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Treatment method of calcium-containing organophosphorus scale inhibitor wastewater

A treatment method and organophosphorus technology, applied in water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. The effect of solving incomplete treatment, reducing secondary pollution and improving degradation efficiency

Active Publication Date: 2019-12-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A typical two-step method is the Fenton oxidation-precipitation method, specifically using Fe 2+ Catalytic H 2 o 2 The generated hydroxyl radicals (·OH) with high redox potential convert organic phosphorus compounds into inorganic phosphorus, and add chemical agents to achieve total phosphorus removal, but the operation process is complicated, the scope of application is narrow, the consumption of agents is large, and it is easy to produce Secondary pollution problems such as excess sludge
Compared with the two-step method, the one-step method can remove organic phosphate in one system, and has the advantage of simple and easy operation. However, some challenges in the practical application of the single-step method still hinder their development. The difficulty The main purpose is to realize the oxidative decomposition and removal of organic phosphorus in the same system, and avoid secondary pollution

Method used

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Embodiment 1

[0029] A method for treating calcium-containing organophosphorus scale inhibitor wastewater, comprising the following steps:

[0030] 1) Pretreatment with commercially available general-purpose macroporous resin D201: Rinse the purchased macroporous resin D201 with clean water until it is clear and free of turbidity and impurities. Then alternately soak in NaOH and HCI with a mass fraction of 4% for 2 hours, rinse with a large amount of water between alkali and acid until it is close to neutral, repeat twice, each time the acid-base dosage and resin volume ratio are 2:1, and then 55 Dry at a temperature of ℃, pass through a 60-mesh sieve, and set aside;

[0031] 2) Prepare 200mL of FeCl 4 - Precursor solution, the molar concentration of ferric chloride hexahydrate in the solution is 0.3mol / L, the molar concentration of sodium chloride is 0.2mol / L, and the molar concentration of hydrochloric acid is 0.2mol / L; 1.2gD201 is added to the above-mentioned FeCl 4 - In the precurso...

Embodiment 2

[0035] A method for treating calcium-containing organic phosphorus scale inhibitor wastewater, comprising the following steps:

[0036] 1) Pretreatment with commercially available general-purpose macroporous resin D201: Rinse the purchased macroporous resin D201 with clean water until it is clear and free of turbidity and impurities. Then soak in NaOH and HCI with a mass fraction of 5% for 4 hours alternately, rinse with a large amount of water between alkali and acid until it is close to neutral, repeat 3 times, each time the acid-base dosage and resin volume ratio are 3:1, and then 55 Dry at a temperature of ℃, pass through a 60-mesh sieve, and set aside;

[0037] 2) Prepare 200mL of FeCl 4 - Precursor solution, the molar concentration of ferric chloride hexahydrate in the solution is 1.5mol / L, the molar concentration of sodium chloride is 0.4mol / L, and the molar concentration of hydrochloric acid is 0.8mol / L; 1gD201 is added to the above-mentioned FeCl 4 - In the precur...

Embodiment 3

[0041] A method for treating calcium-containing organic phosphorus scale inhibitor wastewater, comprising the following steps:

[0042] 1) Pretreatment with commercially available general-purpose macroporous resin D201: Rinse the purchased macroporous resin D201 with clean water until it is clear and free of turbidity and impurities. Then soak in NaOH and HCI with a mass fraction of 5% for 2 hours alternately, rinse with a large amount of water between alkali and acid until it is close to neutral, repeat twice, each time the acid-base dosage and resin volume ratio are 2:1, and then 60 Dry at ℃, pass through a 60-mesh sieve, and set aside.

[0043] 2) Prepare 200mL of FeCl 4 - Precursor solution, the molar concentration of ferric chloride hexahydrate in the solution is 1.0mol / L, the molar concentration of sodium chloride is 0.4mol / L, and the molar concentration of hydrochloric acid is 0.4mol / L; 1.5gD201 is added to the above-mentioned FeCl 4 - In the precursor solution, aft...

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PUM

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Abstract

The invention relates to a treatment method of calcium-containing organophosphorus scale inhibitor wastewater. Ferric oxide hydrate (HFO) is loaded on strongly basic anion exchange resin (D201), and the loaded HFO-D201 composite nano catalyst is prepared. In a heterogeneous Fenton-like system, the prepared catalyst can catalyze the generation of hydroxyl radicals with strong oxidizability to degrade organophosphate in wastewater, adsorbs degradation products, and can remove total phosphorus through secondary synergistic enhancement according to the interaction of calcium ions and inorganic phosphorus. According to the constructed heterogeneous HFO-D201 catalyst, on one hand, the degradation efficiency of H2O2 on organophosphorus in a Fenton-like method can be improved, phosphorus is removed to a high degree, the reaction time is shortened, meanwhile, the energy consumption is reduced, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the field of organic phosphorus wastewater treatment technology, and in particular relates to a treatment method for calcium-containing organic phosphorus scale inhibitor wastewater. Background technique [0002] Dosing antiscalants in water bodies has become an important method to prevent scale and protect equipment pipelines, but at the same time it causes new environmental problems, increasing the content of organic phosphorus in the effluent, which exceeds the discharge standard. The important feature of organic phosphorus scale inhibitor wastewater is that it contains refractory and very stable organic phosphorus with large molecular weight, which is not easy to biodegrade. Hydroxyethylidene diphosphonic acid (HEDP) is an organophosphorus scale inhibitor widely used in the industry. Its carbon atoms are directly connected to phosphorus atoms, which is not easy to break bonds, and can react with various ions to form complex...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J31/08B01J31/22C02F101/30
CPCC02F1/722C02F1/725B01J31/08B01J31/1658B01J2531/842C02F2101/30
Inventor 徐炎华刘珍雪刘璧铭宋文斌
Owner NANJING UNIV OF TECH
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