Proposta metodológica para a recuperação de solos e a reutilização total de efluentes sanitários mediante o uso de tecnologias mais limpas

Abstract

The application of methods in order to practice the principles of clean production is paramount to achieve and maintain sustainable systems providing the rational use of raw materials and reuse waste. This work aimed elaborates a methodology for soil recuperation and sewage reuse from Anhumas ETE, Campinas SP, Brazil. The crude sewage was treated by precipitation process using the building construction waste (BCW) and by microfiltration using plain membranes. The sludge decanted from crude sewage by BCW precipitation was mixed to the poor soil for humus manufacture. Liquids extracted from the pre-treated sewage and after filtration into plain membrane were physical-chemistry characterized and reused in irrigation; both are used for corn and beans. Soil with humos was more efficient in production, showing a gain in fertility from 11% to 15.64% for beans and corn, respectively. The cost and benefit analysis the production process of humus was evaluated by accounting for environmental costs methodology; while it obtained a monthly gain of R$ 130,000.00, using data from Anhumas ETE. It can be concluded that the methodology is cost efficient and can contribute to reducing environmental impacts relevant to the disposal of waste, reducing the consumption of potable water for irrigation and agricultural fertilizers, improved fertility of degraded soils and increase food production.