Domestic sewage is treated in a septic tank followed by an Up-Flow Anaerobic Filte The phenomenon of granulation of anaerobic sludge. Successful high-rate anaerobic wastewater treatment can only be accomplished when the slowgrowing anaerobic biomass is efficiently held back in the anaerobic treatment system. This biomass retention can be achieved in various ways including immobilization of the organisms on fixed materials.
Innovative biological systems for anaerobic treatment of grain and food processing wastewaters. The application of two innovative fixed film and suspended growth anaerobic biological systems to the treatment of grain and food processing wastewaters is discussed. A fluidized bed fixed film system and a suspended growth membrane system are described.
The technical and economic factors dictating which system is selected for treatment of a specific industrial wastewater are discussed. Case history results from successful operation of full-scale, demonstration, and pilot-scale systems treating respectively, soy whey, cheese whey, and wheat flour processing wastewaters are presented.
Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors. Biohythane production via two-stage fermentation is a promising direction for sustainable energy recovery from lignocellulosic biomass. However, the utilization of lignocellulosic biomass suffers from specific natural recalcitrance.
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Hydrothermal liquefaction HTL is an emerging technology for the liquefaction of biomass, but there are still several challenges for the coupling of HTL and two-stage fermentation. One particular challenge is the limited efficiency of fermentation reactors at a high solid content of the treated feedstock.
Another is the conversion of potential inhibitors during fermentation. Here, we report a novel strategy for the continuous production of biohythane from cornstalk through the integration of HTL and two-stage fermentation. Cornstalk was converted to solid and liquid via HTL, and the resulting liquid could be subsequently fed into the two-stage fermentation systems. The liquid could be efficiently converted into biohythane via the UASB and PBR with a high density of microbes at a high organic loading rate. Biohydrogen production decreased from 2.
The methane production rate achieved a value of 2. The energy and carbon recovery of the integrated HTL and biohythane fermentation system reached up to The fermentation inhibitors, i. Compared with single-stage fermentation, the methane process during two-stage fermentation had a more efficient methane production rate, acetogenesis, and COD removal. The microbial distribution. Enhancing anaerobic treatment of wastewaters containing oleic acid.
Comparison of aerobic granulation and anaerobic membrane bioreactor technologies for winery wastewater treatment. An anaerobic membrane bioreactor and aerobic granulation technologies were tested at laboratory scale to treat winery wastewater , which is characterised by a high and variable biodegradable organic load.
Both technologies have already been tested for alcohol fermentation wastewaters , but there is a lack of data relating to their application to winery wastewater treatment. The anaerobic membrane bioreactor, with an external microfiltration module, was started up for days, achieving a biogas production of up to 0.
Average flux was In contrast, the aerobic granular sequencing batch reactor coped with 15 kg COD m -3 d -1 , but effluent quality was slightly worse. Aerobic granulation was identified as a suitable technique to treat this kind of wastewater due to excellent settleability, high biomass retention and a good ability to handle high organic loads and seasonal fluctuations.
However, energy generation from anaerobic digestion plays an important role, favouring anaerobic membrane bioreactor application, although it was observed to be sensitive to sudden load fluctuations, which led to a thorough pH control and alkali addition. The role of natural wood constituents on the anaerobic treatability of forest industry wastewaters.
Anaerobic treatment has been shown to be an efficient and energy conserving method for treating various types of readily biodegradable non-inhibitory forest industry wastewaters. However, the high toxicity of paper mill effluents derived from chemical wood processing operations has hampered. Anaerobic sequencing batch reactor in pilot scale for treatment of tofu industry wastewater. Rahayu, Suparni Setyowati, E-mail: suparnirahayu yahoo.
The small industry of tofu production process releases the waste water without being processed first, and the wastewater is directly discharged into water. In this study, Anaerobic Sequencing Batch Reactor in Pilot Scale for Treatment of Tofu Industry was developed through an anaerobic process to produce biogas as one kind of environmentally friendly renewable energy which can be developed into the countryside.
The purpose of this study was to examine the fundamental characteristics of organic matter elimination of industrial wastewater with small tofu effective method and utilize anaerobic active sludge with Anaerobic Sequencing Bath Reactor ASBR to get rural biogas as an energy source. The first factor is the amount of the active sludge concentration which functions as the decomposers of organic matter and controlling selectivity allowance to degrade organic matter.
The results of processing the waste of tofu production industry using ASBR reactor with active sludge additions as starter generates cumulative volume of The wastewater treatment of tofu production using ASBR reactor is able to produce renewable energy that has economic value as well as environmentally friendly by nature.
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The anaerobic and anoxic treatment of wastewater in a rotating disc reactor. A new rotation disc reactor for anaerobic and anoxic treatment of wastewater is presented. The discs are covered with a structured textile material for immobilization of bacteria. In contrast to the wellknown rotating disc contactor the discs are completely flooded. A slow rotation causes a flow into the gaps which are formed by the parallel discs and increases the mass transfer rate. For a mean residence time of 45 min and a revolution of 38 min -1 the distribution of residence times corresponds with that of a cascade with four or five steps.
This has a favourable effect on mean reaction rate if the reaction is limitted by substrate concentration. Anaerobic digestion of wastewater generated from the hydrothermal liquefaction of Spirulina: Toxicity assessment and minimization. Zheng, Mingxia; Schideman, Lance C.
Fats, Roots, Oils, and Grease (FROG) in Centralized and Decentralized Systems
HTL-WW contains substantial amounts of residual energy but is toxic to anaerobes. The observed low methane production rates indicated the necessity for anaerobic process optimization. The physicochemical analysis of the digestates demonstrated that most of the compounds identified in the HTL-WW were degraded. Full Text Available Various anaerobic starter seeds from different sources were investigated for their efficacies in treatment of different types of wastewater.
Six combinations of starter seeds and wastewaters were selected out of 25 combination batch experiments and operated in semicontinuous reactors. However, exogenous starter seed can be used across different types of wastewater with or without acclimatization. For Archaea domain, methylotrophic, hydrogenotrophic, and acetoclastic methanogens were also detected. Full Text Available Over the last decades, phytodepuration has been considered an efficient technology to treat wastewaters. The present study reports a bench scale depuration assay of swine wastewater using Lemna minor. The highest observed growth rate obtained in swine wastewater was 3.
The chemical oxygen demand removal efficiency in the swine wastewater assay was Furthermore, the biomass valorisation by anaerobic co-digestion with swine wastewater was assessed. The highest methane specific production, The water-nutrients-energy nexus approach showed to be promising for swine waste management. Lignocellulose-derived thin stillage composition and efficient biological treatment with a high-rate hybrid anaerobic bioreactor system.
Oosterkamp, Margreet J. Background This study aims to chemically characterize thin stillage derived from lignocellulosic biomass distillation residues in terms of organic strength, nutrient, and mineral content. The feasibility of performing anaerobic digestion on these stillages at mesophilic 40??
C and thermophilic 55?? C temperatures to produce methane was demonstrated. The microbial communities involved were further characterized. Results Energy and sugar cane stillage have a high chemical oxygen demand COD o Wang, W. Lurgi coal gasification wastewater LCGW is a refractory wastewater , whose anaerobic treatment has been a severe problem due to its toxicity and poor biodegradability.
The results suggested that thermophilic anaerobic digestion improved significantly both anaerobic and aerobic biodegradation of LCGW. Neutral fat hydrolysis and long-chain fatty acid oxidation during anaerobic digestion of slaughterhouse wastewater. Neutral fat hydrolysis and long-chain fatty acid LCFA oxidation rates were determined during the digestion of slaughterhouse wastewater in anaerobic sequencing batch reactors operated at 25 degrees C. The experimental substrate consisted of filtered slaughterhouse wastewater supplemented with pork fat particles at various average initial sizes D in ranging from 60 to microm.
At the D in tested, there was no significant particle size effect on the first-order hydrolysis rate. The neutral fat hydrolysis rate averaged 0. LCFA oxidation rate was modelled using a Monod-type equation. Pork fat particle degradation was mainly controlled by LCFA oxidation rate and, to a lesser extent, by neutral fat hydrolysis rate.
Hydrolysis pretreatment of fat-containing wastewaters and sludges should not substantially accelerate their anaerobic treatment. At a D in of microm, fat particles were found to inhibit methane production during the initial 20 h of digestion. Inhibition of methane production in the early phase of digestion was the only significant effect of fat particle size on anaerobic digestion of pork slaughterhouse wastewater.
The developments of anaerobic baffled reactor for wastewater Mar 15, As the Treatment of slaughterhouse wastewater in anaerobic sequencing batch reactors. Slaughterhouse waste water was treated in anaerobic sequencing batch reactors operated at 30 degrees C. Two of the batch reactors were seeded with anaerobic granular sludge from a milk processing plant reactor; two others received anaerobic non-granulated sludge from a municipal waste water treatment plant. Influent total chemical oxygen demand was reduced by 90 to 96 per cent at organic loading rates ranging from 2.
Reactors seeded with municipal sludge performed slightly better than those containing sludge from the milk processing plant.