Table of Contents
What is Asbr reactor?
An Anaerobic Sequencing Batch Reactor (ASBR) is a high-rate liquid digestion system that retains microflora in the reactor by sequentially feeding influent, mixing the reactor, settling solids, and decanting effluent from the top of the reactor (Figure 1). All operations take place in a single reactor vessel.
What is high rate anaerobic reactor?
The first high rate anaerobic UASB (Upflow Anaerobic Sludge Blanket) reactor in the paper industry was installed by Paques in The Netherlands in 1983. Instead of using energy to convert COD (mainly for aeration), methane is produced in the anaerobic process, resulting in a positive energy balance.
What is anaerobic wastewater treatment?
Anaerobic treatment is a proven and energy-efficient method for treating industrial wastewater. It uses anaerobic bacteria (biomass) to convert organic pollutants or COD (chemical oxygen demand) into biogas in an oxygen-free environment.
What type of reactor is used for SBR?
The sequencing batch reactor (SBR) is a fill-and- draw activated sludge system for wastewater treatment. In this system, wastewater is added to a single “batch” reactor, treated to remove undesirable components, and then discharged.
What is anaerobic sequencing batch reactor?
Anaerobic sequencing batch reactors (ASBR) operate in four cyclic steps: feed, reaction, settling and discharge. ASBRs allow typical biological anaerobic metabolism from substrate consumption to methane and carbon dioxide production.
What is the main concept of high rate anaerobic wastewater treatment?
Anaerobic wastewater treatment is the most energy-efficient technology for treating wastewater. With minimal energy requirement and the conversion of organic pollutants into energy-rich biogas, there’s a double energy gain!
Is sludge digestion aerobic or anaerobic?
Aerobic digestion is the degradation of the organic sludge solids in the presence of oxygen. The oxygen is introduced as fine bubbles of air into the reactor. The micro-organisms in the sludge convert the organic material to carbon dioxide and water, and the ammonia and amino species to nitrate.
What is oxidation ditch?
An oxidation ditch is a modified activated sludge biological treatment process that utilizes long solids retention times (SRTs) to remove biodegradable organics. Oxidation ditches are typically complete mix systems, but they can be modified to approach plug flow conditions.
Which wastewater treatment practice is better aerobic or anaerobic?
Aerobic treatment is typically applied to efficiently treat low strength wastewater (COD <1000 mg/L) when the treatment requires the presence of oxygen. Whereas, anaerobic treatment is typically applied to treat wastewater with higher organic loading (COD >4000 mg/L).
What are the different stages in anaerobic decomposition of wastewater?
The process of anaerobic digestion takes place through four successive stages: hydrolysis, acidogenesis, acetogenesis, and methanogenesis; the anaerobic digestion process is dependent on the interactions between the diverse microorganisms that are able to carry out the four aforementioned stages [9].
Which is better aerobic or anaerobic septic systems?
Septic systems come in many different types. With that said, they generally fall just under two different categories based on how wastewater is treated: aerobic and anaerobic. The former is considered more effective for good reasons: Aerobic bacteria are more active than their anaerobic counterparts.
Why do aerobic treatments produce more sludge?
Aerobic Process in Wastewater Treatment The aerobic bacteria in sewage treatment feed on the water, which is mixed with air. The bacteria reproduce and continue to attack the waste, with some waste settling on the bottom of water as sludge. This sludge may be pumped out of the system so that the system is not clogged.
Why are anaerobic bacteria used in sludge treatment?
Furthermore, anaerobic bacteria are an important element in the wastewater treatment processes. They are responsible for methane fermentation of sewage sludge, facilitating decomposition of macromolecular organic matter into simpler compounds.