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1972 results. per page « 3 4 5 6 7 8 9 10 11 12 13 »

Waste Cyanide Control Processes

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Means for recycling CN or destroying it as per keywords are summarised. 1 ref.

Waste descaling solution

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55,061,996. Waste soln. produced in descaling boilers and heat-exchangers containing HCl and H3PO4, is treated by adding Ca compound and alkali to opt. Fe and phosphates as Ca phosphate and Fe(OH)2, air is introduced to oxidise Fe(II) to Fe(III) and persulphate is added to oxidise COD. 55,061,997. Soln. containing citric acid and phosphate is treated with Ca(OH)2 or CaO to alkaline pH to ppt heavy metals, citric acid and phosphate as heavy metal hydroxide, Ca citrate and Ca phosphate, settling and adding persulphate to supernatant liquid to oxidise COD.

Waste Disposal for Metal Finishing Industries

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Overview of common effluent treatment procedures. No data, no refs.

Waste Disposal from Metal Finishing Plants - Integrated Solutions for Avoidance & Minimisation

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German legislation is set out & its consequences explained. Factors affecting drag-out losses are tabulated. Various technologies for recovery of chromium & nickel are compared (electrolysis, ion exchange. Costs are shown for various Ni recovery schemes. CP method in which sludges are incorporated by firing into ceramic tiles, is shown.

Waste disposal of coated metals

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Metal articles with surface coating is reduced in mill to particles of 1-20 mm, then to 0.1-2.0 mm, diam, spherical particles, and non-metallic substances separated from metallic, non-metallic fraction is agglomerated and metallic is recycled.

Waste disposal, energy production, material recycling

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Review.

Waste economy in Switzerland - a political matter

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Waste exchange

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In discussion on waste exchange, i.e. finding user for waste products, example is given of company recovering solvent from xylene-based waste obtained from cleaning machinery.

Waste exchange

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Describes passive waste exchanges which publish information and active exchanges in which waste is sold through 3rd party.

Waste exchange: financial gains to be made

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Activities and benefits to industry of waste exchange set up by W. Midlands County Council are discussed and list provided of waste disposal lauthorities in UK counties.

Waste from Steel Blasting & Cleaning

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Studies on waste produced when steel is blast cleaned & problems of its disposal in terms of legislation. Data includes amount of pigment incorporated in this. 5 refs.

Waste gas denitrification experiments and some cases of application

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Waste heat recovery system and its application to automotive paint lines.

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The feasibility of recovering waste heat of exhaust gas from painting was analyzed and its application in automotive production line was introduced. The process of a specific case was described. Some points for attention were described. The effectiveness and promotion significance of waste heat recovery were proved.

Waste incineration is relevant to Metal Finishers too

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Note on improvement in performance of municipal incinerators (table lists emission conc'ns by type and by year) and that costs will decrease. Use statistics (tonnages, tons per person) in Germany are listed and scope for handling waste from plating companies is discussed.

Waste Management Paper No. 23. Special Wastes: a Technical Memorandum Providing Guidance on their Definition

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Describes how to establish whether waste is special waste under Control of Pollution (Special Waste) Regulations 1980 (Statutory Instrument No. 1709, 1980). Shows how to use toxicity data, to assess whether material is dangerous to life, and how to establish status of homogeneous and heterogeneous mixed wastes. In last-named case, presence of small amount of toxic component as discrete entity in larger amount of less toxic waste is considered to render whole consignment special waste. 31 main chapters deal with various groups of materials, e.g. Cd, Cr(III), Pb, Hg and Zn compounds, organic halogen compounds, peroxides,etc., and describe uses, toxicity, and wastes arising. Worked examples show how to calculate whether particular wastes are special wastes.