sludge drying process Articles

  • Orthophosphate removal from aqueous solutions using drinking-water treatment sludge

    Drinking-water treatment sludge (DWTS) is a by-product generated during the production of drinking water where iron hydroxides are the main component of the sludge. The aim of the study presented here was to determine the effectiveness of using ferric sludge from two underground water treatment stations to remove orthophosphates from a model solution. The analyses were performed in static ...


    By IWA Publishing

  • Pretreatment Requirements for Membrane Bioreactors

    Adequate pretreatment including fine screening is essential to the stable, long-term operation of membrane bioreactors (MBR) used to treat municipal wastewater. The amount of screenings generated by a screen with 1-2 mm size openings ranges between 10-25 dry mg/L. The cost of fine screening represents less than 3% of the total investment cost for a MBR-based wastewater treatment facility. Case ...

  • High dry solids digestion

    ABSTRACTDigestion of sewage sludge normally takes place at pH values between 7,0 and 7,5. Control methods of the process stability are based on practical experience such as the ratio of volatile fatty acids (VFA) and total alkalinity (TA). Thermal sludge disintegration for an enhanced digestion process allows a digester feed with higher dry solids concentrations. This is due to an opening of ...


    By Cambi Group AS

  • High dry solids digestion

    Abstract Digestion of sewage sludge normally takes place at pH values between 7,0 and 7,5. Control methods of the process stability are based on practical experience such as the ratio of volatile fatty acids (VFA) and total alkalinity (TA). Thermal sludge disintegration for an enhanced digestion process allows a digester feed with higher dry solids concentrations. This is due to an ...


    By Cambi Group AS

  • Recycling of Basic Oxygen Furnace (BOF) sludge in iron and steel works

    The recycling and utilisation of iron-bearing by-products such as dust, scale and sludge has been tried and is being practised in many iron and steel-making industries due to its associated benefits. However, the high moisture content of the Basic Oxygen Furnace (BOF) sludge (35?40%) is a major obstacle in its recycling. The management of this waste has become an important issue due to ...


    By Inderscience Publishers

  • Agrior Project, Chaudière-Appalaches, Quebec, Canada

    Compost Drying Application Agrior makes high value organic fertilizers by composting a mixture of animal manure and organic municipal and industrial wastewater treatment sludge. A DRY-REX low-temperature drying system was designed and installed at Agrior’s facility to dry the mixture into high-quality compost. The low-temperature process results in the drying of the manure with minimal ...

  • Three years of operation of North America's first nutrient recovery facility

    The first full-scale nutrient recovery installation in North America became operational in May 2009 at the Clean Water Service's Durham Advanced Wastewater Treatment Plant in Tigard, Oregon. Recovering ammonia and phosphorus from the dewatering side stream as struvite has a positive impact on plant operations. Significantly reducing the phosphorus recycle lowers the phosphorus loading on ...


    By IWA Publishing

  • Uniforet Mill, Quebec, Canada

    Biomass Drying For Bioenergy A DRY-REX low temperature biomass drying system was installed at a Uniforet pulp and paper mill in Quebec to dry sludge produced during the paper making process into a high efficiency biofuel. Prior to the DRY-REX project, the mill was spending millions of dollars to treat and landfill the sludge as waste. The DRY-REX system processed 200 wet tons of sludge a day ...

  • Conservation of iron and lime bearing raw materials by recycling of basic oxygen furnace (BOF) sludge in iron ore sintering

    Basic Oxygen Furnace (BOF) sludge is one of the by–products generated during process of steel making. It has very high level of iron oxide and lime content. However, the high moisture content of the BOF sludge (35–40%) is a major obstacle in its recycling. Internal recycling of the BOF sludge, with or without pre–treatment, is an integral feature of integrated steel plants in advanced countries. ...


    By Inderscience Publishers

  • Struvite Removal & Vivianite Removal Case Study- Heat Exchanger and Screw Press

    A regional wastewater treatment plant in Sonoma County was experiencing problems with struvite on their screw presses and vivianite on their heat exchangers.The plant maintenance staff was forced to shut down the dewatering process every three (3) weeks to clean because of struvite deposits on the screen of the screw press. They also noticed that they were having a difficult time maintaining ...


    By Struvite Removal

  • The potential for thermal energy recovery from wastewater treatment works in southern England

    This paper asks how much heat could be recovered from wastewater treatment plants under UK climatic conditions, and can this heat be used effectively to reduce their carbon footprint? Four wastewater treatment sites in southern England have been investigated and the available heat quantified. Issues relating to the environmental, economic and practical constraints on how this energy can be ...


    By IWA Publishing

  • 2,400,000 m3. Every day. How can you handle the world’s toughest wastewater challenges? - Case Study

    Singapore has one of the highest population densities in the world and its expanding economy and increasing population calls for a highly sophisticated wastewater treatment facility which can keep growing with the country’s needs. Our solution was to design and build the world’s largest municipal sludge drying plant, capable of evaporating up to 55 tons of water per hour. ...

  • Sludge Production

    Specific sludge production in wastewater treatment varies widely from 35 to 85 g dry solids per population equivalent per day (gTS PE-1 d-1). The production of primary sludge is related to the amount of settleable solids in raw wastewater whose solids content is typically of 50-60 gTSS PE-1 d-1 or 110-170 ...


    By IWA Publishing

  • 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

  • Waterboard Hollandse Delta (STW Rotterdam) - Case Study

    Meeting strict demands on nitrogen levels with ANAMMOX® Sewage Treatment System (STW) Rotterdam has a capacity of 620,000 population equivalents and consists of two stage AB process. Waterboard Hollandse Delta was the first to decide on ANAMMOX® as the preferred process for the recovery of nitrogen from the reject water. Fifteen percent of STW’s ...


    By Paques Technology B.V.

  • Paint

    Problem: A paint manufacturer, that produces both oil and water based paints, needed help to solve their liquid sludge problem. At that time the wastewater was batch treated and consisted of a chemical addition process followed by settling. This was to be changed in the near future to a continuous type treatment system. The settled sludge consistency varied form 5% to 10%. The ...


    By HydroCal Inc.

  • Carbonization of johkasou sludge using batch-type equipment

    The carbonization of dehydrated johkasou sludge was examined using batch-type equipment. Based on the temperature changes in the carbonization room and the gas combustion room, the carbonization process was divided into three phases: phase I, drying the sludge, phase II, thermal decomposition of the dried sludge, phase III, after phase II. The times required for phases I and II were strongly ...


    By Springer

  • Waste Water Treatment Facility in Italy Greatly Reduces Volume with Pyrobustor®

    The ARA Pustertal wastewater treatment facility treats residential waste water from an association of 14 municipalities with a collection area of 444 square miles, corresponding to a population of approximately 400,000.  A thermal dryer reduced the volume and weight of approximately 16,000 tons/year of sewage sludge containing 20-25% dry matter. The sludge volume was reduced about ...


    By Eisenmann

  • Two-phase anaerobic digestion for class a biosolids at moccasin bend WWTP

    The Moccasin Bend Wastewater Treatment Plant (WWTP) provides treatment for the City of Chattanooga, Tennessee and the surrounding region. The City has completed upgrades to the solids handling facilities to treat and dewater the primary solids and waste activated sludge (WAS) from the WWTP. This paper summarizes the process to handle the primary solids and the start-up process. Primary solids ...

  • Contributions of homogeneous, heterogeneous and biological iron(II) oxidation in aeration and rapid sand filtration (RSF) in field sites

    In groundwater treatment, after aeration, iron(II) is precipitated in rapid sand filtration (RSF) by homogeneous, heterogeneous and biological oxidation. The contribution of homogeneous iron(II) oxidation may be calculated from equations and constants available in the literature. Heterogeneous iron(II) oxidation produces hydrous ferric oxides coated filter sand, resulting in a growing filter ...


    By IWA Publishing

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