Uso de Wetland construída para tratamento das águas do riacho cavouco

Abstract

The scarcity of basic sanitation infrastructure in urban centers results in severe envi ronmental degradation and public health problems. In Recife, a significant portion of domestic sewage is discharged untreated into water bodies, as occurs in the Cavouco Stream, a tributary of the Capibaribe River. Given the high cost of implementation (CA PEX) and operation (OPEX) of conventional systems, this work is based on Water Sensitive Urban Design (WSUD) to propose and evaluate the technical feasibility of a Vertical Subsurface Flow (VSF) Constructed Wetland phytoremediation system in Cai ara Park. Based on primary data, an influent flow of 69.120 m³/day and Biochemical Oxygen Demand (BOD) concentrations incompatible with Class II waters were found. Theoretical sizing indicated the need for 89.096 m² of filter bed for the complete trea tment of the flow. However, the topographic survey revealed a usable area of 18,000 m², making the integral model unfeasible and justifying the adoption of a bypass sys tem capable of treating 14% of the flow (9.775 m³/day). When comparing this prelimi nary design with the actual pilot project executed on site, it was observed that the engineering adopted an even more conservative hydraulic load (432 m³/day) to gua rantee purification efficiency in the face of the high pollutant load. It is concluded that the system is topographically and hydraulically viable, harmonizing sanitation infras tructure, landscaping, and low operational cost.