NOPR Collection:

A study on polyethylene microencapsulation of textile sludge

2008-04-09T04:30:30Z

Title: A study on polyethylene microencapsulation of textile sludge Authors: Raji, R Jeevitha; Kanmani, S Abstract: An attempt has been made to encapsulate heavy metals and dyes present in textile sludge using low density polyethylene (LDPE) and assess usability of encapsulated product for building construction. Sludge samples were encapsulated into LDPE with calcium oxide (additive) at four different proportions (35, 40, 50 and 60 %) of sludge. Encapsulated cubes were formed and then tested for compressive strength. Maximum compressive strength of cubes (size, 7.06 cm) containing sludge (50%) for sample 1 (21.07 N/mm²) and sample 2 (17.55 N/mm²) was more than that of standard M15 mortar cubes. Encapsulated product could be recommended for use in the construction of non-load bearing walls. TCLP study revealed that leaching of dyes and heavy metals (Cu, Ni, Pb and Cr) has been effectively reduced after encapsulation process. Page(s): 319-323

Formaldehyde–free sticklac and arhar stick composite board

2008-04-16T04:30:26Z

Title: Formaldehyde–free sticklac and arhar stick composite board Authors: Sao, K P; Pandey, S K; Baboo, B Abstract: Sticklac has been used as a binding material to prepare formaldehyde-free composite board from arhar (Cajanus cajan) stick agro waste. Effects of sticklac obtained from kusmi and rangeeni strain, binder content, press-cycle, particle type, moisture content, density of board and wax emulsion as additive are studied on physical and mechanical properties of board. Tests of modulus of rupture, tensile strength perpendicular to surface of board, screw withdrawal force, water absorption and thickness swelling have indicated that composite board prepared using sticklac in alcoholic solution can meet required standard for interior grade with regard to above properties. Page(s): 314-318

Multigrade bitumen verses conventional bitumen

2008-04-08T04:30:34Z

Title: Multigrade bitumen verses conventional bitumen Authors: Jain, M C; Negi, R S; Krishna, A Abstract: To evaluate field performance at hot and cold climatic regions, test tracks were laid using multigrade bitumen (MB) and conventional bitumen (CB) following 2 cm thick premix carpet, mix seal surfacing, semi-dense bituminous concrete and dense bituminous concrete road specifications at hot climatic region of Jaisalmer (Rajasthan) in May 2006 and cold climatic region of Drass, Kargil (J&K) in September 2005. Laboratory test results indicate that MB (softer grade) behaves better than bitumen 80/100 at low temperatures and better/comparable with bitumen 60/70 at high temperatures. MB has been characterized for conventional, mechanical properties and Strategic Highway Research Programme (SHRP) protocol. Field trial indicates that performance of MB is superior to CB in both cold and hot climatic regions. Page(s): 307-313

Fabrication of Pt based amperometric cholesterol biosensor using cellulose acetate membrane

2008-04-09T04:30:28Z

Title: Fabrication of Pt based amperometric cholesterol biosensor using cellulose acetate membrane Authors: Vikas; Pundir, C S Abstract: Cholesterol esterase, cholesterol oxidase and horseradish peroxidase (HRP) have been co-immobilized onto cellulose acetate membrane, which is mounted over biosensor, Pt electrode. Biosensor showes excellent performance with a linear response between 2.5 to 50 mg dl⁻¹ of cholesterol acetate [correlation coefficient (r) = 0.9912]. Mean analytical recovery of added cholesteryl acetate (100 and 200 mg dl⁻¹) in serum (n=6.0) has been found to be 99.86±0.78 and 97.79±0.73. Cholesterol content of sera within batch and between batch coefficient of variation (CV) are <3% and < 5 %, respectively. Km for cholesterol acetate and Vmax are 1083 mg/dl⁻¹ and 0.5 mA/sec. Optimum pH of biosensor is 7.0 and temperature 45°C. Enzyme electrode lost 50% of its activity during its regular use for 150 times over a period of 25 days at 4°C. The response time is 35 second. Uric acid and ascorbic acid shows slight interference. Page(s): 299-306