Rural domestic wastewater treatment method and apparatus thereof

Abstract

The invention discloses a rural domestic wastewater treatment method. The method comprises the following steps: settling wastewater to be treated, taking a part of the water and all mud, and carrying out pre-anoxic treatment until the dissolved oxygen concentration is less than 0.2 mg / L; mixing with the remaining water, and carrying out anaerobic treatment until the dissolved oxygen concentration is less than 0.2 mg / L; carrying out anaerobic treatment under the action of denitrifying bacteria until the dissolved oxygen concentration is 0.2-0.5 mg / L; and carrying out aerobic treatment. The invention also provides a corresponding treatment apparatus. The apparatus comprises a first settlement pool, a first pool body, a second water pipe, a second pool body, a third pool body, a fourth pool body, a first riser tube, a second riser tube, a second settlement pool, a fan and a collection tank. The quality of rural domestic wastewater treated through the method is good; and the apparatus has the advantages of good biochemical treatment effect, low device investment, low treatment cost of per ton of water, simple structure, convenience in manufacturing, and reliable performances, and is an integral sewage treatment apparatus.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a rural domestic sewage treatment method and a device thereof. Background technique [0002] At present, the main sources of rural domestic sewage are washing, toilet flushing, bathing, kitchen sewage, etc., which have the characteristics of wide discharge area, dispersion, low pollution concentration, and low treatment rate; they seriously pollute the water environment in rural areas, and the quality of drinking water is affected. serious threat. Therefore, it is an urgent problem to improve the current living environment in rural areas to choose appropriate sewage treatment technology and strengthen the collection, treatment and discharge of rural domestic sewage. [0003] The current common treatment technologies for rural domestic sewage are as follows: [0004] 1) Anaerobic method: [0005] That is, an anaerobic biological filter is used. Anaerobic microorganisms can degr...

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Problems solved by technology

[0007] Disadvantages: The filter is easy to block, especially at the bottom, so it is mainly suitable for the treatment of dissolved organic wastewater with low concentration of suspended solids; it has higher requirements for water distribution devices

[0011] Disadvantages: the installation and maintenance of equipment are more complicated; the biofilm is too thick, and some fillers are easy to block

[0015] Disadvantages: low utilization rate of reactor volume; low utilization rate of equipment; high peak oxygen demand, low utilization rate of oxygen in the whole system

Disadvantages: To improve the denitrification efficiency, the internal circulation ratio must be increased, thus increasing the operating cost

The disadvantage is that the influent water quality requirements: BOD 5 ≤80mg / L; TN≤25mg / L; TP≤4mg / L

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