Given that a wastewater treatment plant (wwtp) discharges 110 mgd treated effluent containing 20 mg/l bod and 2 mg/l dissolved oxygen (do) into a river with flow rate of 15 m3 /s, 5 ppm do, 6 ppm bod and 50 mg/l as caco3, determine the bod and do (both in ppm) just downstream from the sewage outfall.

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?