Cement, Energy and Environment

, TAKY Slandard1 • EPAStandardl • Referans • 16% At* 't'akll FigS. Heavy metal concentrations leaching from cements with alternative waste fuels. such as Zn, Pb and Cr originating from waste oil and used tire could be held inside the cement structure and their emission into the environment could be prevented. Cr could be stabilized in matrices having high pH value (pH=11-12) as provided by cement. According to Zamaroni, Cr forms a "chromium gel" (Cr(OH)26H 2 0) and becomes stabilized in cement. It was possible that Zn was held inside the solid matrix as Zn hydrate or Zn hydroxide due to the high alkalinity of cement mortar or by forming calciummetallic Zn compounds. The stabilization of Pb is realized in two phases: first Pb hydroxide forms, later it takes parting C-S-H gel. A study by Thevenin and Pera indicated that Pb reacts with C in the C-S-H gel and produces the Pb-C-S-H phase. According to this study it is also believed that Pb joins C-S-H in its hydroxide form. Courtesy: Cement and Concrete World, July-August 2010, Pp60 - 67. DELHI IS BIGGEST MARKET FOR TRASH Once the biggest recycler of electronic waste in the country, Delhi is now the biggest scrap market for it. The city gets over 2 lakh tonnes of e-waste from all over the country, which is stored, dismantled and sold, posing a huge health and environmental risk to all those who come in contact with it. There are about four e-waste recycling units around Delhi, but with a poor collection system, a– waste finds its way to landfill sites where it contaminates the soil as chemicals leach the ground. Storage of e-waste is another problem. The government has only recently identified a site in the Kanjhawala industrial area for hazardous waste disposal. It will take about a year before the facility is ready, but the waste continues to be disposed of in landfill sites or stored within the office or residential premises. Courtesy: TEAl (The Energy and Resources Institute) Newswire, 1- 15 February 2011 , P1 7. BIGGEST E-WASTE RECYCLING PLANT ANNOUNCED One of India's leading IT Solutions provider Cerebra Integrated Technologies Ltd recently announced the setting up of the country's largest electronic waste (e-waste) recycling unit in Bengaluru, in collaboration with Cimelia Resource Recovery of Singapore. To be set up on 10 acres of land, the plant is expected to have an e-waste management capacity of 60,000 tonnes annually. The company will be investing Rs. 50 crore for the proposed unit and aims to achieve a turnover of Rs. 250 crore by 2013. A study done in 2009 by the Department of Scientific and Industrial Research, Ministry of Science and Technology, found that e– waste is growing at the rate of 10 per cent annually, with most of the toxic materials ending up in landfills, and subsequently leaching into the soil. Thus the setting up of recycling plants would help in preventing this eventuality. Courtesy: Green Energy, vol.6 Nov.-Dec. 2010, P21. India Country Profile GUJRAT PLANNING TO ESTABLISH ITSELF AS "CEMENT CAPITAL OF INDIA" At a seminar on 'Integrated mm1ng cities' which was organized by the State government and the Confederation of Indian Industry (CII) with the support of the Industrial Extension Bureau (iNDEXTb), at Ahmedabad, Industry Minister Saurabh Patel indicated the intentions of 51