Processing technology for electroplating effluent of heavy metal

Abstract

The invention discloses a processing technology for electroplating effluent of heavy metal. The processing technology comprises an iron-carbon micro electrolysis processing procedure and a sludge circulating and processing procedure, wherein the sludge circulating and processing procedure comprises an agitating tank, a sedimentation basin and an alkali tank which are successively and mutually connected to form sludge circulation; mixed effluent enters a micro electrolysis packed tower to be in contact with spherical iron-carbon composite materials for carrying out micro electrolytic reaction, and an iron-carbon micro electrolysis preprocessing procedure is completed; then, the sludge circulating and processing procedure is performed. The technology disclosed by the invention is simple, the electroplated effluent is not needed to be processed in a stream splitting manner, and all the electroplating effluent needs to be mixed into a stream to be processed. In the technology, except that the pH value is adjusted through acid and alkali, other medicaments are not needed to be added, so that the quantity of the produced sludge is substantially reduced by 50% or above as compared with that of a conventional precipitation method.

Description

technical field

[0001] The invention relates to a process for treating heavy metal electroplating wastewater, and belongs to the field of environmental protection wastewater treatment. Background technique

[0002] A large amount of toxic and harmful chemicals such as strong acid, strong alkali, complexing agent, CN, Cu, Cr, Cd, Ni, Zn are used in the electroplating production process, and electroplating wastewater often contains not only one heavy metal, but more than two kinds of heavy metals ion. In addition, in order to improve the quality of plated parts, the types and quantities of electroplating additives used in electroplating production are increasing, and the components are becoming more and more complex. These additives contain components that have a strong complexation with heavy metal ions, such as: tartaric acid, coke Phosphate, citric acid, ammonia and formaldehyde, etc., discharge a large amount of wastewater that pollutes the environment and endangers human...

Examples

Embodiment 1

[0049] The various index analysis results of the mixed waste water (raw water) and the effluent treated by the process of the present invention are shown in Table 1.

[0050] Table 1. Water quality analysis result before and after process treatment of the present invention

[0051]

[0052] Such as figure 1 As shown, the present invention includes two series treatment procedures: iron-carbon micro-electrolysis pretreatment procedure and sludge recycling treatment procedure. The iron-carbon micro-electrolysis pretreatment process mainly includes a micro-electrolysis packing tower 1 filled with a large amount of spherical iron-carbon composite materials, and the bottom of the micro-electrolysis packing tower 1 is fed with air for aeration, and the aeration rate is 5L / min. The sludge circulation treatment process is mainly composed of a stirring tank 2, a sedimentation tank 3 and an alkali tank 4.

[0053] After the various wastewater discharged from the electroplating plant...

Embodiment 2

[0056] as attached figure 1 Shown is a heavy metal electroplating wastewater treatment process, the devices involved in this process include an iron-carbon micro-electrolysis treatment device and a sludge circulation treatment device; the iron-carbon micro-electrolysis treatment device includes a micro-electrolysis packing tower 1, and the micro-electrolysis packing tower 1 Filled with a large number of spherical iron-carbon composite materials, the bottom of the micro-electrolysis packed tower 1 is vented with air for aeration; the sludge circulation treatment device includes a stirring tank 2, a sedimentation tank 3 and an alkali tank 4, and the stirring tank 2, sedimentation tank 3 and alkali The tanks 4 are connected to each other in turn to form a sludge circulation; the micro-electrolysis packing tower 1 is connected to the stirring tank 2 .

[0057] A heavy metal electroplating wastewater treatment process, comprising the following steps:

[0058] 1) Wastewater collect...

technical field

[0001] The invention relates to a process for treating heavy metal electroplating wastewater, and belongs to the field of environmental protection wastewater treatment. Background technique

[0002] A large amount of toxic and harmful chemicals such as strong acid, strong alkali, complexing agent, CN, Cu, Cr, Cd, Ni, Zn are used in the electroplating production process, and electroplating wastewater often contains not only one heavy metal, but more than two kinds of heavy metals ion. In addition, in order to improve the quality of plated parts, the types and quantities of electroplating additives used in electroplating production are increasing, and the components are becoming more and more complex. These additives contain components that have a strong complexation with heavy metal ions, such as: tartaric acid, coke Phosphate, citric acid, ammonia and formaldehyde, etc., discharge a large amount of wastewater that pollutes the environment and endangers human...

Examples

Embodiment 1

[0049] The various index analysis results of the mixed waste water (raw water) and the effluent treated by the process of the present invention are shown in Table 1.

[0050] Table 1. Water quality analysis result before and after process treatment of the present invention

[0051]

[0052] Such as figure 1 As shown, the present invention includes two series treatment procedures: iron-carbon micro-electrolysis pretreatment procedure and sludge recycling treatment procedure. The iron-carbon micro-electrolysis pretreatment process mainly includes a micro-electrolysis packing tower 1 filled with a large amount of spherical iron-carbon composite materials, and the bottom of the micro-electrolysis packing tower 1 is fed with air for aeration, and the aeration rate is 5L / min. The sludge circulation treatment process is mainly composed of a stirring tank 2, a sedimentation tank 3 and an alkali tank 4.

[0053] After the various wastewater discharged from the electroplating plant...

Embodiment 2

[0056] as attached figure 1 Shown is a heavy metal electroplating wastewater treatment process, the devices involved in this process include an iron-carbon micro-electrolysis treatment device and a sludge circulation treatment device; the iron-carbon micro-electrolysis treatment device includes a micro-electrolysis packing tower 1, and the micro-electrolysis packing tower 1 Filled with a large number of spherical iron-carbon composite materials, the bottom of the micro-electrolysis packed tower 1 is vented with air for aeration; the sludge circulation treatment device includes a stirring tank 2, a sedimentation tank 3 and an alkali tank 4, and the stirring tank 2, sedimentation tank 3 and alkali The tanks 4 are connected to each other in turn to form a sludge circulation; the micro-electrolysis packing tower 1 is connected to the stirring tank 2 .

[0057] A heavy metal electroplating wastewater treatment process, comprising the following steps:

[0058] 1) Wastewater collect...

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