Method for treating sewage by modified settling agent strengthening flocculation/coagulation

A settling aid and modification technology, applied in the field of water supply and drainage technology and environmental protection, can solve the problems of low adsorption efficiency of quartz sand aid and poor adsorption capacity on particle surface, and achieve improved adsorption and capture capacity and fast settling speed. , strong adsorption effect

Inactive Publication Date: 2011-01-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low adsorption efficiency of quartz sand sedimentation aid and poor parti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1: Flocculation / coagulation treatment of an industrial wastewater A containing fine suspended solids.

[0030] Pretreatment of the quartz sand aid settling agent. The quartz sand sedimentation aid with a particle size of 300 mesh to 200 mesh is soaked in a 1% concentration of organic polymer flocculant solution for 15 minutes, and the mass volume ratio of the quartz sand to the organic polymer flocculant solution is 3kg / 10L.

[0031] Put the new settling aid and flocculation / coagulant into sewage, and the ratio of the amount of quartz sand to the sewage is 10kg / t water. Stir slowly for 3 minutes, and control the speed at 30r / min.

[0032] Use this sedimentation aid in combination with flocculation / coagulant, add this sedimentation aid in the early stage of sewage flocculation / coagulation, the hydraulic retention time of sewage in the sedimentation tank is 30 minutes, and the removal rate of suspended matter is 98.7%.

Example Embodiment

[0033] Example 2: Flocculation / coagulation treatment of a certain mineral processing wastewater B containing fine suspended matter.

[0034] Pretreatment of the quartz sand aid settling agent. The quartz sand with a particle size of 200 mesh to 100 mesh is soaked in an organic polymer flocculant solution with a concentration of 0.1% for 3 minutes, and the mass volume ratio of the quartz sand to the organic polymer flocculant solution is 5 kg / 10L.

[0035] Put the new settling aid into the beneficiation wastewater, and the ratio of the amount of quartz sand added to the waste beneficiation water is 10kg / t water. Stir slowly for 10 minutes, and control the speed at 80r / min.

[0036] Use this settling aid in combination with flocculation / coagulant, and add this settling aid in the later stage of flocculation / coagulation. The hydraulic retention time of beneficiation wastewater in the sedimentation tank is 50 minutes, and the removal rate of suspended solids is 97.1%

Example Embodiment

[0037] Example 3: Flocculation / coagulation treatment of a certain domestic sewage C containing fine suspended solids. Pretreatment of the quartz sand aid settling agent. The quartz sand with a particle size of 300 mesh to 200 mesh is immersed in a 0.5% organic polymer flocculant solution for 30 minutes, and the mass volume ratio of the quartz sand to the organic polymer flocculant solution is 3kg / 10L.

[0038] Put the new settling aid and flocculant into domestic sewage, and the ratio of the amount of quartz sand to the sewage is 2kg / t water. Stir slowly for 2.5 minutes, and the speed is controlled at 50r / min.

[0039] Use this sedimentation aid in combination with flocculation, add this sedimentation aid in the middle of flocculation, the hydraulic retention time of sewage in the sedimentation tank is 30 minutes, and the removal rate of suspended matter is 99.2%

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Abstract

The invention discloses a method for removing impurities such as suspended matters and colloids and the like in water by adding a modified settling agent by the action of flocculating/coagulating sedimentation, and belongs to the technical field of water supply and drainage technology and environmental protection technology. The method comprises the following steps of: soaking the settling agent of silica sand particles with the grain size of 50 to 300 meshes in 0.1 to 5 percent solution of organic macromolecular flocculant/coagulant for 0.5 minutes to 48 hours, wherein the surface of the soaked silica sand is coated with and adsorbs a layer of molecular long chains of the organic macromolecular flocculant/coagulant; putting the treated particles of settling agent into the water to be treated at proper time, and slowly stirring the mixed solution for 0.5 to 30 minutes, wherein the rotary speed is controlled to 20 to 100r/min, so that the pretreated particles of settling agent are fully contacted with the suspended matters in the sewage; and stopping stirring, standing for sedimentation for 1 to 60 minutes and performing solid-liquid separation so as to remove the suspended matters in the sewage by coagulation efficiently. The method has the advantages of high capturing capability of the settling agent, stable structure of floccules, low water content, quick settlement of floccules and good treating effect, and can obviously reduce the using amount of the flocculant/coagulant or improve the flocculation/coagulation effect.

Description

technical field [0001] The invention relates to a treatment method for removing impurities in water, in particular to a treatment method for removing impurities such as suspended solids and colloids in water by adding a modified settling aid and using flocculation / coagulation precipitation, and belongs to the technical fields of water supply and drainage and environmental protection. Background technique [0002] Flocculation / coagulation is to change the surface characteristics of colloidal particles by adding chemicals, so that dispersed colloidal particles aggregate to form large particles and precipitate (or float). The main mechanism of action is: electrical neutralization / adsorption, adsorption bridging , Volume sweep flocculation, etc. In today's water treatment flocculation / coagulation process, adding appropriate sedimentation aids according to needs can often improve the flocculation / coagulation effect and reduce the settling time. [0003] According to the material...

Claims

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Application Information

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IPC IPC(8): C02F1/56
Inventor 徐晓军陈映雪白荣林李新征安正阳罗发生
Owner KUNMING UNIV OF SCI & TECH
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