Method for degradation of high salinity organic wastewater and synchronous preparation of iron oxide

A technology for organic wastewater with high salt content, applied in the fields of iron oxide, chemical instruments and methods, iron oxide/iron hydroxide, etc., which can solve the problems of sludge generation and low utilization rate of oxidant

Inactive Publication Date: 2017-11-24
HEBEI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of low oxidant utilization rate and sludge generation in the existing high-salt industrial wastewater

Method used

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Experimental program
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Embodiment 1

[0030] This embodiment provides a method for degrading high-salt organic wastewater and synchronously preparing iron oxide. The high-salt organic wastewater is selected from the industrial wastewater produced in the acid oxidation stage of DSD production, which contains NaSO 4 The content is about 10wt%, and the total organic carbon (TOC) is 9438mg / L. Take 200 mL of waste water and place it in a stirred reactor, add 0.5 g of iron oxide red catalyst, the oxidant is H 2 o 2 , and then take 30wt% H 2 o 2 30mL and 3.7mol / L ferrous chloride 75mL were simultaneously added to the reactor with a peristaltic pump, the pH of the reaction solution was controlled at 5.0-5.5 with lye, and the degradation reaction was carried out. After degradation, the TOC was 669mg / L, and the degradation efficiency 92.9%. The COD of the water sample was 76 mg / L after the salt was evaporated. The coloring power of the iron oxide red product produced by the reflux transformation of the filter cake iro...

Embodiment 2

[0032] This embodiment provides a method for degrading high-salt organic wastewater and synchronously preparing iron oxide. The high-salt organic wastewater is selected from the industrial wastewater produced in the acid oxidation stage of DSD production, which contains NaSO 4 The content is about 10wt%, and the total organic carbon (TOC) is 9438mg / L. Take 200 mL of waste water and place it in a stirred reactor, add 0.5 g of iron oxide red catalyst, and the oxidant is Na 2 S 2 o 8 , and then respectively take 130g Na 2 S 2 o 8 150 mL of aqueous solution and 3.7mol / L ferrous chloride, and the peristaltic pump was added to the reactor synchronously. The pH value of the reaction solution was controlled at 5.0-5.5 with alkali, and the degradation reaction was carried out. After degradation, the TOC was 366mg / L, and the degradation efficiency It was 91.3%. After distilling off the salt, the COD of the water sample is 49mg / L. Iron oxide red produced by reflux conversion of fi...

Embodiment 3

[0034] This embodiment provides a method for degrading high-salt organic wastewater and synchronously preparing iron oxide. The high-salt organic wastewater is selected from the industrial wastewater produced in the acid oxidation stage of DSD production, which contains NaSO 4 The content is about 10wt%, and the total organic carbon (TOC) is 9438mg / L. Take 200 mL of waste water and place it in a stirred reactor, add 0.5 g of iron oxide red catalyst, and the oxidizing agent is O 2, take 105mL of 3.7mol / L ferrous chloride, and add it into the reactor with a peristaltic pump. The pH value of the reaction solution is controlled at 5.0-5.5 with alkali, and the degradation reaction is carried out. After degradation, the TOC is 519mg / L, and the degradation efficiency is 96 %. After distilling off the salt, the COD of the water sample is 64mg / L. Iron oxide red produced by reflux conversion of the filter cake iron oxide has a coloring power of 99% (511 nm), and the product has good p...

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Abstract

Relating to the technical field of wastewater treatment, the invention in particular discloses a method for degradation of high salinity organic wastewater and synchronous preparation of iron oxide. The method at least includes the steps of: firstly adjusting the pH value of the high salinity organic wastewater to 4.0-6.5, adding an iron oxide catalyst in advance, then adding an oxidizing agent and Fe<2+> for reaction, and controlling the pH value at 4.0-6.5 in the reaction process; and conducting filtration at the end of reaction, adding water into a filter cake for dispersion, then adding Fe<2+>, and carrying out heating reaction to generate iron oxide red or iron oxide yellow. According to the invention, the catalyst iron oxide is added in advance to induce reaction, then Fe<2+> and the oxidizing agent are added simultaneously for in-situ generation of a lot of nano-iron oxide catalyst, the .OH generation efficiency and organic matter degradation speed are improved, the TOC removal rate is 80% or above, the degradation effect is excellent, and at the end of degradation, a pigment grade iron oxide product can be obtained, thus achieving waste utilization.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for degrading high-salt organic wastewater and synchronously preparing iron oxide. Background technique [0002] With the rapid development of my country's pharmaceutical, chemical, petroleum, seafood and other industries, the discharge of high-salt and refractory organic wastewater is increasing. The current conventional treatment method is desalination and regeneration first. Evaporation is the simplest and most effective method for the desalination of wastewater containing high concentrations of organic matter, but conventional evaporation methods can only achieve desalination and cannot degrade organic pollutants, resulting in secondary pollution and other problems. Due to the advantages of mild reaction conditions, simple equipment operation, relatively low treatment cost and wide application range, Fenton and Fenton-like oxidation technology has been s...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/10C01G49/06C02F101/30
CPCC01G49/06C02F1/001C02F1/048C02F1/66C02F1/722C02F1/725C02F9/00C02F2101/30C02F2209/06C02F2305/023
Inventor 魏雨刘辉周金明
Owner HEBEI NORMAL UNIV
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