Key words: ferrite process, extend type of ferrite process,
The way, treating waste liquid in laboratory, currently is almost the sending to treatment factory run by the local people after collecting classification. For a long time in collection and the various sources in production of the above liquid, the waste from laboratory displays not having large variation of component but also knowing hardly the true constitution. Thus, to achieve the objective of a proper treatment is not easy in truth
In this work, a ferrite process (denoted by FP) was used to develop a method that could completely treat the waste liquid of laboratory containing heavy metal in solutions. The waste liquid synthesized with ten common ions of heavy metal such as Cd, Cu, Pb, Cr, Zn, Ag, Hg, Ni, Sn and Mn for each concentration of 0.002 M, and total concentration of heavy metal mixed in solution was 0.02 M. The performance of treatment in FP was judging by that the concentration of all heavy metals in filtered solution and the heavy metal containing in sediment sludge should be both below the regulations of effluent standards and TCLP standards.
It was found that the conventional FP could not meet the goal of performance. As a result, we develop the type of extend reaction of FP to improve the performance of conventional FP. The base of theory was to maintain enough concentration of ferrous ion for beneficial reaction going continuously. We found that extend type FP accurately did improve the sludge quality to meet the TCLP standards and the plus-adding was better than the continuous-adding in two kinds of dosage input into reactor, but it would raise the operation cost for overextended reaction. Thus, we designed a wash-cleaning method to decrease the cost and to confirm a further quality of sludge in extend FP.
Base on the achievements of this study, combining the commercial technology of ion exchange, we recommended a complete flow-chart to the user or plant owner to design the treatment plant.