lab digester Articles

  • Lab-scaled digestibility study of wastewater sludge treated by thermal hydrolysis

    ABSTRACT High-solids mesophilic anaerobic digestion (HS-MAD) processes employing thermal hydrolytic pretreatment (THP) have gained much interest in recent years; primarily because they have been shown to produce Class A biosolids in accordance with EPA 503 regulations, but also because they represent an economical approach to the maximization of available anaerobic digester volume. The ...


    By Cambi AS

  • Anaerobic digestion of macroalgae: methane potentials, pre-treatment, inhibition and co-digestion

    In the present study we tested four macroalgae species – harvested in Denmark – for their suitability of bioconversion to methane. In batch experiments (53 °C) methane yields varied from 132 ml g volatile solids−1 (VS) for Gracillaria vermiculophylla, 152 ml g VS−1 for Ulva lactuca, 166 ml g VS−1 for Chaetomorpha linum and 340 ml g VS−1 for Saccharina ...


    By IWA Publishing

  • TOC analyser improves lab efficiency

    Leading instrumentation company HACH LANGE is helping a number of key customers save valuable time and costs with its new IL550 TOC-TN analyser. TOC analysis is vitally important in applications ranging from power generation, wastewater, drinking water, surface water and ultrapure water, to agricultural soils, contaminated land and food. HACH LANGE analysers therefore offer a range of options ...


  • Lab–scale production of biogenic sulphide for metal precipitation in remote areas

    Batch cultures with wheat straw, biomass of Paja Brava (Festuca orthophylla), filter paper, newspaper and beech leaves (Fagus sylvatica) were established to produce sulphide. Sulphide production, sulphate reduction, concentration of Volatile Fatty Acids (VFAs), enzyme activities and Fluorescence in situ hybridisation were determined. Approximately 5 mM of sulphide was produced during anaerobic ...


    By Inderscience Publishers

  • Anaerobic co-digestion of surplus yeast and wastewater to increase energy recovery in breweries

    Surplus yeast is a residue produced during brewery process, which presents high contents of organic matter. Biogas production from yeast could significantly contribute to bioenergy production in breweries, via biogas generation. Co-digestion of surplus yeast and brewery wastewater in a single treatment step would simplify the technical and economical requirements for the transformation of both ...


    By IWA Publishing

  • Anaerobic digestion and thermal hydrolysis to reduce production of sludge in WWTPs

    Abstract Mesophilic and thermophilic digestion of primary and activated sludge was investigated in lab scale reactors. Mixed primary and activated sludge was digested in one experiment and activated sludge was digested alone in another. The same gas yield, COD and dry solids reduction was obtained with both mesophilic and thermophilic digestion. However, more dissolved COD was found after ...


    By Cambi AS

  • A hot chance: exhaustive anaerobic digestion of “grey waste” under temperatures of pasteurization

    According to German laws municipal residual refuse MRR (biowaste, paper and glass are collected in separate bins) must be nearly mineralized before it will be deposited in a landfill, since this material can still contain 20 - 50 % biogenous organic matter leading to gaseous and liquid emissions. Especially the high-organic sieve fraction of MRR below 40 - 60 mm and with a thermal energy content ...


    By ORBIT e.V.

  • Full-stream and part-stream ultrasound treatment effect on sludge anaerobic digestion

    The use of ultrasound as pre-treatment to improve anaerobic digestion of secondary sludge has been established as a promising technology. There are great differences between lab scale and full-scale devices, regarding the relationship between the disintegration achieved and the energy supplied. Based on economic aspects, most of the full-scale plants use partial-stream instead of the full-stream ...


    By IWA Publishing

  • Examination of food waste co-digestion to manage the peak in energy demand at wastewater treatment plants

    Many digesters in Germany are not operated at full capacity; this offers the opportunity for co-digestion. Within this research the potentials and limits of a flexible and adapted sludge treatment are examined with a focus on the digestion process with added food waste as co-substrate. In parallel, energy data from a municipal wastewater treatment plant (WWTP) are analysed and lab-scale ...


    By IWA Publishing

  • Bio hydrogen production from kitchen waste

    The hydrogen producing organisms such as Escherichia coli (E.Coli), Enterobacter cloacae, Hafnia alvei, Citrobacter freundii, Serratia marcescens and Clostridium acetobutylicum strains were isolated from the sludge of biogas plant. The hydrogen producing efficiency of isolated organisms from kitchen waste were examined under anaerobic conditions. Lab scale studies were conducted under controlled ...


    By Inderscience Publishers

  • Increasing biogas yield through addition of food waste

    1. Introduction The Moosburg wastewater treatment plant has one 634,008 gallons anaerobic digester, which was designed to process a maximum 23,775 gallons/day of activated sludge at 3.5% solids. The AD is currently processing 17,170 gallons/day of sludge and producing 39decatherms/day of energy from biogas. The operators would like to better utilize their anaerobic ...


    By Yield Energy Inc.

  • Formation of granules with filamentous microorganisms abundant in anaerobic sequencing batch reactor

    The start-up and granulation in a lab-scale Anaerobic Sequencing Batch Reactor (ASBR) fed with synthetic glucose wastewater were investigated. Sludge granulation proceeded after 110 days operation and was completed in approximately 140 days. Scanning electron microscope images showed that filamentous bacteria like Methanosaeta are abundant in the granule and exhibit in a uniform structure. The ...


    By Inderscience Publishers

  • Design and development of decentralized water and wastewater technologies: a combination of safe wastewater disposal and fertilizer production

    Modern wastewater treatment plants are often inappropriate for communities in developing countries. Such communities lack the funding, resources and skilled labour required to implement, operate, and maintain these plants. This research was conducted to investigate and establish an appropriate wastewater treatment system for the district of Gunung Kidul, Indonesia. Due to its lack of water during ...


    By IWA Publishing

  • Success with water-soluble polymers

    An industrial waste treatment system in Texas used AQUACLEAN / ACF-32 in their plant to reduce BOD, Ammonia, TOC, and TSS. This industrial site was processing water-soluble polymers that were proving to be difficult for their activated sludge system. In the existing system design, the influent stream is first treated by a pH adjustment to a level of 12 or higher, and then is later anaerobically ...


    By BluePlanet Labs

  • Biomineralisation of dye waste in a two-phase hybrid UASB reactor using starch effluent as a co-substrate

    Starch and dye wastes have wide variation in their characteristics were treated on combination; this new technology supports the effective utilisation of starch waste in destruction of dyes. In this investigation, a lab-scale two-phase HUASBR was used at ambient temperature. After start-up, the dye and starch effluent were mixed at different proportions and fed into the reactor. The reactor was ...


    By Inderscience Publishers

  • Enhancement of hydrogen production from Kitchen Waste using heat treated anaerobic biogas plant slurry with pH control

    Hydrogen is found to be a clean energy source; biohydrogen has been researched in recent years. Anaerobic Digestion of Kitchen Waste (KW) for hydrogen production was performed in lab scale reactors, using heat-treated anaerobically digested biogas plant slurry. The biogas plant slurry was given heat treatment at varying temperatures ranging from 70 to 100 ° C for 15 min. Enhancement of hydrogen ...


    By Inderscience Publishers

  • Struvite and Vivianite Screw Presses and Heat Exchanger Removal case study

    A regional wastewater treatment plant in Sonoma County was experiencing problems with struvite on their screw presses and vivianite on their heat exchangers. The design plant flow rate is 7.9 mg/day. They were using 7 mg/L to 10 mg/L (dry basis) of ferric chloride to control hydrogen sulfide and improve solids removal in the primary clarifier. The plant maintenance staff was forced to shut down ...


    By Struvite Removal

  • Wastes as fertilizer – Is this a way to lower food costs?

    Researchers in the UK think they may have found a way to produce fertilizers that should cut farmers’ costs and at the same time boost some types of renewable energy. Their scheme, which involves using waste material from anaerobic digesters and ash from burnt biomass, would also cut fossil fuel use and save natural resources. ...


    By GLOBE Foundation

  • Low temperature microwave and conventional heating pre-treatments to improve sludge anaerobic biodegradability

    This paper presents the results of lab-scale experiments on low temperature thermal pre-treatment (less than 100 °C) prior to anaerobic digestion of sewage sludge. Two heating ways, microwave heating (MH) and conventional heating (CH), and two types of sludge, primary and waste activated sludge, were compared under the same experimental conditions. The degree of solubilisation produced by ...


    By IWA Publishing

  • Southeast Georgia sewage treatment

    Problem: A WWTP in Southeast Georgia located on a resort island has a 3 million gallon per day flow. The WWTP was experiencing major odor problems at the head of the plant, as well as poor digestion and settling of bio-solids in the SBR’s and aerobic digesters. The odors were primarily H2S and were the source of numerous complaints from the residents living in the vicinity of the WWTP. The plant ...


    By BluePlanet Labs

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