biological fermentation process Articles

  • Continuous hydrogen and methane production in a two-stage cheese whey fermentation system

    The feasibility of integrating biological hydrogen and methane production in a two-stage process using mixed cultures and cheese whey powder (CWP) as substrate was studied. The effect of operational parameters such as hydraulic retention time (HRT) and organic loading rate (OLR) on the volumetric hydrogen (VHPR) and methane (VMPR) production rates was assessed. The highest VHPR was 28 L H2/L/d, ...


    By IWA Publishing

  • Enhancing biological phosphorus removal with glycerol

    An enhanced biological phosphorus removal process (EBPR) was successfully operated in presence of acetate. When glycerol was substituted for acetate in the feed the EBPR process failed. Subsequently waste activated sludge (WAS) from the reactor was removed to an off-line fermenter. The same amount of glycerol was added to the WAS fermenter which led to significant volatile fatty acids (VFA) ...


    By IWA Publishing

  • Recycling Waste Products from Molasses Fermentation: CSR Distilleries

    CSR’s Sarina ethanol distillery has changed from an environmental pariah in the local community into a welcome industry. Through a world-first plant design, it has reduced steam and water consumption, improved plant productivity and product quality, and turned a pollutant into a saleable, import-replacing product. Instead of closing down in the face of community opposition to its environmental ...


  • Review of Primary Sludge Fermentation Performance in South Africa and the USA

     ABSTRACT Primary sludge fermentation as a technology to enhance biological phosphorus removal (EBPR) is now well established. The technology modifies the wastewater composition by converting complex, colloidal and particulate COD to soluble, readily biodegradable COD. This favors the growth of Phosphate accumulating organisms (PAOs) under suitable environmental conditions. There are ...

  • Simultaneous production and separation of biohydrogen in mixed culture systems by continuous dark fermentation

    Hydrogen production by dark fermentation is one promising technology. However, there are challenges in improving the performance and efficiency of the process. The important factors that must be considered to obtain a suitable process are the source of the inoculum and its pre-treatment, types of substrates, the reactor configurations and the hydrogen partial pressure. Furthermore, to obtain ...


    By IWA Publishing

  • Acetic acid recovery from a hybrid biological–hydrothermal treatment process of sewage sludge – a pilot plant study

    A two-stage process consisting of anaerobic fermentation followed by sub-critical wet oxidation was used to generate acetic acid from sewage sludge at pilot scale. Volatile fatty acids, dominated by propionic acid, were produced over 4–6 days in the 2,000 L fermentation reactor, which also achieved 31% solids reduction. Approximately 96% of the carbon was retained in ...


    By IWA Publishing

  • Critical Role of Aerobic Uptake in Biological Phosphorus Removal

    ABSTRACTThe use of biological phosphorus removal (BPR) to remove phosphorus (P) from municipal wastewaters is well-established, and especially in recent years, there has been a significant increase in the number of utilities practicing BPR. The basic BPR mechanism includes two distinct steps: anaerobic P release, and aerobic P uptake. However, BPR design and optimization efforts have typically ...

  • Production of propionic acid-enriched volatile fatty acids from co-fermentation liquid of sewage sludge and food waste using Propionibacterium acidipropionici

    Volatile fatty acids (VFA), derived from sludge fermentation, have been used as one effective carbon source for biological nutrient removal, especially favorable with VFA containing with high levels of propionic acid. In this paper, a new fermentation method was employed to significantly produce the propionic acid-enriched VFA from the co-fermentation liquid of sewage sludge and food waste: ...


    By IWA Publishing

  • Waste Water Treatment Processes Explained

    SUNCOAST WASTE WATER MANAGEMENT  presents  AEROBIC -verses- ANAEROBIC THE AEROBIC PROCESS There are two basic types of sewerage treatment processes, which are the Aerobic process and the Anaerobic process. Aerobic means with air or oxygen and Anaerobic (septic) means without air or oxygen. Aerobic bacteria are a higher life form and when digesting waste are utilising dissolved oxygen or air in ...

  • pH-adjustment strategy for volatile fatty acid production from high-strength wastewater for biological nutrient removal

    Volatile fatty acid (VFA) production from three types of high-strength organic wastewater (cassava thin stillage, starch wastewater and yellow-wine processing wastewater) were compared. The results showed that cassava thin stillage was the most suitable substrate, based on its high specific VFA production (0.68 g chemical oxygen demand (COD)/g initial soluble chemical oxygen demand (SCOD)) and ...


    By IWA Publishing

  • Taking Fossil Fuels to the Next Level - Standards Underpin Extraction, Processing and Distribution

    To the average person, the oil and gas industry may appear simple — a matter of literally tapping into a natural resource and distributing it to customers. Of course the matter of extraction is rarely simple, and in the case of emergent hydraulic fracturing technology, it is particularly complex and capital-intensive. In fact, the world of petroleum and natural gas extraction, distribution ...


    By ASTM International

  • The Devil is in The Details: Full-Scale Optimization of the EBPR Process at the City of Las Vegas WPCF

    ABSTRACTTo optimize the enhanced biological phosphorus (P) removal (EBPR) at the City of Las Vegas’ Water Pollution Control Facility, the effects of dissolved oxygen (DO) level, hydraulic retention time in aeration basin and the operation mode of UCT versus A2O on phosphorus removal performance were investigated. DO levels in the range of 0.5 to 3.5 mg/L in the aeration basin did not have ...

  • Thermal hydrolysis as pretreatment of digestion feed

    AbstractA large number of different processes are today on the market for treatment of biodegradable waste. The two principal biological treatment methods available are aerobe treatment (composting) and anaerobe treatment (digestion/fermentation). In Norway so far, aerobe treatment has been the most popular solution. Both windrow composting and tunnel composting systems are in use. The first ...


    By Cambi Group AS

  • Sludge Treatment and Disposal Technologies

    Most wastewater treatment processes produce a by-product that purifies wastewater before it is released into local waterways. This by-product is named as sludge. Typically in solid, semi-solid or liquid state, it is in fact an amalgamation of all the liquid wastes that are discharged by domestic houses, commercial properties, industry, and/or agriculture after aerobic biological treatment. ...


    By IWA Publishing

  • On the pre–treatment of municipal organic waste towards fuel production: a review

    Lignocelluloses are the main constituents of municipal organic waste (MOW). In order to increase the production of fuels, via fermentations, the enzymatic hydrolysis is the first step towards a valorisation process. It is well–known that the hydrolysis of lignocelluloses is not very effective because of the high stability of the constituents. In this respect the pre–treatment of MOW is necessary ...


    By Inderscience Publishers

  • Polyhydroxyalkanoate (PHA) production from sludge and municipal wastewater treatment

    Polyhydroxyalkanoates (PHAs) are biodegradable polyesters with comparable properties to some petroleum-based polyolefins. PHA production can be achieved in open, mixed microbial cultures and thereby coupled to wastewater and solid residual treatment. In this context, waste organic matter is utilised as a carbon source in activated sludge biological treatment for biopolymer synthesis. Within the ...


    By IWA Publishing

  • Case study - MBT Posen

    Engineering and planning, procurement, production and delivery of machinery and materials handling as well as installation and commissioning of parts of a plant for mechanical and biological treatment. Customer: ZZO Poznan Retention: October 2014 Acceptance: June 2016 Input: Biowaste ...


    By Eggersmann Anlagenbau

  • Microbiology: The Key to Wastewater treatment case study

    The biological treatment of wastewater relies mainly on a consortium of heterotrophic and autotrophic bacteria. The fecal bacteria that are constantly introduced into the collection system are not the optimal bacteria for degrading the contaminants present in wastewaters. The soil bacteria that are introduced through inflow and infiltration are more effective at degrading the wastes and can ...

  • Improved Wastewater Treatment at Hess Collection Winery

    Winery wastewater treatment at Hess Collection Winery (Napa, CA) features floating horizontal brush aerators, data logging, and computer monitoring and control to simplify required water quality reporting. Since installation in 2001, Hess Collection Winery has never been out of compliance with state discharge limits. Wineries generate a strong organic wastewater that is highly depending on ...


    By S & N Airoflo, Inc.

  • Simultaneous clarification and endogenous post denitrification by up-flow through a layer of floating media

    KeywordsBiological nutrient Removal, Post denitrification, Clarifier design, Pilot study IntroductionMethods to comply with the most updated low effluent total nitrogen (TN) regulations include, in addition to a high internal circulation ratio to a pre-denitrification stage, either a large intermediate anoxic zone, or a post denitrification stage with ...

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