Nylon fibers as supporting media in anaerobic hybrid reactors: it's effects on system's performance and microbial distribution

Influence of Thermal and Bacterial Pretreatment of Microalgae on Biogas Production in Mesophilic and Thermophilic Conditions

“…Research results indicate that this feature depends mainly on the composition of microbial communities. 22,23 For optimal process, the concentration of acetic acid should not be higher than 2 g l -1 and concentration of propionic acid higher than 0,9 g l -1 . Increased concentration of propionic acid is the most significant indication of process inhibition 45 and occurs following the acetic acid accumulation.…”

“…This provided easier nutrient access for methanogenic microbial community during the thermophilic process, what consequently influenced the increase in methane production. [20][21][22] In the case of biological treatment it is more meaningful if we add live hydrolytic bacteria in to the process, which constantly produce extracellular enzymes and allow the hydrolysis of the substrate (bioaugmentation). 50 The effect of biological pretreatment of microalgae on biogas production is still poorly understood, mainly due to the complexity of the structure of cell walls and species diversity of microalgae.…”

Characterization of the biomass of a hybrid anaerobic reactor (HAR) with two types of support material during the treatment of the coffee wastewater

“…This also depends on their ability to acclimatize and develop a high microbial activity and capacity to bear the hydraulic and biological shocks (Pereira et al 2009). Therefore, an evaluation of the specific methanogenic activity (SMA) of an anaerobic sludge becomes an important analysis for monitoring the process (Chaiprasert et al 2003). The upflow anaerobic sludge blanket reactor (UASB) has difficulties in producing an effluent that accomplishes within the standards set by the environmental legislation.…”

“…Among the anaerobic filters, the hybrid anaerobic reactors (HAR) have the structure of a UASB reactor; however, their bed is composed of composite material in order to support the biofilm formation. This technology is still developing rapidly and its various configurations allow great flexibility in design and construction with regard to the shape, direction of flow and support material (Chaiprasert et al 2003). The purpose of the support material is to retain the bacterial biofilm within the reactor, serving also as a device for separating the solids from the gases, helping to promote a uniform flow in the reactor, improving the contact between the organic constituents of the influent and microorganisms in the biofilm and interstitial forms.…”

Start-up and steady-state conditions of an Anaerobic Hybrid Reactor (AHR) using mini-filters composed with two types of support medium operating under low loading rates

“…In order to take care of the environment that surrounds us, one must consider to treat the wastewaters that can pollute the rivers and soils, and, mainly, to produce appropriate alternatives, as reduction, reutilization and recycle (Chaiprasert et al, 2003;Pereira et al, 2011). The trend is that the productive sector takes the responsibility for the problems of the environmental degradation, and therefore the governmental organizations must exercise a great pressure on the non-governmental organizations (NGOs) and also on the society.…”