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Treatment method for wastewater containing high-concentration suspended solids

A treatment method and suspended solids technology, which is applied in the field of high-concentration suspended solids wastewater treatment, can solve the problems of small recovery of pretreatment stone powder, high concentration of sand and gravel wastewater, and high moisture content of mud cakes, and achieves obvious precipitation and concentration effects. The effect of fast speed and stable water quality

Active Publication Date: 2019-09-06
CHANGJIANG SURVEY PLANNING DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) It is currently a commonly used process for wastewater treatment in sand and gravel systems, but there are problems such as small recovery of pretreated stone powder, easy silting of the system, hardening of mud at the bottom of radial flow tanks, high moisture content of mud cakes, and unsmooth operation.
Moreover, the concentration of sand and gravel wastewater is high, the particles are fine, and the D50 will be below 10 μm. At present, there is no effective solution for solid-liquid separation

Method used

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  • Treatment method for wastewater containing high-concentration suspended solids
  • Treatment method for wastewater containing high-concentration suspended solids
  • Treatment method for wastewater containing high-concentration suspended solids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The treatment method of high-concentration suspended matter wastewater comprises the following steps:

[0053] 1) High-concentration suspended solids wastewater is discharged from the waste water collection channel 1 into the first sump 2, and then sent to the primary hydrocyclone 4 through the first water pump 3, and the high-concentration suspended solids wastewater is treated by the primary hydrocyclone 4 Finally, the sediment and overflow liquid are obtained, and the sediment obtained after being processed by the first-level hydrocyclone 4 is sent to the first strong dehydration equipment 5, and the first-level hydrocyclone 4 can be combined with the first strong dehydration equipment 5 to remove ≥ 0.038 mm particles can be reused as stone powder to reduce the load of waste residue treatment at the back end and protect equipment and filter cloth from wear and tear. The moisture content of stone powder dehydrated by the first powerful dehydration equipment 5 can be re...

Embodiment 2

[0060] The treatment method of high-concentration suspended matter wastewater is as in Example 1, wherein the flocculant is a mixture of PAM and CaO in a weight ratio of 1:15.

[0061]The sedimentation recovery rate of the secondary hydrocyclone reaches 47.8%, the particle settling speed of the radial flow sedimentation tank reaches 0.33mm / s, the solid content of the bottom sedimentation mud increases to 37%, the sedimentation and concentration effect is obvious, the effluent water quality is stable and meets the standard, and the high-efficiency diaphragm pressure The working cycle of the filter is stable at 45min to 50min, and the moisture content of the mud cake after pressing is 11%, which meets the conditions for cleaning and transportation, and greatly reduces the volume occupied by the mud cake.

Embodiment 3

[0063] The treatment method of high-concentration suspended matter wastewater is as in Example 1, wherein the flocculant is a mixture of PAM and CaO in a weight ratio of 1:60.

[0064] The sedimentation recovery rate of the secondary hydrocyclone reaches 46.4%, the particle settling speed of the radial flow sedimentation tank reaches 0.31mm / s, the solid content rate of the sedimentation mud at the bottom increases to 36%, the sedimentation and concentration effect is obvious, the effluent water quality is stable and meets the standard, and the high-efficiency diaphragm pressure The working cycle of the filter is stable at 45min to 50min, and the moisture content of the mud cake after pressing is 14%, which meets the conditions for cleaning and transportation, and greatly reduces the volume occupied by the mud cake.

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Abstract

The invention discloses a treatment method for wastewater containing high-concentration suspended solids. The treatment method comprises the following steps of 1, multi-stage hydraulic cyclone pretreatment of the wastewater, wherein the wastewater containing the high-concentration suspended solids is separated by using multi-stage hydraulic cyclone centrifugal force, the solid particles of different sizes are pretreated, overflowing liquid enters the next link, and sediment is recycled; 2, multi-point flocculating settling concentration of the overflowing liquid, wherein the overflowing liquidobtained in the step 1 is introduced into a radical sedimentation basin, a flocculating agent is added into an additive adding pipe of the overflowing liquid at multiple points, by using the naturalvertical turbulent mixing effect of water flow, sufficient and quick mixing of the flocculating agent is achieved, concentrated slurry and supernatant water are obtained, and the supernatant water isrecycled; 3, multiple dehydration of the concentrated slurry, wherein the concentrated slurry obtained in the step 2 is subjected to multiple dehydration, such as direct filter pressing, tympanic secondary squeezing and full-flow high-pressure blowing of filter residues. Efficient solid-liquid separation and quick dehydration of the slurry are achieved, the outlet water quality meets the dischargestandards of the Integrated Wastewater Discharge Standards (GB8978) or the requirements of production recycling, the water content of a slurry cake is low, and the requirements for clean transportation are met.

Description

technical field [0001] The invention relates to a process for treating waste water discharged from a sandstone concrete production system of a large and medium-sized water conservancy and hydropower project, in particular to a treatment method for high-concentration suspended matter waste water. Background technique [0002] In order to ensure the quality of concrete construction in water conservancy and hydropower projects, the sand and gravel production system often adopts wet production. The mud content and powder coating degree of artificial sand and gravel aggregates are controlled within the allowable range by washing with clean water, which will generate a large amount of waste water, and its total suspended The solid concentration (TSS) is generally as high as 30-120kg / m3 or more, and the TSS in the sandstone production system of large-scale water conservancy and hydropower projects generally exceeds 120kg / m3, and the wastewater volume can reach hundreds to thousands ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/12
CPCC02F1/38C02F1/5236C02F1/56C02F11/12C02F11/122C02F2301/08
Inventor 陈雯龙慧文张志胜车公义袁建伟彭伟光温革黄明海黄毅张骏徐翔
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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