Biological filtration device

Abstract

The invention discloses a biological filtration device, which comprises a front pool and a biological filtration bed, the front pool comprises an adjustment pool for preliminary sewage treatment, a refluxing pool for receiving refluxed water from the biological filtration bed, a water-outlet sand-filtering pool for filtering the of the refluxed water from the refluxing pool for a second time; an ejector arranged on the ground floor for mixing the refluxed water from the refluxing pool and the sewage from the adjustment pool, and discharging the mixed water into the biological filtration bed; the biological filtration bed comprises a shell, a filling device which is arranged in the shell and is used for treating the sewage, an inlet connected with the outlet of the injector, an outlet connected with the refluxing pool; the biological filtration bed provides an air inlet and an air outlet for ventilation. The device is arranged underground, but the wearing parts are installed on the ground, therefore, the maintenance is convenient, and the device has strong capability to treat wastewater and does not cause sludge blocking.

Description

technical field [0001] This patent relates to a sewage treatment device, especially a biological interception device suitable for sewage treatment in small and medium-sized cities and towns. Background technique [0002] In order to comprehensively treat sewage and implement the basic national policy of energy conservation, emission reduction and environmental protection, the treatment of domestic sewage in small and medium-sized villages, towns and communities has been first carried out in the developed and wealthy eastern regions. For small and medium-sized villages and towns, due to the limitation of investment and management conditions, it is impossible to completely imitate the sewage treatment of big cities in terms of treatment technology and facilities. Only low-cost sewage treatment facilities can contribute to the overall promotion of small and medium-sized sewage treatment projects. [0003] Based on the characteristics of sewage treatment in small and medium-siz...

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Problems solved by technology

The advantage of land treatment is that the system is simple, but it occupies a lot of land, has high risks and harsh conditions

For slow infiltration, it is also limited by climate and plants: water cannot be allocated during the sowing and harvesting periods of autumn and winter crops, so additional storage tanks and enhanced pretreatment facilities must be equipped with sufficient amounts, which require more investment and management. complex

[0007] The above three treatment methods all have different shortcomings. In practical use, it is found that due to the constraints of these shortcomings and the lack of management and technical capabilities of small and medium-sized cities and towns in my country, it is difficult to popularize and promote sewage treatment projects on a large scale. It is urgent to develop a sewage treatment device with simple structure, low investment and strong sewage treatment capacity

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