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Waste Management Paper No. 24. Cadmium-Bearing Wastes

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Codes of practice for dealing with Cd wastes and applications are discussed. Tables illustrate issues and legislation. Occurrence of Cd in environment and industry are outlined. Nature of wastes as Cd or Cd compounds from industrial processes with effects and methods of detection are described. Recovery methods are stressed. Treatment and disposal into sewage and aquatic systems, marine environment and by landfill are assessed.

Waste Management Programme for Electroplaters

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Management strategy for effluent & waste solids disposal, lists options and possible consequences.

Waste Management Regulations, Treatment, Recovery

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A "feature" on regulations, management and some examples of technology applied to effluents from metal finishing. Q & A panel on trouble-shooting & problems.

Waste management tests of painting materials from spray painting at water cycle cabin

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Waste composition of several industrial water wash cabins has been investigated. Results have shown that total mass fraction of heavy metals in water wastes varies from 0.2% to 15%. Typical components are: Pb, Zn, Si and Fe. Following methods of waste management have been proposed: (1) waste disposal on dump from where reflux will be sent to sewage-treatment plant and then to municipal sewage system or to surface receivers, (2) waste combustions, washing out of water-soluble component from waste after combustion and typical water treatment (wastes removal to dump).

Waste materials and emission in paint technology

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Sources of wastes and emissions from pretreatment and finishing processes are categorised.

Waste metal extraction apparatus

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Apparatus includes cell with offset semi-cylindrical baffles on sidewalls for guiding waste stream through tank in serpentine manner bottom sloping downwards at angle > 6° to facilitate removal of solid particulate from waste stream.

Waste Minimisation

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Report of a debate on means to minimise effluents by recycling or recovery.

Waste Minimisation & Cleaner Technology in the UK Surface Finishing Industry

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A review of waste management schemes in finishing companies, mainly in Holland & UK, with several case-studies in which costs before and after changes in waste management strategy are given. 4 refs. (Paper appeared in Bulletin section of November issue).

Waste Minimisation & Pollution Prevention at Pratt & Whitney Aircraft

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Case study focussed on Ni plating line for which flow lines & floor layouts are shown. Graphs show Ni conc'n in rinse tanks as function of workload etc, and the use of ion exchange to recycle water. Conductivity meas'ts are plotted to indicate concentrations.

Waste Minimisation & Solution Purification Using In-Tank Filtration

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Greater elegance of title process is extolled & case studies show costs savings through, e.g reduced spillages.

Waste minimisation - route to improved profitability

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Sermon preaches better working practices both for increased profitability & compliance with environmental legislation. Suggests UK now has only 600 contract jobbing platers. Discussion of rinsing practice incl. single & cascade types, with sample calculations, also spray rinsing, with comments on process economics & costs, incl. use of ion exchange for recirculation. Comment on recirculation for hydrochloric acid pickling. Investment data for conventional & closed loop chromium plating line. Discussion of economics of evaporation. 3 refs

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

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GB199906142 SIGLE DSC

Waste Minimisation I. Introduction Alternate Recovery Technologies

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Introductory comment on effluent treatment - recovery vs. treatment.

Waste Minimisation II Concentrate Return Methods

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Means of conc'n of rinsewater are reviewed, so that they can be returned to the plating tank. Process flow sheets and disc'n of individual conc'n methods.

Waste Minimisation in Stainless Steel Pickling Solutions - Study of Chromium Depleted Surface

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Study sets out to model dissolution kinetics of Cr depleted surface. 20 different test solutions were used & weight loss is plotted vs. time for some of these. Effect of Cr on dissolution rate is graphed. Regression analysis is used to give pseudo-reaction order in free fluoride & free acid. Comments on mechanism suggest involvement of another species, perhaps nitrous acid. Activation energies are slightly lower than prev. reported values. 17 refs.