Journal of the Selva Andina Research Society (Aug 2011)
Evaluation of a treatment system wastewater prebeneficiado of coffee (Coffea arabica) implemented in the community Carmen Pampa province of Nor Yungas of La Paz Department
Abstract
This research was conducted in prebeneficiadora coffee plant of UAC-CP, located in the community of Carmen Pampa, Coroico Municipality, Nor Yungas of La Paz department. The objective was to determine the efficiency of wastewater treatment prebeneficiado coffee because it is not known to be effective in reducing the level of contamination of treated wastewater, and according to the results to correct and / or validate directly model system in place. For their study was established seven sampling points within the system of treatment and four replications were made at different times and with different amounts of coffee cherry. We evaluated the parameters of temperature, pH, settleable solids, total suspended solids, fixed and volatile, biochemical oxygen demand, chemical oxygen demand and dissolved oxygen. The temperature of wastewater entering the system has recorded 16.5 o C, increasing during the treatment process at 17.5 °C and record the output is 16.5 ºC. The pH increased from 4.51 to 6.04 which occurred at the last two gaps oxygenation and not in the neutralization tank. Settleable solids (SS) increased from 0.1 mg / L to 0.15 mg / L, which was recorded at the lakes of oxygen, is attributed to the drag of fine gravel. Total suspended solids (TSS) have been reduced from 1927.5 mg / L to 299 mg / L gradually throughout the treatment process. Fixed suspended solids (SSF) were reduced from 137.5 mg / L to 58.5 mg / L. Volatile suspended solids (VSS) were reduced from 1790 mg / L to 240.5 mg / L. Biochemical oxygen demand (BOD) was reduced from 6102.5 mg O2 / L to 1245 mg O2 / L. The chemical oxygen demand (COD) was reduced from 9800 mg O2 / L to 1658.75 mg O2 / L. Dissolved oxygen (DO) increased from 0 to 2.4 mg O2 / L, in the last two gaps in oxygenation, due to the reduction of solids and chemical oxygen demand and biochemical oxygen. Of the nine parameters measured, six meet the maximum permissible values for download in source receptor (stream) and three of them are outside the parameter according to the regulation of Law 1333.
