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Method and device for delayed stirring and coagulating granulation treatment of waste water in high-suspension system

A treatment method and high-suspension technology, which are applied in the field of delayed stirring, coagulation and granulation treatment of wastewater in high-suspension systems, can solve the problems of loss of value in coagulation treatment, poor sludge settling performance, and loose structure, and achieve the treatment cost. Low, easy to operate, strong applicability

Active Publication Date: 2015-05-27
SHAANXI URSTAR ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for high-suspension system wastewater, because it contains a large number of inorganic particles, emulsions and organic colloids with greatly different particle sizes, when it is directly treated by conventional coagulation processes, it will form particles with different sizes and high porosity in the flocculation stage. flocs, and then form loose structure and extremely high water content sludge in the coagulation stage, and the sludge flocs contain light emulsion, which directly leads to extremely poor sedimentation performance of the sludge
Usually, after 1 hour of static settling, the volume of sludge can still be as high as 60-80%, causing the coagulation treatment to lose its due value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, control the crushing strength in the homogenization reaction of high shear field force crushing to 300s -1 , (the rotation speed of the stirring device is about 800r / min), and the duration is 10min. The high-suspension system wastewater is broken by high shear force field to complete the homogenization of the impurity particles in the suspension system.

[0030] Subsequently, the homogenized wastewater enters the coagulation and granulation area; there are three steps in coagulation and granulation:

[0031] In the fast flocculation zone, the stirring intensity of the stirring device is controlled to maintain at 130s -1 , using aluminum salt flocculants, the dosage is controlled at 200mg / L, and the reaction time is 1min, so that the suspended matter in the wastewater can be destabilized and aggregated;

[0032] In the coagulation and granulation area, control the stirring intensity of the stirring device to maintain it at 15s -1 , using cationic polyacrylamide,...

Embodiment 2

[0036] First, control the crushing strength in the homogenization reaction of high shear field force crushing to 350s -1 , (the rotation speed of the stirring device is about 1200r / min), and the duration is 15min. The wastewater in the high suspension system is crushed by high shear force field to complete the homogenization of the impurity particles in the suspension system.

[0037] Subsequently, the homogenized wastewater enters the coagulation and granulation area; there are three steps in coagulation and granulation:

[0038] In the fast flocculation zone, the stirring intensity of the stirring device is controlled to maintain at 150s -1 , the aluminum salt flocculant is used, the dosage is controlled at 80mg / L, and the reaction time is 2min, so that the suspended matter in the wastewater can be destabilized and aggregated;

[0039] In the coagulation and granulation area, control the stirring intensity of the stirring device to maintain it at 20s -1 , using cationic po...

Embodiment 3

[0043] First, control the crushing strength in the homogenization reaction of high shear field force crushing to 315s -1 , (the rotation speed of the stirring device is about 1000r / min), and the duration is 12min. The wastewater in the high suspension system is crushed by high shear force field to complete the homogenization of the impurity particles in the suspension system.

[0044] Subsequently, the homogenized wastewater enters the coagulation and granulation area; there are three steps in coagulation and granulation:

[0045] In the fast flocculation zone, the stirring intensity of the stirring device is controlled to maintain at 140s -1 , using aluminum salt flocculants, the dosage is controlled at 120mg / L, and the reaction time is 1min, so that the suspended matter in the wastewater can be destabilized and aggregated;

[0046] In the coagulation and granulation area, the stirring intensity of the stirring device is controlled to maintain at 18s -1 , cationic polyacryl...

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Abstract

A method for delayed stirring and coagulating granulation treatment of waste water in a high-suspension system comprises the steps as follows: waste water in the high-suspension system is subjected to high shearing force field breakage to finish homogenization of impurity granules in the suspension system; and the homogenized waste water is subjected to delayed stirring and coagulating granulation, that is, firstly, a flocculating agent is added to destabilize and agglomerate suspensoid in the waste water to realize rapid flocculation, secondly, a coagulant aiding agent is added for agglomeration granulation under the proper hydraulic shearing action, and finally, the hydraulic power operation condition is optimized to densify granule sludge formed by agglomeration granulation; and the granule sludge formed in a densification reaction is separated from water easily, so that waste water in the high-suspension system is treated efficiently and rapidly. The invention further provides a corresponding treatment device. The size distribution of impurity granules in the suspension system is changed through high shearing force field breakage, so that granule homogenization is realized, further, coagulating granulation of waste water is performed under the specific coagulating operation condition, densification of sludge granules is completed simultaneously, and the formed sludge granules are high in settling velocity and easy to separate.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment method and device for delayed stirring coagulation granulation of waste water in a high-suspension system. Background technique [0002] High suspension system wastewater refers to the wastewater in which there are a large number of inorganic particles, emulsions and organic colloids with large particle sizes in the water. For this kind of wastewater, the coagulation treatment process is the best choice. This process can remove suspended solids, Colloidal particles and macromolecular organic matter. The process is generally divided into two steps: flocculation and coagulation. Flocculation refers to adding flocculants to the water to interact with fine particles, colloids and dissolved macromolecular substances in the water, changing their surface charge properties to promote the mutual aggregation of such substances. , forming fine particles; ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 金鹏康任武昂王晓昌
Owner SHAANXI URSTAR ENVIRONMENTAL SCI & TECH