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Treatment method for phosphorus trichloride production wastewater

A technology for phosphorus trichloride and waste water production, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of increasing the operating load of the biochemical treatment process, major safety risks and environmental risks, etc. To achieve the effect of convenient source of raw materials and simple process flow

Inactive Publication Date: 2020-06-02
安道麦股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing treatment process: all kinds of wastewater are collected into the collection tank, and after settling, the supernatant is sent to the sewage treatment plant for centralized treatment. This will increase the operating load of the biochemical treatment process. In addition, the settled phosphorus sludge needs to be cleaned regularly. Because the slag contains elemental phosphorus, it is easy to burn when exposed to air, and there are great safety and environmental risks in the slag cleaning process.

Method used

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  • Treatment method for phosphorus trichloride production wastewater

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Embodiment 1

[0021] This embodiment discloses a treatment method for phosphorus trichloride production wastewater, combining figure 1 It can be seen that it includes getting 350g phosphorus-containing sewage and placing it in the oxidation sedimentation tank, wherein, the COD48mg / L and total phosphorus of this phosphorus-containing sewage are 2370mg / L; under normal temperature stirring state, add 15g calcium hypochlorite, after the reaction time 60min, Continue to add the phosphorus removal agent ferric chloride until no more precipitation occurs, filter, and the filter residue is used as a phosphate fertilizer, and the filtrate continues to be post-treated, specifically including adjusting the pH of the solution to about 7 with dilute sulfuric acid, and then adding polyaluminum chloride for further processing. The total phosphorus in the supernatant liquid obtained by adsorption and filtration of the water was measured by relevant chemical analysis methods, and the total phosphorus reached...

Embodiment 2

[0023] This embodiment discloses a method for treating wastewater from phosphorus trichloride production, which includes taking 250g of phosphorus-containing sewage and placing it in an oxidation sedimentation tank, wherein, the COD of the phosphorus-containing sewage is 45mg / L, and the total phosphorus is 2100mg / L; 18g of sodium hypochlorite is added under the condition of 60 minutes after the reaction time, continue to add the dephosphorization agent aluminum chloride until no more precipitation occurs, filter, the filter residue is precipitated and used as phosphate fertilizer, and the filtrate continues to be post-treated, specifically including the use of dilute sulfuric acid to adjust the pH of the solution To about 7, then add polyaluminum chloride and then further absorb and filter the clear liquid to measure its total phosphorus by relevant chemical analysis methods, reaching about 0.08mg / L. Analyzing the COD40mg / L in the supernatant, the total phosphorus removal rate ...

Embodiment 3

[0025] This embodiment discloses a method for treating waste water from phosphorus trichloride production, which includes taking 300g of phosphorus-containing sewage and placing it in an oxidation sedimentation tank, wherein, the COD of the phosphorus-containing sewage is 46 mg / L, and the total phosphorus is 2284 mg / L; stirring at room temperature Under the state, add 10g of chlorine gas, after 60 minutes of reaction time, continue to add phosphorus removal agent quicklime until no precipitation occurs, filter, the filter residue precipitates to be used as phosphate fertilizer, and the filtrate continues to be post-treated, specifically including using dilute sulfuric acid to adjust the pH of the solution to 7 After adding polyaluminum chloride, the clear liquid obtained by further adsorption and filtration was measured by relevant chemical analysis methods, and the total phosphorus reached about 0.06mg / L. The COD in the clear liquid was analyzed at 42mg / L, and the removal rate...

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Abstract

The invention discloses a treatment method for phosphorus trichloride production wastewater, and belongs to the technical field of chemical production. The method comprises the following steps: oxidizing phosphorus-containing sewage from a sewage tank into phosphate radicals in an oxidation settling tank by using an oxidant, making the phosphate radicals and a phosphorus removal agent react to generate precipitates, and carrying out aftertreatment on the filtered filtrate so as to be reused in phosphorus trichloride production, wherein the precipitates are used as phosphate fertilizer, and thephosphorus removal agent comprises one of ferric salt or aluminum salt.

Description

technical field [0001] The invention relates to a wastewater recovery and treatment process, which belongs to the technical field of chemical industry, in particular to a treatment method for phosphorus trichloride production wastewater. Background technique [0002] Phosphorus trichloride is a raw material for the production of various organophosphorus pesticides. It can be used to manufacture pesticides trichlorfon, dichlorvos, phosphorus sulfochloride, phosphorus oxychloride, phosphorous acid, phosphite and other phosphides. It can also be used as chlorine oxidizing agent, semiconductor dopant source, etc. In the production process, there are three main sources of its wastewater: phosphorus melting wastewater, pot washing wastewater, and tail gas absorption wastewater. The COD index of the wastewater is not high (less than 50mg / l), but the total phosphorus is as high as 2000-2400mg / l. Existing treatment process: all kinds of wastewater are collected into the collection t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C01B25/10
CPCC01B25/10C02F1/281C02F1/5245C02F1/66C02F1/722C02F1/76C02F1/78C02F9/00C02F2101/105
Inventor 薛光才周用义付立平张江红孙梅陈娟廖艳
Owner 安道麦股份有限公司
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