K D Prasad

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Chlorine Dioxide Substitution During Bleaching of Pulp-An Attempt Towards AOX Reduction in Effluent

In the last 2-3 decades, environmental issues have been the dominant driving force for developmen... more In the last 2-3 decades, environmental issues have been the dominant driving force for development of both pulping and bleaching processes. The bleach plant effluents have traditionally been the major contributors to polluting discharge. Proposed regulations of adsorbable organic halide (AOX) and the consumer's desire to buy environmentally friendly products have led pulp mills to implementAOX reduction strategies. The level of AOX can be decreased by extended delignification, oxygen delignification, substitution of Chlorine dioxide for chlorine, ECF Bleaching and TCF bleaching. The present paper highlights the effects of chlorine dioxide (CI02) substitution in sequence c/DEopDP2 applied to Kraft pulp of mixture of hardwoods and bamboo. Based on lab study, process scale trial up to 40% substitution was conducted. BOD~, COO, AOX and cblor were monitored for the effluent generated from bleach plant besides the regular parameters like brightness, reverted brightness and CEO viscosi...

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Seasonal Variations of the Relationship Between Some Enso Parameters and Indian Rainfall

International Journal of Climatology, 1996

Canonical correlation analysis is used to examine the seasonal relationship between ENSO and Indi... more Canonical correlation analysis is used to examine the seasonal relationship between ENSO and Indian rainfall by analysing their 12 monthly values for an 80-year period. Three ENSO indices are considered. These ENSO indices are the Darwin surface pressure, the sea-surface temperature of the central and eastern equatorial Pacific, and rainfall of central equatorial Pacific islands (hereafter denoted as DSP, SST, and RAIN respectively). The ENSO indices are also analysed for relationships between themselves. The analysis reveals that the seasonal variations of these ENSO indices are. highly intercoupled with no lag. These indices show the minimum association during April and the maximum after the monsoon season. Further, the seasonal variation of the Indian rainfall is found to be better associated with the seasonal variations of SST as compared with that of DSP or RAIN. This association is at its strongest during the period August-October. An apparent reversal in the relationship between ENSO and Indian rainfall is also observed from summer to winter. The warm ENSO years are associated with weak summer monsoon rainfall and at the same time high winter monsoon rainfall.

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A study of the empirical functions of the height fields over India and their relation with the rainfall

Journal of Earth System Science

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Breeding Better Rainfed Rice Varieties Through Farmer Participation: Some Early Lessons From Eastern India

Assessing the Impact …, 2000

Assessing the Impact of PRGA 208 CHAPTER 12 BREEDING BETTER RAINFED RICE VARIETIES THROUGH FARMER... more

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