Development-free digital printing plate wastewater treatment technique

Abstract

The invention relates to a development-free digital printing plate wastewater treatment technique which comprises the following steps: classifying wastewater, adding concentrated acid wastewater into a concentrated acid wastewater collection tank, mixing into a mixing tank, sending into a reaction tank, adding polyacrylamide, and carrying out pressure filtration to form a filter cake; continuously discharging development fresh water into a conditioning tank which is arranged at one end of a liquid alkali storage tank, adding polyacrylamide into a coagulation tank, reacting, and sending into a sloping plate precipitation tank; filtering through a sand filter system; precipitating, sending into a sand filter tank, filtering the effluent water with quartz sand, and sending into a discharge tank; and sending sludge discharged to the sloping plate precipitation tank into a sludge tank, and carrying out pressure filtration with a plate and frame filter press to form a filter cake. By designing the two classification treatment techniques and increasing the sand filter system, the technique fully utilizes the advantages in chemical reaction and physical treatment, so that the removal rate of the aluminiferous wastewater is up to higher than 90%, and the effluent water satisfies the Sewage Comprehensive Discharge Standard and can be directly recovered for production and secondary treatment.

Description

Technical field [0001] The invention relates to a waste water treatment process, in particular to a waste water treatment process for a flush-free digital printing plate material, which is suitable for the removal treatment process of aluminum ions generated in the plate material production process. Background technique [0002] At present, in the process of producing printing plates, the main feature of the aluminum-containing wastewater generated is that aluminum is an active metal. In the dry air, a carcinogenic oxide film with a thickness of about 50 angstroms is immediately formed on the surface of the aluminum, so that the aluminum will not be further oxidized and can Water-resistant, but aluminum powder is easily combustible when mixed with air, and molten aluminum can react violently with water. Then, aluminum-containing wastewater must be treated. At present, there are many treatment technologies, and chemical precipitation, ion exchange, etc. are commonly used. With the...

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Problems solved by technology

[0002] At present, in the process of producing printing plates, the main feature of aluminum-containing wastewater is that aluminum is an active metal. In dry air, a carcinogenic oxide film with a thickness of about 50 angstroms is immediately formed on the surface of aluminum, so that aluminum will not be further oxidized and can Water resistance, but aluminum powder mixed with air is extremely flammable, and molten aluminum can react violently with water, so aluminum-containing wastewater must be treated. At present, there are many treatment technologies, such as chemical precipitation, ion exchange, etc., are commonly used. With the increasing awareness of the protection of the global environment and the increasingly stringent national environmental protection policies, it is an urgent problem to seek a treatment process with low treatment cost, clean treatment and recycling of wastewater.

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