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A method for treating phosphorous/phosphine-containing electroplating wastewater by using electroplating sludge

A technology of electroplating wastewater and electroplating sludge, which is applied in the directions of sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of increasing the production of electroplating sludge, total phosphorus and COD Problems such as excessive cost and waste of resources can achieve the effect of improving sludge recycling rate, reducing sludge production and chemical dosage, and improving wastewater reuse rate

Active Publication Date: 2016-10-19
石泰山
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional treatment method of electroplating phosphorus / phosphine electroplating wastewater is mainly to collect phosphorus / phosphine electroplating wastewater separately, and use calcium hydroxide or calcium chloride or iron salt or aluminum salt to precipitate phosphorus / phosphine electroplating wastewater. / Phosphonate and heavy metal ions, although the wastewater has been treated, it wastes resources while increasing the amount of electroplating sludge, or use a heavy metal ion capture agent with stronger coordination properties to remove heavy metal ions, or electrolysis / micro-electrolysis to remove wastewater Heavy metal ions in the medium, but the total phosphorus and COD are easy to exceed the standard and the cost is high

Method used

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  • A method for treating phosphorous/phosphine-containing electroplating wastewater by using electroplating sludge
  • A method for treating phosphorous/phosphine-containing electroplating wastewater by using electroplating sludge
  • A method for treating phosphorous/phosphine-containing electroplating wastewater by using electroplating sludge

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Effect test

Embodiment 1

[0033] Coke-containing waste water is collected separately in the coke-copper waste water collection tank, after adjusting the water quality and quantity. Pump the coke copper wastewater into the chromium-containing wastewater sludge concentration tank, pump the wastewater into the depth of 1 / 2 to 3 / 4 of the concentration tank, keep the rising flow rate of the wastewater at 0.25 to 2.5m / h, use a pH meter (pH<8.5 ) to control the pumping volume of coke copper wastewater.

[0034] Batch operation can also be operated continuously to control the ratio of sludge to wastewater to 1:1~1:5. During continuous operation, the pH control solenoid valve controls the amount of sludge pumped.

[0035] The chemical nickel wastewater is pumped into the nickel-containing sludge concentration tank or the comprehensive sludge concentration tank (the ratio of sludge to wastewater is 1:1~1:10, pH>8.5).

[0036] The phosphorus-containing cyanide-free electroplating is pumped into the comprehensiv...

Embodiment 2

[0040] There is a chemical treatment system for new construction or renovation. The sludge in the sedimentation tank or sludge concentration tank is mixed with phosphorus-containing wastewater in a certain proportion (the ratio of sludge to wastewater is 1:2), and then enters the reaction tank. The pH meter is used to control the sludge or waste water. Phosphorus / phosphine-containing electroplating wastewater is added, and the mud-water mixture enters the sedimentation tank for sedimentation. The effluent enters the comprehensive collection pool or the corresponding waste water collection pool. The sludge enters the sludge thickening tank to concentrate.

[0041] In order to make full use of the sludge during operation, keep the sludge return rate at 25% to 300%.

[0042] The concentration of phosphate in the effluent is <5mg / L.

Embodiment 3

[0044] Phosphorus-containing waste bath is treated before electroplating, the ratio of sludge to bath is 5:1-10:10, the total phosphorus in the effluent is <5mg / L, and the total metal ion concentration is <5mg / L.

[0045] Because the present invention makes full use of the generalized acid-base in electroplating wastewater, electroplating sludge is used to treat phosphorous / phosphine-containing electroplating wastewater, thereby reducing the addition of salinity and alkali in wastewater treatment, reducing sludge output and chemical dosage, and significantly reducing the dissolution rate in wastewater. Non-toxic solids, reduce the amount of electroplating sludge, reduce the cost of wastewater treatment, reduce the salt content in wastewater, reduce environmental pollution, improve the recycling rate of wastewater and the recycling rate of electroplating sludge.

[0046] Taking copper wastewater as an example, copper wastewater contains not only copper pyrophosphate, but also po...

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Abstract

The invention relates to a method for treating phosphorus / phosphine-containing electroplating wastewater by utilizing electroplating sludge, and relates to electroplating wastewater treatment and sludge recycling. The method comprises the steps: (1) collecting the phosphorus / phosphine-containing electroplating wastewater into a wastewater collection pond; (2) pumping the phosphorus / phosphine-containing electroplating wastewater and the electroplating sludge in the wastewater treatment pond, in the step (1), into a reaction pond to react, to be specific, enabling the independently collected phosphorus / phosphine-containing electroplating wastewater to react with the corresponding metal sludge, or enabling the mixed phosphorus / phosphine-containing electroplating wastewater and comprehensive sludge to react or react in a crossing manner, wherein besides heavy metal ions, the electroplating sludge also contains ions such as calcium, magnesium, iron, and aluminum added in the electroplating wastewater treatment; forming phosphate / phosphonate metal salt with the relatively low solubility by virtue of the reaction between the metal ions in the electroplating sludge and phosphate / phosphonate radicals in the phosphorus / phosphine-containing electroplating wastewater, so that a purpose of removing phosphorus / phosine and the heavy metal ions can be achieved; and (3) separating the sludge from water. By adopting the method, the output of the electroplating sludge can be reduced, the sludge is prone to press and filter, the water content is relatively low, and the treatment cost is low.

Description

technical field [0001] The invention relates to electroplating wastewater treatment and sludge recycling, in particular to a method for treating phosphorous / phosphine-containing electroplating wastewater by using electroplating sludge. Background technique [0002] The treatment of electroplating wastewater has a separate treatment process and a mixed treatment process. The separation treatment process is to divide the electroplating wastewater into nickel-containing wastewater, chemical nickel wastewater, acid copper wastewater, coke copper wastewater, chromium-containing wastewater, acid-base wastewater, comprehensive wastewater, etc., and collect and classify the wastewater according to the metal ion category; The mixed treatment process is to collect chromium-containing and cyanide-containing wastewater separately, and then mix them with other wastewater after separate reduction and oxidation pretreatment. The separation treatment process is easy to meet the standard st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/58C02F9/04C02F11/00C02F103/16
CPCC02F1/38C02F1/444C02F1/58C02F9/00C02F11/12C02F11/122C02F2101/105C02F2101/18C02F2101/20C02F2101/22C02F2101/30C02F2103/16C02F2303/06
Inventor 石泰山
Owner 石泰山
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