Garbage disposal at Mangalore
Posted: Sunday, November 23rd, 2008 | Posted by: Ashish Rao | Views: 23273
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Every morning when you wake up there are certain activities which happen quite naturally. Your milk and Newspaper are delivered to your doorstep. Also making its presence felt are the garbage collectors who meticulously collect the waste. If you thought this was happening without any plan then think again
The Mangalore City Corporation has developed a management system for solid waste to make sure the city is pollution free. Collecting garbage from each doorstep is just the beginning . The entire system has a stage by stage process by which garbage is reduced to bio degradable material. Unless this is done garbage can be an environmental hazard. When you throw your garbage into the bin it is the first step in a process called segregation.

 Idealy all domestic waste must be separated into Bio Degradable and Non Bio Degradable material. But unfortunately this has not been followed by our citizens. If this separation takes place at the source then it becomes easy for collectors to discard garbage. The Environmental Engineer for MCC, Madhu says, ' We have tried everything from our side like distributing pamphlets to educate the public about segregation but nobody follows it'. If  the public cooperate in this regard then the process of garbage disposal becomes even more environment friendly. Segregation helps in identifying the hazardous waste from non hazardous waste. The process of collecting waste from your doorstep is called primary collection. This is the second step in solid waste management. Mangalore private contractors take charge of this process. Some NGOs like Nairmalya Samithi and Resident's Welfare Associations (RWA) have taken the initiative in doing the needful. They own their own collection vehicles and send boys for door to door garbage collection. The contractors usually charge Rs 20 from each residence. Push carts and Tricycles are used for this purpose.

 The next,  step in waste disposal is called secondary storage. It is essentially a system of storing garbage in the right manner in the city in different containers. The MCC has 60 three meter cube containers, 60 open 4.5 meter cube containers, 750 RCC bins. These are placed at strategic locations near housing areas where it is easily accessible by residents. Presently there are more number of 4.5 m cube containers. In a particular ward 20 RCC bins are reduced to 2-3 containers. But even with these arrangements most residents tend to throw waste outside the containers and thus the Corporation has decided to have just one 4.5 m cube containers for each ward.

 For the garbage to move on to the next level secondary transportation is necessary. For this the MCC has 8 twin container dumpers, 3 single container dumpers and 2 tippers. These vehicles are used to remove garbage from the containers. Most of these contracts are outsourced. Tenders called now are for a period of five to seven years. To make this possible 226 powra karmikas are employed. Around 130 temporary workers also support the task. Those who win the contracts also collect garbage from house to house. Until now a total of three bids have been approved for the next year.

If garbage is to completely decompost , a system of processing and treatement has to be  administered. For this a land of 77.93 acres is allotted at Vamanjoor. A 160X48 m concrete platform is made for this. The purpose of this is to vermicompost the garbage. Heaps of garbage are lined up in long rows. These are called wind rows. On these heaps bio slurry or cowdung slurry is sprayed. But the biggest challenge faced by garbage disposal team is the amount of plastic which is collected. Unless people stop using plastic garbage recycling is difficult. The wind rows are 5X3 m in dimension. Once the garbage is arranged in wind rows it goes through screening. There are 3 screens and garbage will have to move through conveyor belts. In between there are 2 bucket elevators. One of the screen is 4mm in width and through this two grades of compost namely grade A and grade B are used. Rejects from these screens will be land filled. For the land fill 68 pits are made. The vermicompost is 0.6X0.6X15 m in dimension.Garbage collected from the second wind row is put in to vermicompost.

 The last stage in garbage disposal is the sanitary landfill. After every week the rejects have to be put  into a land fill which is of valley type. There are many layers to the land fill. First is the clay liner of 0.9m.That is covered by 15mm of high density poly ethylene (HDPE). Above that is sand , drainage layer and gravel.The HDPE s jet into the leacheate pond. This pond contains water from waste land. A second pond called anaerobic pond .Presently at the Vamanjoor dump yard rejects are still not put into the composte plant. The wind row  process takes 2 months and screening would take a month. This process had begun in August. Thus for the proper land fill to happen workers will have to wait for wind row to complete. In Mangalore the entire garbage disposal system stops after the first two stages. It is from here onwards that the process becomes slow. Inspite of the health officers showing Educational programs the society does not care for segregation of garbage. The MCC is still holding meetings and is doing its best.

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