Comprehensive Treatment of electroless nickel plating
wastewater decription:Chemical nickel wastewater due to the electroplating
workshop production, electroless nickel waste water nickel complex, and these
complexes for the outside rail type, a strong complexing properties of nickel.
Complex mainly citric acid, nickel, nickel lactate, malic acid and nickel
Electroless nickel process, the bath, there are a large number of reducing
agents such as: sodium hypophosphite, sodium hypophosphite, PH buffer.
Electroless nickel waste water is generally alkaline, nickel ions exist mainly
in the form of complex nickel. Nickel toxicity, nickel enters the body mainly in
the spinal cord, brain, lungs. Its toxicity to inhibit the enzyme system and
nickel dermatitis. Wastewater seriously polluted water, soil, damaging the
ecological environment, GB21900-2008 “electroplating emission standards for”
strictly limit the maximum allowable emission concentration of total nickel is
0.5mg / I.
Principles and Process Flow Diagram
From shop wastewater through pipes or drains into the waste water collection pool of electroless nickel, promoted to the Willow reaction cell and then through the wastewater lift pump to add the hydrogen peroxide in the reaction cell oxidation and adjust the PH (the PH10-11) between, and then by No. 1 pump delivery to the chemical sedimentation tanks, chemical sedimentation tanks to add flocculant PAC, water flows through the overflow baffle reaction cell, the reaction cell, and add sodium hypochlorite, the heavy metal adsorbent and sulfuric acid to adjust the PH 2 (PH7-8), and then transported to the pump through the 2nd chemical sedimentation tank, add the coagulant chemical sedimentation tanks 2 the PAM, water flows through the overflow in the middle of the pool, the pool in the reaction of 1,2 the installed mixing pump and ORP, PH-line monitoring system, and ultimately the water through the overflow port spill over into the middle basin, the sludge settling down into the conical bottom pool into the filter press pressure dry. The middle of the pool water into the physical filtration adsorption treatment, followed by, respectively, into the quartz sand filters, activated carbon filters, heavy metals capture, removal of precipitation or difficult to get level degradation of small particles suspended solids, and then into the discharge monitoring pool discharge standards .
Principles and Process Flow Diagram
From shop wastewater through pipes or drains into the waste water collection pool of electroless nickel, promoted to the Willow reaction cell and then through the wastewater lift pump to add the hydrogen peroxide in the reaction cell oxidation and adjust the PH (the PH10-11) between, and then by No. 1 pump delivery to the chemical sedimentation tanks, chemical sedimentation tanks to add flocculant PAC, water flows through the overflow baffle reaction cell, the reaction cell, and add sodium hypochlorite, the heavy metal adsorbent and sulfuric acid to adjust the PH 2 (PH7-8), and then transported to the pump through the 2nd chemical sedimentation tank, add the coagulant chemical sedimentation tanks 2 the PAM, water flows through the overflow in the middle of the pool, the pool in the reaction of 1,2 the installed mixing pump and ORP, PH-line monitoring system, and ultimately the water through the overflow port spill over into the middle basin, the sludge settling down into the conical bottom pool into the filter press pressure dry. The middle of the pool water into the physical filtration adsorption treatment, followed by, respectively, into the quartz sand filters, activated carbon filters, heavy metals capture, removal of precipitation or difficult to get level degradation of small particles suspended solids, and then into the discharge monitoring pool discharge standards .
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