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Method for recycling wastewater containing sodium hypochlorite

A technology of sodium hypochlorite and sodium hypochlorite solution, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problems of limited amount of oxidant and oxidation time, high total phosphorus concentration in wastewater, affecting the quality of effluent, etc. Convenient, low-cost, easy-to-control effects

Inactive Publication Date: 2018-04-06
内蒙古君正化工有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the production process of acetylene produced by the calcium carbide method, due to the presence of a large amount of phosphorus, sulfur and other elements in the calcium carbide, the acetylene gas produced contains a relatively high concentration of PH 3 、H 2 S is absorbed and oxidized by sodium hypochlorite during the cleaning process, but due to the limited amount of oxidant and the limited oxidation time, elements such as sulfur and phosphorus cannot be completely oxidized to sulfate or phosphate, resulting in a large amount of reducing substances in the wastewater. COD, especially phosphorus, will produce a large amount of unreacted non-orthophosphorus phosphate radicals in wastewater. According to the chemical properties of phosphate radicals, in addition to metal salts of orthophosphate radicals, other valence phosphorus salts All soluble in water, resulting in extremely high concentration of total phosphorus in wastewater, which is difficult to remove in subsequent treatment processes, affecting the quality of effluent water

Method used

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  • Method for recycling wastewater containing sodium hypochlorite
  • Method for recycling wastewater containing sodium hypochlorite
  • Method for recycling wastewater containing sodium hypochlorite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment is a simulation experiment of a method for recovering waste water containing sodium hypochlorite.

[0046] This test is divided into three groups, first add 500mL sodium hypochlorite wastewater into the beaker, then add 4mL, 5mL, 6mL sodium hypochlorite solution with a mass concentration of 10%, stir fully and react, and take samples after 4 hours and 8 hours.

[0047] Add 0.1 mL of PAC with a mass concentration of 0.1% to the sampled wastewater, and then add 0.1 mL of PAM with a mass concentration of 0.1% to remove orthophosphate.

[0048] Table 2 Test data

[0049]

[0050]

[0051] After adding 4mL sodium hypochlorite, 5mL sodium hypochlorite, and 6mL sodium hypochlorite respectively, the residual chlorine in the water is calculated to be 1000mg / L, 1250mg / L, and 1500mg / L respectively.

[0052] It can be seen from Table 2 that when 5ml of sodium hypochlorite is added, the content of total phosphorus has a small difference between sampling at 4 hou...

Embodiment 2

[0054] This embodiment uses the same simulation experiment as in Embodiment 1 to provide a method for recovering waste water containing sodium hypochlorite.

[0055] This test is divided into three groups, first add 500mL sodium hypochlorite wastewater into the beaker, add 5mL sodium hypochlorite solution with a mass concentration of 10%, stir and take a sample every 4 hours and 8 hours. The water samples were subjected to coagulation and sedimentation treatment, and PAM and ferric chloride with mass ratios of 1:1, 2:1, 2.15:1, and 3:1 were added to the oxidized water samples for treatment, and the removal of phosphorus was investigated. Effect.

[0056] Table 3 Test data

[0057]

[0058] It can be seen from the above table that after using the combination of PAM and ferric chloride, the removal effect of total phosphorus is better than that of PAC and PAM.

[0059] Phosphorus content in sodium hypochlorite wastewater fluctuates greatly. When the total phosphorus content...

Embodiment 3

[0063] A system for recovering waste water containing sodium hypochlorite, comprising a stripping tower connected in series, a water storage tank, a cooling tower, an integrated reaction tank, a sedimentation tank, and a reuse tank; the sludge outlet of the sedimentation tank is connected with a sludge tank; The outlet of the reuse pool is connected in parallel with the preparation unit of sodium hypochlorite and the salt recovery unit; and the addition of catalyst, sodium hypochlorite solution and flocculant is controlled by the DCS control system; figure 1 The flowchart shown.

[0064] Wherein, the stripping tower is provided with a blower and a catalyst addition inlet; the integrated reaction tank is provided with a sodium hypochlorite solution addition inlet; and the sedimentation tank is provided with a flocculant addition inlet.

[0065] The method for processing phosphorus in the waste water may further comprise the steps:

[0066] 1) the waste water flows into the str...

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Abstract

The invention relates to a method for recycling wastewater containing sodium hypochlorite. The method comprises the following steps: 1) performing air-blowing vaporization on wastewater, carrying outa preliminary oxidation reaction on gaseous wastewater in the presence of a catalyst, and cooling; 2) dropping the cooled wastewater into a sodium hypochlorite solution to carry out an oxidizing reaction; and 3) adding a flocculating agent into the oxidized wastewater for settling, and recycling the clear liquor. The invention further discloses a system realizing the method. The system comprises astripping tower, a cooling tower, an integrated reaction tank, a sedimentation basin and a recycling pool connected in series, wherein the stripping tower is provided with an air blower and a catalyst adding inlet; an adding inlet of the sodium hypochlorite solution is formed in the integrated reaction tank; and an adding port of a flocculating agent is formed in the sedimentation basin. The method disclosed by the invention is simple in process flow, low in water treatment and wastewater recycling cost and capable of realizing recycling of water resources.

Description

technical field [0001] The invention relates to a waste sodium hypochlorite waste water treatment and reuse technology, in particular to a method for reusing waste water generated in a cleaning system in the cleaning process of producing sodium hypochlorite by calcium carbide method acetylene. Background technique [0002] In the production process of using sodium hypochlorite to clean acetylene, the reuse of sodium hypochlorite wastewater has always been a difficult problem in the industry. Even after sodium hypochlorite compounding and reuse, there are still 20m 3 / h Sodium hypochlorite wastewater is discharged outside, and zero discharge of sewage cannot be truly realized. Moreover, the wastewater contains a large amount of phosphorus, sulfur and other elements, the presence of phosphorus, sulfur and other elements will lead to a higher concentration of PH in the generated acetylene gas 3 、H 2 S, so sodium hypochlorite wastewater cannot be reused directly. It is necess...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/12C02F101/10
CPCC02F1/52C02F1/56C02F1/66C02F1/725C02F1/74C02F1/76C02F9/00C02F2001/007C02F2101/105C02F2101/12C02F2209/18C02F2301/08
Inventor 段燕飞张敬宇王洪丽朱成志刘鹏鸣王洪亮李占元张红瑞
Owner 内蒙古君正化工有限责任公司
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