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A kind of dredging residual water treatment method and treatment device

A treatment method and technology of treatment device, which are applied in water/sewage treatment, water treatment parameter control, water/sewage multi-stage treatment, etc., can solve problems such as difficult to achieve, no treatment of dredging residual water, etc., and achieve a simple system structure, The effect of easy automatic control and short operation cycle

Active Publication Date: 2022-02-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent (CN104310641A) discloses a method for deep phosphorus removal in low-phosphorus water. The method uses modified coral sand as a crystal seed, and through primary fluidized bed crystallization and secondary fixed bed crystallization, the secondary The concentration of phosphorus in the effluent is reduced from 0.6 to 2.4mg / L to less than 0.2mg / L, and the phosphorus in the sewage is recovered in the form of crystallization product HAP, but this method requires a reaction time of more than 10h, which is in the dredging of residual water. It is obviously difficult to achieve in processing
[0005] In conclusion, so far, there has been no report on an effective technical method for the treatment of dredged residual water, which can meet the relevant discharge standards and effectively recover the N and P in it at the same time.

Method used

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  • A kind of dredging residual water treatment method and treatment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1 was carried out at a dredging site for comprehensive management of the water environment in a certain river basin, and the remaining dredged water came from the dredged sediment stockpile. The processing scale of the experimental device is 2m 3 / h, the diameter of the inner cylinder is 0.5m, the height is 3m, the diameter of the outer cylinder is 0.7m, and the height is 4m. The heights of the crystallization zone 102 and the coagulation zone 103 of the inner cylinder are 1 m and 2 m respectively, corresponding to a hydraulic retention time of 5 min and 10 min. The heights of the outer cylinder pH adjustment zone 201, solid-liquid separation zone 202, sludge settling zone 203 and sludge concentration zone 204 are 0.3m, 0.2m, 3m and 0.5m respectively. Mg 2+ The dosage is 20 mg / L, and the pH values ​​of the crystallization zone 102 and the coagulation zone 103 are controlled at 9.5 and 11, respectively. The pH value of the pH adjustment zone 201 is controll...

Embodiment 2

[0061] Embodiment 2 is carried out at the environmental protection dredging site of polluted sediment of a plateau lake, and the difference from Embodiment 1 is. Dredged residual water SS is 1240mg / L, NH 3 -N is 4.2mg / L, TP is 2.8mg / L, where PO 4 3- Form P was 2.3 mg / L. Mg 2+The dosage is 30 mg / L, and the pH values ​​of the crystallization zone 102 and the coagulation zone 103 are controlled at 9.5 and 11.5, respectively. The pH value of the pH adjustment zone 201 is controlled at 8.0. The stirring speed of the mixer 4 is 100 rpm. The crystallization zone 102 and the coagulation zone 103 correspond to hydraulic retention times of 6 min and 14 min.

[0062] During the experiment, the device effluent SS was stable below 40mg / L, NH 3 -N is stable below 1.6mg / L, and TP is stable below 0.15mg / L, both of which meet the secondary standard of the local comprehensive sewage discharge standard, of which SS and TP can also meet the primary standard. crystallization zone to PO 4 ...

Embodiment 3

[0064] Embodiment 3 was carried out at the environmental protection dredging site of a black and odorous water body. The difference from Embodiment 1 is that the dredged residual water first passed through the natural settlement of the sludge dump, and the SS was 580mg / L, and the NH 3 -N is 2.8mg / L, TP is 1.6mg / L, where PO 4 3- Form P was 1.2 mg / L. Mg 2+ The dosage is 20 mg / L, and the pH values ​​of the crystallization zone 102 and the coagulation zone 103 are controlled at 8.5 and 10.5, respectively. The pH value of the pH adjustment zone 201 is controlled at 8.5. The stirring speed of the mixer 4 is 100 rpm.

[0065] During the experiment, the device effluent SS was stable below 20mg / L, NH 3 -N is stable below 1.0mg / L, and TP is stable below 0.1mg / L, both of which meet the secondary standard of the local comprehensive sewage discharge standard, of which SS and TP can also meet the primary standard. crystallization zone to PO 4 3- The recovery rate of form P is above ...

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Abstract

The invention discloses a dredging residual water treatment method. Magnesium salt is added to the dredging residual water to generate MAP molecular clusters. The treated residual water is passed into a fluidized bed, and the residual water passes through the crystallization area of ​​the fluidized bed. When , in the crystallization zone, due to the forced stirring and high-concentration sediment induction, the MAP molecular clusters and some destabilized sediment particles undergo rapid forced reunion and crystallization, and the crystallization product MAP with the sediment particles as the core is formed. The particle size of the crystallization product is After increasing, it sinks to the product concentration area, concentrates and discharges to realize the resource utilization of nitrogen and phosphorus. The invention also discloses a treatment device for realizing the above dredging residual water treatment method. The present invention can realize the synchronous removal of suspended solids and nitrogen and phosphorus in dredging residual water, and recover part of the nitrogen and phosphorus in a highly integrated and easy-to-automatic control device and method, and the NH 3 ‑N and P removal effect is stable, occupying a small area, especially suitable for dredging residual water treatment.

Description

technical field [0001] The invention belongs to the technical field of dredging residual water treatment, and in particular relates to a dredging residual water treatment method and a treatment device. Background technique [0002] Environmental protection dredging is the main engineering measure for water eutrophication control and black and odorous water treatment. The water content of the dredged mud water produced in the environmental protection dredging process is as high as 95%, and a large amount of dredged residual water will be generated after solid-liquid separation. In the polluted sediment dredging and pumping unit, the pollutants in the solid phase of the sediment will diffuse into the water on a large scale, resulting in the dredged residual water often having high suspended solids (SS), high ammonia nitrogen (NH 3 -N) and high phosphorus (P) salient features, in typical engineering examples, even after the natural settlement of the dredged sediment dump, SS, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/16C02F101/10
CPCC02F9/00C02F1/58C02F1/586C02F2001/5218C02F1/66C02F1/5245C02F2101/16C02F2101/105C02F2209/06C02F2209/14C02F2209/18C02F2209/10C02F2201/002
Inventor 聂小保何一帆蒋昌波隆院男金筱英胡明睿周梨
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY