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Method for simultaneously removing sulfate and ammonia nitrogen in smelting wastewater

A sulfate and wastewater technology, which is applied in metallurgical wastewater treatment, chemical instruments and methods, water aeration, etc., can solve the problems of difficult smelting wastewater treatment and high operating costs, and achieves small footprint, reduced investment, and ancillary equipment little effect

Inactive Publication Date: 2018-07-27
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of the existing smelting wastewater containing sulfate, ammonia nitrogen and metal ions, which are difficult to treat and have high operating costs, and provides a method for synchronously removing sulfate and ammonia nitrogen in smelting wastewater

Method used

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  • Method for simultaneously removing sulfate and ammonia nitrogen in smelting wastewater
  • Method for simultaneously removing sulfate and ammonia nitrogen in smelting wastewater
  • Method for simultaneously removing sulfate and ammonia nitrogen in smelting wastewater

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specific Embodiment approach 1

[0019] Specific implementation mode one: the method for synchronously removing sulfate and ammonia nitrogen in the smelting waste water of the present embodiment is carried out according to the following steps:

[0020] 1. Pretreatment 1: Add sodium hydroxide solution to the smelting wastewater, so that the pH of the wastewater reaches 9-10, and there is hydroxide precipitation, filter, remove the hydroxide precipitation, and obtain the filtrate;

[0021] 2. Pretreatment 2: Continue to add sodium hydroxide solution to the filtrate obtained in step 1, so that the pH of the filtrate is 12 to 13, and a hydroxide precipitate is produced. After standing, the hydroxide precipitate in the lower layer is removed to obtain the upper layer. Serum;

[0022] 3. Chemical precipitation: Add solid calcium hydroxide to the supernatant obtained in step 2, so that the concentration of calcium hydroxide in the supernatant is 29.5 to 30.5g / L, and calcium sulfate precipitation is produced. Filter ...

specific Embodiment approach 2

[0024] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass percent concentration of the sodium hydroxide solution in step 1 is 10-12%; the others are the same as Embodiment 1.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the pH of the wastewater in step 1 reaches 9.5; the others are the same as Embodiment 1 or 2.

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Abstract

The invention relates to a method for simultaneously removing sulfate and ammonia nitrogen in smelting wastewater. The method for simultaneously removing the sulfate and ammonia nitrogen in the smelting wastewater aims at solving the technical problems of high difficulty in treatment of smelting wastewater containing sulfate, ammonia nitrogen and metal ions and high running cost in the prior art.The method comprises the following steps of pretreating the smelting wastewater by a sodium hydroxide solution twice; adding calcium hydroxide to chemically precipitate; finally, stripping to remove the ammonia nitrogen in the wastewater, so as to simultaneously remove the sulfate, ammonia nitrogen and metal ions. After the smelting wastewater is treated by the method, the removal rate of sulfatereaches 99.99%; the removal rate of ammonia nitrogen reaches 99.52%; the removal rate of total dissolved solids reaches 98.23%. The method has the advantages that the investment is small, the runningcost is low, and the method can be used for the wastewater treatment and circulation utilization.

Description

technical field [0001] The invention relates to a method for removing sulfate and ammonia nitrogen in smelting wastewater, belonging to the field of industrial wastewater treatment. Background technique [0002] Water is an indispensable resource in human survival and production activities. With the growth of population, economic development and improvement of people's living standards, human demand for water resources is increasing. But water resource is a limited and irreplaceable precious resource. The shortage of water resources has become a common problem in our country, and the pollution of water resources makes this problem more serious. Wastewater containing sulfate and ammonia nitrogen will be produced during the metal hydrometallurgy process. At the same time, due to the complex composition of ore, the wastewater containing sulfate and ammonia nitrogen will also contain other metal ions, such as sodium, magnesium, calcium, zinc, manganese, etc. Wastewater is acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/001C02F1/5236C02F1/66C02F7/00C02F9/00C02F2001/007C02F2103/16C02F2301/08
Inventor 程庆锋吴亚岚黄杨能子礼超
Owner CHENGDU UNIV OF INFORMATION TECH
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