municipal sludge Articles
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Application of Activated Sludge Model No. 1 to biological treatment of pure winery effluents: case studies
ABSTRACTThe practical applicability of computer simulation of aerobic biological treatment systems for winery effluents was investigated to enhance traditional on-site evaluation of new processes. As there is no existing modelling tool for pure winery effluent, a model widely used for municipal activated sludge (ASM1) was used. The calibration and validation steps were performed on extended ...
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Sustainable reuse potential of municipal sewage sludge in south–east Australia
With the aim of reusing municipal sewage sludge, this paper presents the chemical and organic properties of sludge from a major sewage treatment plant in south–eastern Australia. The results show that the concentrations of all OCPs and majority of PAHs were below or close to laboratory detection limits. Concentrations of heavy metals in sludge samples were compared with typical sludge testing ...
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Analysis on key points of sludge thermal drying process
Sludge thermal drying and incineration was the main method of sludge reduction, harmlessness, stabilization, and recycling. Aiming at the problems of jamming, difficulty in transportation, and low combustion efficiency in the current sludge drying process, taking engineering practice as an example, the influence of moisture content on it was discussed. On the one hand, the moisture content ...
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Heavy metal content of Swedish municipal wastewater sludge – status and goals
In 2014, 25% of the sludge produced at Swedish municipal wastewater treatment plants was applied to agricultural land. Even though the Swedish heavy metal limits for sludge to be used in agriculture are amongst the most stringent in the EU, more stringent heavy metal limits are proposed. Most sludge applied to agricultural land is recycled within a certification system, Revaq. Revaq has ...
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Sludge Thickening: Brockville, ON WPCC Upgrades - Case Study
How Chemistry and Mechanics Deliver Cost-effective Waste Treatment Brockville, Ontario municipal waste treatment plant gains a flexible, cost-effective sludge thickening system. Polymer chemistry is one of the leading considerations when designing a sludge thickening system. The right polymer chemistry contributes to more effective thickening at a lower cost. However, the right chemistry must ...
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An interlaboratory comparison study for the determination of dialkyl phthalate esters in environmental and biological samples
A series of interlaboratory comparison exercises were conducted to assess the accuracy of dialkyl phthalate ester (DPE) concentration measurements in environmental and biological samples. Five laboratories participated in analyses to determine DPE concentrations in standard test solutions; marine sediments; three certified reference materials (CRMs), including CARP‐2 (fish muscle) and BCR‐07 ...
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Chitosan use in chemical conditioning for dewatering municipal-activated sludge
This work aims to evaluate the potential use of chitosan as an eco-friendly flocculant in chemical conditioning of municipal-activated sludge. Chitosan effectiveness was compared with synthetic cationic polyelectrolyte Sedipur CF802 (Sed CF802) and ferric chloride (FeCl3). In this context, raw sludge samples from Beni-Messous wastewater treatment plant (WWTP) were tested. The classic jar test ...
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Analysis on key points of sludge thermal drying process
Sludge thermal drying and incineration was the main method of sludge reduction, harmlessness, stabilization, and recycling. Aiming at the problems of jamming, difficulty in transportation, and low combustionefficiency in the current sludge drying process, taking engineering practice as an example, the influence of moisture content on it was discussed. On the one hand, the moisture content ...
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Microbial community structure of a simultaneous nitrogen and phosphorus removal reactor following treatment in a UASB-DHS system
The anaerobic–anoxic sequence batch reactor (A2SBR) was applied to achieve nitrogen and phosphorus removal in an energy-saving sewage treatment system involving an up-flow anaerobic sludge blanket combined with a down-flow hanging sponge reactor to treat municipal sewage. After sludge acclimation, the A2SBR showed satisfactory denitrification and phosphorus removal performance with total ...
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Effects of repeated application of municipal sewage sludge on soil fertility, cotton yield, and nitrate leaching
The effects of sludge application on soil properties and cotton (Gossypium hirsutum L.) response were investigated in an Inseptisol in central Greece. Digested sludge was incorporated in the 0 to 15 cm soil depth at rates of 10, 30, and 50 Mg ha–1, and repeated for four consecutive years. Sludge treatments were compared to an inorganic fertilizer application and an untreated control in a ...
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Removal of endocrine disrupting chemicals in a large scale membrane bioreactor plant combined with anaerobic-anoxic-oxic process for municipal wastewater reclamation
The removal of eight typical endocrine disrupting compounds (EDCs) in a full scale membrane bioreactor combined with anaerobic-anoxic-oxic process (A2/O-MBR) for municipal wastewater reclamation located in Beijing was investigated. These EDCs, including 4-octylphenol (4-OP), 4-n-nonylphenol (4-n-NP), bisphenol A (BPA), estrone (E1), 17α-estradiol (17α-E2), 17β-estradiol (17β-E2), estriol (E3) and ...
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Frequently Asked Questions and Troubleshooting in Activated Sludge Process (Part 3)
Q: What indicators can be detected for the microbiological ratio? And how can it be measured? Answer: The microfood ratio refers to the ratio of the organic matter content to the activated sludge concentration in the biochemical system before entering the biochemical system. Through this ratio, the load can be judged and the operation can be adjusted to avoid sludge aging and overage as well as ...
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A modified anaerobic digestion process with chemical sludge pre-treatment and its modelling
Activated Sludge Models (ASMs) assume an unbiodegradable organic particulate fraction in the activated sludge, which is derived from the decay of active microorganisms in the sludge and/or introduced from wastewater. In this study, a seasonal change of such activated sludge constituents in a municipal wastewater treatment plant was monitored for 1.5 years. The chemical oxygen demand ratio of ...
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Big energy savings through better mixing, less aeration runtime- USNHWW-LOC126.001 (ID135) - Case Study
Topics: wastewater, energy savings, MLSS/TSS, ammonia, odor control, partial mix, sludge reduction Overview: This municipal wastewater treatment system serves a community of approximately 15,000 residents. The wastewater treatment facility is a partial mix lagoon system utilizing aeration, and comprised of 3 lagoons and 1 sludge storage basin. Lagoon 1 is 9.3 acres, 9.3 ft deep, 25.9 MG total ...
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The ion-exchanger–loop-stripping process: ammonium recovery from sludge liquor using NaCl-treated clinoptilolite and simultaneous air stripping
The technical feasibility of an ammonium recovery process (‘ion-exchanger–loop-stripping’) for sludge liquor from municipal wastewater treatment plants is examined. The proposed process combines ion-exchange on natural zeolites with simultaneous air stripping of ammonia to produce an industrial NOx-removal agent. Column experiments with continuously recycled NH4Cl-solutions and a real sludge ...
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Case Study - The performance of the grease degrading bioproduct greasolux in the meat manufacturing factory and municipal WWTP
Problem A municipal waste water treatment plant in one Baltic town continuously had problems with the fat, oil and grease (FOG) accumulation in the sewer lines, lift stations and waste water treatment plant, since the start up of a local meat processing facility. The highly polluted waste water directly impacted the treatment plant in the following ways: Increased grease accumulation in sewer ...
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Principle of Screw Press Dewatering Machine
In the realm of waste management, the screw press dewatering machine stands as a marvel of engineering, employing a sophisticated principle to efficiently separate solids from liquid. This innovative technology plays a crucial role in various industries, from municipal wastewater treatment plants to industrial processes generating sludge. In this post, we'll delve into the principle behind the ...
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Discharge quality from municipal wastewater treatment plants and the Sludge Biotic Index for activated sludge: integrative assessment
Wastewater treatment plants (WWTPs) are scrutinized by Environmental Authorities particularly regarding the compliance to discharge limit values fixed by national and local regulations. An integrated approach is necessary to achieve the objectives established with Directive 2000/60/EC (WFD) considering the ecological status of the receiving water body and the quality of the discharge. ...
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Big energy savings through better mixing, less aeration runtime - Case study
Topics: wastewater, energy savings, MLSS/TSS, ammonia, odor control, partial mix, sludge reduction Overview: This municipal wastewater treatment system serves a community of approximately 15,000 residents. The wastewater treatment facility is a partial mix lagoon system utilizing aeration, and comprised of 3 lagoons and 1 sludge storage basin. Lagoon 1 is 9.3 acres, 9.3 ft deep, 25.9 MG total ...
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A pilot-scale study on PVA gel beads based integrated fixed film activated sludge (IFAS) plant for municipal wastewater treatment
In the present study, a pilot-scale reactor incorporating polyvinyl alcohol gel beads as biomass carrier and operating in biological activated sludge mode (a combination of moving bed biofilm reactor (MBBR) and activated sludge) was investigated for the treatment of actual municipal wastewater. The results, during a monitoring period of 4 months, showed effective removal of chemical oxygen ...
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