Abstract
The objective of this work was the implantation and evaluation of three sludge anaerobic digestionsystems. The system A configuration was defined by five continuous flow sequential anaerobicreactors (SAR) with effluent recycling. System B had the same layout, but recirculation wassubstituted by mechanical mixers installed in each reactor. System C was composed by only onecontinuous flow stirred tank reactor. The systems were evaluated by weekly monitoring of physical-chemical parameters. Samples were taken from influent, effluent and intermediary ports during anoperation period of 115 days. During the most stable operational period (PHASE II), the resultsindicated total solids removal rate of 95, 40 and 29%, and volatile solids removal rate of 95, 34 and22%, for System A, B and C, respectively. The sequential anaerobic reactors (System A and B)presented better performance than conventional digestor (System C).
Highlights
Conventional wastewater treatment plants always generates as by-product the sludge formed in the primary and secondary settling tanks, which needs additional treatment for complete stabilization. there is a trend to apply “lesser sludge production technologies”, it is still very frequent the application of conventional systems generating huge volume of sludge.The final adequate disposal of sludge is a problematic stage in the operational process of a sewage treatment plant and that, normally, has been neglected
The system A configuration was defined by five continuous flow sequential anaerobic reactors (SAR) with effluent recycling
The systems were evaluated by weekly monitoring of physicalchemical parameters
Summary
Conventional wastewater treatment plants always generates as by-product the sludge formed in the primary and secondary settling tanks, which needs additional treatment for complete stabilization. there is a trend to apply “lesser sludge production technologies”, it is still very frequent the application of conventional systems generating huge volume of sludge.The final adequate disposal of sludge is a problematic stage in the operational process of a sewage treatment plant and that, normally, has been neglected. Conventional wastewater treatment plants always generates as by-product the sludge formed in the primary and secondary settling tanks, which needs additional treatment for complete stabilization. There is a trend to apply “lesser sludge production technologies”, it is still very frequent the application of conventional systems generating huge volume of sludge. The final adequate disposal of sludge is a problematic stage in the operational process of a sewage treatment plant and that, normally, has been neglected. The total costs of the sludge treatment units may represent one third of the total investment (VESILIND, 1974) or 50% of the operational budget (BETTIOL & CAMARGO, 2000). Biochemical reactions involved in the anaerobic process may be favored by the creation of distinct environment conditions in the diverse reactors, providing better process stability and higher system performance
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