The results obtained from first three cycles of experiments shows considerable variation between visual and weighing experiments. Consistency was achieved in the fourth cycle experiment which coincided with the new academic year. Fourth cycle experiment results are listed in the Table 2.

Analysis of results shows that zones 1,2 and 3 which include academic, administrative and hostel buildings contribute considerable quantity of recyclable materials like paper, paper envelops, and plastics (polyethylene 90%) which have good market value, if they are properly segregated from the waste stream. Separate dustbins can be provided to sort out recyclable material at source itself in these zones, thereby source reduction and also recycling can be accomplished.

Considering the zone 2 and 7, which include residential, hostel and messes where fermentable matter quantity (80% of total waste) is quiet high, which can be reused to produce compost and biogas. Since those zones composes of residential quarters, hostels and mess, the door to door collection would be effective to segregate organic wastes. Door to door segregated wastes collection, which is already in practice in a part of the residential area, could be extended to other parts. ASTRA's biomass plug -flow fermenter technology (biogas plant) would be a viable alternative to utilize the available domestic waste and biomass. This system can handle 800kg of garbage per day, and has the payback period of 3 years and produces the enriched fertilizer after digestion (Dr.P.Rajbapaiah, 1995). Biogas generated could be supplied to low income households (such as helpers, who use fuelwood and kerosene). Litter monitored in 1m*1m randomly selected study plots, The average value is computed for each study plot which is extrapolated to entire IISc campus based on tree and species density. For this extrapolation tree density per hectare was computed and from the primary data of study plot, litter generated and number of trees in the study plot litter quantity per tree density was computed. The litter quantity was done for one-hectare study plot. Results are shown in Table 3. The leaf litter quantification was also done taking into account removal moisture content and woody branches.

Current practice of collection, vehicle collects wastes generated in the campus at a frequency varying from 1 to 3 days. It is necessary to arrive at better collection strategies for better utilization of waste materials generated at IISc campus. In this regard a transfer station is proposed to handle the waste collected from the other zones before final disposal. This station enhances further separation of bioresource and recycling products and reduces the volume of waste goes to final disposal.

Regarding the hazardous waste (which including biological waste, hazardous chemicals and radioactive wastes) handling, the present practice for disposal is quiet satisfactory (personal discussion with Dr.Kondaiah) according to BARC specifications. But in future, when the waste dumping yard gets filled, it is necessary to produce containers placed below ground level. Biological wastes arises from labs, healthcentre are in the form of cotton, broken glass utensils, contaminated clothes etc. care is given to these wastes and they are mixed with general waste stream. In order to avoid that specially designed dustbins should be placed in the sources to make aware of the public. As per KPCB (Karnataka Pollution Control Board) norms appropriate size of incinerator has to be designed to handle these wastes.

As per present practice, which prevails in developed and developing countries for final disposal facilities such as incineration, sanitary landfill, gasification etc. have their own disadvantages and advantages and if final disposal rely on one disposal method, it won't be effective. Though different disposal techniques are available it is unfortunate that nowhere in India, the fully engineered disposal of solidwastes is implemented due to lack of strict laws. The current practice of waste disposal is non-engineered one (Masoor Ali, 1999) and campus waste is mixed with Bangalore City solid wastes, dumped (open dumping on ground) in corporation disposal site. The proposed (EPA,1989) integrated approach (i.e., combination of aspects like source reduction, recycling, incineration and landfilling) allows only inert materials to final disposal, which cause almost no environmental degradation.