sewage sludge dewatering Articles

  • A review on sludge dewatering indices

    Dewatering of sludge from sewage treatment plants is proving to be a significant challenge due to the large amounts of residual sludges generated annually. In recent years, research and development have focused on improving the dewatering process in order to reduce subsequent costs of sludge management and transport. To achieve this goal, it is necessary to establish reliable indices that ...


    By IWA Publishing

  • Phyto-dewatering of sewage sludge using Panicum repens L.

    Experiments in the field environment have been conducted to study the growth of Panicum repens L., an aquatic plant, in the sewage sludge matrix. The experiments were also carried out to investigate the ability of this plant to dewater sewage sludge to increase the capacity of conventional drying beds. In addition, the ability of Panicum repens L. to reduce the sludge ...


    By IWA Publishing

  • Dewatering of Industrial Sludge - Case Study

    At Ten Cate Protect, town of Nijverdal, The Netherlands, 2006 During the wastewater treatment process at Ten Cate Protect large quantities of sewage sludge are liberated. A couple of days per week this sludge is transported in tanker trucks to a waste disposal plant. On June 14th 2005 a Geotube MDS unit was put in operation at Ten Cate Protect to separate and condense the sludge of the aerobic ...

  • New processes for the improvement of sludge digestion and sludge dewatering

    INTRODUCTIONThe examination of numerous sewage sludges from municipal wastewater treatment plants leads to the conclusion that on the one hand dewaterability of these sludges worsens and that on the other hand dewaterability of sludges becomes more and more important due to increasing disposal costs. Especially wastewater treatment plants with inflows from the food processing industry often face ...


    By Cambi Group AS

  • 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 ...

  • 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

  • Processing Wastewater Sludge Using Dewatering Containers

    The relative cost of dewatering equipment varies widely and is directly related to the processing rate. For smaller utilities that need to dewater sludge in batches, dewatering containers are an alternative that can be relatively inexpensive and simple when compared to other technologies on the market. The most common type of dewatering container is based on a roll-off box design, although any ...

  • Kemicond - Improvement of the Dewaterability of Sewage Sludge by Chemical Treatment

    The Kemicond process for sludge conditioning consists of a chemical treatment with sulphuric acid and hydrogen peroxide at a pH-value around 4 followed by a dewatering unit. It is shown that through the chemical treatment of ferruginous digested sludge the dewaterability, measured in laboratory experiments as CST-value, can be improved. From the results of the experiments, it is concluded that ...

  • The impact of advanced digestion on incineration of sewage sludge

    Abstract Traditionally, when incineratin sewage sludge, it was preferable to burn raw undlgested sludge, as digestion - by extracting some of the energy from sludge- subsequently reduce its calorific value. However, when considering incineration as part of a wider strategy, the desicion whether or not to include digestion becomes less clear. Since, virtually all of the requirements of ...


    By Cambi Group AS

  • 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

  • Improved dewatering of CEPT sludge by biogenic flocculant from Acidithiobacillus ferrooxidans

    Bioleaching using an iron-oxidizing bacterium, Acidithiobacillus ferrooxidans, and its biogenic flocculants was evaluated to improve the dewaterability of chemically enhanced primary treatment (CEPT) sewage sludge. CEPT sludge in flasks was inoculated with A. ferrooxidans culture, medium-free cells and the cell-free culture filtrate with and without the energy substance ...


    By IWA Publishing

  • Energy recovery from thermal treatment of dewatered sludge in wastewater treatment plants

    Sewage sludge is a by-product generated from municipal wastewater treatment (WWT) processes. This study examines the conversion of sludge via energy recovery from gasification/combustion for thermal treatment of dewatered sludge. The present analysis is based on a chemical equilibrium model of thermal conversion of previously dewatered sludge with moisture content of 60–80%. Prior to ...


    By IWA Publishing

  • Thermal hydrolysis, anaerobic digestion and dewatering of sewage sludge as a best first step in sludge strategy: full scale examples in large projects in the UK and strategic study including cost and carbon footprint.

    Abstract This paper shows that by using thermal hydrolysis process (THP) as a pre-treatment for anaerobic digestion (AD) it is possible to develop a step wise approach to sludge strategy that is cost effective and flexible. By generating a low volume of non odorous, well dewatered and safe digested cake it is possible to recycle sludge directly to agriculture or dry it for fuel use or ...


    By Cambi Group AS

  • The thin-layer drying characteristics of sewage sludge by the appropriate foaming pretreatment

    As dewatered sludge is highly viscous and sticky, the combination of foaming pretreatment and drying process seems to be an alternative method to improve the drying performance of dewatered sludge. In this study, CaO addition followed by mechanical whipping was employed for foaming the dewatered sludge. It was found that the foams were stable and the diameters of bubbles mainly ranged from 0.1 ...


    By IWA Publishing

  • Land application of sewage sludge (biosolids) in Australia: risks to the environment and food crops

    Australia is a large exporter of agricultural products, with producers responsible for a range of quality assurance programs to ensure that food crops are free from various contaminants of detriment to human health. Large volumes of treated sewage sludge (biosolids), although low by world standards, are increasingly being recycled to land, primarily to replace plant nutrients and to improve soil ...


    By IWA Publishing

  • Large scale reality of sewage sludge paseteurisation and thermal hydrolysis

    ABSTRACT Two large scale projects have been successfully brought on line utilising the thermal pretreatment to ensure production of a Class A biosolid product. In Reading (UK), the sludge is pasteurised prior to mesophilic anaerobic digestion while in Dublin (Ireland), the sludge is both pasteurised and hydrolysed prior to digestion. Sludge is pasteurised by holding a batch of sludge at ...


    By Cambi Group AS

  • Effect of the addition of rice straw on microbial community in a sewage sludge digester

    Rice straw was added to a sewage sludge digester and its effects on methane production, dewatering characteristics, and microbial communities in the digested sludge were examined by a continuous digestion experiment under mesophilic conditions (35 °C). Stable gas generation was monitored in all digestion experiments. Methane yield from raw sludge, chopped rice straw and softened rice ...


    By IWA Publishing

  • Influence of conditioning agents and enzymic hydrolysis on the biochemical methane potential of sewage sludge

    Biochemical methane potential (BMP) tests have been carried out on sewage sludge from two wastewater treatment plants to assess the effect of additives (FeCl3 and two cationic polyelectrolytes) used in sludge dewatering. BMP tests were also carried out on the concentrated solid phase from the enzymic hydrolysis pre-treatment (42 °C, 48 h). FeCl3 had no significant effect on ...


    By IWA Publishing

  • Quantifying the impacts of co-digesiton of waste streams with sewage sludge

    In order to slow down the impending impacts of global climate change due to consumption of fossil fuels, governments are looking at ways to develop and incentivise alternative renewable energy sources. Subsequently, the UK has imposed renewable energy targets of 15% of all energy consumption by the year 2020, but admit that – in order to meet carbon dioxide reductions of 20% by 2020 – renewable ...


    By United Utilities

  • Sewage treatment plant case study

    Contributing to snowy regions in which the transportation of sludge is difficult In municipal wastewater treatment plant in snowy regions, snow-bound in winter, taking dewatered cake out regularly is sometimes difficult. Two problems were also presented in this municipal wastewater treatment plant, i.e., the difficulty of taking sludge out using carriers in winter, which had been ...


    By AMCON Inc.

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