Optimization of wastewater fluorine-removal method and process through sludge refluxing effect

A technology for sludge return and waste water, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc. problems, to achieve the effect of reducing the dosage, improving the utilization rate of lime, and saving costs

Inactive Publication Date: 2016-04-06
北京翰祺环境技术有限公司
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

Among them, the method of adding lime in the chemical precipitation method is a low-cost and widely used method for removing fluoride, but this method has some shortcomings, such as the low utilization rate of lime du

Method used

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  • Optimization of wastewater fluorine-removal method and process through sludge refluxing effect
  • Optimization of wastewater fluorine-removal method and process through sludge refluxing effect
  • Optimization of wastewater fluorine-removal method and process through sludge refluxing effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The quality of wastewater before defluoridation treatment is as follows (mg / L):

[0026]

[0027] Take 500mL of fluorine-containing waste water from the coal chemical industry and first enter the lime dosing area A through the water inlet pipe 1 of the small test device, and add 4mL of 10% lime solution to the lime dosing area A, stir with a mechanical stirrer for 15 minutes, and measure Its pH value is about 11; after the wastewater enters the acid addition area B, add sulfuric acid solution to adjust the pH to 8-9, and the dosage of sulfuric acid is 1.5mL; after the wastewater enters the coagulation area C, the dosage concentration is 10 % polyaluminum chloride coagulant 1.5mL, fully stirred for 2min, after the waste water enters the flocculation area D through the bottom pipe 11, add 0.5mL of the flocculant polyacrylamide solution with a concentration of 10%, and after stirring slowly for 15min, the sewage passes through The push flow wall 18 enters the simulated ...

Embodiment 2

[0033] Divide into 4 groups of experiments. Ensure that other conditions remain unchanged in Example 1, the sludge return rate is 6%, and the amount of lime added in the lime dosing area A is 2mL, 4mL, 6mL, 8mL respectively, that is, the dosing concentration is 400mg / L respectively , 800mg / L, 1200mg / L, 1600mg / L. After processing finished, take out the water that water pipe 16 discharges and measure its fluorine content. After defluoridation treatment, the fluoride ion concentration in the treated water is shown in the table below:

[0034]

[0035] It can be seen from the treatment results that when the lime concentration is 400mg / L to 1600mg / L, the fluoride ion content in the treated wastewater is below 15mg / L, and when the lime concentration is 800mg / L, the fluoride ion content in the treated wastewater lowest concentration. After that, with the increase of lime concentration, the removal efficiency of fluorine changed little.

[0036] In addition, it has been verifie...

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Abstract

The invention discloses optimization of a wastewater fluorine-removal method and process through a sludge refluxing effect; fluorine-containing substances in water can be effectively removed; through combination of a lime fluorine-removal method and an efficient sedimentation tank process, process parameters are optimized; sludge in a sedimentation zone of an efficient sedimentation tank is refluxed to a flocculation zone according to a certain proportion, so that the concentration of the sludge in the flocculation zone is increased; a carrier is provided for calcium fluoride, fluorine removal is strengthened, the disadvantages of large lime addition amount and low treatment efficiency in a conventional general treatment process are improved, and lime is efficiently used. The method and process have the characteristics of good water quality of effluent, less drug consumption, high sludge solid containing rate, and small occupied land area.

Description

technical field [0001] The invention relates to a method and process for optimizing waste water defluorination through sludge reflux, and aims to improve the existing defluorination process and improve the current disadvantages of lime defluorination. Background technique [0002] Fluorine-containing wastewater has a very bad impact on human health and the ecological environment. Therefore, in recent years, there have been a lot of researches on the defluorination process at home and abroad. At present, the main defluoridation technologies formed at home and abroad mainly include adsorption method, electrodialysis method, reverse osmosis method, ion exchange method, chemical precipitation method and so on. Among them, the method of adding lime in the chemical precipitation method is a low-cost and widely used method for removing fluoride, but this method has some shortcomings, such as the low utilization rate of lime due to the characteristics of lime itself, and the dosage...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/52C02F1/5236C02F1/583C02F1/66C02F2101/14C02F2301/08
Inventor 王晓阳闫清云刘静姚红坡曹宁
Owner 北京翰祺环境技术有限公司
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