Novel siphon type water decanter, SBR and control method of novel siphon type water decanter

Abstract

The invention discloses a novel siphon type water decanter, an SBR and a control method thereof. The novel siphon type water decanter comprises an annular space drainage channel, a conical surface confluence chamber, an air valve, a U-shaped pipe and a drainage pipe. The annular drainage channel comprises an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder form an annular drainage space, and the top of the annular drainage channel is connected with a confluence weir; the conical confluence chamber comprises a circular confluence weir and a conical structure, the periphery of the circular confluence weir is connected with the inner cylinder, and the bottom of the conical structure is connected with the outer cylinder; the air valve is connected with the top of the conical structure; one end of the U-shaped pipe is connected with the central bottom of the circular confluence weir; the water decanter is small in size, light in weight, convenient to install on site and uniform and stable in water decanting process, the water decanter is always kept in a horizontal state, and in the whole process, activated sludge and sewage which is not subjected to biochemical treatment cannot flow out of the circular confluence weir, so the quality of discharged water cannot be influenced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a novel siphon decanter, an SBR reactor and a control method thereof. Background technique [0002] The SBR method, the full name of the sequencing batch activated sludge method, is the initial mode of sewage biological treatment method. Due to the complexity of switching between inlet and outlet water, variable water level outlet and equipment, its application and development are limited. With the development and application of computer and automatic control technology and related equipment, SBR method is more and more widely used in domestic sewage treatment and various organic industrial wastewater treatment. The SBR method is different from the traditional activated sludge method. It is characterized by spatial push flow in the flow state and organic matter degradation. The SBR method is a completely mixed type in the flow state. In terms of organic matter degradatio...

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Problems solved by technology

[0007] The decanter used in the SBR biochemical reactor can be divided into five types: the first type is the electric mechanical rocker decanter, the second type is the sleeve decanter, the third type is the siphon decanter, The fourth type is a rotary decanter, and the fifth type is a buoy type decanter. Among them, the first, fourth, and fifth types are powered decanters, and the powered decanters require mechanical transmission due to their rotating parts. Therefore, it is prone to failure during use, and the cost is high; the second type of sleeve decanter is prone to the phenomenon that the pipe sleeve is stuck and cannot work normally; the third type of siphon decanter, this form of decanter is Developed by the Australian AAT company in the mid-1980s and began to be applied to the SBR process, the decanter is mainly divided into three parts: multiple short drainage pipes, horizontal weir arms, U-shaped pipe parts and main drainage pipes, which are easy to maintain, The advantages of low operating costs and saving infrastructure costs, but high processing accuracy is required, and the method of multi-pipe and multi-point water intake is adopted. Due to the different resistance of the pipes, the flow of each water inlet is uneven, and the water near the main pipe and the outlet pipe is large, and vice versa. The amount of water is small; in addition, the water inlets are distributed in multiple points on the horizontal plane, the decanter takes up a lot of space, the installation is difficult, and it is not conducive to the maintenance of the aeration system at the bottom of the reactor. It is rarely used in China, and it is necessary to improve it

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