Method for reducing content of phosphorus and COD in wastewater

A phosphorus content and wastewater technology, which is applied in metallurgical wastewater treatment, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of large capital investment of enterprises and complex treatment of phosphorus-containing wastewater, so as to increase additional value income, reduce capital investment, The effect of avoiding environmental pollution

Inactive Publication Date: 2019-10-22
湛江市红日稀土有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing phosphorus content and COD content in wastewater in order to solve the problem of complex treatment of a large amount of phosphorus-containing wastewater in the existing rare earth chloride production process and large capital investment of enterprises

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  • Method for reducing content of phosphorus and COD in wastewater
  • Method for reducing content of phosphorus and COD in wastewater

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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] see Figure 1~2 , a method for reducing phosphorus content and COD content in wastewater, comprising the steps of:

[0032] Step 1: Filtrate the phosphorus-containing wastewater twice to obtain dephosphorylated water, then add sodium carbonate solution for reaction, and after the reaction is completed, let it stand for calcium precipitation to obtain calcium carbonate and calcium-removed purified water;

[0033] Step 2: use hydrochloric acid to mix calcium carbonate to dissolve, then filter to obtain calcium chloride solution;

[0034] Step 3: the calcium chloride solution is mixed with ph...

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Abstract

The invention discloses a method for reducing the content of phosphorus and COD in wastewater. The method includes the steps of: 1. conducting two filtering treatment on phosphorus-containing wastewater to obtain dephosphorized water, then adding a sodium carbonate solution for reaction, and conducting standing and calcium precipitation to obtain calcium carbonate and calcium removed purified water; 2. mixing hydrochloric acid with calcium carbonate for dissolution to obtain a calcium chloride solution; and 3. mixing the calcium chloride solution with phosphorus-containing wastewater, carryingout reaction and filtering to obtain calcium orthophosphate and dephosphorized water, and subjecting the dephosphorized water to treatment as step 1 again. According to the invention, comprehensive treatment is carried out on the phosphorus-containing wastewater generated in the process of producing mixed rare earth chloride from monazite concentrate, calcium phosphate is extracted from the phosphorus-containing wastewater, the additional value income of the product is increased, at the same time, the treated purified water is further used in the recovery link of rare earth prior dissolved slag, thus realizing the comprehensive utilization of water resources and maximizing the utilization of water resources.

Description

technical field [0001] The invention belongs to the technical field of phosphorus-containing wastewater treatment, and specifically relates to a method for reducing phosphorus content and COD content in wastewater. Background technique [0002] Monazite is a relatively common accessory mineral in intermediate-acid igneous rocks and metamorphic rocks, and also exists in some sedimentary rocks. It is a phosphate mineral containing cerium and lanthanum, a rare earth mineral, and rare earth elements are used in black and nonferrous metallurgy, glass and ceramic production, electronics, electric lighting, television and laser technology, chemical industry, medical treatment and agricultural production widely used in the field. The rare earth chloride produced from monazite concentrate can be used as raw material for electrolysis of mixed rare earth metals, rare earth alloys and extraction of single rare earth elements, and can also be used as raw material for petrochemical catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/32C22B7/00C22B59/00C07C51/41C07C55/07C02F101/10C02F103/16
CPCC01B25/32C02F1/001C02F1/5236C02F1/66C02F9/00C02F2101/105C02F2103/16C07C51/412C22B7/007C22B59/00C07C55/07Y02P10/20
Inventor 陈双华郑义郑景丰张林逸周晖东黄秀刘冬志梁小越吴海霞
Owner 湛江市红日稀土有限公司
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