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Resource utilization method for synchronously treating Fenton iron sludge and obtaining FePO4

A synchronous processing and recycling technology, applied in the field of Fenton iron sludge recycling, can solve the problems of complex composition and hazardous waste of Fenton iron sludge.

Pending Publication Date: 2020-07-07
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problem that the existing Fenton oxidation technology produces a large amount of Fenton iron slime hazardous waste, the present invention aims to provide a method for synchronously processing Fenton iron slime and obtaining FePO 4 The method of resource utilization, this method avoids the addition of alkali to adjust after Fenton oxidation to produce a large amount of Fe(OH) 3 Fenton iron slime hazardous waste with complex composition as the main component can be directly produced on-line FePO 4 The main phosphorus-iron compound can be used as the raw material of lithium iron phosphate for lithium battery after purification to realize resource utilization of Fenton iron slime and FePO 4 The acquisition of the product is very suitable for the transformation of the Fenton process, and has great economic and environmental benefits

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  • Resource utilization method for synchronously treating Fenton iron sludge and obtaining FePO4

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Embodiment 1

[0022] Taking a sewage treatment plant in an industrial park as an example, the sewage treatment plant in the industrial park adopts the Fenton process as an advanced treatment process, and uses the industrial sewage treatment plant to prepare FePO online 4 . The feed water flow rate of the Fenton reaction tower is 50m 3 / h, influent COD100mg / L, total phosphorus 2mg / L, the addition of hydrogen peroxide is 5kg / h, FeSO 4 The addition amount is 10kg / h. By adding dilute sulfuric acid online, the pH of the water entering the Fenton oxidation tower is 3.5. After the Fenton oxidation reaction, the COD of the Fenton reaction tower effluent is 60mg / L, Fe 3+ 75mg / L, total phosphorus 1mg / L, and then the effluent from the Fenton oxidation tower directly enters the primary sedimentation tank without adjusting the pH to remove suspended solids, organic matter and colloids in the Fenton effluent. The COD of the primary sedimentation tank effluent is 50mg / L, Fe 3+ 70mg / L, then enter the rea...

Embodiment 2

[0024] Taking a sewage treatment plant in an industrial park as an example, the sewage treatment plant in the industrial park adopts the Fenton process as an advanced treatment process, and uses the industrial sewage treatment plant to prepare FePO online 4 . The feed water flow rate of Fenton reaction tower is 100m 3 / h, influent COD200mg / L, total phosphorus 2mg / L, hydrogen peroxide addition 30kg / h, FeSO 4 The addition amount is 50kg / h. By adding dilute sulfuric acid online, the pH of the Fenton oxidation tower inlet water is 3.5. After the Fenton oxidation reaction, the Fenton reaction tower effluent COD is 80mg / L, Fe 3+ 150mg / L, total phosphorus 1mg / L, and then the effluent from the Fenton oxidation tower directly enters the primary sedimentation tank without adjusting the pH to remove suspended solids, organic matter and colloids in the Fenton effluent. The COD of the primary sedimentation tank effluent is 60mg / L, Fe 3+ is 350mg / L, then enters the reaction tank, and Na i...

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Abstract

The invention discloses a resource utilization method for synchronously treating Fenton iron sludge and obtaining FePO4. After Fenton oxidation, the effluent directly enters a first-stage sedimentation tank without adjusting the pH value; effluent of the first-stage sedimentation tank enters a reaction tank, an alkaline phosphate mixture is added into the reaction tank to react with Fe<3+>, effluent of the reaction tank enters a second-stage sedimentation tank to obtain a FePO4 crude product, effluent of the second-stage sedimentation tank passes through a nanofiltration system, effluent of the nanofiltration system is discharged after reaching the standard or recycled as miscellaneous water, and nanofiltration concentrated liquor flows back to the reaction tank. According to the method, alarge amount of Fenton iron sludge hazardous wastes generated by alkali addition regulation after Fenton oxidation are avoided, a FePO4 crude product can be directly prepared on line, the FePO4 crudeproduct can be used as a raw material of lithium iron phosphate of a lithium battery after being purified, resource utilization of Fenton iron sludge and obtaining of the FePO4 product are achieved,and the method is very suitable for transformation of a Fenton process and has great economic benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of Fenton iron slime, and relates to a method for synchronously processing Fenton iron slime and obtaining FePO 4 resource utilization methods. Background technique [0002] Fenton oxidation technology is an efficient advanced oxidation technology, its principle is H 2 o 2 in Fe 2+ OH is produced under the catalysis of OH, which is a very strong oxidizing free radical, which can oxidize macromolecular refractory organic matter into small molecules, improve the biodegradability of wastewater, and is widely used in wastewater treatment of chemical industry, printing and dyeing, etc. . However, after the traditional Fenton oxidation process, by adding alkali to adjust the Fenton effluent to remove Fe 3+ , a large amount of iron sludge will be produced during the reaction. The composition of iron slime is mainly Fe(OH) 3 Mainly, with complex components and leaching toxicity, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/37C02F1/44C02F1/64C02F1/72C02F101/10C02F101/30
CPCC02F9/00
Inventor 庄晓杰邓红波李云郑冲祥
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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