biological sludge drying Articles

  • Large-scale solar sludge drying in Managua/Nicaragua

    Within the framework of a programme aimed at reducing the biological contamination of Lake Managua, a central wastewater treatment plant for the city of Managua (1.1 million p. e.) was constructed and commissioned at the end of 2009. Annual sludge production amounts to 26,000 m3 and sludge disposal and/or reuse thus present a major challenge. Based on the results of extensive studies, the ...


    By IST-Anlagenbau GmbH

  • Turning biological waste treatment plant sludge into a fuel source

    North Carolina, as part of its landfill regulations, banned all waste treatment plant sludges from general landfills in March, 1989. Cranston Print Works Company was producing approximately 20 tons per day of 18% solid non-hazardous sludge in its extended aeration activated sludge waste treatment plant. Sludge disposal costs were $10,000 per week after the ban took effect. This paper traces the ...


    By Komline-Sanderson

  • Exposure to dust, endotoxin and airborne microorganisms in wastewater sludge thermal drying units

    The objective of this study was to assess workers' exposure to bioaerosols in sludge drying units. Simultaneous collection of inhalable dust and airborne biological agents was carried out using rotating cup samplers (CIP 10, Arelco). Sixteen stationary and 30 personal measurements were performed in three drying plants, during summer and winter. Microbial content of air was characterized by high ...


    By IWA Publishing

  • Slurry Phase Biological Treatment

    Slurry phase biological treatment involves the controlled treatment of excavated soil in a bioreactor. The excavated soil is first processed to physically separate stones and rubble. The soil is then mixed with water to a predetermined concentration dependent upon the concentration of the contaminants, the rate of biodegradation, and the physical nature of the soils. Some processes pre-wash the ...

  • CH#970- Rotating Biological Contactors

    Waste Type: Municipal Flow: 0.99 MGD Problem: Increases in BOD loadings had created a burden for this municipal plant and the operator in charge. Grease build-up had accumulated in the lift stations and a white filamentous film had developed on the RBC's. The plant settled poorly and there was a great deal of foaming on the ...

  • Simulation of sludge dewatering on belt filters

    A mathematical model for belt filters was developed to determine optimum load rate and belt speed during drainage of flocculated biological sludge. Numerical simulations were performed for belt filters with and without plows, and the model fit experimental data well. Experiments showed that highly compressible cakes were formed during drainage, which was important. Due to cake compression, the ...


    By IWA Publishing

  • Sludge dewatering in Circular Economy

    The change of mentality to a circular economy has revealed the importance of reusing and energy recovery from sludge as secondary raw material Circular economy and re-use of waste materials ...


    By Toro Equipment S.L.

  • Sewage Sludge Recycling to Land and Disposal

    The Problem: Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent). A by-product of sewage treatment is usually a semi-solid waste or slurry, called sewage sludge, that has to ...


    By Dirk European Holdings LTD

  • Assessment of pretreatment sludge profile in Istanbul metropolitan area

    In this paper, the results of a comprehensive study on Istanbul's industrial pretreatment sludges are presented. 1042 industrial plants were applying pretreatment in Istanbul. The information gathered from several sources and site visits. Evaluation of the data, together with theoretical predictions indicated that total amount of pretreatment sludge was 100 tons per day on a dry matter basis. ...


    By Inderscience Publishers

  • Factors Affecting Disinfection and Stabilization of Sewage Sludge

    ABSTRACTEffective disinfection and stabilization of sewage sludge prior to land application is essential to not only protect human health, but also to convince the public of its benefits and safety. A basic understanding of the key factors involved in producing a stable biosolid product is a necessary component to ensuring that effective disinfection and stabilization are achieved. Key stressors ...

  • Geotube Dewatering for Lagoon Sludge - Case Study

    Background In many animal waste management schemes it is desirable to separate solids from waste water and/or manures. In cooperation with the Department of Animal and Dairy Science, animal waste specialists from Biological and Agricultural Engineering are field testing a technology new to agriculture, to remove solids from lagoons. The test is currently being conducted at the UGA Dairy ...

  • Methodology for the assessment of the greenhouse gas impact of wastewater sludge treatment

    Nitrous oxide (N2O) and methane (CH4) emissions from the wastewater sector represent the second largest source of greenhouse gas (GHG) emissions of the waste sector. A protocol has been developed to measure GHG from sewage sludge treatment. GHG measurements were performed on two industrial sewage sludge composting plants. Measurement campaigns showed GHG emissions range between 0.18 to 3.40 ...


    By IWA Publishing

  • Prediction of Strutive Formation Potential in EBPR Digested Sludges

    ABSTRACTLow operating costs and less sludge generation associated with EBPR (Enhanced Biological Phosphorus Removal) have led existing wastewater treatment plants to retrofit their phosphorus removal systems and have encouraged new plants to incorporate EBPR into their design. However, in plants that use anaerobic digestion, the introduction of EBPR may result in the formation of scales of the ...

  • Nitrogen Recovery from Sewage Sludge - Case Study

    Ammonium Sulphate from process air The air with which the compost from sludge processor GMB BioEnergie is aerated in the biological drying tunnels contains a lot of ammonia. The emission of this ammonia-rich air led to odor complaints in the past. Now we see this air as a source of nutrients. We pass the air through an air scrubber with sulfuric acid. This sulfuric acid binds the ammoniacal ...


    By Nutrient Platform

  • Pre-ozonation in the activated sludge process: fate of nitrogen species

    The objective of this research was to include ozonation prior to an activated sludge treatment and investigate the effect on the nitrogen species, their fate and the consequences of this oxidation upon the biomass. Three parallel treatment systems were used: the base system, where feed went directly to the activated sludge reactor, and two others, where the influent was ozonated at two different ...


    By IWA Publishing

  • Effect of ozonation on activated sludge from pulp and paper industry

    Aerobic biological treatment with activated sludge is the predominant process all over the world for treatment of pulp and paper industry wastewater. 50–70% of the biodegradable organic material is oxidized to CO2 and the rest is converted to bacterial biomass, typically termed as excess sludge or waste activated sludge (WAS). Handling and disposal of WAS in general and in particular from the ...


    By IWA Publishing

  • Effect of ambient temperatures on disinfection efficiency of various sludge treatment technologies

    Sewage sludge produced during municipal wastewater treatment has to be treated efficiently in order to reduce impacts on the environment and on public health. In Germany and many countries, large quantities of sludge are reused in agriculture in order to recycle nutrients and organic material. In order to quantify the effect of different ambient temperatures on conventional and advanced sludge ...


    By IWA Publishing

  • An interlaboratory comparison study for the determination of dialkyl phthalate esters in environmental and biological samples

    A series of interlaboratory comparison exercises were conducted to assess the accuracy of dialkyl phthalate ester (DPE) concentration measurements in environmental and biological samples. Five laboratories participated in analyses to determine DPE concentrations in standard test solutions; marine sediments; three certified reference materials (CRMs), including CARP‐2 (fish muscle) and BCR‐07 ...


    By John Wiley & Sons, Ltd.

  • Biological recycling of wastes in France: from crisis to new management principles and rules

    In 1992, the context of waste management in France has changed with the publication of a second law that defined the framework of the new public national policy. This law has opened a ten years transition plan, but two main points have been modified. First, the place of landfilling has moved from a status of treatment process in competition with incineration or composting to the role of storage ...


    By ORBIT e.V.

  • Bioaugmentation in Sewer network reduces sludge production case study

    Sludge is an obvious by-product generated from the physical, chemical and biological treatment processes of a wastewater treatment plant (WWTP) as shown in Figure 1. Sludge management, which includes treatment, hauling, and disposal, is one of the biggest burdens facing municipal plants. The costs of sludge management account for 55% of the total WWTP operating cost and 35° o of the capital ...

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