Method for treating electroplating mixed wastewater

Abstract

The invention relates to a treatment method of mixed electroplating wastewater, and is characterized in that: organic compounds in the mixed electroplating wastewater are decomposed for a plurality of times through decomposition and reduction reaction, internal electrolytic reduction reaction, neutralization and precipitation, compound absorption, etc., and the decomposition process comprises intensified demulsification, electric field flocculation, hydroxyl group decomposition, molecular absorption and ion exchange; heavy metals are reduced for a plurality of times: ferrous ion reduction, hydrogen reduction and neutralized and precipitated. The treatment devices of the method of the invention are simple and can be easily obtained, the operation is simple and convenient, the land occupancy is small and the construction investment is small. The treatment agent is prepared from normal materials and devices, and the treatment expense can be saved by 30 to 50 percent compared with traditional methods. The invention can be used for treating mixed electroplating wastewater with coexisted copper, nickel, zinc, chromium and COD Cr, with a removal rate generally higher than 96 percent. Thetreatment method of the invention has the advantages of simplicity, short process, small investment, low running expense, high removal efficiency, good treatment effect, and wide popularization value, being bound to have remarkable social and economic benefits.

Description

technical field

[0001] The invention relates to an improvement of a treatment method for electroplating industrial production wastewater, in particular to a treatment method for electroplating mixed wastewater, which belongs to the field of industrial wastewater treatment. Background technique

[0002] Since the reform and opening up, my country's basic industry, light industry, daily hardware industry, and electronics industry have been greatly developed, and the central position of China's manufacturing industry in the world has become more and more obvious. The great development of the manufacturing industry will inevitably promote the development of the electroplating industry. At present, my country's electroplating enterprises have already exceeded 10,000, especially in coastal areas.

[0003] With the development of the electroplating industry, the treatment of electroplating wastewater has become a very prominent problem. Electroplating wastewater is industrial wast...

Examples

Embodiment 1

[0065] Embodiment 1: Laboratory treatment of electroplating mixed wastewater

[0066] 1. Electroplating mixed wastewater sample

[0067] Shenzhen ×× Environmental Protection Technology Co., Ltd. provided 1520ml of electroplating mixed wastewater samples, including: 400ml of cyanide-containing wastewater, 1100ml of chromium-containing wastewater, and 20ml of electroplating pre-treatment wastewater.

[0068] Tested by the Environmental Protection Monitoring Station of Jilin City, the electroplating mixed wastewater sample: Contains Cr 6+ 168.038mg / L; containing Cu 0.77mg / L; containing Ni 0.15mg / L; due to Cr 6+ High content interferes with CODcr detection, and CODcr cannot be detected.

[0069] 2. Preparatory work before the test

[0070] Appliances: 2000ml glass cup for decomposition and reduction tank; small air pump; 1000ml plastic cup for internal electrolytic reduction tank, filling: 0.5L of cast iron chips with a particle size of 1-10mm, 0.5L of metallurgical coke with ...

Embodiment 2

[0086] Example 2: Simulated treatment of electroplating mixed wastewater

[0087] This embodiment is a simulated treatment test for the continuous treatment process of electroplating mixed wastewater.

[0088] 1. Electroplating mixed wastewater sample

[0089] From the sewage station of Shenzhen ××× Metal Products Factory, about 500M of electroplating mixed wastewater samples were taken out from the 14 electroplating production lines of the factory. 3 . Among them: comprehensive wastewater 300M 3 (containing copper, nickel, zinc, chromium), cyanide-containing wastewater 50M 3 , chromium-containing wastewater 80M 3 , aluminum oxidation wastewater 70M 3 .

[0090]Tested by Shenzhen XX Huanke Testing Technology Co., Ltd., the electroplating mixed wastewater sample: contains Cu59.5mg / L; contains Ni 13.5mg / L; contains Zn 17.0mg / L; CODcr 318mg / L; contains Cr 6+ 0.264mg / L.

[0091] 2. Preparatory work before the test

[0092] Appliances: 2000ml measuring cylinder for decompo...

Embodiment 3

[0104] Embodiment 3: Dynamic continuous treatment of electroplating mixed wastewater

[0105] 1. Sample source of electroplating mixed wastewater:

[0106] The electroplating mixed wastewater sample is provided by the wastewater station of Shenzhen ××× Products Factory, of which: comprehensive wastewater: 300M per day 3 , accounting for 60% of the total wastewater discharge, 120L samples were taken; chromium-containing wastewater: 80M per day 3 , accounting for 16% of the total amount of discharged wastewater, pumping 32L; cyanide-containing wastewater: 50M per day 3 , accounting for 10% of the total amount of wastewater discharged, pumping 20L; aluminum oxidation wastewater: 70M per day 3 , accounting for 14% of the total amount of wastewater discharged, pumping 28L. A total of 200L was packed in barrels and shipped to Jilin City, and then made into a 180L electroplating mixed wastewater sample according to the original wastewater discharge ratio.

[0107] Tested by the E...

technical field

[0001] The invention relates to an improvement of a treatment method for electroplating industrial production wastewater, in particular to a treatment method for electroplating mixed wastewater, which belongs to the field of industrial wastewater treatment. Background technique

[0002] Since the reform and opening up, my country's basic industry, light industry, daily hardware industry, and electronics industry have been greatly developed, and the central position of China's manufacturing industry in the world has become more and more obvious. The great development of the manufacturing industry will inevitably promote the development of the electroplating industry. At present, my country's electroplating enterprises have already exceeded 10,000, especially in coastal areas.

[0003] With the development of the electroplating industry, the treatment of electroplating wastewater has become a very prominent problem. Electroplating wastewater is industrial wast...

Examples

Embodiment 1

[0065] Embodiment 1: Laboratory treatment of electroplating mixed wastewater

[0066] 1. Electroplating mixed wastewater sample

[0067] Shenzhen ×× Environmental Protection Technology Co., Ltd. provided 1520ml of electroplating mixed wastewater samples, including: 400ml of cyanide-containing wastewater, 1100ml of chromium-containing wastewater, and 20ml of electroplating pre-treatment wastewater.

[0068] Tested by the Environmental Protection Monitoring Station of Jilin City, the electroplating mixed wastewater sample: Contains Cr 6+ 168.038mg / L; containing Cu 0.77mg / L; containing Ni 0.15mg / L; due to Cr 6+ High content interferes with CODcr detection, and CODcr cannot be detected.

[0069] 2. Preparatory work before the test

[0070] Appliances: 2000ml glass cup for decomposition and reduction tank; small air pump; 1000ml plastic cup for internal electrolytic reduction tank, filling: 0.5L of cast iron chips with a particle size of 1-10mm, 0.5L of metallurgical coke with ...

Embodiment 2

[0086] Example 2: Simulated treatment of electroplating mixed wastewater

[0087] This embodiment is a simulated treatment test for the continuous treatment process of electroplating mixed wastewater.

[0088] 1. Electroplating mixed wastewater sample

[0089] From the sewage station of Shenzhen ××× Metal Products Factory, about 500M of electroplating mixed wastewater samples were taken out from the 14 electroplating production lines of the factory. 3 . Among them: comprehensive wastewater 300M 3 (containing copper, nickel, zinc, chromium), cyanide-containing wastewater 50M 3 , chromium-containing wastewater 80M 3 , aluminum oxidation wastewater 70M 3 .

[0090]Tested by Shenzhen XX Huanke Testing Technology Co., Ltd., the electroplating mixed wastewater sample: contains Cu59.5mg / L; contains Ni 13.5mg / L; contains Zn 17.0mg / L; CODcr 318mg / L; contains Cr 6+ 0.264mg / L.

[0091] 2. Preparatory work before the test

[0092] Appliances: 2000ml measuring cylinder for decompo...

Embodiment 3

[0104] Embodiment 3: Dynamic continuous treatment of electroplating mixed wastewater

[0105] 1. Sample source of electroplating mixed wastewater:

[0106] The electroplating mixed wastewater sample is provided by the wastewater station of Shenzhen ××× Products Factory, of which: comprehensive wastewater: 300M per day 3 , accounting for 60% of the total wastewater discharge, 120L samples were taken; chromium-containing wastewater: 80M per day 3 , accounting for 16% of the total amount of discharged wastewater, pumping 32L; cyanide-containing wastewater: 50M per day 3 , accounting for 10% of the total amount of wastewater discharged, pumping 20L; aluminum oxidation wastewater: 70M per day 3 , accounting for 14% of the total amount of wastewater discharged, pumping 28L. A total of 200L was packed in barrels and shipped to Jilin City, and then made into a 180L electroplating mixed wastewater sample according to the original wastewater discharge ratio.

[0107] Tested by the E...

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