Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank

Abstract

The present invention provides a Z-shaped gas stripping reflux two-stage precipitation integrated sewage treatment tank, wherein the rectangular tank body contains a grid-containing sand settling pretreatment zone, an anoxic zone, an aeration zone, a clarifying reflux zone, an inclined pipe / plate precipitation zone, a contact disinfection ditch, and the like, and conventional water treatment equipment, a horizontal slit-type gas-water separator, a Z-shaped separation wall, a surface type gas stripping micro power reflux device arranged in a horizontal and completely-paving manner, and an L-shaped hydropower hybrid spiral flow generator are arranged inside the tank body. The Z-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, two stage precipitation and disinfection treatment are completed in the same tank; and compared with the conventional process adopting a plurality of independent small tanks, the Z-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, and is especially suitable for sewage denitrogenation and phosphorus removing integrated treatments with a scale of 10000 tons / day and below.

Description

technical field [0001] The 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 between the upper and lower sides of the Z-shaped partition wall to realize high-efficiency denitrification and phosphorus removal functions and integration Sewage treatment tank in 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 deni...

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Problems solved by technology

[0003] For small and medium-scale sewage treatment, the invention patent "Double-sided diversion biological sewage treatment technology and sewage treatment equipment" (public number CN 1223972A, public date 1999.7.28), the equipment consists of buffer tank, aeration tank, sedimentation tank etc., the equipment is in the shape of a deep cone with insufficient width ratio, limited by the structural shape and the slope of the cone bottom, not only cannot be enlarged to the commonly used small scale of 100-10,000 tons per day, but also can only remove organic pollutants and Ammonia nitrogen, the operating principle of this equipment determines that it cannot remove nitrogen (total nitrogen) and cannot remove phosphorus. The nitrogen and phosphorus indicators of the effluent water quality do not meet the current national discharge standards in my country, so it is not a sewage nitrogen and phosphorus removal equipment.

[0004] 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 to continue to scale up the device, 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 the sewage itself, and it can only rely on the anoxic denitrification inside the granular sludge and the anoxic denitrification that lacks carbon sources on the other side of the vertical air lift reflux module, so denitrification There is still room for further improvement of the nitrogen effect; in addition, the flocculation reaction of the agent under the sedimentation component is not sufficient and uneven, resulting in a large amount of agent, and the effect of water distribution becomes worse after the scale is enlarged, so the effect of phosphorus removal and other residual pollutants removal is still weak. room for further improvement

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