French Experience in the Operation and Maintenance of Wastewater Treatment Lagoons

1987 ◽  
Vol 19 (12) ◽  
pp. 333-335
Author(s):  
M. Vuillot ◽  
C. Boutin ◽  
M. F. Dupuis
Keyword(s):  
Wastewater Treatment ◽  
General Survey ◽  
Operation And Maintenance ◽  
French Experience ◽  
Local Operators ◽  
Maintenance Requirements

A general survey of maintenance requirements and problems of wastewater lagoons has been conducted in France with a view to preparing an operation manual for plant owners and local operators. An outline of the pond maintenance situation in France is given, and the main information and recommendations contained in the manual are presented in this paper.

Experience Concerning 1200-psi Naval Steam Generators

1969 ◽  
Vol 6 (03) ◽  
pp. 254-267
Author(s):  
J. E. Kaune ◽  
W. A. Fritz
Keyword(s):  
Training Program ◽  
Optimum Design ◽  
Steam Generators ◽  
Auxiliary Equipment ◽  
Operation And Maintenance ◽  
Naval Ship ◽  
Boiler Operation ◽  
New Type ◽  
Extensive Program ◽  
Maintenance Requirements

At a meeting held in the Naval Ship Engineering Center, Philadelphia Division, in January and February 1967, the following were found to be the principal reasons for the 1200-psi-boiler problems:Introduction of a new type of boiler without a sufficient training program;lack of a sufficient supply parts backup;lack of adequate manuals and documentation;lack of sufficient auxiliary equipment to assist in boiler operation and maintenance, and lack of optimum design features. This paper describes the aforementioned problems and what has been and is being done to improve conditions. An extensive program is now underway to vastly improve overall boiler reliability and decrease maintenance requirements.

Determination of the Maintenance Requirements of Activated Sludge

1993 ◽  
Vol 28 (7) ◽  
pp. 139-142 ◽  
Author(s):  
J. Chang ◽  
P. Chudoba ◽  
B. Capdeville
Keyword(s):  
Wastewater Treatment ◽  
Process Development ◽  
Biomass Concentration ◽  
Growth Yield ◽  
Kinetic Studies ◽  
Initial Biomass Concentration ◽  
Aerobic Wastewater Treatment ◽  
Initial Substrate ◽  
Maintenance Requirements ◽  
The Cost

Maintenance energy plays an important role both in basic kinetic studies and in process development. Numerous studies have been devoted to the maintenance concept in various microbial fields but very few in biological wastewater treatment. Using a fermenter coupled to a mass spectrometer, we investigated the influence of the ratio So/Xo (ratio between initial substrate concentration and initial biomass concentration) on the observed sludge growth yield of an oxic-settling anaerobic (OSA) system. By measuring the substrate removed, the oxygen consumed and the carbon dioxide produced, we were able to estimate the substrate fraction used for maintenance purposes. The results indicate that at a high So/Xo ratio, a greater proportion of the substrate is devoted to maintenance thus significantly decreasing the observed growth yield. These findings are of particular importance in view of the cost associated with the disposal of excess sludge in aerobic wastewater treatment processes.

Study on the Maintenance and Management of VRLA Battery

2014 ◽  
Vol 644-650 ◽  
pp. 3902-3905
Author(s):  
Wen Cui Li ◽  
Yi Yang ◽  
Hao Zhang ◽  
Jing Xian Lv ◽  
Xin Jian Shu
Keyword(s):  
Test Methods ◽  
Processing Method ◽  
Control Measures ◽  
Lead Acid Battery ◽  
Operation And Maintenance ◽  
Basic Characteristics ◽  
Maintenance Requirements ◽  
Vrla Battery ◽  
Charge Discharge ◽  
Discharge Test

The paper introduced the basic characteristics, maintenance requirements and backward cell processing method of Valve Regulated Lead Acid Battery (VRLA) based on the practice of substation communication, elaborated the charge-discharge test battery requirements. This paper discussed the test of battery operation and maintenance, charge and discharge risk. Through the test methods of battery communication charging and discharging and the steps of analysis, we find out the possible dangerous points in processing of charging and discharging, and at the same time, we list the typical examples on safety risk and carry on the analysis on accident cause to put forward the pre-control measures.

Fully Biological Wastewater Treatment without Energy Consumption

1990 ◽  
Vol 22 (3-4) ◽  
pp. 331-334
Author(s):  
L. Csépai
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Longitudinal Section ◽  
Biological Wastewater Treatment ◽  
External Energy ◽  
Trickling Filters ◽  
Purification Efficiency ◽  
Maintenance Requirements

By two Sewage Treatment Plants it is demonstrated that a fully biological wastewater treatment without external energy supply is possible provided there is a sufficient natural gradient to guarantee a free flow through the entire plant. Both plants have now been in operation for more than 2 years. Test results show a very good purification efficiency. Elimination of BOD5 is over 93%, of COD 84%, of TOC 86%, of NH4 66 % and that of nitrogen totals 29%. The results of the two-year operation of both plants prove that also smaller units allow for meeting all requirements to obtain a good purification efficiency. Especially pre-settling and final clarifying ponds with interposed trickling filters represent a very simple but economic addition to the ample variety of modern wastewater techniques. It has also been demonstrated that, when planning wastewater treatment plants, every effort should be made to adjust the hydraulic longitudinal section to the existing area conditions, even at the risk of increased building costs. As far as economic considerations are concerned, a unit operating without energy consumption certainly proves advantageous. At the same time it offers a running guarantee, which is equally important, especially in case of smaller units. Particularly if local communities experience prolonged economic difficulties such considerations gain increasing priority. In addition to all these advantages the plants show a high buffering efficiency, minimum maintenance requirements and very low running costs.

Operation and Maintenance Requirements for a Large Diameter, Deep CSO Tunnel System

2018 ◽  
Vol 2018 (17) ◽  
pp. 559-567
Author(s):  
Monica Outland ◽  
Carlton Ray ◽  
Gordon Evans ◽  
Ramakrishna Jeedigunta
Keyword(s):  
Large Diameter ◽  
Operation And Maintenance ◽  
Maintenance Requirements ◽  
Tunnel System

A hybrid method for matching analysis of construction project characteristics with operation and maintenance requirements

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guofeng Ma ◽  
Zhijiang Wu ◽  
Ming Wu ◽  
Shanshan Shang
Keyword(s):  
Construction Project ◽  
Influential Factors ◽  
Order Parameters ◽  
Content Type ◽  
Operation And Maintenance ◽  
Maintenance Stage ◽  
Project Characteristics ◽  
Correlation Strength ◽  
Maintenance Requirements ◽  
The Cost

PurposeThe purpose of this study is to extract the real requirements of the owner (or users) for the construction project in the operation and maintenance stage completely and accurately and carry out the construction based on the requirements, to make the project status and operation and maintenance requirements (RO&M) consistent after delivered.Design/methodology/approachThis study creatively proposes the operation and maintenance functions deployment (OMFD) under RO&M. In addition, the OPAR (naming is made up of the initials of owners, project, analysis and result) model is constructed to fully identify the requirements of both owners and projects. In this study, three typical construction projects are taken as examples to calculate the correlation strength between project characteristics (PC) and operation and maintenance requirements through the Apriori algorithm, and order parameters are obtained from the cost chain.FindingsThis study found that there are significant differences in the correlation strength between 11 types of RO&M and PC, in which the “cost of types” (TC) correlation of residential housing and factory buildings is the largest, while the largest correlation demand of commercial buildings is “safety of types” (TS) and “system” (S). Simultaneously, through the calculation of order parameters, the most influential factors on project characteristics are obtained.Practical implicationsThis study could effectively help the owner (or users) to check whether the delivered project fully satisfy their real requirements and also extract the key technical points to realize RO&M, which can guide the accurate construction of the same type of projects.Originality/valueThis research establishes OPAR model to accurately identify the requirements of the project in the operation and maintenance stage and establishes the association rules between the requirements and the construction scheme, which is helpful for the project to construct under the expected requirements.

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