sludge drying bed Articles

  • 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 ...

  • Effect of filter media thickness on the performance of sand drying beds used for faecal sludge management

    The effect of sand filter media thickness on the performance of faecal sludge (FS) drying beds was determined in terms of: dewatering time, contaminant load removal efficiency, solids generation rate, nutrient content and helminth eggs viability in the dried sludge. A mixture of ventilated improved pit latrine sludge and septage in the ratio 1:2 was dewatered using three pilot-scale sludge ...


    By IWA Publishing

  • Sludge drying beds, Sarasota County, Florida - Case Study

    Dewatering sludge at wastewater treatment plants has traditionally been a major operational concern. Most large operations must use mechanical filter presses or centrifuges to efficiently dewater their sludge. For many smaller operations, however, this equipment is too expensive and too large for their needs. Therefore, many smaller facilities rely on the sand filter drying beds for sludge ...


    By Presto Geosystems

  • Which plants are needed for a French vertical-flow constructed wetland under a tropical climate?

    Plants are essential in the functioning of constructed wetlands. When setting up systems in tropical areas, Phragmites australis is not always a good choice because of its invasiveness. In vertical-flow constructed wetlands (VFCWs) fed with raw wastewater, the main role of plants is their mechanical action, which helps prevent clogging of the deposited organic matter. Various species have ...


    By IWA Publishing

  • French vertical flow constructed wetlands: a need of a better understanding of the role of the deposit layer

    French vertical flow constructed wetlands, treating directly raw wastewater, have become the main systems implemented for communities under 2,000 population equivalent in France. Like in sludge drying reed beds, an organic deposit layer is formed over time at the top surface of the filter. This deposit layer is a key factor in the performance of the system as it impacts hydraulic, gas transfers, ...


    By IWA Publishing

  • How to Minimize Solids for Disposal while Meeting Stringent Effluent limits: Industrial Park Case Study

    The Renda Industrial Park (RIP) in TaSheh, Taiwan, was required to expand and upgrade its existing 10,000 CMD (2.6 MGD) treatment system to 23,000 CMD (6 MGD) in order serve its expanding client base, and at the same time meet a new < 100 mg/l effluent COD standard. The existing wastewater treatment system of primary sedimentation and extended air activated sludge with chemically assisted ...

  • Aplication of Solar Energy for Drying of Sludge from Pharmaceutical Industrial Waste Water and Probable Reuse

    Sludge, which is produced as a by-product of all treatment processes, has considerable potential as a fertilizer and soil conditioner. Many authorities now discharge the sludge after treatment directly to agricultural land in liquid form, while some others dewater and dry it first. In either case, with proper marketing, it is generally possible for an authority to earn revenue ...


    By University of Tehran

  • Greenhouse gas emissions from sludge treatment reed beds

    Sludge treatment reed bed systems (STRBs) are considered as an alternative technology for surplus sludge treatment. Organic matter is decomposed by various microbial reactions, resulting in gases such as CO2 and CH4 emitting into the atmosphere. The aim of this study is to investigate gas emission from STRBs. The static transparent chamber was adopted to measure gas emission; it allows ...


    By IWA Publishing

  • Performance of a system with full- and pilot-scale sludge drying reed bed units treating septic tank sludge in Brazil

    This study investigated the performance of sludge drying reed beds (SDRB) at full- and pilot-scale treating sludge from septic tanks in the city of Belo Horizonte, Brazil. The treatment units, planted with Cynodon spp., were based on an adaptation of the first-stage of the French vertical-flow constructed wetland, originally developed for treating sewage. Two different operational phases ...


    By IWA Publishing

  • Fate of Pathogens in Sludge Sand Drying Beds at Qateef, Khobar and Dammam: A Case Study

    Due to uncontrolled dump of dried municipal sludge and its use by farmers as soil conditioner and/or fertilizer, an extensive research was conducted in order to determine the microbiological characteristics of municipal sludges produced at three major cities, namely, Qateef, Dammam and Khobar in the Eastern Province of Saudi Arabia. Sludge samples were collected, from sand ...


    By University of Tehran

  • Village of Maybrook, NY Sludge Dewatering System

    Project Summary: The Village of Maybrook WWTP process consists of primary clarification, trickling filters, and secondary clarification. Primary sludge and trickling filter humus is anaerobically digested. The belt filter press dewaters the sludge eliminating the need for sludge drying beds. The belt filter press discharge cake solids are consistently in the 25 to 30 percent range, which is ...


    By BDP Industries

  • 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

  • Solar drying of sewage sludge - An old method with modern technology using Wendewolf®

    Any Sewage Water Work throughout the world will produce sludge, a form of biomass growing in the basins. This biomass has to be evacuated and is, generally speaking difficult to handle! When liquid it has a dry matter of 3 to 4 %, or only 30 to 40 kg per ton of sludge, when mechanically dehydrated to 20 - 25 % most of it is still water, as an average  750 to 800 kg per ton of filter cake. ...


    By IST-Anlagenbau GmbH

  • Cambi thermal hydrolysis - getting the bugs out of digestion and dewatering

    Summary This paper reviews the research some of the work done over the last twenty years on the thermal pre-treatment of sludge and particularly activated sludge. It is demonstrated that the optimum time temperature for thermal pre-treatment is 170°C for half an hour. Pretreatment at 70°C has little or no effect on digestibility and dewaterability. The practical application of this approach in ...


    By Cambi Group AS

  • Municipal WWTP Digester Cleanout - Cambridge, Ohio (Wastewater Treatment) - Case Study

    THE CHALLENGE Cambridge, OH is a small town of 13,000 residents. Tim Wheatley, Superintendent of the Water Pollution Control Center operates a 3 MGD activated sludge plant at about 80% of its capacity. The plant recently switched from anaerobic digesters to an aerobic digester. They had been dewatering Iheir sludge on four vacuum assisted drying beds housed in a large shed. Alternatively, ...

  • Mansfield, Arkansas; ISAM - Integrated Surge Anoxic Mix - Case Study

    City Gets Consistent Compliance, Thriving Discharge Creek, and State Award by Replacing Extended Aeration WWTP with Special Activated Sludge Process. Also Gains Better Reliability, Easier Maintenance, and Exceptionally Low Sludge Yield. Client: Mansfield, Arkansas Solution: ISAM - Integrated Surge Anoxic Mix Background: ...


    By Fluidyne Corporation

  • Fats, Oils & Grease - Dothan, Alabama - Case Study

    F.O.G. Removal in the Collection System By pre-treatment DO;E Little John Digesters reduce F.O.G. deposits by 73.4%. PROBLEM: The City of Dothan, Alabama, faces the same issues that almost all municipalities are attempting to solve, that is, the removal of F.O.G. deposits and preventing its recurrence from "clogging up" their treatment systems. One of ...

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