Device and method for domestic sewage treatment

Abstract

The invention discloses a device and a method for domestic sewage treatment. The method includes the steps of precipitation digestion, anaerobic reaction, aerobic biological degradation and reprecipitation. The anaerobic reaction performed segmentally includes a hydrolytic acidification segment and two methanogenesis segments, so that different microorganisms give full play to pollutant degradation capabilities in respective suitable environemts, particularly, corresponding spatial environments are provided for different methanogens, and conditions are created for respective advantage growth. In the aerobic biological degradation step, biological membranes are attached to thin-layer water to contact with air sufficiently, and absorption of oxygen in the air is strengthened. During large sewage quantity, the aerobic biological membranes contact with the air and sewage alternately; and during small sewage quantity, the thin-layer water on the surfaces of the biological membranes contacts with the air continuously. Compared with the prior art, the device for domestic sewage treatment has the advantages of optimized spatial arrangement of function units, compact structure, good sewage treatment effect, no energy consumption, avoidance of personnel operation, high process space utilization rate and occupied area saving.

Description

technical field [0001] The invention relates to a water treatment technology, in particular to a domestic sewage treatment method and device suitable for industrial, mining, enterprises, and residential areas in remote, underdeveloped, and low-level technical management areas. [0002] Background technique [0003] With the intensification of water environmental pollution, the control of water environmental pollution not only depends on the continuous improvement of urban sewage treatment facilities, but also depends on the sewage treatment in areas that cannot be covered by urban drainage pipe networks and sewage treatment plants, and the treatment of vast remote areas and scattered domestic sewage It is gradually becoming an important aspect of water pollution control. However, for remote areas, the economy is underdeveloped, the level of technical management is low, and domestic sewage has the characteristics of large water volume changes and good biodegradability, e...

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Problems solved by technology

Chinese patents 00220184.4 and 201010139475.0 respectively disclose a domestic sewage treatment device, in which the aerobic process uses the water surface to communicate with the atmosphere to naturally dissolve oxygen. This method will not obtain good water surface area in contact with the atmosphere. Effect; Patent No. 201110226475.9 discloses a method of dissolving oxygen and increasing oxygen in sewage by spraying sewage from the water distribution pipe in the flowing air. Although this method is better than the natural oxygen dissolution effect on the water surface, the oxygen dissolution process depends on the size of the water droplet from the water distribution pipe. The smaller the outlet water droplet, the better the effect, but the smaller the droplet requires the smaller the outlet hole diameter of the water distribution pipe, which will inevitably require more water distribution pipes and a larger water distribution area to meet the requirements of the specified flow rate. In addition, the outlet hole of the water distribution pipe The small hole diameter is easy to cause the hole of the water distribution pipe to be blocked

For the anaerobic + aerobic combined process, in addition to the aforementioned problem of how to increase the dissolved oxygen in water without power, the consideration of the optimal layout of the relevant functional unit space is generally insufficient, and the spatial distribution of each functional unit is scattered. The process area is generally large

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