Physicochemical coagulation-defluorination-precipitation integrated wastewater treatment method

A wastewater treatment and coagulation technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, water/sewage treatment, water treatment parameter control, etc. It can solve the problems of long treatment process, large area of ​​treatment equipment, and high system operating costs. , to achieve the effect of reducing floor area, reducing system operating costs, and reducing construction investment

Inactive Publication Date: 2020-02-11
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Industrial wastewater treatment involves indicators such as COD, fluoride, and SS. Usually, corresponding process treatment measures and unit devices

Method used

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  • Physicochemical coagulation-defluorination-precipitation integrated wastewater treatment method
  • Physicochemical coagulation-defluorination-precipitation integrated wastewater treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A kind of waste water treatment method integrated with physicochemical coagulation, fluorine removal and precipitation, the waste water is coking waste water, COD is 105 mg / L, fluoride is 58 mg / L, SS is 55 mg / L before treatment, see figure 1 , including the following steps:

[0024] Step 1. Coagulation reaction: add PAC aluminum salt coagulant and PAM flocculant to industrial wastewater and stir, the addition of PAC aluminum salt coagulant is 180 ppm, and the addition of PAM flocculant is 5 ppm;

[0025] Step 2. Physicochemical reaction: Add slaked lime defluorinating agent to the industrial wastewater stirred in step 1 and stir again. The molar ratio of calcium to fluorine in the slaked lime defluorinating agent is 1:1.2;

[0026] Step 3. Sedimentation and separation: The mixture stirred in step 2 is subjected to sedimentation and separation. The sedimentation separation adopts a sloping plate sedimentation tank, the residence time of sewage is 65 minutes, and the surf...

Embodiment 2

[0028] A kind of waste water treatment method integrated with physicochemical coagulation, fluorine removal and precipitation, the waste water is coking waste water, COD is 109 mg / L, fluoride is 55 mg / L, SS is 58 mg / L before treatment, see figure 1 , including the following steps:

[0029] Step 1. Coagulation reaction: add PAC aluminum salt coagulant and PAM flocculant to industrial waste water and stir, the addition amount of described PAC aluminum salt coagulant is 200 ppm, the addition amount of PAM flocculant is 6 ppm;

[0030] Step 2. Physicochemical reaction: Add slaked lime defluorinating agent to the industrial wastewater stirred in step 1 and stir again. The molar ratio of calcium to fluorine in the slaked lime defluorinating agent is 1:1.5;

[0031] Step 3. Sedimentation and separation: The mixture stirred in step 2 is subjected to sedimentation and separation. The sedimentation separation adopts a sloping plate sedimentation tank, the residence time of sewage is 65 ...

Embodiment 3

[0033] A kind of waste water treatment method integrated with physicochemical coagulation, fluorine removal and precipitation, the waste water is coking waste water, COD is 113 mg / L, fluoride is 59 mg / L, SS is 61 mg / L before treatment, see figure 1 , including the following steps:

[0034] Step 1. Coagulation reaction: add iron salt coagulant and PAM flocculant to industrial waste water and stir, the addition of described iron salt coagulant is 800 ppm, the addition of PAM flocculant is 5 ppm;

[0035] Step 2. Physicochemical reaction: add calcium chloride defluoride agent to the industrial wastewater stirred in step 1 and stir again, the molar ratio of calcium to fluorine in the calcium chloride defluoride agent is 1:1.2;

[0036] Step 3. Sedimentation and separation: The mixture stirred in step 2 is subjected to sedimentation and separation. The sedimentation and separation adopts an inclined plate sedimentation tank, and the residence time of sewage is 65 minutes. The clea...

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Abstract

The invention discloses a physicochemical coagulation-defluorination-precipitation integrated wastewater treatment method, belonging to the technical field of industrial wastewater treatment. The method comprises the following steps: adding a PAM flocculant and a PAC aluminum salt coagulant or iron salt coagulant into industrial wastewater, and carrying out stirring; then adding slaked lime or a calcium chloride fluorine removal agent into the stirred industrial wastewater, and carrying out stirring again; and carrying out precipitation separation on a stirred mixture, carrying out centralizedtreatment on settled bottom-layer solid waste, and discharging settled liquid supernatant as effluent. According to the method disclosed by the invention, coagulation and defluorination reactions inwastewater treatment are cooperated, and coagulation and physicochemical sludge are combined and separated, so integrated treatment of COD, fluoride and SS indexes is realized; and thus, wastewater pollutant removal efficiency is improved, the occupied area of a treatment device is reduced, the construction investment of the treatment device is reduced, and system operation cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a wastewater treatment method integrating physicochemical coagulation, fluoride removal and precipitation. Background technique [0002] Industrial wastewater refers to the wastewater, sewage and waste liquid produced in the process of industrial production, which contains industrial production materials, intermediate products and products lost with water, as well as pollutants produced in the production process. With the rapid development of industry, the types and quantities of wastewater have increased rapidly, and the pollution of water bodies has become increasingly widespread and serious, threatening human health and safety. Therefore, for the protection of the environment, the treatment of industrial wastewater is more important than the treatment of urban sewage. [0003] Industrial wastewater treatment involves indicators such as CO...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/52C02F1/5245C02F1/56C02F1/583C02F2101/14C02F2209/08C02F2209/10
Inventor 郝陇岷
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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