Method for removing ammonia nitrogen in electroplating wastewater

A technology for electroplating wastewater and ammonia nitrogen, which is applied in separation methods, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve problems such as secondary pollution, and achieve the effect of promoting the adsorption process, simplifying the process, and restoring the adsorption capacity.

Active Publication Date: 2015-05-06
南京台兴汽车零部件制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a method for removing ammonia nitrogen in electroplating wastewater, using modified bentonite to quickly and conveniently remove ammonia nitrogen in electroplating wastewater under microwave radiation, and at the same time, it can be regenerated and modified Bentonite, recovery of ammonia nitrogen, to avoid the problem of secondary pollution

Method used

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  • Method for removing ammonia nitrogen in electroplating wastewater
  • Method for removing ammonia nitrogen in electroplating wastewater
  • Method for removing ammonia nitrogen in electroplating wastewater

Examples

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Effect test

Embodiment 1

[0038] A, preparation of sodium bentonite particles

[0039] Take 100g of natural bentonite, slowly add 500mL of 4% sodium nitrate solution under rapid stirring, raise the temperature to 50°C and stir for 12 hours. Then add 30 g of coal powder and 5 g of starch, and stir for 12 hours; filter the suspension to obtain a filter cake, and wash the filter cake with 100 mL of deionized water to remove nitrate ions. Place the filter cake in a constant temperature drying oven at 90°C to dry to constant weight, then transfer to a muffle furnace for calcination at 900°C for 3 hours; after calcination, the solid particles are cooled and sieved through a sieve, and 8-15 mesh particles are selected for use .

[0040] B. Treatment of ammonia nitrogen wastewater

[0041] The above-mentioned 50g sodium-based bentonite particles are packed into a 5cm diameter, and the obtained bed height is 20cm. Place the bed section in a microwave oven, and control the temperature to 80°C by adjusting the...

Embodiment 2

[0045] A. Preparation of aluminum pillared bentonite particles

[0046] Slowly add 100mL of NaOH aqueous solution with a mass concentration of 1mol / L dropwise into 100mL of an aluminum nitrate solution with a mass concentration of 0.5mol / L, and the obtained aluminum hydroxide columnizer is aged for 3 days, and then slowly added 100g of sodium bentonite prepared according to Example 1 was put into the above-mentioned aluminum hydroxide columning agent, and allowed to stand for 12 hours. Continue to add 20g polyethylene and 3g gelatin, and stir for 12 hours; filter the suspension to obtain a filter cake, wash the filter cake with 100mL deionized water, and wash away the nitrate ions; place the filter cake in a constant temperature drying oven at 100°C to dry to constant weight , transferred to a muffle furnace for calcination at 800°C for 4 hours; after calcination, the solid particles were cooled, passed through a sieve for sieving, and 8-15 mesh particles were selected for use...

Embodiment 3

[0052] A. Preparation of iron pillared bentonite particles

[0053] 50 mL of NaOH aqueous solution with a mass concentration of 1 mol / L was slowly added dropwise into 50 mL of a ferric nitrate solution with a mass concentration of 0.5 mol / L, and the obtained ferric hydroxide columnar agent was left to age for 2 days. Then slowly add 100 g of the sodium bentonite prepared according to Example 1 to the ferric hydroxide columning agent while stirring, and let it stand for 12 hours. Continue to add 20g of walnut shell powder and 3g of epoxy resin adhesive, and stir for 12 hours. Filter the suspension to obtain a filter cake, wash the filter cake with 100mL deionized water to remove nitrate ions; place the filter cake in a constant temperature drying oven at 100°C to a constant weight, transfer to a muffle furnace and calcinate at 850°C for 4 hours . After calcination, the solid particles are cooled, sieved through a sieve, and 8-15 mesh particles are selected for use.

[0054] ...

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Abstract

The invention belongs to the technical field of industrial waste water treatment, and discloses a method for removing ammonia nitrogen in electroplating wastewater. The method includes the following steps: (1) adjusting the pH value of the raw material of electroplating wastewater containing ammonia nitrogen to 4-6, so that the ammonia nitrogen mainly exist in the form of NH4<+>; (2) passing the pretreated electroplating wastewater through a modified bentonite particles bed under microwave irradiation at constant temperature and constant speed; and (3) regenerating the on the adsorption saturated modified bentonite particles bed layer by dilute acid. The invention employs modified bentonite as an adsorbent, which has larger capacity and better selectivity compared with traditional activated carbon and zeolite adsorbent; microwave radiation can promote the adsorption process, and has no strict requirement on water quality; the regeneration can completely restore the adsorption capacity of the bentonite, and high concentration ammonia nitrogen in the regeneration liquid can be recycled, so as to avoid secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for removing ammonia nitrogen in electroplating wastewater. Background technique [0002] Ammonia nitrogen refers to the free ammonia (NH 3 ) and ammonium ions (NH 4 + ) in the form of nitrogen. Ammonia nitrogen in wastewater is one of the main substances that cause water eutrophication and environmental pollution. It can cause a series of problems such as the reproduction of algae and other microorganisms in the water, the decrease of dissolved oxygen in the water, and the increase in the amount of chlorine used for sterilization of circulating water. A variety of electroplating electroplating processes will add ammonia water, ammonium chloride and other chemicals, resulting in a large amount of high-concentration ammonia nitrogen wastewater. At present, there are few reference materials and engineering examples on the design spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/30B01J20/12B01J20/34C02F101/16C02F103/16
Inventor 沈德华范正芳蔡大牛康佑军秦晴高娟李瑞鹏张伟宁军毛鸿浩吴冬飞纪国庆裴宁黄亚俊
Owner 南京台兴汽车零部件制造有限公司
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