Experimental Research Of Treatment Techniques In Disposing High Concentration Organic Chelae Compound Nickel Plating Waste Liquid And Rinse Water

The research is about the treatment of high concentrated organic chelate nickel plating liquid and the rinse water generated in the manufacturing line of XiariYang Rainbow Grop. We concertrated the experiment on the disposed and recircling of the waste water. The waste liquid is processed by decompression-evaporation and concentration crystallizing. Experimental data illustrate that boiling temperature lowed by decompressing the pressure of the waste liquid to negative pressure, for example, when the absolute pressure is 0.035Mpa, the boiling temperature is 73℃.This process increases the temperature head between heating water and boiling waste liquid, meanwhile decreases the surface of evaporator and heat loss. When the waste liquid is concentrated to a concentration that three times higher than the original liquid by the process of decompressing-evaporation, nickel content in the secondary vapor absorbent is 0.15mg/L at most; COD is 9.4 mg/L, which reach the recycling and discharging standard. The condensed waste liquid is disposed by evaporation-crystallizing process, which generates remains contained 5.3% nickel that can be recycled by the smeltery. Nickel plating rinse water is disposed by the process of ultrafiltation-reverse osmosis membrane separation technique. Filtered water is recycled. Concentrated rinse water disposed by decompression-evaporation and concentrating-crystallizing process together with the waste water. Experiment illustrates that used as pre-disposal technique in the process of RO, selecting membrane PES-10000 as ultrafiltation membrane is suitable; RO technique is efficient in nickel and COD removal The removal ration is 99.4% separately, in the incipient operation and 93.45%, 93.4% separately, when recovery coefficience of ultrafiltration is 55.75%.The coneertration of rinse water is below 1.8 times than the original rinse water when the filtered water is used as cleaning water(nickel coneertration is lower than 20 mg/L). Thetechnique of decompression-evaporation and concertration-crystallization in disposing high concentrated organic chelate nickel plating waste liquid and ultrafiltration- RO membrane separation in disposing rinse water which are put forward in this paper make it possible for comprehensive ultilization of waste water, i.e. recycling of heavy metal and rinse water. The technique is of great applied value. It is easy for operation. Except for vaper heat source, no additional chemical agent is needed, which will keep away from the secondary pollution.