Quantificação e caracterização dos resíduos sólidos na drenagem urbana na bacia Grota do Cigano – Maceió – Alagoas

Abstract

The objective of this study was to quantify and to characterize the litter reaches a crosssection of a channel drains the Grota do Cigano catchment and also to verify a possible relation between the rainfall and the amount of litter. The catchment has 48 ha drainage area and it is at the Maceió, Alagoas, Brazil. To realize the research na inlet trap (screen) was installed in the cross section. Next to her, the captured litter was weighed and characterized. Rainfall data of two stations were used. Were analyzed 24 h total rainfall (mm) and 24 h total amount of litter (kg). The results indicated no relation between the variables. Field observation also indicated that probably the rainfall disaggregates litter dumped continuously into the channel, without necessarily drag them during its occurrence. From the average value of the measurements it has been estimated that the annual load reaches channel can be between 1.216,4 kg.ha-1.ano-1 and 3.405,8 kg.ha-1.ano-1. These values are estimated from possible efficiencies available in the literature for trash racks (between 5% and 14%). The values are high, but like other researches, the presence of plastic bags was common. There was also a large presence of woods and PET bottles.