Dis­man­tling of Mount Garbage be­gins

Ma­chines All Ready To Flat­ten Three City Land­fills; Waste To Be Seg­re­gated Into WTE Fuel And Re­cy­clables

The Times of India (New Delhi edition) - - Times City - Vibha Sharma & Jas­jeev Gand­hiok

New Delhi: The count­down for pro­cess­ing the 28 mil­lion tonnes of waste ac­cu­mu­lated at the overused Bhal­swa, Ghazipur and Okhla land­fills has fi­nally be­gun af­ter three decades. This week, the three mu­nic­i­pal cor­po­ra­tions ini­ti­ated work to bio-mine the trash and lower the heights of the garbage mounds.

East Delhi Mu­nic­i­pal Cor­po­ra­tion took the lead and put up a trom­mel-cum­bal­lis­tic ma­chine ear­lier this week. It is ca­pa­ble of seg­re­gat­ing 640 tonnes of waste daily. The other cor­po­ra­tions too have started work on their projects. “We will take 2-3 days to fin­ish in­stalling the ma­chine. We have flat­tened some sites at the Ghazipur land­fill to put them up,” an EDMC of­fi­cial said. “Stor­ing the seg­re­gated in­ert ma­te­rial will, how­ever, prove a chal­lenge.”

The ma­chines are ba­si­cally gi­gan­tic cylin­dri­cal sieves that sort the waste into de­tri­tus of dif­fer­ent sizes and types for suit­able treat­ment. The EDMC of­fi­cial ex­plained, “To be­gin with, the bal­lis­tic sep­a­ra­tors di­vide the en­tire trash into three seg­ments: ma­te­rial for refuse-de­rived fuel (RDF); con­struc­tion and de­mo­li­tion (C&D) waste big­ger than 40mm in size; and ma­te­rial smaller than 40mm. The last will be fed into the trom­mel which will then sep­a­rate the ma­te­rial into in­ert waste big­ger than 6mm in size and soil par­ti­cles smaller than that."

When TOI vis­ited Ghazipur on Fri­day, it no­ticed work un­der way to in­stall two ad­di­tional trom­mels, each ca­pa­ble of con­sum­ing 300 tonnes of waste daily. In a month, EDMC hopes to seg­re­gate and process over 20,000 met­ric tonnes of the 14 mil­lion met­ric tonnes at the land­fill.

At Bhal­swa, North Delhi Mu­nic­i­pal Cor­po­ra­tion of­fi­cials as­sured that nine trom­mel ma­chines were be­ing in­stalled, with four of these likely to be func­tional in the next two days. TOI ob­served on Fri­day how con­crete slabs had been in­stalled to sup­port the weight of the ma­chines. “The area where the ma­chines stand was marshy, un­even and full of garbage. We cleared it and put the con­crete slabs there,” an of­fi­cial over­see­ing the work said.

The of­fi­cial added they would start with nine ma­chines and add more as work pro­gressed. Each trom­mel

Le­gacy waste at

ma­chine will process 300 tonnes of waste daily. But the of­fi­cial also pointed out, “The ma­chines will to­gether han­dle 2,700 tonnes daily, but, frus­trat­ingly, 2,000 tonnes of new waste reach Bhal­swa land­fill ev­ery day. This means that we will even­tu­ally need more ma­chines.”

Un­like EDMC, the north cor­po­ra­tion has found a fiveacre space at the land­fill to store the in­ert ma­te­rial. Long-term op­tions are be­ing con­sid­ered too. The of­fi­cial ex­plained that RDF would be con­sumed by the waste-toen­ergy plant there and also by the ce­ment in­dus­try. C&D waste will be pro­cessed at the plant in Shas­tri Park for cre­at­ing tiles and other prod­ucts.

At Okhla, South Delhi Mu­nic­i­pal Cor­po­ra­tion will start op­er­at­ing one trom­mel ma­chine from Satur­day. It will seg­re­gate ma­te­rial like brick and tiles from plas­tic bags, lighter items and mixed trash smaller than 30 mm in size. When space can be cre­ated, SDMC plans to in­stall more ma­chines.

The SDMC of­fi­cial said that the trom­mel screen would seg­re­gate ma­te­rial sized 30mm or above, while a blower would sep­a­rate ma­te­rial that could be­come RDF for wasteto-en­ergy plants. How­ever, an EDMC of­fi­cial ar­gued that with­out a bal­lis­tic ma­chine, seg­re­gated ma­te­rial less than 30 mm in size would be of no use. “We need to in­stall a screen ca­pa­ble of sort­ing soil par­ti­cles 6mm in size,” he said.

Dr Asad Warsi, a con­sul­tant ex­pert who was ear­lier in­volved in the dis­man­tling of the land­fill at In­dore, said that of the 9-10 trom­mels at the three land­fills, eight would have screens with a bore size of 30mm. The rest would have 8mm screens. “The con­veyer belts have been de­lib­er­ately kept long to al­low man­ual pro­cess­ing of the C&D waste,” Warsi ex­plained. “Plas­tic waste and rags will be sep­a­rated by the trom­mel while metal scraps will ac­cu­mu­late in a sep­a­rate metal trap.” Fine soil will emerge at the end of the trom­mel and it can be used or taken else­where.

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