Sanasa Campinas was one of the first sanitation companies in Brazil to add fluoride to water treatment.
The result was a significant decrease in the incidence of caries in the population. This pioneering, to a certain extent, reveals the ability of the public authority of Campinas to invest in actions that result in a model for the country.
This type of action has guided the conduct of Sanasa. According to the ranking of the best companies in Brazil, published by the Valor 1000 magazine of 2012, the Campinas sanitation company was named the 6th best in the sector in Brazil and the first municipal company in the country.
- Location of Campinas
- Population: 1.173.370 million inhabitants
- Area: 796.4 Km²
- Northern boundary: Jaguariúna
- East boundary: Pedreira, Morungaba and Valinhos
- Southern boundary: Itupeva and Indaiatuba
- Westbound: Monte Mor
- Northwest boundary: Sumaré, Hortolândia and Paulínia
- Districts: Sousas, Barão Geraldo, Joaquim Egídio and Nova Aparecida
The municipality of Campinas has a territorial area of 796.4 km², occupying the urban area an extension of 388.9 km2. Its population is more than 1 million inhabitants, 98% of it established in the urban area.
Campinas has a subtropical climate of altitude, with hot and humid summer and mild and almost dry winter. The average annual precipitation is 1,380 mm, 75% of it distributed over the semester October / March. The average temperature is on the order of 22 ° C. Relative air humidity – annual average – is 72.1% and the average sunshine in the year is 2,628 hours.
As for the hydrography, Campinas is located integrally in the Tietê River Basin, receiver of the waters of its direct margin tributaries, the Piracicaba River and the Capivari River. In its northern part, Campinas is crossed by the Jaguari and Atibaia Rivers, formers of the Piracicaba River, from its confluences in the municipality of Americana.
In the western part of Campinas, we highlight Ribeirão Quilombo, whose springs are located between the districts of Chapadão and Amarais, and flow into the left bank of the Piracicaba River after crossing the municipalities of Sumaré, Nova Odessa and Americana. In the South, Campinas is crossed by the Capivari River, a direct tributary of the Tietê River, after developing by the municipalities of Monte Mor, Capivari, Rafard and Mombuca.
The internal drainage network of the municipality, composed of streams and streams, is very dense, all convergent for the three large sub-basins mentioned (Atibaia / Jaguari, Quilombo, Capivari), responsible for the depletion and transport of rainwater and water.
SANASA was one of the first Latin American companies to implement MBR system for municipal wastewater treatment: EPAR Capivari II designed to treat wastewater from 176,000 inhabitants.
The first step of the pretreatment is multi-rake bar screens (15mm bars), followed by rotary drum perforated plate screens (2mm punched hole) and settling grit chambers. After pretreatment, sewage flows by gravity to the bioreactors.
There are two bioreactors in the plant, one was built during the first stage of construction and started up in 2012. The other one, that was part of second stage of construction, was commissioned in November of 2014. Since then the plant has capacity to treat 360 L/s (daily average flow). Each bioreactor is followed by three membrane trains.
The bioreactors are operated in parallel. They are divided in four zones: anaerobic (1,687m³), anoxic (1,687 m³), aeration tank (4,278m³) and deoxygenation (728m³). The mixed liquor, with designed suspended solids concentration ranges from 8 to 10 g/L, is then pumped from aeration tank to ultrafiltration trains. The type of membrane used is submersed, hollow fiber with 0.04 µm nominal pore. Return sludge from membrane trains flows to deoxygenation zone.
Each membrane train has circa 150m³ volume and 12,000 m² filtration area, corresponding to 72,000m² filtration area in the whole plant. Average flux is 19 LMH, but during peak flows it can reach 29 LMH.
The high quality of treated effluent (permeate) is shown by process stability and excellent analyses results achieved during the whole period of operation: BOD below 1.5 mg/L, TSS below 5 mg/L and turbidity below 0.5 NTU. Due to removal efficiency obtained in microbiological parameters.