Uprating of Mogden Sewage Treatment Works

2000 ◽  
Vol 41 (9) ◽  
pp. 53-61
Author(s):  
A.V. Koodie ◽  
I.J. Kirkaldy
Keyword(s):  
Sewage Treatment ◽  
Treatment Plant ◽  
Cost Savings ◽  
Control Cost ◽  
Process Improvements ◽  
The Us ◽  
Major Process ◽  
Urban Wastewater Treatment ◽  
Sludge Thickening ◽  
Research Budget

Mogden Sewage Treatment Works treats a population equivalent of approximately 1.8 m people from a catchment area of 160 sq. kilometres in North and West London. Substantial improvements have been undertaken over recent years including the automation of the works and major process improvements providing new sludge thickening facilities. In order to satisfy new obligations on treatment capacity set by the EC Urban Wastewater Treatment Directive a series of trials evaluating innovative and novel alternatives to conventional design were conducted. The “Mogden Trials” as they became known were granted a £1m research budget from the Thames Water capital release committee, however, substantial cost savings from an original capital control cost of £85m (NPV £141m) were considered possible. This paper describes how the savings were achieved through the trials and the assessment of options and provides details on the process of uprating the treatment plant including the successful partnering agreement between the owner/operator Thames Water and the US based company Black and Veatch.

Life Cycle Assessment of Urban Wastewater Treatment

2014 ◽  
Vol 535 ◽  
pp. 346-349
Author(s):  
Mei Wang ◽  
Ming Yang ◽  
Jun Liu ◽  
Jian Fen Li
Keyword(s):  
Wastewater Treatment ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Wastewater Treatment Plant ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Urban Wastewater ◽  
Urban Sewage ◽  
Urban Wastewater Treatment ◽  
Whole Life Cycle

Effect and benefits of a product or service could be analyzed and evaluated by life cycle assessment during the whole life cycle. Urban sewage treatment plants could improve and control urban water pollution escalating, but it also had certain harm to environment. Effect and benefits of urban wastewater treatment plant A and B were analyzed and evaluated, 13 factors were selected, and comprehensive benefits were researched quantificationally using the method of analytic hierarchy process. It found that urban wastewater treatment plant A who applied A/O process had better benefits than urban wastewater treatment plant B who applied BIOLAK process.

Automation and Optimisation of Centrifuge Sludge Dewatering

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1319-1324 ◽  
Author(s):  
Gunter Schrank ◽  
Clive Murren
Keyword(s):  
Continuous Measurement ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Effective Control ◽  
Excess Sludge ◽  
Chemical Additives ◽  
Sludge Dewatering ◽  
Sludge Thickening ◽  
Very High

The dehydration of sewage treatment plant sludges has become one of the major problems in the treatment of waste Water. Very high costs, especially those of flocculation additives, increasingly call for optimisation of this phase of the process. Taking the dewatering of sludge by centrifugation as an example, two different approaches can be considered: mechanical excess sludge thickening without the use of additives and the dehydration of sewage sludge with use of chemical additives. A prerequisite of any automation is the reliable acquisition of data of the parameters required for control. Continuous measurement of the concentration of suspended solids in the sludge that is to be dewatered, of sludge flow and of the turbidity of the clear phase (centrate) leaving the centrifuge, make it possible to design several methods of effective control.

The ScanDeNi® process could turn an existing under-performing activated sludge plant into an asset

2003 ◽  
Vol 47 (11) ◽  
pp. 31-36 ◽  
Author(s):  
B. Rosén ◽  
C. Huijbregsen
Keyword(s):  
Activated Sludge ◽  
Operating Cost ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Cost Savings ◽  
Nitrifying Bacteria ◽  
Biological Phosphorus Removal ◽  
Effluent Discharge ◽  
Under Performing

With tightening up of effluent discharge standards from wastewater treatment facilities, many plants are facing costly augmentations and in many cases completely new plants will have to be constructed. The ScanDeNi® process was developed in Sweden for increased nitrogen removal at the Västerås Sewage Treatment Plant (STP), 125,000 p.e. near Stockholm, and can be described as a modified contact stabilisation process with pre-denitrification and a selector stage for nitrification. The STP was upgraded at a cost of some 25 Mill. SEK (2.5 Mill. USD). It has been successfully in operation since 1998, exceeding all expectations. The process is showing the following major advantages.•25-35% less volume for the same Sludge Retention Time (SRT) and secondary sedimentation sludge load, compared to conventional pre-denitrification; or a 25-35% higher load can be applied within the same volume with the same removal efficiencies. • The selector mechanism appears to be not limited to the nitrifying bacteria alone. Other microorganisms appear to be responsible for the reduction of surface active matter from the return activated sludge (RAS), as well as in the reject stream from sludge dewatering, resulting in an increase in a-values of approximately 50%.•Due to the high a-values less aeration is required, resulting in significant operating cost savings.•‘Automatic’ creation of anaerobic conditions, enabling biological phosphorus removal. Whilst rarely a concern in warmer climates, BNR plants in cold climates in winter often lose their capacity to nitrify. The Västerås STP has consistently maintained excellent effluent quality even with effluent temperatures as low as 7°C, and at an SRT of some 7-9 days, proving the effectiveness of the nitrifier selector. The ScanDeNi® process could offer excellent effluent discharge standards (T-N < 10 mg/L, T-P <0.5 mg/L) in smaller tank volumes and at a significantly lower operating cost, compared to conventional pre-denitrification systems.

Foundation Design and Construction Challenges with Marsh Deposits in a High Seismic Risk Zone

2019 ◽  
Vol 13 (2) ◽  
Author(s):  
T. Ted Miyake
Keyword(s):  
Seismic Risk ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Cost Savings ◽  
Foundation Design ◽  
Dense Sand ◽  
Small Sites ◽  
Collaboration Process ◽  
Test Pile

Driven piles are ideal for supporting structures over very soft ground, especially in high seismic risk zones. Challenges include achieving sufficient vertical and lateral load capacities within the constraints of pile spacing and geologic conditions. Through a unique case study, the authors will describe the process of site exploration, foundation selection, pile design, and installation of over 3,000 concrete piles in a small 4.5-acre (1.8 hectare) site (average of one pile per 65 square feet). A state-of-the-art, $180 million plant for biosolids processing, biogas management and energy recovery was sited in marshland next to an existing sewage treatment plant. The new construction included a 70-foot (21 m) tall building and three closely spaced, 90-foot (27 m) high, 65-foot (20 m) diameter, egg-shaped steel digester tanks. The site, classified as class “F”, was underlain by up to 45 feet (14 m) of highly compressible peat and organic clays, below which was a dense sand and gravel layer. The groundwater was very shallow and site-specific seismic hazard analyses were required. Particularly challenging was achieving the needed lateral resistance to seismic loads in the very weak clay and peat deposits. The project was instructive of the importance of adequate characterization of geologic conditions even in small sites; the necessary iterative collaboration process between geotechnical and structural engineers; and the value of a well-designed indicator pile program. The test pile program allowed for refining (shortening) the design pile lengths for considerable cost savings and reduced installation time. Of interest to the reader will be the surprising depth to refusal for some areas of the site, despite the test pile program.

scholarly journals Microbiological and Toxicological Hazards in Sewage Treatment Plant Bioaerosol and Dust

Toxins ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 691
Author(s):  
Justyna Szulc ◽  
Małgorzata Okrasa ◽  
Katarzyna Majchrzycka ◽  
Michael Sulyok ◽  
Adriana Nowak ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Secondary Metabolites ◽  
Human Lung ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Settled Dust ◽  
Lung Epithelial ◽  
Sludge Thickening

Despite the awareness that work in the sewage treatment plant is associated with biological hazards, they have not been fully recognised so far. The research aims to comprehensively evaluate microbiological and toxicological hazards in the air and settled dust in workstations in a sewage treatment plant. The number of microorganisms in the air and settled dust was determined using the culture method and the diversity was evaluated using high-throughput sequencing. Endotoxin concentration was assessed with GC-MS (gas chromatography-mass spectrometry) while secondary metabolites with LC-MS/MS (liquid chromatography coupled to tandem mass spectrometry). Moreover, cytotoxicity of settled dust against a human lung epithelial lung cell line was determined with the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay and UHPLC-Q-ToF-UHRMS (ultra-high-performance liquid chromatography-quadrupole time-of-flight ultrahigh-resolution mass spectrometry) analysis was performed to determine the source of cytotoxicity. The total dust concentration in the sewage treatment plant was low and ranged from 0.030 mg m−3 to 0.044 mg m−3. The highest microbiological contamination was observed in sludge thickening building and screenings storage. Three secondary metabolites were detected in the air and sixteen in the settled dust. They were dominated by compounds typical of lichen and plants and Aspergillus, Penicillium and Fusarium genera mould. The settled dust from the sludge thickening building revealed high cytotoxicity to human lung epithelial cells A-549 (IC50 = 6.98 after 72 h). This effect can be attributed to a biocidal compound—didecyldimethylammonium chloride (DDAC-C10) and seven toxic compounds: 4-hydroxynonenal, carbofuran, cerulenin, diethylphosphate, fenpropimorph, naphthalene and onchidal. The presence of DDAC-C10 and other biocidal substances in the sewage treatment plant environment may bring negative results for biological sewage treatment and the natural environment in the future and contribute to microorganisms’ increasing antibiotics resistance. Therefore, the concentration of antibiotics, pesticides and disinfectants in sewage treatment plant workstations should be monitored.

The Analysis of The Urban Sewage Treatment Equipment Update Timing Based on Economic Life

2013 ◽  
Vol 838-841 ◽  
pp. 2561-2565
Author(s):  
Chun Jie Wang ◽  
Zhi Man Zhao ◽  
Xiao Mei Zhang
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Economic Life ◽  
Urban Wastewater ◽  
Urban Sewage ◽  
Treatment Equipment ◽  
Life Analysis ◽  
Urban Wastewater Treatment ◽  
Cost Factors

Choose an appropriate occasion for aeration equipment update, is an important problem faced by the wastewater treatment plant. This paper discussed the update of urban wastewater treatment equipment in the aeration equipment by economic life analysis methods, proposed a mathematical model and solving method of updating strategy,which is involved in a variety of cost factors and universal optimal,and is verified with examples.

One-Year Operational Data for Wiconisco Wastewater Treatment Plant Illustrating Process Improvements and Carbon Footprint Reduction with SolarBee® Circulators

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Archis Ambulkar ◽  
Stephen N. Zeller ◽  
Douglas Klinger
Keyword(s):  
Wastewater Treatment ◽  
Carbon Footprint ◽  
Wastewater Treatment Plant ◽  
Energy Savings ◽  
Treatment Plant ◽  
Electricity Consumption ◽  
Cost Savings ◽  
Residual Chlorine ◽  
Process Improvements ◽  
Carbon Footprint Reduction

In 2008, Brinjac Engineering Inc., retained municipal engineer for Wiconisco Township wastewater treatment plant (WWTP), assisted the Township with obtaining Growing Greener II Innovative Wastewater Treatment Grant Award for $84,000 to reduce treatment plant carbon footprint. With this prime objective and considering other aerators related operational issues, the plant was upgraded with new solar circulators/aerators in March'09, with one (1) solar unit installed in Lagoon # 1 and two units (2) in Lagoon # 2. Four (4) of the existing eight (8) aerators were continued to use as backup for these solar units. With these upgrades, the WWTP process changed from aerated lagoons to a system resembling towards an advanced facultative system. System performance was analyzed prior to and after upgrades. During the one (1) year of WWTP operations after upgrades (Mar'09–Feb'10 period), it was in full compliance with NPDES effluent permit. The WWTP influent data indicated that hydraulic and organic loadings remained consistent prior to and after upgrades (Jan'08–Feb'10 period). Average daily effluent BOD5 and TSS were 5.4 mg/l and 29.2 mg/l respectively before upgrades, whereas they were 6.5 mg/l and 18.6 mg/l respectively after upgrades indicating improvements in TSS removal. Average monthly fecal coliform between Jan'08–Mar'09 period was 16 mg/l (prior to upgrades) whereas it averaged at 5.5 mg/l after upgrades reflecting better coliform treatment. Other parameters including D.O., pH and residual chlorine remained within permit limits. Sludge depths in lagoons # 1 and # 2 decreased by approx. 2.50 ft and 0.50 ft respectively after upgrades. In 2009, the SolarBee® units reduced algae sufficient enough that no biological additives were needed for its control, resulting in an annual saving of more than $5,000. Apart from process improvements, monthly electricity consumption and electric bills at WWTP decreased by about 47% and 32% respectively after upgrades. Some additional cost savings were compensated due to increase in unit electric costs. During Jan'08–Feb'10 period, Chapter 94 Reports did not indicate for any significant modifications at WWTP other than Solar system upgrades that would result in major changes to electricity consumption. Hence, energy savings were considered to be directly related to these upgrades. With energy savings, carbon footprint of WWTP decreased by 47%. Process improvements at the WWTP were consistent with experiences from previous case studies. Overall, solar units provided efficient circulation and mixing in lagoons while maintaining aerobic conditions necessary for treatment and served as a suitable option for process improvements, minimizing energy costs, carbon footprint reduction and meeting permit limits.

Analysis and balance of phosphorous removal from wastewater at urban wastewater treatment plant

2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Recovery ◽  
Anaerobic Sludge ◽  
Biological Phosphorus Removal ◽  
The Mean

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operation

2008 ◽  
Vol 37 (2) ◽  
Author(s):  
Maciej Walczak
Keyword(s):  
Water Quality ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sewage Treatment Plants ◽  
Plant Operation ◽  
Treated Sewage ◽  
Microbiological Parameters ◽  
Microbial Indices

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operationThis paper reports the results of studies of microbiological changes in the water quality of the Vistula and Brda rivers after the opening of sewage treatment plants in Bydgoszcz. The study involved determining the microbiological parameters of water quality. Based on the results obtained, it was found that the quality of the water in both rivers had improved decidedly after the opening of the plants, although an increased number of individual groups of microorganisms was found at the treated sewage outlet from one of the plants.

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