Sand-water separation system for efficiently separating sand in sewage and using method

Abstract

The invention provides a sand-water separation system for efficient separating sand in sewage and a using method of the system. The system comprises a folded plate rheological type multidirectional quicksand-water separator treatment unit, a first heterogeneous regenerated sand filter treatment unit and a second heterogeneous regenerated sand filter treatment unit; the folded plate rheological type multidirectional quicksand-water separator treatment unit comprises a tangential water inlet pipe, a water outlet channel, a shell barrel plate, a permeable outer barrel plate, a permeable inner barrel plate, an annular wall inclined plate, a wedge-shaped overflow weir plate, a density flow folded plate, a bottle-shaped plate, a sand locking cover, a sand locking paddle, a sand discharging pump and a circulating valve; and the heterogeneous regenerated sand filter treatment unit comprises a shell, a preset sand filter layer, a sand raking hole, an aeration valve, a turbid liquid outlet, a blower nozzle, a filter valve and a reflux pump. According to the invention, the fluid mechanics principle and innovative optimization design are utilized, the sand leakage phenomenon existing in the traditional sand removal process is eliminated while the sand-water separation effect is improved, and a technical support is provided for stable operation and efficiency improvement of a sewage treatment plant.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sand-water separation system and a use method for efficiently separating sand particles in sewage. Background technique [0002] Municipal sewage often carries a large amount of sand. According to the "Code for Design of Outdoor Drainage (2016 Edition)" (GB50014-2006), the treatment scale of one plant is 10,000m 3 / d's municipal sewage treatment plant receives up to 110m of sand per year 3 , and in the measured data of some sewage plants, the sand content in the sewage may even be several times higher than the design specification. If these sand particles cannot be separated in a timely and effective manner at the source and continue to accumulate in the sewage treatment system, it will have a series of persistent adverse effects on subsequent treatment structures, such as equipment wear, pipeline blockage, sewage treatment tank siltation, etc., seriously ...

AI Technical Summary

Problems solved by technology

[0003] The particle size distribution of sand particles in municipal sewage is wide (usually in the range of 0-300 μm), while the traditional sand removal process is mainly aimed at the removal of sand particles with a particle size greater than 200 μm and a specific gravity greater than 2.65, and the interception of fine sand with a particle size of less than 200 μm The efficiency is low, and there is obvious sand running phenomenon during the secondary separation of sand and water, which leads to low overall sand removal efficiency

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