Technology for oxidizing organic wastewater by mixing pyrite and biocha

A technology of organic wastewater and oxidation treatment, applied in the direction of oxidized water/sewage treatment, special compound water treatment, water/sewage treatment, etc., can solve the problems of mine acid wastewater pollution, easy to be oxidized, unstable, etc., and achieve excellent treatment effect Good, promote oxidation removal, strengthen the effect of promoting effect

Inactive Publication Date: 2019-04-12
SHAOXING UNIVERSITY
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  • Application Information

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Problems solved by technology

Pyrite is unstable and easily oxidized in an aerobic environment, and improper disposal will cause mine acid wastewater pollution

Method used

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  • Technology for oxidizing organic wastewater by mixing pyrite and biocha
  • Technology for oxidizing organic wastewater by mixing pyrite and biocha
  • Technology for oxidizing organic wastewater by mixing pyrite and biocha

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0028] Embodiment 1-1: Treatment of simulated dye wastewater

[0029] Step 1: Biochar Heat Treatment

[0030] Weigh 500g of biochar, put it into 2L of ferrous sulfate (0.4mol / L) solution with a mass concentration of 11%, and immerse it for 60min, then centrifuge to separate the solid matter, and put it into a tube furnace for vacuum heat treatment at 400°C for 2h , cooled, and crushed through a 100-mesh sieve to obtain heat-treated biochar.

[0031] Step 2: Fenton Oxidation Process

[0032] Prepare 500mL of rhodamine B solution with a concentration of 200mg / L, and use it as simulated dye wastewater. Add 15g of heat-treated biochar and 7.5g of pyrite in the dye wastewater in turn (converted additions are 30 and 15g / L respectively), stir and mix evenly, then add 5mL of hydrogen peroxide with a concentration of 1mol / L Solution (converted hydrogen peroxide addition amount is 10mmol / L), stirring continuous reaction. Take liquid samples when reacting for 30, 60, 120, and 180 min...

Embodiment 1-2

[0033] Embodiment 1-2: Treatment of antibiotic wastewater

[0034] The initial COD value of antibiotic wastewater from a pharmaceutical factory producing cephalosporins was 600mg / L. Add 40g of heat-treated biochar and 20g of pyrite in 1L of the waste water in succession in Example 1-1, stir and mix evenly, then add 15mL of hydrogen peroxide solution with a concentration of 1mol / L, and stir for continuous reaction for 120 and 180min. The COD values ​​in the waste water were sampled and measured to be 33 and 17 mg / L respectively. That is, after 180 minutes of treatment, the COD value in the wastewater meets the requirements of the Class A wastewater discharge standard (<20mg / L).

Embodiment 2-1、2-2、2-3

[0039] Embodiment 2-1, 2-2, 2-3: Based on embodiment 1-1, when using ferrous salt to impregnate biochar in the first step, change the concentration of ferrous salt to 0.1, 0.3, 0.5mol / L respectively , and other subsequent processing conditions are the same. The degradation rate results of Rhodamine B in dye wastewater are shown in Figure 1B .

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Abstract

The invention discloses a technology for oxidizing organic wastewater by mixing pyrite and biochar. The technology is characterized by comprising the following steps that 1, the biochar is put into anacidic ferrous salt solution for dipping, and then vacuum heat treatment is carried out in a tubular furnace; 2, the biochar obtained after heat treatment and the pyrite are sequentially added into the organic wastewater, stirred and evenly mixed, then hydrogen peroxide is added, and fenton oxidation reaction is carried out; 3, after the chemical oxygen demand in the wastewater reaches the standard, solid is separated out, and the solid is repeatedly used after being recycled. The organic wastewater is treated by combining the modified biochar and the pyrite, and the treatment effect is excellent; the modified biochar and the pyrite can be recycled many times and have very good environmental protection performance and industrial application prospects.

Description

Technical field: [0001] The invention relates to a process for treating organic wastewater, in particular to a process for oxidizing organic wastewater by using pyrite and biochar as mixed active materials. Background technique: [0002] With the rapid development of industry and agriculture, a large amount of wastewater rich in dyes, pesticides, antibiotics and other organic pollutants is produced, collectively referred to as organic wastewater. If not handled properly, it will have a serious impact on environmental ecology and human health. Fenton oxidation technology is an important method to treat organic wastewater, using ferrous ions (Fe 2+ ) and hydrogen peroxide can generate hydroxyl radicals with strong oxidizing ability, which can non-selectively oxidize most organic pollutants in wastewater, and are especially suitable for organic wastewater treatment. In recent years, more and more attention has been paid to the multiphase Fenton oxidation technology using iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F103/28
CPCC02F1/722C02F2103/30C02F2305/026
Inventor 吕金红朱晓晓李建法
Owner SHAOXING UNIVERSITY
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