Study on Moderate Treatment Technology of Vegetation Restoration and Reclaimed Water in Northwest Desert Area

Abstract

The main purpose of this project is to propose the requirements for the quality of recycled water suitable for vegetation reconstruction and conservation and soil environmental protection in mining areas. It is mainly to study the wastewater (mine domestic sewage) generated from coal bases in arid desert areas in northwest China, and use the treated recycled water for vegetation in mining areas Reuse water and ensure good results of vegetation restoration. According to the information and field visits, it was found that domestic sewage in the mining area is similar to urban sewage, and COD, ammonia nitrogen (NH4+-N), Total nitrogen (TN) and total phosphorus(TP) are mainly removed. Therefore, it is necessary to carry out moderate sewage treatment according to the climatic characteristics of arid desert areas in the northwest (ie, drought, low temperature at night, and large temperature difference between day and night). The SBR reactor was used to moderately treat domestic sewage in the experiment. The optimized HRT was 6h; the optimal filler addition ratio was 1/4; the device treatment effect was best when the carbon-nitrogen ratio was 7/1; the effect is the best. The effluent COD at the optimal operating conditions is 58 mg/L, ammonia nitrogen is 9.4 mg/L, total nitrogen is 14 mg/L, and total phosphorus is 2.8 mg/L, which can meet the water quality standards for reclaimed vegetation restoration.