Net biomass production under complete solids retention in high organic load activated sludge process. (April 2015)

• Record Type: Journal Article
• Authors: Amanatidou, Elisavet; Samiotis, Georgios; Bellos, Dimitrios; Pekridis, George; Trikoilidou, Eleni
• Is Part Of: Bioresource technology. Volume 182(2015)
• Page Start: 193
• Page End: 199
• Publication Date: 2015-04
• Subjects: F/M low food to microorganisms ratio -- SUR low substrate utilization rate -- Yobs observed sludge yield -- ASM activated sludge model -- AS activated sludge -- SRT solids retention time -- WWTPs wastewater treatment plants -- nb non biodegradable -- XU influent unbiodegredable particulates organics -- XE biomass decay -- SNdN simultaneous biological nitrification/denitrification -- PCMAS complete mix extended aeration activated sludge system -- HRT hydraulic retention time; Activated sludge -- Complete solids retention -- Observed biomass yield -- Unbiodegradable organic compounds degradation -- Zero net biomass growth; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.01.119
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Complete solids retention increases MLSS concentration up to a plateau phase. Constant MLVSS to MLSS ratio, low F/M, low SUR and negligible Yobs after 180th day. Organic matter fractions, including cell debris, at complete SRT, are biodegradable. Unbiodegradable compounds slow hydrolysis concept, optimizes ASM Yobs predictions. Abstract: The effect of complete solids retention on net biomass production, at a slaughterhouse's activated sludge wastewater treatment process, was studied for 425 days. The process reached equilibrium after 150 days. In equilibrium phase, and until the end of the study, relative constant MLVSS to MLSS ratio, low food to microorganisms ratio ( F/M ), low substrate utilization rate (SUR) and negligible observed sludge yield ( Yobs ) were measured. Yobs fluctuated between positive and negative values (±0.03 gVSS gCOD −1 ), tending zero mean values, and leading to the conclusion that zero net sludge growth can be achieved. The high BODultimate /COD ratio and the zero sludge accumulation, leads to the conclusion that all fractions of organic matter, including cell debris, are biodegradable. The results were verified by comparing the measured Yobs values and those predicted using a conventional activated sludge model (ASM) and a modified ASM that incorporates the slow hydrolysis concept of the unbiodegradable compounds.