Saturday, 15 July 2006
170-18

Land Disposal of Urban Industrial Solid Waste of Wazirpur, Delhi: Effect of pH on Plant Available Sulfur.

Gurmeet Singh and Asim Kumar Bhattacharyya. Jawaharlal Nehru Univ, School of Environmental Sciences, New Dehli, India

Delhi, the capital of India has emerged as a major industrial city. As a result nearly 59,423 tons of solid waste is generated from this sector per year as per MoEF, 2000. Wazirpur Industrial area is one of the major contributors towards the problem of waste disposal. The waste generated is highly acidic (pH 2.3-3.8) in nature. Since sulfuric acid is used for cleaning of metal and metal related products, sulfur constitutes an important fraction of the waste. For the land disposal of these industrial wastes (collected seasonally i.e. Summer, Winter and Monsoon), a laboratory incubation study was undertaken. The wastes were treated with three doses of lime and then they were mixed with two different types of soil in different proportion. 50% moisture content of the water holding capacity of the amended soil was maintained and the samples were incubated at 28° C for 120 days. pH increased with addition of waste and decrease with lime treatment. However, with days of incubation pH tend to return towards neutral. Available sulfur showed release over the treatment of lime as well as with the percentage of waste and it showed increasing trends followed by stabilization on incubation. The correlation between the pH, and the available sulfate of the soil waste system during the incubation period was also studied.

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