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Waste Minimisation IV Recovery/Regeneration of Process Baths

Relevancy:  

The recovery/regeneration of process baths from pickling, etching, bright dipping or chemical milling, as well as etching of plastic, treatment of copper, aluminium & iron & steel, alkaline cleaners, phosphating & chromating baths are discussed.

Waste Minimisation Part III Non-Return Recovery Methods

Relevancy:  

Review of non-return effluent treatment methods includes electrolytic metal recovery, ion exchange and both together.

Waste Minimisation Through Process Optimisation

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Case study of Fisher Co who used SPC and product quality programmes to reduce their effluent emission by more than 50% and who plan further improvements until zero discharge is attained.

Waste Minimisation V - Recycle of Treated Rinsewaters

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Qualitative disc'n of keyword methods for recycling rinsewaters.

Waste Minimisation. A Checklist & Assessment Manual for the Metal Finishing Industry.

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GB9314561 SIGLE DSC

Waste Minimisation. Part 2.

Relevancy:  

Disc'n of spray rinsing and barrel rinsing procedures to minimise solution losses by dragout.

Waste minimisation. Pt. III. Non-return recovery methods

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Reviews electrolytic recovery and ion exchange recovery methods and sale of by-product sludges.

Waste minimization

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General review.

Waste minimization - Pt. III

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Discusses filter design, reduction of rinse water usage and barrel design.

Waste minimization and the bottom line

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Brief discussion of processes for waste treatment are discussed, incl. ultrafiltration, ion exchange and electrolytic recovery equipment.

Waste minimization in stainless steel pickling solutions: a study to model dissolution kinetics of the chromium-depleted surface

Relevancy:  

Dissolution rate of Cr-Ni-Fe alloys in nitric hydrofluoric acid mixts decreases as Fe content decreases with change in mechanism as Cr increases from 12 to 14 wt%. It is concluded that effects of Cr depletion must be considered in optimising chemistry of this pickling solutions. The critical role of free fluoride ion is highlighted and also that of another active species, perhaps nitrous acid. Activation energies are reported, these being slightly lower than literature values, perhaps due to lower Cr content of the alloy. (120.196881)

Waste minimization!

Relevancy:  

Viewpoints on waste reduction in finishing industry are presented.

Waste minimization. Pt. 1. Introduction. Alternative recovery technologies

Relevancy:  

Discusses advantages of recovery vs. effluent treatment.

Waste minimization. Pt. II. Concentrate return methods

Relevancy:  

Discusses roles of evaporation, reverse osmosis, electrodialysis and ion exchange in metal finishing waste treatment.

Waste minimization. Pt. IV. Recovery/regeneration of process baths Pt. V. Recycle of treated waste water

Relevancy:  

REcovery from pickling, bright dipping, etching and chemical milling solns. of Cu, Fe and steel, as well as from plastic etching, alkaline cleaning, phosphating and chromating solns. is discussed. Methods discussed include ion exchange, distillation, reverse osmosis and electrodialysis.