Treatment and resource recovery method for chromium and ammonia nitrogen in electroplating wastewater

A technology of electroplating wastewater and recycling method, which is applied in the directions of metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of application limitation, high treatment cost, poor treatment effect of ammonia nitrogen pollutants, etc. The effect of high adsorption capacity and simple preparation process

Pending Publication Date: 2020-05-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conventional heavy metal metal treatment technology has a poor treatment effect on the removal of ammonia nitrogen pollutants in electroplating wastewater. Reverse osmosis, electrodialysis, activated carbon adsorption, etc. remove heavy metals and also have a good removal effect on ammonia nitrogen.
Chinese patent CN110357198 discloses an adsorption material for low-concentration ammonia-nitrogen w

Method used

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  • Treatment and resource recovery method for chromium and ammonia nitrogen in electroplating wastewater
  • Treatment and resource recovery method for chromium and ammonia nitrogen in electroplating wastewater
  • Treatment and resource recovery method for chromium and ammonia nitrogen in electroplating wastewater

Examples

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Embodiment 1

[0036] This embodiment provides a method for the treatment and resource recovery of chromium and ammonia nitrogen in electroplating wastewater, comprising the following steps:

[0037] (1) One-time precipitation of metal chromium ions: pipette 100mL electroplating wastewater into a beaker, add 20% sodium hydroxide solution dropwise while stirring, stop adding sodium hydroxide dropwise until the pH of the solution is stable at 9, continue stirring for 30min, and then stop Stir and let stand for 2 hours. After filtering the precipitate, wash the filter cake twice with 3-5 mL of distilled water, combine the filtrate, measure the chromium concentration of the filtrate to be 0.82 mg / L, and obtain 1.37 g of sodium hydroxide chromium precipitate.

[0038] (2) Precipitation of ammonia nitrogen: move the filtrate of step 1 into a beaker, add disodium hydrogen phosphate according to 1 times the amount of ammonia nitrogen (the following are all molar ratios), stir until disodium hydrogen...

Embodiment 2

[0046] Step (1) and step (3) are the same as embodiment 1, and the add-on of disodium hydrogen phosphate is 1.1 times of ammonia nitrogen in step 2, and magnesium chloride is 1 times of ammonia nitrogen, and treatment effect is shown in Table 1.

Embodiment 3

[0048] Step (1) and step (3) are the same as in Example 1, and the addition of magnesium chloride and disodium hydrogen phosphate is 1.1 times of ammonia nitrogen, and the treatment effect is shown in Table 1.

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Abstract

The invention provides a treatment and resource recovery method for chromium and ammonia nitrogen in electroplating wastewater. The treatment and resource recovery method comprises the following steps: dropwise adding an inorganic alkali solution into the electroplating wastewater, and carrying out stirring, standing and filtering to obtain a mixed solution I and a chromium hydroxide precipitate;adding disodium hydrogen phosphate into the obtained mixed solution I, and carrying out stirring until the disodium hydrogen phosphate is dissolved; dropwise adding inorganic alkali liquor while stirring; adding a magnesium chloride solution, and carrying out stirring, standing and filtering to obtain a mixed solution II and a magnesium ammonium phosphate precipitate; and adding nitric acid modified activated carbon into the obtained mixed solution II, conducting oscillating and adsorbing in a water bath, and filtering and recycling the activated carbon. According to the invention, chromium and ammonia nitrogen in the electroplating wastewater are basically removed through two precipitation operations, the obtained precipitate chromium hydroxide can be used for preparing chemical reagentsor paint pigments, and the precipitate magnesium ammonium phosphate can be used as a nitrogen-phosphorus-magnesium slow-release fertilizer; and residual ammonia nitrogen is subjected to deep adsorption treatment through the modified activated carbon. The method develops an effective pollutant treatment and resource recovery treatment technology for the electroplating wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for the treatment and recycling of chromium and ammonia nitrogen in electroplating wastewater. Background technique [0002] The electroplating industry is a traditional heavy polluting industry. The pollutants contain various heavy metal ions, organic matter and ammonia nitrogen. For several metals with high value such as nickel and copper, chemical precipitation, extraction and ion exchange have been partially realized. Or recycle it all. [0003] Chinese patent CN201720029351.4 discloses an electroplating chromium-containing wastewater treatment and recycling equipment, which uses an ion exchange method to control the chromium concentration below 0.5mg / L. However, the conventional heavy metal metal treatment technology has a poor treatment effect on the removal of ammonia nitrogen pollutants in electroplating wastewater. Reverse osmosis, electrodialysis, activated...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/28B01J20/20B01J20/30C02F101/16C02F101/22C02F103/16
CPCB01J20/20C02F1/283C02F1/5236C02F1/66C02F9/00C02F2101/16C02F2101/22C02F2103/16C02F2301/08
Inventor 蒋崇文郭天宇黄滔谢华生谢乐刘有才王偶和
Owner CENT SOUTH UNIV
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