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A kind of treatment method of pyrophosphate-citric acid zinc-nickel alloy electroplating wastewater

A technology of electroplating wastewater and zinc citrate, which is applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of nickel and zinc, low efficiency of lemon root, high treatment cost, etc., and achieve The effect of low processing cost, simple process and good market application prospect

Active Publication Date: 2021-10-26
GUANGZHOU ULTRA UNION CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Pyrophosphate-citric acid system zinc-nickel alloy electroplating wastewater contains trisodium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, it is necessary to add a large amount of oxidant to destroy the coordination of citric acid agent, the treatment cost is high, and it is difficult to effectively remove citrate in winter when the temperature is low
Therefore, if the traditional oxidation-hydroxide precipitation method is used to treat zinc-nickel alloy electroplating wastewater containing citric acid, the content of nickel and zinc after treatment often cannot meet the requirements of GB21900-2008 "Electroplating Pollutant Discharge Standard"

Method used

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  • A kind of treatment method of pyrophosphate-citric acid zinc-nickel alloy electroplating wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Treatment of zinc-nickel alloy electroplating wastewater containing potassium pyrophosphate 6000 mg / L

[0046] Step 1, add ferrous chloride and calcium chloride

[0047] The zinc-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the feeding tank, the tank liquid is stirred with a mixer, the pH is adjusted to 7 by adding hydrochloric acid, and 18L of ferrous chloride solution and 40L of calcium chloride solution are added to each ton of wastewater.

[0048] Step 2. Precipitation of complexing agents and heavy metal ions

[0049] The wastewater in the feeding tank flows into the sedimentation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 10-11.5 by adding lime emulsion, the ferrous ion and the calcium ion cooperate to precipitate citrate, and the calcium ion and pyrophosphate form calcium pyrophosphate precipitation, from the compound The nickel ions and zinc ions released from the ions form ...

Embodiment 2

[0058] Embodiment 2: process the zinc-nickel alloy electroplating wastewater containing potassium pyrophosphate 2500 mg / L

[0059] Step 1, add ferrous chloride and calcium chloride

[0060] The zinc-nickel alloy electroplating wastewater is transported from the wastewater regulating tank to the feeding tank, the tank liquid is stirred with a mixer, the pH is adjusted to 7 by adding hydrochloric acid, and 10L of ferrous chloride solution and 20L of calcium chloride solution are added to each ton of wastewater.

[0061] Step 2. Precipitation of complexing agents and heavy metal ions

[0062] The wastewater in the feeding tank flows into the sedimentation tank, the tank liquid is stirred with a mixer, the pH is adjusted to 10-11.5 by adding lime emulsion, the ferrous ion and the calcium ion cooperate to precipitate citrate, and the calcium ion and pyrophosphate form calcium pyrophosphate precipitation, from the compound The nickel ions and zinc ions released from the ions form pre...

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Abstract

The invention discloses a treatment method for pyrophosphate-citrate zinc-nickel alloy electroplating wastewater. Ferrous chloride and calcium chloride are added to the wastewater, the pH is adjusted to 10-11.5 with lime emulsion, and ferrous ions and calcium ions are co-precipitated Citric acid complexing agent, calcium ions precipitate pyrophosphate, nickel ions and zinc ions generate corresponding hydroxide and other precipitates, and phosphate generates nickel phosphate and zinc phosphate precipitates. Add oxidants to oxidize other organic matter and adjust the pH of wastewater to 6-9. The treatment results meet the requirements of GB 21900-2008 "Electroplating Pollutant Discharge Standard". The invention establishes a new method for removing carboxyl-containing organic acid complexing agents in waste water by precipitating ferrous ions and calcium ions. The process is simple and easy, the treatment cost is low, and the method has good market application prospects.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a treatment method for pyrophosphate-citric acid system zinc-nickel alloy electroplating wastewater. Background technique [0002] Pyrophosphate-citric acid system zinc-nickel alloy electroplating wastewater contains trisodium citrate complexing agent, citrate root has strong oxidation resistance, and the efficiency of destroying lemon root by traditional oxidation method is low. Generally, it is necessary to add a large amount of oxidant to destroy the coordination of citric acid agent, the treatment cost is high, and it is difficult to effectively remove citrate in winter when the temperature is low. Therefore, the traditional oxidation-hydroxide precipitation method is used to treat zinc-nickel alloy electroplating wastewater containing citric acid, and the content of nickel and zinc after treatment often does not meet the requirements of GB21900-2008 "...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/34C02F101/30C02F101/20C02F101/10
CPCC02F1/56C02F1/58C02F1/62C02F1/66C02F1/722C02F1/76C02F9/00C02F2101/105C02F2101/20C02F2101/30C02F2101/34C02F2103/16C02F2209/04
Inventor 郭崇武赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD