Lanlang ® CH020 is a sort of chelating resin which has weakly acidic iminodiacetic acid [-CH2N-(CH2OOH)2] in the styrene / DVB copolymer with special macroporous structure. This product can fix and chelating one or several kinds certain cation in a great range even in the solution with high content. CH020 is also used to remove cooper, nickel, cobalt, zinc from waste water.
Wastewater from several industries such as electroplating, tannery, mining and steel contains elevated levels of heavy metals including chromium, cobalt, copper, nickel, zinc, mercury and lead. If the wastewaters were discharged directly into natural waters, it will constitute a great risk for the aquatic ecosystem, while the direct discharge into the sewerage system may negatively affect the subsequent biological wastewater treatment. Additionally, increasing environmental awareness coupled with more stringent regulations has triggered various industries to challenge themselves in seeking appropriate wastewater treatment technologies. Thus these toxic metals must be effectively treated/removed from the wastewaters.
Ion exchange (IX) can attract soluble ions from the liquid phase to the solid phase, which is the most widely used method in water treatment industry. As a cost-effective method, ion exchange process normally involves low-cost materials and convenient operations, and it has been proved to be very effective for removing heavy metals from aqueous solutions, particular for treating water with low concentration of heavy metals.
Ion exchange transfers one or more ionic species from one liquid phase to another via intermediate solid resins. To achieve this, a group of ion species (the target ions) present in a solution is exchanged with another group of ion species belonging to a solid phase (IX resin or IXR). The target ions which may be toxic, precious, orcontaminants affecting water purity are therefore concentrated on the resin, while non-toxic, precious or contaminating ions are released from the resin to replace them in the solution. Furthermore, the ion exchange process is typically intended to be a reversible one. Thus, the spent resins are expected to be regenerated and reused. The use of a regenerant on the IXR could, subsequently release the target ions into solution again and allow recovery of the IXR’s exchange capacity so that it may be applied again on more of the original solution.