secondary sludge Articles
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Cellular biopolymers and molecular structure of a secondary pulp and paper mill sludge verified by spectroscopy and chemical extraction techniques
For proper treatment, recycling, or disposal of the pulp and paper mill secondary sludge qualitative and quantitative determination of its characteristics are necessary. Chemical extraction, quantitative characterization, and spectroscopic experiments have been performed to determine the molecular composition and chemical functionality of a pulp and paper mill secondary sludge. In order to ...
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Differences in soluble COD and ammonium when applying inverted phase fermentation to primary, secondary and mixed sludge
Primary, secondary and mixed sludge were treated by inverted phase fermentation. This treatment results in solid–liquid separation of sludge after endogenous enzymatic hydrolysis (anaerobic conditions: 42°C, 48 hours). The soluble chemical oxygen demand (sCOD) was increased in the solid phase up to 1,800%, 21,300% and 260% in primary, secondary and mixed sludge, respectively. The ...
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Project - WWTP Grevesmühlen, Germany
Plant: wwtp Elbersroth, Germany Contractor: E&P Anlagenbau, Germany Type of plant: Municipal Wastewater Treatment Plant Start-up: 2017 Application: Mixing for Sludge Stabilization (Primary and Secondary Sludge) in a Primary Sludge Tank Scope of supply: 1 HYPERDIVE - Mixer ...
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Differences in soluble COD and ammonium when applying ultrasound to primary, secondary and mixed sludge
Ultrasound treatment is often applied to enhance the anaerobic digestion of sludge. Optimal conditions for organic matter solubilisation of primary, secondary and mixed sludge were assessed by implementing ultrasound disruption at different specific energies (from 3,500 to 21,000 kJ/kgTS). The variation in soluble chemical oxygen demand (sCOD) and ammonium nitrogen (NH4+-N) was monitored ...
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Combined experiences of thermal hydrolysis and anaerobic digestion
The basic principles of batch thermal hydrolysis process (THP) are well known and have been put into full practice in 20 plants around the world. This paper reviews the historical development of the process and the latest thinking on the application of THP from a number of sources in Europe. An independent investigation of the vendors claims support the data for the benefits claimed to date. The ...
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Combined experiences of thermal hydrolysis and anaerobic digestion latest thinking on hydrolyis of secondary sludge only
The basic principles of batch thermal hydrolysis process (THP) are well known and have been put into full practice in 20 plants around the world. This paper reviews the historical development of the process and the latest thinking on the application of THP from a number of sources in Europe. An independent investigation of the vendors claims support the data for the benefits claimed to date. The ...
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Biosolids management evaluation study for water reclamation facility, Sioux Falls, South Dakota
The Sioux Falls Water Reclamation Facility (WRF) treats primary and secondary sludges in three primary anaerobic digesters and one secondary digester. Treated sludge is stored in lagoons until disposal by land application. Continuation of the land application process will require significant investment. The primary purpose of this study is to evaluate alternative biosolids handling and ...
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Stormwater and lamella settlers: efficiency and reality
ABSTRACTTwo settling devices treating rainwater from urban drainage areas and equipped with secondary sludge treatment were monitored over a period exceeding one year. The two devices differ in their design and in the quantity and quality of effluents received. Full analyses over approximately 30 mean samples of the intake and discharge effluents allowed judgment of the mean efficiency of ...
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Foaming during anaerobic digestion: Causes and Solutions
Foaming during sludge treatment has traditionally been associated with activated sludge systems which have been victim to this phenomenon for several decades. However, foaming has been documented in anaerobic digestion plants, leading, fundamentally, to a reduction in digester capacity and an increase in operational expenditure. The requirements for foaming of: surface active agents, gaseous ...
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Combined experiences of thermal hydrolysis and anaerobic digestion – latest thinking on thermal hydrolysis of secondary sludge only for optimum dewatering and digestion.
ABSTRACT The basic principles of batch thermal hydrolysis process (THP) are well known as a pre-treatment to anaerobic digestion (AD) . Early work done in the 70s in the USA and the 80s in Japan demonstrated the optimum time and temperature for thermal hydrolysis being 340 F for 30minutes. These principles have been put into full practice in 20 plants around the world at plants ranging from 5 ...
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Trials at a sewage treatment plant in Moscow Case Study
At Moscow WWTPs (Kuryanovsky and Luberetsky) ,each having water capacity of 2,5 mln m3/day, all mixture of primary and secondary sludge is digested at 53 °C with SRT=HRT 7 days. The volatile solid reduction (VSR) is about 43-46% and gas production is about 0.33 m3/kg VS fed. In order to increase VSR and gas production many different optimization variants were studied. One of them was ...
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Case Study 3: Pulp and Paper Mill with Screw Press / Rotary Screen Thickener
Pulp and Paper Mill Bleached Kraft (1000 adt/d) and TMP mill, (1400 adt/d) UNOX activated sludge treatment, with primary and secondary clarification. Design flow: 50 MGD (230 MLD) Sludge Production: 89 t/day Application Equipment: FKC screw press with rotary screen thickener Old Mixer: Static mixer with throttling valve New mixer: 6” OPTIFLOC™ Flow: 130 IGPM (10 L/s) ...
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Metropolitan Sewer District (MSD), Cincinnati, Ohio U.S.A.: HTFB System
The Metropolitan Sewer District (MSD) of Greater Cincinnati, Ohio is a 90 mgd primary treatment, 55 mgd activated sludge treatment plant. Solids processing includes gravity thickening of primary sludge, dissolved air flotation, thickening of secondary sludge, holding tank storage, belt filter press dewatering and pumping of cake to the old outdated multiple hearth ...
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Hoosac WQD Williamstown, MA
An aging primary and secondary treatment facility coupled with increased loadings to the co-settling primary clarifier resulted in the need to upgrade the Hoosac WQD. An important component of the upgrade was biosolids handling. Tighe & Bond selected the belt filter press as the bases of design for this 5.37 MGD average daily flow facility. The co-settled primary and secondary sludge is ...
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A fuzzy rule–based approach for modelling effects of bench–scale microwave pre–treatment on solubilisation and anaerobic digestion of secondary sludge
Fuzzy rule–based models were proposed in order to predict the effect of microwave pretreatment on the waste activated sludge (WAS) solubility and anaerobic digestibility or biogas production. The developed models were trained and validated using the experimental data from two separate multilevel factorial designs, containing 24 solubilisation and 54 biogas production runs from batch mesophilic ...
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Pretreatment followed by anaerobic digestion of secondary sludge for reduction of sewage sludge volume
The influence of two pretreatment methods, thermal treatment and low-pressure wet oxidation, on the sludge digestion efficiency was examined. Batch thermophilic anaerobic digestion was used to evaluate the effectiveness of the pretreatment methods in terms of volatile suspended solids (VSS) digestion efficiency and gas production. The results showed that the gas production was not proportional ...
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Simultaneous clarification and endogenous post denitrification by up-flow through a layer of floating media
KeywordsBiological nutrient Removal, Post denitrification, Clarifier design, Pilot study IntroductionMethods to comply with the most updated low effluent total nitrogen (TN) regulations include, in addition to a high internal circulation ratio to a pre-denitrification stage, either a large intermediate anoxic zone, or a post denitrification stage with addition of an external, purchased, carbon ...
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Coupling ASM3 and ADM1 for wastewater treatment process optimisation and biogas production in a developing country: case-study Surat, India
The overall performance of the Anjana wastewater treatment plant (WWTP) located in Surat, India, was assessed by coupling the Activated Sludge Model No. 3 (ASM3) and the Anaerobic Digestion Model No. 1 (ADM1). Guidelines developed by the Dutch Foundation for Applied Water Research (STOWA) were successfully applied for the determination of wastewater characteristics. Concerning the fractionation ...
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The effect of direct addition of iron(III) on anaerobic digestion efficiency and odor causing compounds
The role of iron addition to sewage sludge prior to anaerobic digestion was evaluated to determine the effect of iron on digestion performance and generation of odor-causing compounds. Hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) were the odorous gases evaluated in this study. Samples were obtained from seven municipal wastewater treatment plants (WWTPs), and batch ...
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Dispose of sewage sludge
Sewage sludge treatment describes the processes used to manage and dispose of sewage sludge produced during sewage treatment. Sludge treatment is focused on reducing sludge weight and volume to reduce transportation and disposal costs, and on reducing potential health risks of disposal options. Water removal is the primary means of weight and volume reduction, while pathogen destruction is ...
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