sludge recycling Articles

  • Los Angeles County WRRF Embraces Codigestion

    Technology to produce food waste slurry key to project implementation - and helps generators comply with California organics recycling mandates. The Sanitation Districts’ JWPCP in Carson (CA) treats an average of 280 million gallons/day of wastewater. One of the two anaerobic digestion tanks above has been used for codigestion, with the second serving as the control. Photos ...


    By BioCycle Magazine

  • What is a wastewater treatment system and how does it work?

    For industrial companies producing wastewater as part of it’s process, some type of wastewater treatment system is usually necessary to ensure safety precautions and discharge regulations are met. The most appropriate wastewater treatment system will help the facility avoid harming the environment, human health, and a facility’s process or products (especially if the wastewater ...


    By SAMCO Technologies, Inc.

  • Recycling municipal sludge with portable dredges

    Policing the pit. With today's emphasis on resource recovery, even burdensome and seemingly worthless materials are becoming increasingly valuable. Take municipal sludge, for example. For sewage treatment facilities wrestling with the problem of sludge disposal, Liquid Waste Technology may have the answer. The New Richmond, Wisconsin, USA company manufactures dredges and lagoon pumping equipment ...

  • Anaerobic thermophilic digestion of sewage sludge with a thickened sludge recycle

    The process of anaerobic thermophilic digestion of municipal wastewater sludge with a recycled part of thickened digested sludge, was studied in semi-continuous laboratory digesters. This modified recycling process resulted in increased solids retention time (SRT) with the same hydraulic retention time (HRT) as compared with traditional digestion without recycling. Increased SRT without ...


    By IWA Publishing

  • Safe Recycling of Municipal Sludge by Gamma Radiation

    Abstract Municipal sludge contains many toxic organic materials, large number of pathogenic microorganisms, heavy metals alongside many nutrients beneficial to plant and/or animal growth, but its use is limited due to these health hazards contaminants. The technology of irradiation-pasteurization has been shown to quickly, efficiently and reliably deal with potential health hazards ...


  • Application of recycled sludge to stabilize coagulation process

    In conventional treatment of variable quality mountain water, an inability to immediately adjust the coagulant dose to variations in water quality causes overdose or underdose of coagulant in relation to its optimal value. The results of the research showed that the reuse of post-coagulation sludge was an effective method to maintain high and stable coagulation effectiveness under both ...


    By IWA Publishing

  • Multicomponent activated sludge model for reactors in series with recycling

    Multicomponent models containing both substrate and biomass have an advantage over conventional models in seeking better understanding of activated sludge systems. Such models are also useful in the characterisation of wastewater. Studies in recent years have shown that most of the soluble organic matter in the effluent of treatment systems consists of soluble microbial products that arise during ...


    By Inderscience Publishers

  • 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

  • Recycling of Municipal Wastes in Agriculture. I. Sewage Sludge Application to Corn Crop

    Abstract A two year’s field experiment (1995 and 1996) was conducted on a Typic Xerofluvent in order to study the influence of sewage sludge application on corn yield and nutrient uptake. Treatments included control (no sewage sludge, no mineral fertilisation), mineral fertilization (no sewage sludge) and sewage sludge application in total rates from 50 to 130 ton.ha-1 dry sewage sludge, applied ...


  • Long-term effects of the ozonation of the sludge recycling stream on excess sludge reduction and biomass activity at full-scale

    This paper presents a full-scale experience of sludge minimization by means of short contact time ozonation in a wastewater treatment plant (WWTP) mainly fed on textile wastewater. The WWTP performance over a 3-year operational data series was analysed and compared with a two-year operation with sludge ozonation. Lab-scale respirometric tests were also performed to characterize biomass activity ...


    By IWA Publishing

  • Sewage sludge management in Malaysia

    This paper describes the current status of sewage sludge management in Malaysia, including sludge characteristics from both communal sewage treatment facilities and septic tanks. The levels of potentially toxic elements in the sludge are defined and compared to levels elsewhere in the context of the suitability of the sludge for agricultural use. Current sludge disposal practices are reviewed and ...


    By Inderscience Publishers

  • Evaluation of Sludge Treatments for Pathogen Reduction

    The recycling to agricultural land is an important outlet for sewage sludge and other sludges but it must be controlled in order as to obtain agricultural benefit from the sludge whilst protecting human and animal health and the environment at large. Current practices in Europe are based on the requirements of the 1986 Directive on the use of sewage sludge in agriculture (86/278/EEC). Since that ...


  • Sustainable sludge handling for the 21st Century

    Purification of municipal and industrial waste waters leads to the generation of a residue-called “excess sludge”. This material when mechanically dewatered is typically 75-90% water. The balance of the dewatered sludge consists of organic compounds (solid waste, biomass) and inert materials (sand, salts, and metals). These sludges have been to date dehydrated to reduce the aqueous fraction using ...


    By SCFI Group Limited

  • Pollutants in Urban Wastewater and Sewage Sludge

    Untitled Document Executive Summary Water policy in the European Union is aiming to promote sustainable water use and a major ...

  • Identification and assessment of water quality risks associated with sludge supernatant recycling in the presence of cyanobacteria

    This study focussed on the fate of cyanobacteria cells and associated metabolites during the sludge management processes that follow the conventional drinking water treatment train. The topic is of importance, as the release of metabolites during sludge treatment may pose a risk to water quality if supernatant is recycled to the head of the plant. The study of the kinetics of cell damage and ...


    By IWA Publishing

  • 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

  • Evaluation of the single sludge deammonification process for the treatment of plant recycle streams containing a high ammonium concentration

     ABSTRACT An innovative biological process for the treatment of ammonium-rich plant recycle streams from the dewatering of anaerobically digested sludges (“centrate” or “rejection water”) is being evaluated in North America in an unprecedented collaborative technology evaluation program between the New York City Department of Environmental Protection, the District of Columbia Water and ...

  • A new photo-activated sludge system for nitrification by an algal-bacterial consortium in a photo-bioreactor with biomass recycle

    Wastewater treatment technologies requiring large areas may be less feasible in urbanizing regions of developing countries. Therefore, a new technology, named photo-activated sludge (PAS), was investigated to combine the advantages of regular activated sludge systems with those of algae ponds for the removal of ammonium. The PAS consisted of a mixed photo-bioreactor, continuously fed with BG-11 ...


    By IWA Publishing

  • Pollutant removal characteristics of a two-influent-line BNR process performing denitrifying phosphorus removal: role of sludge recycling ratios

    This paper studied denitrifying phosphorus removal of a novel two-line biological nutrient removal process treating low strength domestic wastewater under different sludge recycling ratios. Mass balance of intracellular compounds including polyhydroxyvalerate, polyhydroxybutyrate and glycogen was investigated together with total nitrogen (TN) and total phosphorus (TP). Results showed that ...


    By IWA Publishing

  • The smell of success. Odour management in sludge treatment

    Production of municipal solid waste (MSW) is increasing worldwide, although many – primarily industrialized - countries are making major efforts to cap that growth. In France, for example, MSW production has tripled over the past 25 years. In 2006, the country produced 30 million metric tonnes of municipal solid waste, with a substantial portion of this waste ending up in landfills. In keeping ...


    By Odotech Inc.

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