scholarly journals Evolution of Floatation Equipment for Sewage Treatment аnd Active Sludge Thickening

10.12737/6025 ◽  
2014 ◽  
Vol 3 (5) ◽  
pp. 58-73
Author(s):  
Сеник ◽  
E. Senik ◽  
Иванов ◽  
M. Ivanov ◽  
Виноградов ◽  
...  
Keyword(s):  
Sewage Treatment ◽  
Experimental Methods ◽  
Wastewater Sludge ◽  
Multistage Process ◽  
Active Sludge ◽  
High Effectiveness ◽  
Chemical Agents ◽  
Definition Of ◽  
Sludge Thickening ◽  
Floatation Process

The article covers theoretical basics of floatation process and main stages of flotators’ evolution. special attention is paid to flotation as multistage process as well as to definition of constants with theoretical and the experimental methods. Authors demonstrate that use of theoretical bases of multistage flotation model allows to significantly stimulating floatation process. Leading foreign and domestic innovations in floatation sewage treatment and active sludge thickening are presented. Promising research in constructing multi-tool floatation apparatus (flotation combine) is described. The article provides variants of multi-tool flotators’ design, examples of its integration into operation, and the test data confirming its high effectiveness for sewage treatment and active sludge thickening. Methods of stimulating thickening with carbon dioxide and chemical agents are used for wastewater sludge (including active sludge).

Destruction of Faecal Bacteria, Enteroviruses and OVA of Parasites in Wastewater Sludge by Aerobic Thermophilic and Anaerobic Mesophilic Digestion

1991 ◽  
Vol 24 (2) ◽  
pp. 377-380 ◽  
Author(s):  
E. G. Carrington ◽  
E. B. Pike ◽  
D. Auty ◽  
R. Morris
Keyword(s):  
Sewage Treatment ◽  
Treatment Plant ◽  
Wastewater Sludge ◽  
Sludge Treatment ◽  
Volatile Solids ◽  
Working Volume ◽  
Thermotolerant Coliforms ◽  
Mesophilic Digestion ◽  
Faecal Bacteria ◽  
Faecal Streptococci

A new sludge treatment plant at Harrogate South Sewage Treatment Works is designed to handle up to 4 tonnes (dry solids) daily. Sludge is thickened continuously up to 8% (ds) and is then treated in parallel anaerobic mesophilic (AD) and thermophilic aerobic digestion (TAD) plants each with a maximum working volume of 530m3. Microbiological studies were carried out to compare the destruction of pathogens and faecal indicator bacteria. The AD plant operated with a mean retention of 26 days at 34 °C and achieved 49% reduction of volatile solids. The TAD plant operated with a mean retention of 28 days at 55 °C and reduced volatile solids by 35%. Operation was on a pump in-pump out cycle, guaranteeing 4h retention for all sludge. The disinfecting ability of TAD exceeded that of AD since it reduced counts of Enterobacteriaceae, thermotolerant coliforms and faecal streptococci to below 103/100ml, rendered cytopathic enteroviruses undetectable and destroyed viability of Ascaris suum ova within 4h. The AD process reduced bacterial counts by 90% and enteroviruses by 99%, but has no effect upon viability of Ascaris ova.

INPROVEMENT OF INDUSTRIAL WASTES CLEARING ON BIOLOGICAL TREATMENT PLANTS

2014 ◽  
Vol 4 (2) ◽  
pp. 42-48
Author(s):  
Alexander Viktorovich ANTSIFEROV ◽  
Vladimir Mikhaylovich FILENKOV
Keyword(s):  
Industrial Waste ◽  
Biological Treatment ◽  
Sewage Treatment ◽  
Industrial Wastes ◽  
Biological Wastewater Treatment ◽  
Industrial Waste Water ◽  
Active Sludge ◽  
Effi Ciency ◽  
Prokaryotic Microorganisms ◽  
Selection Of

The aim of this research is the selection of the consortium in aerobic conditions with the help of active sludge, enriched the culture of prokaryotic microorganisms, for increase of degree of biological wastewater treatment. The dependence of the viability of microorganisms in case of emergency discharges of industrial waste water is presented. The comparative analysis of the effi ciency of sewage treatment with usual and enriched active sludge is done.

scholarly journals Investigation of hydraulic fitting losses

2018 ◽  
Vol 168 ◽  
pp. 02011 ◽  
Author(s):  
Marian Bojko ◽  
Milada Kozubková
Keyword(s):  
Flow Direction ◽  
Experimental Methods ◽  
Numerical Approach ◽  
Model Verification ◽  
Hydraulic Systems ◽  
Mathematical Methods ◽  
Standards And Regulations ◽  
Definition Of ◽  
Resistance Coefficients

Fluid flow in hydraulic systems, fittings, and piping causes hydraulic losses due to the change of flow direction and friction in the fluid. The main consequence of the resulting losses is the increase in the overall pressure gradient of the circuit. The paper is focused on the investigation of valve losses and the determination of resistance coefficients, the definition of which depends on the valve type. Methods of determination are of two types, i.e. experimental methods and mathematical methods. In the case of experimental methods, the procedures prescribed by the standards and regulations must be respected. Mathematical methods are related to defining an appropriate mathematical model and numerical approach. Both methods are applied to the ball valve and model verification is performed at the same time. The output of the thesis is the methodology for determination of resistance coefficients of valves with other diameters and other flowing media based on verified mathematical modeling.

scholarly journals INFLUENCE OF CHLORIDES AND SULPHATES ON QUALITY OF BIOLOGICAL WASTEWATER TREATMENT USING ENZYME PREPARATIONS

2004 ◽  
Vol 12 (3) ◽  
pp. 91-95 ◽  
Author(s):  
Audra Skaisgiriene ◽  
Pertas Vaitiekūnas ◽  
Vytenis Zabukas
Keyword(s):  
Biological Treatment ◽  
High Efficiency ◽  
Low Cost ◽  
Energy Levels ◽  
Sewage Treatment ◽  
Treatment Method ◽  
Active Sludge ◽  
Enzyme Preparations ◽  
Biochemical Oxygen Consumption

The biological treatment method is widely used in Lithuania due to its high efficiency, low cost and suitability for treating various types of wastewater. After technological processes various mineral substances, such as chlorides and sulphates, get into water bodies. These substances are not removed from wastewater by the biological treatment method. The purpose of this study is to determine the concentrations of chlorides and sulphates, investigate the influence of enzyme preparations upon quality and energy consumption and assess energy changes in the trophic food chain during biological treatment. To analyse the mineral salt influence of the biooxidation process a series of laboratory tests was carried out: biochemical oxygen consumption (BOD), activated sludge concentration and other indexes. It is found experimentally that a 400 mg/1 concentration of chlorides disarranges the activity of microorganisms, and at a 700 mg/1 concentration active sludge is no longer suitable for biological treatment. Also, we investigated the effect of a ferment preparation “Roebic” on effluence of sewage treatment. In a tank with an enzyme the total amount of energy after treatment increases by 5–30 %. It is determined by calculating the accumulation of energy in an active‐sludge system that an enzyme preparation increases the energy levels of the system.

scholarly journals New trends on yeast autolysis and wine ageing on lees: a bibliographic review

OENO One ◽  
2002 ◽  
Vol 36 (2) ◽  
pp. 49 ◽  
Author(s):  
Caroline Fornairon-Bonnefond ◽  
Carole Camarasa ◽  
Michel Moutounet ◽  
Jean-Michel Salmon
Keyword(s):  
Experimental Methods ◽  
Point Of View ◽  
Red Wines ◽  
Organic Residues ◽  
Yeast Autolysis ◽  
Definition Of ◽  
Effects Of Aging ◽  
Ageing On Lees ◽  
Experimental Stage ◽  
Wine Ageing

<p style="text-align: justify;">In enology, «grands crus» white wines are traditionally aged by the «sur lies» method, which consists of keeping the aging wine in contact with the lees (yeasts and organic residues). The lees can come either from the first or second fermentation and can be used for both white and red wines. This practice is still in the experimental stage. We reviewed scientific studies carried out on wine lees to determine the current situation in enology. We also provide some technological information relevant to such a practice.</p><p style="text-align: justify;">The first part of this paper provides a clear definition of wine lees from a legal and technological point of view. The second part describes the mechanisms of autolysis and focuses on each class of autolysis product. Many scientific studies have discussed the phenomenon of yeast autolysis during wine ageing. Most of these studies simply identified the yeast macromolecules released into the wine during autolysis. However, the experimental methods used vary and it is difficult to extrapolate most of results to the process of wine ageing on lees. Only a few studies have dealt with the physicochemical properties of lees during autolysis, especially concerning oxygen, polyphenols and other wine compounds. We then summarize the recent data obtained on these topics. Finally, we discuss the technical effects of aging wine on lees.</p>

scholarly journals Hydraulic Design of Sewage Treatment Plant for Junagadh Agricultural University Campus

2018 ◽  
Vol 13 (3) ◽  
pp. 472-480
Author(s):  
RAM VAIBHAV M ◽  
MAKWANA AJAY D. ◽  
D. S. THANKI
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Research Field ◽  
University Campus ◽  
New Schools ◽  
Recycled Water ◽  
Active Sludge ◽  
Hydraulic Design ◽  
Sludge Drying

The Junagadh Agricultural University campus is located in Junagadh, which lies in western Gujarat. The human population on the campus is multiplied distinctively due to the establishment of new schools and hostels.The university campus had a population of 1418 in the year 2013 when the supply of water was 152 lit/day per person and the sewage generation was 0.0084 m3/s (725.76 m3/day).Hence, a sewage treatment plant (STP) with suitable capacity is needed to deal with the elevated sewage. The recycled water can be utilized for agricultural purposes. This paper discusses about the design of STP and its major components such as skimming, grit chamber, and screening chamber, active sludge, sedimentation tank and secondary clarifier in the end sludge drying beds. The proposed design is suitable for 0.0672 m3/s sewage and would help to provide58 MLD process capacity. In the end, treated water will have been used for irrigation purpose in the research field of a university.

Disinfection, Recontamination and Regrowth of Indicator Bacteria in a Wastewater Sludge Heat Treatment System

1988 ◽  
Vol 20 (11-12) ◽  
pp. 329-335
Author(s):  
Roger S. Fujioka ◽  
Wesley M. Hirano ◽  
Philip C. Loh
Keyword(s):  
Heat Treatment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Wastewater Sludge ◽  
Indicator Bacteria ◽  
Primary Sludge ◽  
Heat Treated ◽  
Sludge Cake ◽  
High Concentrations

The largest sewage treatment plant in Hawaii produces 25,400 kg/day of primary sludge that is heat-treated (190°C) under 330 psig for 3 0 min. Although this treatment should result in a sterilized sludge product, the final sludge cake often contains high concentrations of fecal-borne indicator bacteria. The heat-treatment process was shown to disinfect the sludge of indicator bacteria. However, post contamination of the heat-treated sludge by raw sludge and by chlorinated primary effluent and the regrowth of indicator bacteria in the sludge storage tanks resulted in the presence of indicator bacteria in the sludge cake.

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.

Determination of Wastewater Accidental Contamination by Antibiotics

2019 ◽  
Vol 7 (5) ◽  
pp. 3-8
Author(s):  
В. Алексеев ◽  
V. Alekseev ◽  
В. Усольцев ◽  
V. Usol'cev ◽  
С. Юран ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Direct Method ◽  
A Priori ◽  
Sewage Treatment ◽  
Control Procedure ◽  
Real Time Control ◽  
Short Period ◽  
Quantitative Characteristics ◽  
Definition Of

The way for solving the task of enterprises sewage treatment from emergency discharge of antibiotics is offered. Emergency discharge of antibiotics into sewage can arise at enterprises of chemical-pharmaceutical and processing industry. Emergency discharge happens in a short period that gives the chance for its detection and utilization into a settler. Standards for emergency discharges have been presented. The main form for detection of antibiotics in water, their kind and concentration identification is analysis of flowing sewage. This analysis includes two elements: obtaining information on the actual existence of antibiotics (their qualitative and quantitative characteristics), and comparison of obtained information with available indicators for the purpose of definition of their compliance. The control procedure includes operations of measurement and identification. Determination of numerical values for indicators of quantitative characteristics is based on information obtained when using technical means of measurements. For the task solution have been considered characteristics of various methods for detection of antibiotics in sewage. Classification of methods according to quantitative and qualitative indicators of sewage on antibiotics existence has been carried out. Have been allocated methods providing the real time control, among which a specific place is occupied by optical-electronic control methods with use of laser radiation. For implementation of real spectroscopy it is offered to use laser radiation with radiation wavelength corresponding to antibiotic range extremes. In such a case, a spectral characteristic of an antibiotic, which can appear in emergency discharge of enterprise’s sewer, is a priori known. For verification of this technical offer an experiment was set up, which had showed a possibility to use a direct method of spectroscopy — translucency on laser radiation’s chosen wavelength for definition of emergency discharge of antibiotic into enterprise’s sewage.

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