V-type air lift backflow two-stage sedimentation integrated sewage treatment tank

Abstract

The present invention provides a V-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank, wherein the rectangular tank body contains an anaerobic zone, an anoxic zone, an aeration zone, a V-shaped clarifying reflux zone and an inclined pipe / plate precipitation zone, wherein the water surface on the upper portion of a vertical separation wall arranged between the anoxic zone and the aeration zone is provided with a reflux hole, is matchedly provided with an umbrella-shaped stirrer and an auxiliary flow maker, and is further provided with an inclined hole-type gas-water separator, a surface type gas stripping micro power reflux device, an L-shaped hydropower hybrid spiral flow generator and other equipment so as to achieve gas stripping reflux of a nitrification liquid and sludge, and achieve a two-stage precipitation treatment on a mixed solution after a biochemical reaction. The V-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank has a simple and compact structure, and has the following advantages that: denitrogenation, phosphorus removing and precipitation separation are completed in the same tank; and compared with the conventional biochemical reaction tank, the secondary precipitation tank, the coagulation reaction tank and the inclined pipe precipitation tank, the V-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank of the present invention has advantages of low investment, small occupation area, less agent consumption, less sludge discharge, low energy consumption, low cost, stable and controllable water quality, easy operation and management, and the like.

Description

technical field [0001] The present invention relates to an integrated sewage treatment pool, especially utilizing the principle of air lift and the principle of two-stage sedimentation at the same time, and utilizing the ingenious structure of complementary spaces on the upper and lower sides of the V-shaped partition wall to achieve high-efficiency denitrification and phosphorus removal functions and Sewage treatment tank with integrated compact design. Background technique [0002] Conventional sewage treatment methods are mainly biochemical methods, namely activated sludge method and biofilm method. Among them, activated sludge method is the most widely used secondary biological treatment process in various countries in the world. The earlier activated sludge process was mainly to remove organic pollutants, and now it has fully entered the process stage of not only removing organic pollutants, but also removing nitrogen and phosphorus. The principles of activated sludge ...

AI Technical Summary

Problems solved by technology

[0005] Invention patent "Double-sided diversion type biological sewage treatment technology and its sewage treatment equipment" (public number CN 1223972A, public date 1999.7.28), the equipment is composed of buffer tank, aeration tank, sedimentation tank, etc., the equipment is The deep conical bucket shape has insufficient width ratio. Limited by the structural shape and the slope of the cone bottom, not only can it not be enlarged to the commonly used small scale of 100-10,000 tons / day, but it cannot be enlarged to more than 10,000 tons / day. And the equipment can only remove organic pollutants and ammonia nitrogen. Its operating principle determines that it cannot remove nitrogen (total nitrogen) and cannot remove phosphorus. equipment

[0006] Invention patent "Forced reflux double-sided diversion sewage treatment pool" (application number ZL200610125119.7), the pool does not have a chemical dosing device, and the functions of biological and chemical phosphorus removal are insufficient, and it is necessary to add chemicals in the follow-up section. Chemical phosphorus removal; the effluent of the pool is not clear and transparent, so a filter layer is installed at the end of the pool for further filtration. However, the filter layer will be blocked soon during operation, but there is no backwashing device for the filter layer, so it is difficult to remove the blockage. Normal operation; in addition, the pool uses a sludge extraction pipe to suction and discharge sludge, so the energy consumption is high and the sludge discharge effect is poor, and the problem of sludge accumulation at the bottom of the pool is inevitable

There are many defects in this pool, which cannot meet the actual needs of integrated sewage treatment, and can only be used as a unit in a long non-integrated process after modification

[0007] Invention patent application "An integrated device, system and process for sewage biochemical treatment" (publication number CN 102923908A, publication date 2013.2.13), which can basically meet the needs of small-scale sewage denitrification and phosphorus removal of 1500 tons / day and below, However, it is difficult for this device to continue to be enlarged to more than 1600 tons / day, let alone to more than 10,000 tons / day, and the effect of nitrogen and phosphorus removal needs to be further improved

The main reason is that after the device continues to be enlarged, the oblique guide partition will be further extended obliquely upwards, resulting in the sludge farther away lacking horizontal power and difficult to reach the vicinity of the vertical air lift return component, resulting in insufficient sludge return. Problems such as sludge deactivation and floating, anaerobic gas production or death and corrosion brought about in time will seriously affect the water quality of the effluent; at the same time, due to the small size of the device, all one side of the vertical air lift return component is an aerated biochemical zone. There is no pre-anoxic denitrification zone that can use the carbon source of sewage itself, and there is no integrated anaerobic zone. It can only rely on the anoxic denitrification inside the granular sludge and the carbon-deficient post-positioning on the other side of the vertical air lift return module. Anoxic denitrification of the source, so there is room for further improvement in the denitrification effect and phosphorus removal effect; in addition, the chemical flocculation reaction under the sedimentation component is not sufficient and uneven, resulting in a large amount of chemical agent, and the water distribution effect becomes worse after scale-up. Therefore, there is still room for further improvement in the removal of phosphorus and other residual pollutants

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