Sequencing batch type static state deposition method and system

Abstract

The invention relates to a sequencing batch type static sedimentation method and a system thereof, wherein the method comprises the following steps: at the first static sedimentation pond water intake and decanting stage, under the hydraulic action, the supernatant is lifted layer by layer, is overflown and discharged by a water outlet weir of an air weir water decanting machine; when the replacement ratio of the supernatant to earth water mixed liquid reaches the set value, and the first static sedimentation pond water intake and decanting stage ends; the reaction stage starts, wastewater after pre-treatment or biochemical treatment is subjected to re-treatment, and the reaction stage ends when the preset reaction time achieves, the first static sedimentation pond enters the static sedimentation stage, sludge is freely settled in static current, and the static sedimentation stage ends when the preset static sedimentation time achieves; and while the first static sedimentation pond enters the reaction stage, the water intake and decanting stage of a second static sedimentation pond starts, and actions in the first static sedimentation pond are repeated. The whole sedimentation process is completed by the sequencing batch type static sedimentation system formed by at least two static sedimentation ponds, thereby overcoming the defects existing in the dynamic sedimentation mode and having the advantages of strong practicability, high sedimentation efficiency, convenient operation and maintenance, compact structure, high land use rate and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sequencing batch static precipitation method and a system thereof. Background technique [0002] At present, traditional types of sedimentation tanks are commonly used in sewage treatment systems, such as horizontal flow sedimentation tanks, vertical flow sedimentation tanks, radial flow sedimentation tanks, and sedimentation tanks designed according to the principle of shallow layers, all of which are designed and implemented in the dynamic flow mode Yes, that is, the sedimentation tank enters water, settles and discharges water at the same time. In this way, the sedimentation efficiency of the sludge is inevitably affected by the inflow and outflow and the rising water flow, the sedimentation distance of the sludge is compressed, and the sedimentation time is prolonged, which increases the volume of the sedimentation tank accordingly; for the secondary sedimentation ...

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Problems solved by technology

In this way, the sedimentation efficiency of the sludge is inevitably affected by the inflow and outflow and the rising water flow, the sedimentation distance of the sludge is compressed, and the sedimentation time is prolonged, which increases the volume of the sedimentation tank accordingly; for the secondary sedimentation tank, concentration The sludge should be returned to the main reaction tank, and the design of the secondary settling tank should fully consider the influence of sludge backflow on the settlement effect. Therefore, when designing the secondary settling tank, a longer settling time and a smaller surface load should be selected. , which also increases the volume of the sedimentation tank accordingly

Although the continuous improvement of the radial flow sedimentation tank has reduced the influence of the water flow on the sludge settlement effect to a certain extent, its complex structure is not conducive to operation and maintenance, and the high cost is also the reason for many sewage treatment plants. Problems that cannot be ignored in the selection of structures

[0003] Secondly, the function of the traditional sedimentation tank is relatively simple, mainly used for the sedimentation, concentration and return of sludge, and does not have the function of finely adjusting the quality of the effluent water; in the layout of the structure, the sedimentation tank is generally a separate structure and the effective water depth It is not high and occupies a large area, so it is not suitable for areas with tight land resources

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