Abstract
In recent years, with the degree of urban-rural integration, the economic level of rural areas and the improvement of residents’ health awareness, the water quality pollution of rural domestic sewage has increased year by year, and the problem of rural sewage discharge has become increasingly prominent. In order to improve the rural water environment and solve the problem of random discharge of sewage, this paper takes the rural domestic sewage as the research object, and takes the natural sedimentation and anaerobic fermentation as the main means to study the on-site resource utilization technology of sewage. It was found that after 3 hours of sewage sedimentation, organic suspended solids settled naturally, resulting in a significant decrease of COD in the upper sewage to 93.29 mg/L. Because of the special bimolecular structure of LAS, the concentration of LAS in surface sewage increased sharply to 7.68mg/L, but it was lower than 10mg/L, which met the irrigation water standard.
Highlights
IntroduceRural water consumption increases sharply year by year, and water quality gradually deteriorates
China is a big country in water resources
By 2017, the sewage treatment method has been unable to meet the total water resources in China is about 2,876.12 billion needs of sewage treatment, so the sewage is mostly m3, including groundwater resources, which is about two-stage or multi-stage treatment, and sand settling tank
Summary
Rural water consumption increases sharply year by year, and water quality gradually deteriorates. Within 0.5h, the COD of S45 water sample increased to 409.65mg/L, which was 1.29 times that of the initial water sample, while the COD of SS water sample was 1.65 times that of the initial water sample, reaching 521.78mg/L This is because in the sedimentation process, most of the insoluble particles under the action of gravity, to the bottom of the sedimentation column, the lower the horizontal height, the deposition of suspended particles, and most of the organic particles, resulting in a short time of a sharp rise in chemical oxygen demand. After 0.5h, the chemical oxygen demand of water sample decreased slowly, and the decrease range decreased with the extension of precipitation time. The COD concentration of sewage from S125 and S165 sampling sites decreased slowly all the time, and decreased the fastest within 0.5h of settling, and basically remained stable after 2.5h. The COD change trend of rural domestic sewage at sampling sites S5 and S45 was similar, both of which increased sharply in a short period of time and
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