Nature protection technologies

3.2.5. Ash and slag disposal sites

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.5. Ash and slag disposal sites

Ash and slag disposal sites are intended for long storage (disposing) of a part of ash and slag unclaimed by consumers. Ashes and slags are disposed in the form of slurries at constructed surface ash and slag lagoons or dry ash and slag landfills. Mines and open cast mines can be also used as ash disposal sites. Here only surface ash and slag disposal sites are considered. Ash and slag lagoons are complicated hydraulic engineering constructions.

3.2.5.1. Ash and slag lagoons

Putilov V.Y., MPEI(TU); Vishnya B.L., UralORGRES

Ash and slag lagoons (inwash ash disposal sites) are characterized by high breakdown rates as in Russia (according to investigations conducted by the firm “ORGRES” in 1970-1980-ties up to 70 % of ash and slag lagoons were in the emergency condition), and in other countries.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.5. Ash and slag disposal sites

3.2.5.2. Disposal of high-calcium ash as highly concentrated slurry

Putilov V.Y., MPEI(TU); Vishnya B.L., UralORGRES

In 2000 at Abakan CHPP under the project of “UralVNIPIenergoprom” Institute and “UralORGRES” enterprise with participation of SibVNIIG, the first section of a new disposal site was put into operation. A watertight screen of the disposal site was made of the self-hardening water-ash mix. At construction of the watertight screen high-calcium ash from hoppers near the main building was loaded in concrete mixers and mixed with water to the water-to-ash ration of 0,5 … 0,8

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.5. Ash and slag disposal sites

3.2.5.3. Dry ash landfills

Putilov V.Y., MPEI(TU); Vishnya B.L., UralORGRES

Significant reduction of lands intended for ash and slag disposal sites (ASDS) in a zone of TPP location; decrease in water consumption at TPP and harmful impact of ash and slag disposal sites on environment, and also cutting of power generation costs connected with ash and slag handling problem, are only possible in case of transfer from wet conveying method with disposing of ash and slag as low-concentration slurry to dry technologies of removal and landfilling which also create objective preconditions for processing of more ash and slag in a commodity output, used in various branches of economy.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.5. Ash and slag disposal sites

3.2.5.4. The results of biological recultivation of the second worked off section of ash disposal area of Novocherkasskaya SDPP

V.V. Biryukov, V.G. Lukyanov, Y.А. Lysenko, Novocherkasskaya SDPP - a branch of the JSC "WGC-6", Russia

I.V. Gurina, N.А. Ivanova - Novocherkassk State Meliorative AcademyRussia

 The results of biological recultivation for the second worked off section of ash disposal area of Novocherkasskaya SDPP are given. Agrotechnical survey of ash disposal area estimated that its natural overgrowing was lacking and a biological stage of recultivation for forming anthropotolerant phytosenosis is necessary. To determine the most adapted species of plants suitable for forming stable phytocenosis on ash disposal area laboratory experiments in vegetative vessels were carried out. These experiments made it possible to determine the possibility of growing grass mixture of coach grass + awnless brome + Hungarian sainfoin on ash disposal area and to substantiate scientifically seeding rates for grasses, rates of fertilizer usage and sowing terms as well.

Part 3. ASH AND SLAG HANDLING

3.2. Ash and slag handling systems at TPPs

3.2.5. Ash and slag disposal sites

Conclusions to § 3.2.5

  1. At development of designs on building the new and reconstruction of the operating TPPs, it is necessary to dispose the unclaimed part of ash and slag at dry ash landfills.
  2. Technologies of ash and slag landfilling shouldn't lead to degradation of their consumer properties.
  3. There should be minimum environmental impact of ash and slag landfills.
  4. It’s possible to use ash and slag for restoration of open-cast mines and land planning for the purpose of ravine backfilling and inarable land restoration, under condition of monitoring the quality of underground and surface waters in places of their arrangement.