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Zero Discharge Spray Rinse System
Zero discharge zinc phosphating - evaporators ensure water & chemical recirculation.
Very detailed description of title process with colour diagram of "Prowadest" vacuum evaporator, detailed process flow sheet and step-by-step listing of stages, showing upstream recycling loops & photo of installation.
Zero discharge. More than just environmentally friendly
Describes use of vacuum evaporator in a California plating plant with 98%+ water recovery, $6000/mo cost savings and exemption from several legislative burdens. Abstr. only
Zero downtime retrofit of 15 crane decorative automotive plater
Case study where new computers, software and I/O hardware was fitted, checked and then activated without loss of production time. Abstr. only
Zero effluent discharge
Title term so defined that both process baths & rinsewater are recycled, which requires that individual rinsewater streams are kept separate. Some sludges may still have to be disposed of.
Zero emission chlorinated hydrocarbon cleaning
Case study of cleaning & degreasing plant using chlorinated solvents, but with an intermediate chamber so that no emissions to atmosphere take place in loading or unloading of work.
Zero emission electrochemical flow reactor for electrodeposition of multilayer nano-structures
Nickel-copper multilayers, as used for GMR (giant magnetoresistance) are one product of title system, for which flowsheet is shown. Discussion of dual bath method (Cu & Ni sol'ns between which work is transferred) & single bath (mixed Cu & Ni ions, with pulse plating). Authors report novel approach, where electrodep'n occurs in inert atmosphere, with sol'ns alternately pumped in and out, rinsing in between. Extensive report of recovery of metal ions from sol'n, incl. design details of cell with low-cost RVC (reticulated vitreous carbon) cathode. Graphs show cathode efficiency of Cu & Ni recovery, stirred & unstirred, and as function of pH, c.d, flowrate etc. Deposit is characterised with SEM & XRD data. 21 refs
Zero HAP's Waterborne Formulation for Paint Line Purging & Paint Stripping
Notes new HAP-free. low VOC surfactant based products and their uses. Schematic & discussion treat solvent recycling.
Zero liquid discharge for pollution control
Describes 'Zerpol' system of Zerpol Corp., Hatfield, PA, in which conventional chemical treatment is combined with dissolved salts recovery for treated rinse water for recirculation.
Zero liquid waste surface treatment
Zero waste surface treatment is considered and a flow diagram is shown illustrating the various treatment stages: rinsing water, ion exchange, central regeneration, storage of acid and basic eluates, storage of cyanide and hexavalent chromium eluates, decyanuration, dechromation, physicochemical treatment, filtration, etc. The different stages of effluent recycling are discussed, i.e. direct or diaphragm electrolysis, physicochemical treatment, evaporation, membrane filtration. It is considered that recycling should aim at water and reagent economy, decrease in sludge volume and treatment costs, respect for the environment, and conformity with water consumption laws. Possible microbiological growth should be monitored at all treatment stages.
Zero Pollution & Faster Electroplating with YRPS (Yamaha Rapid Plating System)
Note on title system using force flow agitation to offer plating rates of up to 30 microns/minute for chromium, copper nickel which operates in virtually a zero discharge mode.
Zero VOC coating technology - innovative solutions for old problems
This paper examines some of the traditional coatings used in the maintenance industry and their zero VOC alternatives.
Zero VOC waterborne polyurethane topcoats
Overview of paint systems used by US Navy aircraft incl. standard topcoats. The question of (environmentally) compliant coatings & zero emission VOC is addressed. The benefits of waterborne technology are extolled. Sketch shows ca 120nm max size resin micelle and functional groups associated with it. The zero-VOC topcoat is discussed. Removing compliance problems will simplify maintenance operations. 15 refs
Zero waste effluent desalination system
Zero waste technologies in the surface finishing industries
Some examples of zero discharge (waste & effluent) are noted. They include return of rinsewater in alkaline copper plating after reverse osmosis treatment, and re-use of chemicals in nickel plating bath after precipitation, salting-out etc. Organics are at the same time removed. Cleaning baths are subjected to ultrafiltration and other baths can be treated using a range of recognised methods.