PROJECTION OF SOLID DOMESTIC WASTE POLYGONS IN MOUNTAINOUS RELIEF CONDITIONS

Lifshitz A.B, Zaytzev S.E, Prigov S.I, Closed Joint-Stock Company “FIRMA GEOPOLIS”, Moscow, Russia

The new solid domestic waste sanitary polygon is projected in Sochi for the purpose of its construction within the mountainous relief area of Lazarevsky district.

The polygon project that has been developed under the order of OJSC “Sochi MPK” by Closed Joint-Stock Company “Firma Geopolis” is targeted to disposal of the briquetted solid domestic waste. The project key objectives are as follows:

·                   To increase facility capacitance;

·                   To abate filtrate contamination;

·                   To shift the basic gassing phase to postoperational stage;

·                   To improve the polygon sanitary and ecological conditions within the period of its operation;

·                   To reduce wind-induced spread of solid waste light fractions;

·                   To minimize landfill negative ecological effect.

The polygon key specifications

The landfill area is of 10.5 ha. The estimated average daily supply of “refuse” shall make up 338.4 t. The waste shall be buried at the daily-constructed benches. The polygon natural surface slope has a grade of 0.13. The solid waste briquettes shall be stacked in their horizontal layers at the bench slope to be preliminary earthed from bottom to top.

With the bench being constructed, the slope shall be cut in 6 m of its height for the purpose of bedding of subhorizontal ground with a width of 40-60 m. At the foot of the hill the ground shall be restricted by the earth dam of maximum 2 m height with the external slope grade specified in ratio 1:3 and the internal one – 1:1 or steeper. Each three solid waste layers with a height of 2 m shall be stacked within the cut area. Every layer shall be placed only after the new dam is constructed, thus providing a kind of enclosure to be used for keeping of briquettes. With the above enclosure being filled the waste surface shall be coated with a layer of maximum 3 m ground. The following level shall stacked uphill by the similar method.

All the dams shall be made of the clay soil delivered from outside or taken locally. The cutaway soil-vegetable stratum shall be saved for polygon revegetation.

Operation life, the polygon shall projected for, is specified to be 10 years. At its final condition, the landfill stock shall have a shape of mound with the top horizontal ground leveled at 145 m to have a mass of 1.23 million tons.

The polygon engineering facility shall consist of:

·  Access road;

·  Waste-stocking area roads;

·  Polygon-surrounded hillside ditch;

·  Fence;

·  Lighting;

·  Storm sewage system with local disposal facilities;

·  SDW storage platform engineering system including impervious screen and filtrate evacuation system;

·  Waste stock degassing system;

·  Local disposal facilities for decontamination of filtrate.

The complex of the above engineering systems specified by the project shall prevent any negative effects to be considered as an ordinary phenomenon for waste disposal zones and give the polygon the status of the new generation process facility.

The engineering-and-economical performance specifications are given in the below

Table.

In mountainous relief conditions that are quite complicated for projection and construction activity, some potential for building of the up-to-date and ecological solid domestic waste polygons is available. In the event of this, as compared to the flat polygons, the ones operated within the mountainous area shall be of quite a complex nature. The mountainous ones differ by relatively low specific capacity (rate of solid waste load per area unit). Nevertheless, the engineering-and-economical performance specifications of the both polygon types are almost similar.