Adjustable self-flowing diffluence type ring-shape oxidization trench

Abstract

The invention provides a branching ring type oxidation ditch with adjustable gravity flow. The interior of the invention is an O type anaerobic zone, the exterior is an O type aerobic zone and the middle part is a C type anoxic zone. The intersection zone of a C type nick and the O type aerobic zone is a mixing zone, wherein, the radian of a C type circular arc separating wall that forms the anaerobic zone is 246 degrees, the length of the C type circular arc separating wall that stretches into the mixing zone is 0.41R and the R is the radius of a concentric circle separating wall of the aerobic zone, the angle Alpha at a starting end point of the C type circular arc separating wall that can be adjusted is equal to 10 degrees- 107 degrees and the alpha is an included angle formed by a line connecting the starting end point and the center of the C type circular arc separating wall and an adjustable branching wall. The structure can weaken the turbulence in the ditch, increase the volume occupancy of the plug-flow fluid in the ditch, promote the efficiency of a reactor, prolong the stopping time at the aerobic zone and the anoxic zone, decrease the stopping time at the mixing zone and the occupancy of a dead zone and leave out the energy consumption caused by a mechanical stirrer. Besides, the returning flow that enters into the aerobic zone and the anoxic zone can be flexibly adjusted and controlled based on different water quality, so as to gain stable nitrogen and phosphors removal effect that fully meets the discharge standards of the state.

Description

technical field [0001] The technology of the invention belongs to the technology of sewage treatment, and in particular relates to an oxidation ditch for sewage treatment. Background technique [0002] In the study of reaction technology for sewage treatment, reactor design is also becoming more and more important, because the development of a reaction technology depends on the determination of the reactor form and the determination of the hydrodynamic characteristics of these forms. In sewage treatment, reactor types can be divided into four categories according to the reactor operation mode and flow pattern: batch reactor (BR), continuous stirred tank reactor (CSTR), plug flow reactor (PFR) and stage Formula CSTR. According to the principle of the reactor, in the above four reactors, the downtime of BR reduces its removal rate; CSTR is a completely mixed flow pattern, and the concentration gradient in the reactor is poor, which reduces the reaction efficiency; the PFR rea...

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Problems solved by technology

[0004] However, it has been found through use that the treatment effect of OCO oxidation ditch still has the following shortcomings: ①The residence time of sewage in the aerobic zone 13 and anoxic zone 12 is insufficient, which weakens the effect of denitrification and phosphorus removal; ②It is necessary to use a mechanical agitator to control and adjust the return The flow rate is not easy to operate and increases the energy consumption of the system. At the same time, turbulence and back-mixing are formed in the reactor, which affects the reaction efficiency;

However, in the experimental research, it was found that this technology still has some deficiencies: 1. It failed to further reduce the degree of turbulence in the mixing zone, which affected the improvement of the volume utilization rate of the push flow state; 2. The turbulent collision between the liquids in the mixing zone reduced the The circumferential driving force of the fluid inertia makes the velocity of the inner wall side of the mixing zone too small, so that there is still a certain dead zone in this zone, thereby reducing the effective volume utilization rate of the oxidation ditch; 3. The residence time of the anoxic zone and the aerobic zone Still not enough to meet the requirements of efficient nitrogen and phosphorus removal

4. The flexibility and adaptability of the movable diversion wall of the concentric circle movable diversion wall loop reactor are still not enough

The key reason is that although it was found in the previous research that appropriately extending the curvature of the C-shaped partition wall is beneficial to the improvement of the nitrogen and phosphorus removal effect, a key value of the curvature has not been found, that is, when the curvature of the C-shaped partition wall reaches how many degrees, It can make the process have the flow state and residence time conditions required for the best denitrification and phosphorus removal effect, and at the same time, it does not affect the adjustment of the mixed liquid flowing back into the anoxic zone and the aerobic zone

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