Application of dispersion modelling to odour assessment: a practical tool or a complex trap?

2000 ◽  
Vol 41 (6) ◽  
pp. 81-88 ◽  
Author(s):  
A. McIntyre
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Control Measures ◽  
Dispersion Modelling ◽  
Modelling Techniques ◽  
Treatment Facilities ◽  
Practical Tool ◽  
Odour Control ◽  
The Individual ◽  
Odour Annoyance

The use of modelling techniques for predicting the dispersion of odours from wastewater treatment plants is considered in relation to both the resolution of odour problems and the design requirements for new facilities. The issues of community odour annoyance and nuisance are discussed in the context of modelling averaging times, short-term odour peaks and the nature of the individual odours. In addition, the derivation of acceptable odour annoyance criteria is discussed with a comparison of different international approaches and a practical approach to resolving design criteria is proposed. Four case studies include the analysis and resolution of severe odour problems at two major wastewater treatment facilities and the evaluation of “Cordons Sanitaire” in the planning of new housing developments. In the first two cases, modelling was used to identify the most significant processes in terms of off-site effects and then to assess the required abatement level to achieve an acceptable complaints frequency. Inthe third case, dispersion modelling was used to assess the effectiveness of planned odour control measures in the release of land for residential development. The fourth case study demonstrates how an overly-stringent approach to odour control can cause problems.

Biological odour control by diffusion into activated sludge basins

2000 ◽  
Vol 41 (6) ◽  
pp. 127-132 ◽  
Author(s):  
R. P. Bowker
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
High Strength ◽  
Air Stream ◽  
Fine Bubble ◽  
Treatment Facilities ◽  
Odour Control ◽  
Odour Emissions ◽  
Air Streams

Diffusion of odourous air into activated sludge basins is an effective and economical approach for odour control at wastewater treatment plants. Over 30 facilities in North America practice this technique. Most of these applications are for dilute or moderate strength air streams with relatively low hydrogen sulfide (H2S) levels. Unfortunately, the lack of data documenting the effectiveness of the process and concerns for blower corrosion have limited its acceptance as a method for controlling odour emissions. This paper presents a compilation and review of wastewater treatment facilities that are currently using activated sludge diffusion. Performance data are tabulated, and information on operation and maintenance of the blower/diffuser systems are summarized. New data are presented that compare the effectiveness of coarse vs. fine bubble diffusers for treatment of a high strength, high-H2S air stream from sludge holding tanks at Concord, NH. Designand performance information is presented on a dedicated odour control system installed at Phoenixville, Pennsylvania in 1996 that collects high-H2S air streams from an influent chamber and primary clarifiers and diffuses it into a mechanically-aerated activated sludge basin. A cost-effectiveness analysis is presented for a blower/diffuser system installed exclusively for odour control. Methods used to overcome initial operational problems are discussed.

Assessment of the microbial toxicity test and its application for industrial wastewaters

1997 ◽  
Vol 36 (12) ◽  
pp. 375-382 ◽  
Author(s):  
Chiu-Yang Chen ◽  
Jau-Bin Huang ◽  
Shing-Der Chen
Keyword(s):  
Wastewater Treatment ◽  
High Intensity ◽  
Aldehyde Group ◽  
Waste Reduction ◽  
Individual Response ◽  
Microbial Toxicity ◽  
Treatment Facilities ◽  
Specific Oxygen Uptake Rate ◽  
The Individual ◽  
The Relationship

In this study, two microbial bioassays, i.e. the commercialized Microtox® test and the specific oxygen uptake rate (SOUR) method, are used to assess the individual response of existing wastewater treatment facilities in several high-intensity pollution industries. Initially, the microbial toxicity of manufacturing effluents from a petrochemical industry are assessed. The toxicant sources in the manufacturing effluents are then investigated to develop the baseline of the waste reduction in the manufacturing processes. According to these results, the amount of aldehyde group contributes the majority of the microbial toxicity in the wastewater. Therefore, the abatement of the aldehyde wastewater may be the most effective factor to release the loads for following wastewater treatment facilities. To control the discharge sources to the treatment facilities (WWTP), WWTPs with high-intensity pollution industries and public WWTPs in three industrial districts are further evaluated with their effluents to determine the primary contributor of toxicants. From the effluent toxicity results, the relationship between organic loads and toxic effluents exhibits a positive conjunction in the high-intensity pollution industries. If these industries can enhance their removal efficiency of organic compounds in the pretreatment system, the toxicity of their effluents can be effectively reduced. Consequently, the following treatment facilities can perform more efficiently to satisfy their needs.

scholarly journals Antibiotic resistance in European wastewater treatment plants mirrors the pattern of clinical antibiotic resistance prevalence

2019 ◽  
Vol 5 (3) ◽  
pp. eaau9124 ◽  
Author(s):  
Katariina M. M. Pärnänen ◽  
Carlos Narciso-da-Rocha ◽  
David Kneis ◽  
Thomas U. Berendonk ◽  
Damiano Cacace ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Action Plan ◽  
Quantitative Polymerase Chain Reaction ◽  
Antibiotic Use ◽  
Control Measures ◽  
World Health ◽  
Global Action ◽  
Health Organization

Integrated antibiotic resistance (AR) surveillance is one of the objectives of the World Health Organization global action plan on antimicrobial resistance. Urban wastewater treatment plants (UWTPs) are among the most important receptors and sources of environmental AR. On the basis of the consistent observation of an increasing north-to-south clinical AR prevalence in Europe, this study compared the influent and final effluent of 12 UWTPs located in seven countries (Portugal, Spain, Ireland, Cyprus, Germany, Finland, and Norway). Using highly parallel quantitative polymerase chain reaction, we analyzed 229 resistance genes and 25 mobile genetic elements. This first trans-Europe surveillance showed that UWTP AR profiles mirror the AR gradient observed in clinics. Antibiotic use, environmental temperature, and UWTP size were important factors related with resistance persistence and spread in the environment. These results highlight the need to implement regular surveillance and control measures, which may need to be appropriate for the geographic regions.

scholarly journals Estimating the costs of collective treatment of wastewater: the case of Walloon Region (Belgium)

2010 ◽  
Vol 62 (3) ◽  
pp. 640-648 ◽  
Author(s):  
Thomas Dogot ◽  
Yanni Xanthoulis ◽  
Nathalie Fonder ◽  
Dimitri Xanthoulis
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Integrated Approach ◽  
Decision Makers ◽  
Large Set ◽  
Strategic Choices ◽  
Unit Costs ◽  
Treatment Facilities ◽  
Walloon Region

This paper contributes to a better understanding of costs for collective wastewater treatment in the Walloon Region (Belgium). Based on a large set of data, unit costs to population equivalents are modelled. Considering investment as well as exploitation costs, the model includes not only wastewater treatment plants but also collector and sewage networks in an integrated approach at the technical basin level. Beyond this modelling, each type of process is analyzed independently in order to explore the structure of investment costs and their variation factors. Then, the model was used to forecast the upcoming expenses for 36 areas which are not yet equipped with collective wastewater treatment facilities. In light of these results, strategic choices for decision makers are discussed.

Development of a Practical Tool for the Assessment of Biological Performances in Wastewater Treatment Plants

2016 ◽  
Vol 44 (11) ◽  
pp. 1435-1443 ◽  
Author(s):  
Francesca F. Malinverni ◽  
Giuseppe Genon ◽  
Barbara Ruffino
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Practical Tool

scholarly journals The biomass, survival, reproductive and biomarker responses of Helix pomatia to soil contaminated with treated and untreated wastewater.

2021 ◽  
Author(s):  
Semase Matseleng ◽  
Ozekeke Ogbeide ◽  
Patricks' Otomo Voua
Keyword(s):  
Wastewater Treatment ◽  
Egg Production ◽  
Wastewater Treatment Plants ◽  
Helix Pomatia ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Invertebrate Fauna ◽  
Untreated Wastewater ◽  
Industrial Town ◽  
Treatment Facilities

Abstract Wastewater treatment facilities in developing countries like South Africa are major sources of contaminants via effluent into the environment, which could portend high toxicity risks for non-target flora and fauna. To this end, a study was conducted to determine the ecotoxicological responses of selected organism to treated and untreated wastewater from the wastewater treatment plants in an industrial town. The snail Helix pomatia was exposed to OECD artificial soil spiked with untreated or treated wastewater at the following concentrations: 0, 25, 50, 75, 100%. The ecotoxicological responses of Helix pomatia to wastewater were determined by assessing the biomass, survival, reproduction and biomarker responses (Catalase ‒ CAT and Acetylcholinesterase ‒ AChE activities). The overall results showed significant effects on the survival, reproduction and biomass of H. pomatia. Similar results were observed for juvenile emergence. An EC50 of 5.751% for egg production and an EC50 of 6.233% for juvenile emergence were determined in the untreated wastewater. Such indices could not be computed for the treated wastewater, indicating a decreased in toxicity between the untreated and the treated samples. For both the AChE and CAT activities, there was no statistical difference between treated and untreated wastewater treatments. The results from this study highlight the toxic effects of untreated wastewater and indicate that treated wastewater (effluent) released from the wastewater treatment plant in Phuthaditjhaba remains suitable for invertebrate fauna such as H. pomatia.

Automation of a Petroleum Refinery Wastewater Treatment Plant:A Case Study

1989 ◽  
Vol 24 (3) ◽  
pp. 451-462
Author(s):  
Robert J. Shantz ◽  
Virginia B. Erickson
Keyword(s):  
Wastewater Treatment ◽  
Control System ◽  
Wastewater Treatment Plants ◽  
Computer Control ◽  
Treatment Plant ◽  
Oil Refinery ◽  
Operating Costs ◽  
Computer Control System ◽  
Treatment Facilities ◽  
Labor Requirements

Abstract Historically, automation was not considered for wastewater treatment plants because it did not significantly affect operating costs, and manual plant operation was considered acceptable. Despite past practices, the BP Oil Refinery at Marcus Hook, Pennsylvania set a new standard when they began upgrading their wastewater facility in 1985. By automating the plant, they ensured safe, reliable operation with minimum labor requirements, process optimization, and long-term reductions in operating costs. Major design features included: a distributed computer control system with monitoring and supervisory capabilities; high-quality control system instruments; control system components; and redundancy and backup to support operation if a component or power failure occurs. In addition, design control philosophies remained consistent from predesign to startup. This advanced wastewater treatment plant can serve as a model for automation of future industrial treatment facilities.

Toxicity assessment of industrial wastewater by microbial testing method

1999 ◽  
Vol 39 (10-11) ◽  
pp. 139-143 ◽  
Author(s):  
Chiu-Yang Chen ◽  
Jun-Nen Chen ◽  
Shing-Der Chen
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Operating Performance ◽  
Toxicity Assessment ◽  
Industrial Districts ◽  
Individual Response ◽  
Testing Method ◽  
Treatment Facilities ◽  
The Individual ◽  
The Relationship

In this study the commercial Microtox® test is used to assess the individual response of existing wastewater pretreatment facilities in several high-intensive pollution industries. To control the discharge sources to the wastewater treatment facilities (WWTP), public WWTP with high-intensive pollution industries in three industrial districts are evaluated with their influents to determine the primary contributor of toxicants. From the tested toxicity results, the relationship between organic loads and toxic discharges exhibits a positive conjunction in the high-intensive pollution industries. If these industries can enhance their operating performance in the pretreatment system, the toxicity of their discharges can be effectively reduced.

A procedure for estimating the capital cost of Ontario wastewater treatment plant using CAPDET

1988 ◽  
Vol 15 (5) ◽  
pp. 799-806 ◽  
Author(s):  
David G. Wright ◽  
Gilles G. Patry ◽  
Charles E. Letman ◽  
Donald R. Woods
Keyword(s):  
Wastewater Treatment ◽  
Cost Estimation ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Construction Cost ◽  
Capital Cost ◽  
Specific Design ◽  
Cost Estimates ◽  
Unit Costs ◽  
Treatment Facilities

CAPDET is a computer-assisted procedure for the design and evaluation of wastewater treatment facilities developed by the U.S. Army Corps of Engineers and the U.S. Environmental Protection Agency. The purpose of this study was to develop a procedure for applying CAPDET to the capital cost estimation of Canadian wastewater treatment plants without altering the source code. The proposed methodology is simple and efficient, requiring no additional data to that normally used in CAPDET.A total of 10 Canadian wastewater treatment plants were studied which included many of the treatment processes used in Canada. Six plants were used to develop the procedure while four plants were used to verify the procedure. The design flow for the selected plants ranged between 550 and 13 600 m3/d. Construction cost estimates generated using site-specific design information were compared with those obtained using the default database provided in CAPDET. The importance of the various unit costs on the total plant cost was also determined.Under the proposed methodology, unit costs are first adjusted to the date of construction using appropriate inflation indices. Wall concrete, slab concrete, and excavation costs are increased by an additional 15, 50, and 25%, respectively, to account for differences in construction practice. A final estimate reduction of 15% is performed to account for Canadian conditions.The procedure provides construction cost estimates that are within ± 20% of actual construction costs with a mean absolute error of 11% and an average error of 2.3%. Site-specific design data had little effect on the construction cost estimates with the exception of lagoon treatment facilities. Utilities and support facilities accounted for 20–30% of the cost estimates. The most significant cost parameters were the inflation index values and concrete and building unit costs. Key words: capital cost, construction cost estimation, wastewater treatment plant, mathematical modelling, calibration, verification.

scholarly journals Occurrence and reduction of F-specific RNA bacteriophage genotypes as indicators of human norovirus at a wastewater treatment plant

2018 ◽  
Vol 17 (1) ◽  
pp. 50-62 ◽  
Author(s):  
Suntae Lee ◽  
Mamoru Suwa ◽  
Hiroyuki Shigemura
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Case Scenario ◽  
Worst Case ◽  
Mean Values ◽  
Treatment Facilities ◽  
The Mean ◽  
Human Enteric Viruses ◽  
The Relationship

Abstract F-specific RNA bacteriophages (FRNAPHs) have been suggested as good indicators of the presence of human enteric viruses in water treatment facilities. The occurrence and reduction of norovirus (NoV) and FRNAPH genotypes in wastewater treatment plants (WWTPs) have been well studied; however, the relationship between these genotypes in WWTPs has not been fully elucidated. Thus, we aimed to investigate the occurrence and reduction of FRNAPH genotypes in an attempt to identify NoV indicators in a WWTP via a 1-year survey. All FRNAPH and NoV genotypes were detected in WWTP influents at high rates (71–100%), including the infectious FRNAPH genotype IV (GIV), which has been rarely detected in previous studies. The reductions of FRNAPH GII and NoV GII during wastewater treatment indicated a relationship between the two (r = 0.69, P < 0.01), and the mean values were not significantly different. These results suggested that FRNAPH GII could be used as an appropriate indicator of NoV GII during wastewater treatment. FRNAPH GI was also found to be an appropriate indicator of viral reduction because of its high resistance to wastewater treatment compared with the other FRNAPH and NoV genotypes; therefore, it can be considered as a worst-case scenario organism.

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