Treatment method for high-concentration phosphorus-containing wastewater

A treatment method and high-concentration technology, applied in the direction of neutralized water/sewage treatment, oxidized water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problem of difficult to meet discharge standards, difficult to completely remove organic phosphorus and inorganic phosphorus, etc. problems, to achieve the effect of improving the reactivity, rapid and thorough phosphorus removal, and a wide range of phosphorus removal

Inactive Publication Date: 2019-12-03
石家庄新奥环保科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Aiming at the problem that it is difficult to completely remove the organic phosphorus and inorganic phosphorus in the existing high-concentration phosphorus-containing pesticide wastewater treatment method, and it is difficult to meet the discharge standard, the present invention provides a treatment method for high-concentration phosphorus-containing wastewater

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] A treatment method for high-concentration phosphorus-containing wastewater:

[0034] Step a, take 10t of phosphorus-containing pesticide wastewater, measure wherein the inorganic phosphorus content is 1245mg / L and the organic phosphorus content is 2398mg / L, add a mass fraction of 10% calcium hydroxide solution to the pesticide wastewater, and adjust the pH to 7.5 , adding 0.45t of the above-mentioned calcium hydroxide solution with a mass fraction of 10%, carrying out the precipitation reaction for 0.5h, and filtering to obtain the primary treatment solution;

[0035] In step b, the primary treatment liquid is conditioned so that its calorific value reaches 3.9-4.5MJ / Kg, and then the conditioned waste liquid is added to a supercritical oxidation reaction device at a temperature of 600°C and a pressure of 23MPa Under the conditions of supercritical oxidation reaction, the reaction time is 3.5h, the temperature is lowered to 55°C, and the water is discharged to obtain 50t...

Embodiment 2

[0038] A treatment method for high-concentration phosphorus-containing wastewater:

[0039] Step a, take 10t of phosphorus-containing pesticide wastewater, measure the content of inorganic phosphorus to 6545mg / L and organic phosphorus to 8625mg / L, add calcium hydroxide solution with a mass fraction of 8% to the pesticide wastewater, and adjust the pH to 7.2 3.52 tons of the above-mentioned calcium hydroxide solution with a mass fraction of 8% were added, the precipitation reaction was carried out for 1.5 hours, and filtration was performed to obtain the primary treatment solution;

[0040] In step b, the primary treatment liquid is conditioned so that its calorific value reaches 3.9-4.5 MJ / Kg, and then the conditioned waste liquid is added to a supercritical oxidation reaction device at a temperature of 500°C and a pressure of 22.4 Under the condition of MPa, the supercritical oxidation reaction is carried out, the reaction time is 3.5h, the temperature is lowered to 50°C, and...

Embodiment 3

[0043] A treatment method for high-concentration phosphorus-containing wastewater:

[0044] Step a, get 10 tons of phosphorus-containing pesticide waste water, measure wherein inorganic phosphorus content is 5630mg / L and organic phosphorus content is 6851mg / L, in described pesticide waste water, add the calcium hydroxide solution that massfraction is 12%, adjust pH as 8.0, add 2.2t of the above-mentioned calcium hydroxide solution with a mass fraction of 12%, carry out the precipitation reaction for 1.0h, and filter to obtain the primary treatment solution;

[0045] In step b, the primary treatment liquid is conditioned so that its calorific value reaches 3.9-4.5MJ / Kg, and then the conditioned waste liquid is added to a supercritical oxidation reaction device at a temperature of 650°C and a pressure of 24MPa Under the conditions of supercritical oxidation reaction, the reaction time is 3.5h, the temperature is lowered to 50-60°C, and the water is discharged to obtain 50t of se...

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Abstract

The invention discloses a treatment method for high-concentration phosphorus-containing wastewater. The treatment method comprises the steps: adding alkali liquor into the high-concentration phosphorus-containing wastewater, adjusting pH to 7.2 to 8 to enable ortho-phosphate to present in forms of monohydrogen phosphate and dihydrogen phosphate, then, adding a precipitant to enable phosphate and the precipitant to form an insoluble compound, and carrying out filtering; adding filter liquor into a supercritical water oxidation reaction device, thoroughly blending organics, oxygen gas and waterduring reaction under a supercritical state so as to form a uniform phase, rapidly oxidating organic phosphorus into inorganic phosphate, and releasing the inorganic phosphate into a liquid phase; andadding ferric polysulfate and an anionic polyacrylamide solution into supercritical treated wastewater, and carrying out condensation and flocculation processes, so as to settle and remove phosphate.According to the method, phosphorus is removed by employing a supercritical oxidation and chemical precipitation cooperated method, phosphorus removal is rapid and thorough and is relatively wide inrange, high-concentration organic phosphorus and inorganic phosphorus can be treated, and the content of total phosphorus in final wastewater is lower than 1mg/L.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for high-concentration phosphorus-containing wastewater. Background technique [0002] Pesticide industry is one of the main industries of my country's chemical industry. 80% of my country's pesticide products are organophosphorus pesticides. The main products are trichlorfon, dichlorvos, dimethoate, methamidophos, glyphosate, etc. Organophosphorus pesticide wastewater has complex components, high pollutant concentration, strong toxicity, and serious environmental pollution. It is one of the more difficult-to-degrade wastewater. The concentration of total phosphorus in organic phosphorus pesticide waste liquid is relatively high, and the phosphorus element exists in complex forms, which can be divided into organic phosphorus and inorganic phosphorus. In inorganic phosphorus, phosphorus mainly exists in the form of orthophosphorus salt and hypophosphoro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/30
CPCC02F1/001C02F1/52C02F1/56C02F1/66C02F1/72C02F9/00C02F2101/105C02F2101/30
Inventor 郄雪光郜子兴邢继辉杜亚威徐爱卿董涛
Owner 石家庄新奥环保科技有限公司
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