Development of appropriate technology for treatment of molasses-based wastewater

Abstract

In this study, the performance of a proposed treatment system consisting of an anaerobic process (acidification, methane fermentation) and an aerobic process (trickling filter) was evaluated for treating high concentrations of molasses-based wastewater (43-120 gCOD/L) by a continuous flow experiment. An anaerobic up-flow staged sludge bed (USSB) reactor, equipped with multiple gas solid separators, was used as the main treatment/methane recovery process. The USSB showed good efficiency of both COD removal (80-87%) and methane recovery (70-80%) at an organic loading rate of 11-43 kgCOD/m(3) day. As the influent COD concentration was increased, the organic loading rate for stable operation of the USSB was reduced due to cation inhibition. However, the COD removal efficiency of the whole treatment system (including the aerobic post-treatment process) was 96% even at an influent COD concentration of 120 gCOD/L. Use of the treated wastewater as a fertilizer and/or irrigation-water for sugarcane was evaluated by a field cultivation test. Both growth of sugarcane and emission of greenhouse gases from the field soil were measured. A relatively high methane flux (352 μgCH4/m(2) h) was observed when the treated wastewater from day 0 was used. By day 3, however, this value was reduced to the same level as the control. In addition, growth of sugarcane was satisfactory when the treated wastewater was used. The treated wastewater was found to be useful for cultivation of sugarcane in terms of both a low risk of greenhouse gas emission from the field soil and effectiveness for growth of sugarcane.

Greenhouse gas emissions from open-type anaerobic wastewater treatment system in natural rubber processing factory

“…DNA was extracted from the sludge harvested from compartments 16 and 33 using an Isoil beads beating kit (Nippon gene, Japan). About 806 bp of 16S rDNA was amplified by a polymerase chain reaction (PCR) using the primers A 109f-m (5'-AM DgC TCA gTA ACA CgT-3') and ARC915R (5'-gTg CTC CCC CgC CAA TTC CT-3'), specific for domain Archaea (Syutsubo et al, 2013).…”

Acceptance Factors of Appropriate Technology: Case of Water Purification Systems in Binh Dinh, Vietnam

“…However, previous literature merely studied AT's acceptance, and a majority of AT research topics focused on either theoretical concepts [4,[8][9][10][11][12] or its engineering aspects [13][14][15]. Further, Uddin et al [16] investigated Muslim communities' sociocultural acceptance of urine-diversion toilets in Bangladesh through surveys and interviews with the local population.…”

Reuse-focused selection of appropriate technologies for municipal wastewater treatment: a multi-criteria approach

“…Several studies have been conducted for selection of appropriate technology for specific type of waste waters, e.g., domestic (Kalbar et al 2012 ), molasses-based wastewater (Syutsubo et al 2013 ), industrial wastewater (Castillo et al 2017 ), disinfection technologies selection for reuse (Gomez-López et al 2009 ), etc. However, the procedure for the selection of an appropriate technology that suits both local environment and reuse quality criteria is not yet defined.…”