Nickel-containing electroplating wastewater treatment device

Abstract

The invention discloses a nickel-containing electroplating wastewater treatment device comprising a wastewater pretreatment system, a first storage tank, a low-temperature vacuum concentration system,a security filter, a second storage tank, a nanofiltration device and an MBR device, and a method comprises the following steps: S1, filtering; S2, precipitating; S3, separating by virtue of the low-temperature vacuum concentration system; S4, temporarily storing; S5, nanofiltering; and S6, carrying out microbial decomposition. The system is simple to construct, the treatment device is basicallydivided into seven modules, after nickel-containing electroplating wastewater is sequentially treated by the seven modules, the water quality meets the discharge standard; the system is compact and reasonable in facility layout and small in occupied area, all process modules are optimized, the optimal operation condition is found, and the treatment efficiency and operation energy consumption are greatly improved; compared with a traditional treatment method, sludge is not generated, nickel ions basically exist in waste liquid discharged by the low-temperature vacuum concentration device completely, and recycling treatment can be conducted.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a nickel-containing electroplating wastewater treatment device. Background technique [0002] At present, nickel-containing electroplating wastewater mainly comes from aqueduct waste liquid and ferry piece rinsing water in the nickel plating production process. Ferry piece rinsing water is the main source of electroplating wastewater. Nickel plating wastewater is treated with nickel sulfate and nickel chloride. The main free state nickel, and various complexing agents need to be added due to the production process, and form more stable acidic complex nickel such as TA-Ni, CA-Ni, SP-Ni with Ni2+ in the wastewater, making nickel-containing wastewater difficult to effectively Although nickel is one of the trace elements necessary for living organisms, excessive nickel will block the growth and development of plants, affect the normal growth and metabolism of plants, and...

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Problems solved by technology

[0003] The treatment technology of electroplating nickel-containing wastewater can be divided into three categories according to different principles: chemical method, physical chemical method and biological treatment method. The use of chemical methods to treat nickel-containing electroplating wastewater mainly includes traditional chemical precipitation. method, new process ferrite method, and high-efficiency heavy metal chelation precipitation method, among which chemical precipitation method includes hydroxide precipitation method and sulfide precipitation method. The traditional chemical precipitation method has mature technology and low investment in the treatment of nickel-containing electroplating wastewater. , low treatment cost and many other advantages, but a large amount of sludge will be produced during the reaction process, and even cause secondary pollution. The ferric oxide method is to add ferrous sulfate to the wastewater, and FeSO4 can make various heavy metal ions form ferrite crystals For precipitation, the general formula of iron body is FeO.Fe2O3. Ni2+ in wastewater can occupy the lattice of Fe2+ to form co-precipitation and be removed. Ferrite method for nickel-containing electroplating wastewater has the advantages of simple treatment equipment, less investment, and recyclable sediment. and other advantages, but cannot reach the discharge standard of 0.5mg / L at one time. The high-efficiency heavy metal chelation precipitation method uses a new type of precipitant—heavy metal chelating agent. The heavy metal chelating agent has a good trapping effect on Ni2+. Under certain conditions, the removal rate of Ni2+ in wastewater by heavy metal chelating agents can reach more than 98.5%, but the cost of using metal chelating agents is relatively high, and a large amount of sludge will be generated. The understanding of the reaction kinetics between heavy metals is not sufficient, and biosorbents with large adsorption capacity are yet to be developed, and there is still a long way to go before they can be widely used in industry.

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