Abstract
Waste generated during regeneration of Ion Exchanger (IX), used for deionizing water, needs to be neutralized before it can be discharged back to a clean water source. An efficient and novel process is disclosed that minimizes the neutralization volume and chemicals required for pH adjustment. The currently employed neutralization setups in the industry are environmentally unsustainable. Various neutralization setups were studied for treating waste generated from IX regeneration. From the collected plant data, the treatment requirements of waste streams generated during regeneration of IX beds were analyzed. An efficient neutralization setup was developed to lower the operating and capital costs by eliminating the need of some equipment and by lowering the neutralization volume. The new process results in considerable savings compared to currently used processes in the industry and is environmentally benign. The improved neutralization setup proposed in this work has achieved a 63% reduction in volume of IX regeneration waste stream; a 62% reduction in the capital cost; 23% reduction in chemical usage; and a 55% reduction in operating cost. The achieved improvements are quite significant, which are bound to immensely benefit the chemical industries that require demineralized water for their operation.
Highlights
Demineralized water is required in almost all chemical manufacturing facilities either to produce steam or for process operations
This paper reports a novel approach that was developed for improving the economic efficiency and environmental friendliness of the regeneration process via IX beds
Since the volume of the pit is smaller than the volume of the IX regeneration effluent the neutralization setup had to be halted to process the effluent streams
Summary
Demineralized water is required in almost all chemical manufacturing facilities either to produce steam or for process operations. If the water used in the boilers is not demineralized, it can cause scaling and eventually damage boiler tubes [1,2]. Demineralization process uses ion-exchange (IX) technology which primarily removes dissolved mineral solids [3]. IX resin comprise of ionic functional groups, like Na+ and Cl− supported on organic polymeric beads [4,5,6]. These functional groups have an affinity for ions of opposite charge in the liquid stream. IX reaction involves replacement of contaminant ions from the stream with either H+ or OH−
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