions removal rate of overflow rainwater was investigated with 65% COD and 90% SS, approximately.
Highlights
Surface water quality is negatively influenced by stormwater runoff
In our designed equipment, serried metal plates were adopted inside the high-loaded clarifier, which could promote the Suspended Solid (SS) and Chemical Oxygen Demand (COD) removal rate of overflow rainwater
It can be concluded that the COD removal rate increased with increasing flow rate, while as the SS removal rate was not good relation with the flow rate
Summary
Surface water quality is negatively influenced by stormwater runoff. The overflow rainwater effect is the main impetus for pollutants transportations and increases pollutant loads to surface water especially [1]. High-loaded clarifier equipment was designed and set up near the Nanfei River. The efficiency of the high-loaded clarifier equipment in the treatment of overflow rainwater was investigated. On a clarifier the settling area is the tank surface and on lamella settlers it is the total area of the inclined plates projected on a horizontal surface. In our designed equipment, serried metal plates were adopted inside the high-loaded clarifier, which could promote the SS and COD removal rate of overflow rainwater. The high-loaded clarifier equipment was characterized as high removal rate of pollutions, hydraulics impact resistance, and stable effluent in terms of the results of experiments. Fixed 20 plate racks inside, the effective volume of 20 m3, surface loading rates of 12.5 m3/(m2h), hydraulic retention time of 24 min; IV: 2 mixers. Suspended Solid (SS) and Chemical Oxygen Demand (COD) were determined by national standard analysis method of China
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