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Chemical and biological method for synchronous resource treatment of three kinds of rare earth metallurgical wastewater

A resource-based, biological technology, applied in the direction of metallurgical wastewater treatment, chemical instruments and methods, and microbial-based methods, can solve the problems that ammonia nitrogen is difficult to meet the discharge standards and has no actual large-scale application, so as to reduce the cost of wastewater treatment, Effect of low cost of denitrification technology

Pending Publication Date: 2022-05-17
内蒙古科技大学包头师范学院
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Problems solved by technology

However, the chemical precipitation method is one-time treatment, and the ammonia nitrogen in the wastewater is often difficult to meet the discharge standard.
[0012] 3. Although the recovered MAP can be used as a slow-release fertilizer for plant growth, etc., there is no actual large-scale application in my country

Method used

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  • Chemical and biological method for synchronous resource treatment of three kinds of rare earth metallurgical wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The chemical and biological methods for synchronous resource management of three kinds of rare earth metallurgical wastewater, the process flow chart is as follows figure 1 As shown, starting from the upper left, the rare earth ammonium sulfate wastewater, magnesium sulfate wastewater, and sodium phosphate wastewater were collected first, and the NH 4 + , Mg 2+ and PO 4 3- The concentrations are: NH 4 + 0.2875mol / L, Mg 2+ 0.7225mol / L, PO 4 3- 0.3279mol / L. Based on the volume of ammonium sulfate wastewater to be treated at 500mL, according to the NH 4 + : Mg 2+ :PO 4 3- The amount ratio of the substances is 1:1:1, and the volume V of magnesium sulfate wastewater and sodium phosphate wastewater needs to be added to calculate 1 , V 2 . The calculation process is as follows: NH 4 + Concentration is 0.2875mol / L, to treat 500mL ammonium sulfate wastewater, NH 4 + The amount of substance is 143.75mmoL; Need the volume of magnesium sulfate waste water (Mg 2...

Embodiment 1-1

[0086] Same as Example 1, the difference is that the fermentation temperature is 30°C, and the fermentation time is 60 minutes. After testing, the concentration of ammonia nitrogen in the treated wastewater is 13.14mg / L, and the removal rate of ammonia nitrogen is 86.23%.

Embodiment 1-2

[0088] Same as Example 1, the difference is that the fermentation temperature is 35° C., and the fermentation time is 48 minutes. After testing, the concentration of ammonia nitrogen in the treated wastewater is 14.61 mg / L, and the removal rate of ammonia nitrogen is 84.69%.

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Abstract

The invention discloses a chemical and biological method for synchronous resource treatment of three kinds of rare earth metallurgical wastewater, and belongs to the technical field of rare earth industrial environment protection. Specifically, ammonia nitrogen wastewater, magnesium sulfate wastewater and sodium phosphate wastewater are subjected to mixing proportion blending, the mixing sequence and the pH value of a system are controlled, and then chemical precipitation is performed, so that unified treatment of phosphorus removal, nitrogen removal and magnesium reduction is achieved, valuable elements in the three kinds of wastewater are fully utilized, MAP is generated and recycled, MHP is prepared through roasting, and the MHP serves as an ammonia nitrogen adsorbent to be reused. The effluent is deeply treated by a biological method, and a nitrobacterium agent is utilized to carry out a specific fermentation process so as to treat residual low-concentration ammonia nitrogen, phosphorus elements and magnesium elements in the wastewater. On the basis of organic combination of chemical precipitation and a biological method, process optimization is carried out, advantage complementation is realized, an economical and efficient practical technology for wastewater treatment is formed, and after wastewater is comprehensively treated, ammonia nitrogen components reach the wastewater discharge standard.

Description

Technical field: [0001] The invention belongs to the technical field of rare earth industrial environmental protection, and specifically relates to chemical and biological methods for synchronous resource management of three kinds of rare earth metallurgical wastewater, mainly aimed at ammonia nitrogen wastewater (ammonium chloride, ammonium sulfate wastewater) and magnesium sulfate wastewater produced by rare earth wet smelting. , alkaline sodium phosphate wastewater, and other chemical and biological integration technologies for simultaneous resource management. Background technique: [0002] Rare earth is an important strategic resource in my country, and its supporting position in various sectors of the national economy is becoming more and more prominent. China's rare earth resources account for 36.4% of the global total, and its output accounts for more than 95% of the world's total rare earth production, while Baotou's rare earth reserves account for 10% of domestic re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C12N1/20C02F103/16C02F101/16C02F101/10C12R1/11C12R1/07C12R1/38C12R1/01
CPCC02F9/00C01B25/451C01B25/34C01C1/022C01C1/026C12N1/20C02F2103/16C02F2101/16C02F2101/101C02F2101/105C02F1/5236C02F1/66C02F3/02C02F3/34Y02W10/10
Inventor 王美荣季喜燕张骁勇雍胜利朱悦然牟保畏姚峰
Owner 内蒙古科技大学包头师范学院
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