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Reclamation of industrial waste and derelict land
Başlık:
Reclamation of industrial waste and derelict land
Yazar:
Pulford, Ian Douglas, author.
ISBN:
9780438052628
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (197 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: H. J. Duncan.
Özet:
This thesis deals with some of the problems which are encountered when industrial waste and derelict land is reclaimed and revegetated. Attention has been focussed on the chemical problems found on coal-waste tips in Central Scotland. A review has been made of the amount of dereliction found both in Scotland and in England and Wales. Previous approaches to derelict land reclamation have been discussed, and some initial observations made upon them. These relate to practical considerations such as suita.ble species for planting, seeding rates, fertilizer applications, etc.. Considerable attention has been paid to the influence of the oxidation of iron pyrites (pyrite) on the properties of coal-mine waste as a plant growth medium. This oxidation forms a number of products which are detrimental to plant growth; acid, high salts, high extractable metals and amorphous iron oxides. Similar problems are found in other situations, such as polder soils, mangrove soils and acid sulphate soils. Evidence of pyrite oxidation in Scottish pit bings (coal waste tips) has come from pH and sulphate levels, iron movement, phosphate fixation and trace metal levels. In order to develop methods for measuring the potential acidity and for inhibiting the oxidation, studies were made on the oxidation pathway. The importance of the ferrous to ferric iron oxidation has been shown. A method for predicting the potential acidity of coal-waste by measuring pH and extractable sulphate has been proposed. This has proved to be of use in Central Scotland, but there are limitations to the method which are discussed in Chapter V. Possible inhibiting agents to reduce or stop pyrite oxidation have been suggested. These were chosen for their ability to interfere with the ferrous - ferric oxidation; for example phosphate, E.D.T.A. and ferricyanide all proved successful. The adsorption of phosphate fertilizer by coal waste is a problem which could increase the cost of a reclamation programme. Studies were made on the behaviour of phosphorus in the bing me.terial. Levels of available phosphorus were shown to be generally low, apart from a small number of samples. The ability of the coal waste to adsorb phosphate was variable; correlation with other properties showed that amorphous iron oxides were solely responsible for phosphate adsorption in Scottish coal mine waste. These iron oxides are products of pyrite oxidation. Burning of the coal waste, which can occur spontaneously in a tip, has been shown to have a. considerable influence on its adsorptive properties. Both phosphate adsorption and amorphous iron oxide levels increased with heating up to approximately 450°C. Of the nutrient elements required by plants, nitrogen and phosphorus appear to be usually deficient in coal mine waste. Potassium is generally present in sufficient amounts for plant growth, although pH and combustion have an influence on its availability. Of the other elements measured, extractable calcium and iron levels appear to be closely related to pH, although differences in the availability of many nutrients were found between red (burnt) and black (unbumt) shale. An assessment of the work has been presented in Chapter V, where some implications of the results have been discussed and projections made of its future development.
Notlar:
School code: 0547
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684408.1) | 684408-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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