Sand discharge method and sand discharge system of cyclone grit chamber

Abstract

The invention provides a sand discharging method and system for a rotational-flow grit chamber. The system comprises a plurality of sensors, at least one warning line, a data acquisition unit, a signal transmission unit, a control unit and a control execution unit, wherein: the warning line is arranged on the side wall of a sand hopper of the rotational-flow grit chamber, different warning lines have a different height relative to the bottom of the sand hopper; the sensors are arranged on the side wall of the sand hopper and are used to measure the distance between sandstone in the sand hopperand the warning lines; data measured by the sensors is collected by the data acquisition unit and is transmitted to the control unit through the signal transmission unit, and the control unit sets asand discharging condition, wherein the sand discharging condition is that the quantity of the distance between the sandstone in the sand hopper and the warning lines being less than a safety threshold value reaches a set number. When the sand discharging condition is achieved, the control unit sends an instruction to the control execution unit to perform sand discharging. The above system and method realize automatic discharging of sand, and are convenient, fast and highly reliable.

Description

technical field [0001] The invention relates to the technical field of grit chamber sand discharge in sewage treatment, in particular to a sand discharge method and a sand discharge system for a swirl grit chamber. Background technique [0002] Sewage will inevitably be mixed with mud and sand in the process of migration, flow and collection. If the sand in the sewage is not pre-sedimented and separated, it will affect the operation of the subsequent treatment equipment. The most important thing is to wear the machine pump, block the pipe network, interfere or even destroy the biochemical treatment process. The grit chamber is mainly used to remove sand particles with a particle size greater than 0.2mm and a density greater than 2.65t / m3 in sewage, so as to protect pipelines, valves and other facilities from wear and blockage. [0003] At present, there are basically two types of grit chambers in urban sewage treatment plants: one is the aerated grit chamber, which is wide...

AI Technical Summary

Problems solved by technology

[0004] However, in the current sewage treatment process, the sand volume in the grit chamber is not monitored and discharged. Usually, the operator performs a sand discharge operation at regular intervals based on past experience.

Due to the changes in the amount and concentration of sewage in different time periods, if the amount of sand settling cannot be accurately known and the sand is discharged in time, it is easy to cause blockage or even overflow of sand and gravel, which will affect the normal treatment of sewage

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