Abstract:
Market and deparhent store are sigmficant municipal solid waste sources whichcontain variety of discarded materials including the recyclables. At present the wastemanagement from these sources, particularly the waste recycling is not well-organized andproperly implemented. This study aims to find a recycling model in order to enhance the wastemamgement efficiency. Two aspects of study are carried out; the b t aspect focuses on thestudy of collected basic &ta of the selected 3 private markets and 5 department sstores,comprising waste quantity, waste composition and cham&&ics, current waste managementand recychg effort. The latter aspect involves the study of an appmprkte recycling model h nthe waste stream and assesses its efficiency.Study results fi-om the basic data of the markets showed that the waste generalionrate of 0.11 - 1.85 Kilogcam/squaremeter/day and the generated waste were kitially sorted outfor recyclables by the retailers, followed by the 3 - wheelers and finally by the collection crewsprior to discarding. The avemge recycling rates computed from the 3 - wheelem plus collectioncrews were in the rage of 0.71 - 6.37 percent. Organic matter was the major componentaccounted for 70 percent of the discarded waste.For waste recycling model study, representative waste samples from the market weresorted out by the collection crews into 3 types namely organic waste, hazardous wastes and otherwastes. Waste segregation and recycling did change the waste composition and better facilitateits handling efficiency. Imporved recycling rates of 0.74 - 10.79 percent or 4.23 - 140.74percent increment were achieved in this study. The values of the recyclables in the discardedwaste were also increased fbm 0.01 - 1.00 bahtklogram to 0.02 - 0.16 bahtkilogram.Study results from the basic data of the department stores indicated that wastegenemtion rate of 0.02 - 0.07 Kilogtam/squaremeter/&y and waste segregation practice startedat the retail shops and accompanied by the department store attendants prior to discarding. Thediscarded waste was further sorted out by the municipality collection crews and the scavengersat disposal sites. The average recycling rates as computed from the collection crews plus thescavengers ranged fkom 0.52 - 5.77 percent. Major components of the discarded wastecomprised paper, plastic, organic waste, glass and metals, all of which were potentially capableto be recycled.For recycling model study of the department stores, representative waste sampleswere segregated, by retail shop operators and collection crews of the department stores, into 4groups namely organic waste, paper and plastic, glass and metals, and hazardous wastes. Wastesegregation and recycling helped to alter the waste composition and facilitate the handlingefficiency; upgrading the previous recycling rates to 1.11 - 14.95 percent or 64.55 - 159.10percent increment; the values of the recyclables in the discarded waste were also increased from0.02 - 0.08 baht/kilogram to 0.03 - 0.24 bahtkilogram; and reducing the frequency of wastecollection for the department store about 5 - 6 trips/week.