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Evaluation of an anaerobic baffled bioreactor performance in the manipueira biological treatment

Grant number: 10/16631-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): February 01, 2011
Effective date (End): July 31, 2011
Field of knowledge:Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
Principal researcher:Vanildo Luiz Del Bianchi
Grantee:Anelyse Rondina
Home Institution: Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil

Abstract

Anaerobic digestion of industrial liquid waste provides an excellent control of pollution and produce energy alternative that can supply part of the energy needed to plant, as heating boilers, motor drives and generators, etc, replacing in part the oil products and electricity. It is very used to treat various organic wastes. The operation of anaerobic digestion is only possible when it has a reactor with a high rate that promotes organic biomass greater interaction with the substrate and separates the hydraulic retention time (HRT). Manipueira is an wastewater from cassava flour production, being a very strong pollutant. Due to its high chemical oxygen demand (50000-70000 mgBOD / L), the "manipueira" cannot be dismissed without prior treatment. With this work, it is expected an efficient treatment for the removal of COD and a hydraulic retention time shorter. The anaerobic baffled reactor used is constructed of glass (4mm thick) with a volume of 4.9 L (10cm x 14cm x 35cm), equally divided into five compartments. It is one of many models of high-rate reactors that are able to separate the hydraulic retention time (HRT) of solids retention time (SRT). This allows anaerobic microorganisms remain inside the reactor and increase the efficiency of it. The anaerobic biodegradation depends on a stable and diverse microbial population. In anaerobic reactors success of the process is connected to two basic conditions: the system must be able to guarantee the permanence of the great mass of anaerobic bacteria biodegradable active and promote intense contact between this mass of microorganisms and the material to be digested. For pH, methane production by bacteria occurs in the range 6.8 to 7.4, and values below 6.0 can completely inhibit the generation of methane. The pH control is mainly aimed at eliminating the risk of inhibition of methanogenic bacteria by low pH values, thereby avoiding the failure of the process. The occurrence of sudden changes in pH can affect the process negatively, damaging bacteria permanent or temporary. Regarding the wastewater will be analyzed in the COD, volatile solids (VS), total solid (TS), methane gas and pH control. And there will be a patch of mud and a control of the hydraulic retention time (HRT) related to the treatment efficiency and the reduction of organic load. (AU)

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