Rural domestic sewage treatment fixed filler multi-bed oxidation ditch

Abstract

The invention discloses a rural domestic sewage treatment fixed filler multi-bed oxidation ditch which comprises an annular shell. An oxidation ditch body is formed by the annular shell, a water inlet pipe is arranged on the annular shell, mounting holes are formed along the circumference of the annular shell at intervals, and liftable placement barrels are inserted into the mounting holes. The liftable placement barrel is filled with filler and / or an aeration device, a plurality of water passing holes are formed in the surface of the liftable placement barrel, a water outlet barrel is inserted into one mounting hole, a water inlet pipe and a water outlet pipe are arranged on the water outlet barrel, the aeration device is communicated with an aeration pipeline, and the aeration pipeline is connected with a draught fan. The device is safe and convenient to maintain, and the organic matter removal and biological nitrogen and phosphorus removal efficiency is enhanced.

Description

technical field [0001] The invention relates to the field of rural domestic sewage treatment, in particular to a buried oxidation ditch for treating rural domestic sewage. Background technique [0002] The existing rural sewage treatment plans for nearly 3,000 counties and districts have basically been compiled, and 70% of them have adopted underground centralized sewage treatment devices. One sewage treatment station is set up for each village, generally 5-50 tons. The entire national plan is about Invest 3 trillion yuan. [0003] At this stage, the main difficulty in the treatment of rural domestic sewage lies in the unstable flow throughout the day. In the morning, noon and evening, less than 4 hours, 20 hours of water is discharged, and the proportion of sewage discharge occupies 50%-80% of the water. The impact resistance is required to be high, and adjustment pools and pumping stations are required, and the cost of soil construction and equipment is high. [0004] Ja...

AI Technical Summary

Problems solved by technology

[0005] Since China does not have a mature rural sewage design specification, referring to the urban sewage design specification, the high-load biological treatment method represented by the activated sludge method is still used, and the general residence time is no more than 8-16 hours, while a natural village, rural sewage The treatment capacity is about 5-50 tons, the scale is small, and because the rural residents are widely dispersed, some of them are located in hilly and mountainous areas, so it is impossible to implement rain and sewage diversion. When it rains, the impact load is large, and the bacteria in the activated sludge method will be lost in large quantities. , Small-scale rural sewage cannot operate normally with the activated sludge method, the discharge exceeds the standard, and the effect is worse than the in-situ ecological method. This is one of the fundamental reasons why China still cannot improve the river course after the activated sludge method is used to treat rural sewage.

[0006] Each county has a population ranging from 500,000 to 2 million, and almost 200 to 1,000 sewage treatment stations are needed. If the ordinary activated sludge method is used, a large amount of labor maintenance costs are required

[0007] Moreover, the filler in the existing oxidation ditch shell is directly filled into the shell, and the flow type filler is used. When the rainwater impacts, the biofilm (bacteria film) on the surface of the filler is easily washed away, and the biological treatment function of the contact oxidation method is lost, and When the filler has reached the end of its service life, it needs to be manually removed and replaced, which is difficult to repair. At the same time, a large amount of ammonia and biogas will be generated after the biochemical reaction of rural sewage, which is likely to cause personnel accidents and needs to be improved.

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