High-reliability air draining weir

Abstract

The invention discloses a high-reliability air draining weir which comprises a water collection groove with an outlet pipe. An end portion of the water collection groove is provided with a weir plate. A cover cap is arranged above the water collection groove. A cavity is formed between the cover cap and the water collection groove. The cover cap is provided with an exhaust pipe, an air inlet pipeline and a pressure relief pipe which are connected with the cavity. The structure of the high-reliability air draining weir provided by the invention is simple and exquisite. During the practical operation process, stability of the system is raised, and pressure in the cavity is basically stable so as to prevent a mud-water mixed liquid from flowing out through an air effluent weir due to air pressure instability. Excess gases are discharged by the utilization of the pressure relief pipe; it is ensured that gases do not leak out from two sides of the cover cap so as to make the cover cap stable; the settling effect of an MSBR tank and sealing performance of the cover cap are effectively guaranteed; siphonage is effectively avoided; and meanwhile, normal operation and settling effect of the MSBR system are guaranteed.

Description

technical field [0001] [0002] The invention is mainly used in the MSBR process system for sewage treatment, and in particular relates to a highly reliable air drainage weir with controllable and quantitative drainage after the mud and water are separated in the SBR pool. [0003] Background technique [0004] [0005] MSBR (Modified Sequencing Batch Reactor) is an improved sequential batch reactor, which is a more ideal sewage treatment system researched and developed based on the characteristics of SBR technology and combined with traditional activated sludge technology. MSBR does not require primary and secondary settling tanks, and can operate continuously when the reactor is fully filled and at a constant liquid level. It adopts a single-tank multi-cell method, combining the advantages of traditional activated sludge method and SBR technology . Not only is there no need for intermittent flow, it also eliminates the need for more connecting tubing, pumps and valves ...

AI Technical Summary

Problems solved by technology

[0008]2. Due to the influence of impurities such as sludge and fibrous substances in the sewage on the liquid level control and detection devices such as float switches or electrodes, it is easy to make the intake valve unable to In addition, when the other air weirs in the system are drained, a large amount of air entrained is released and the aeration process makes the air continue to enter the cavity of the weir body, the cavity is over-pressurized, and the excess gas escapes from both sides of the cover. Severe turbulence caused by the cover body swings to both sides, which will easily lead to the failure of the seal of the weir body and shorten the service life of the air cover. The gas escaping from both sides of the outlet weir will stir the surrounding water body and affect the sedimentation effect of the MSBR tank

Due to the limitation of the exhaust pipeline, enough air cannot be replenished in time, resulting in negative pressure in the air weir, the air volume taken away by the continuous water outlet and the air volume replenished are seriously out of balance, the pressure of the air outlet weir drops sharply, and finally a siphon is formed. As a result, the effluent volume will increase sharply, and the effluent flow rate will become extremely unstable, which will eventually cause disturbances in the water body, affect the deposited sludge, and even take away part of the activated sludge, thereby affecting the effluent water quality and seriously affecting the normal operation of the MSBR system.

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