Variability control: key to regulatory compliance and sustainability goals

2006 ◽  
Vol 53 (11) ◽  
pp. 1-9 ◽  
Author(s):  
A.J. Englande ◽  
W.W. Eckenfelder ◽  
G. Jin
Keyword(s):  
Wastewater Treatment ◽  
Waste Treatment ◽  
Management Practice ◽  
Regulatory Compliance ◽  
Process Technology ◽  
Effluent Quality ◽  
Best Management ◽  
Performance Variability ◽  
Treatment Technologies ◽  
Biological Waste Treatment

The focus of this paper is on variability concerns in wastewater treatment and approaches to control unacceptable fluctuations in effluent quality. Areas considered include: factors contributing to variability in both waste loads and process technology performance; variability assessment; control of variability employing the process best management practice (BMP); design/operation of biological waste treatment technologies for variability reduction; and modelling to enhance process control.

Performance evaluation of different wastewater treatment technologies operating in a developing country

2011 ◽  
Vol 1 (1) ◽  
pp. 37-56 ◽  
Author(s):  
Sílvia C. Oliveira ◽  
Marcos von Sperling
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Septic Tank ◽  
Operational Parameters ◽  
Technical Literature ◽  
Effluent Quality ◽  
Loading Rates ◽  
Treatment Processes ◽  
Treatment Technologies ◽  
Uasb Reactors

This article analyses the performance of 166 wastewater treatment plants operating in Brazil, comprising six different treatment processes: septic tank + anaerobic filter, facultative pond, anaerobic pond + facultative pond, activated sludge, UASB reactors alone, UASB reactors followed by post-treatment. The study evaluates and compares the observed effluent quality and the removal efficiencies in terms of BOD, COD, TSS, TN, TP and FC with typical values reported in the technical literature. In view of the large performance variability observed, the existence of a relationship between design/operational parameters and treatment performance was investigated. From the results obtained, no consistent relationship between loading rates and effluent quality was found. The influence of loading rates differed from plant to plant, and the effluent quality was dictated by several combined factors related to design and operation.

scholarly journals Prospects for environmentally safe mechanical biological treatment of municipal solid waste in Ukraine

2021 ◽  
Vol 255 ◽  
pp. 01002
Author(s):  
Yuliia Makovetska ◽  
Tetiana Omelianenko ◽  
Alla Omelchenko
Keyword(s):  
Waste Management ◽  
Waste Treatment ◽  
Recovery Period ◽  
Environmental Safety ◽  
Management Plans ◽  
Environmentally Safe ◽  
Treatment Technologies ◽  
Speed Up ◽  
The Cost ◽  
Biological Waste Treatment

Improving waste management is currently one of the priorities for Ukraine in the environmental safety. EU experience in the use of mechanical biological waste treatment technologies should be applied now in connection with the development and implementation of Regional Waste Management Plans in Ukrainian regions. The aim of the paper is to analyse the benefits and the preconditions of using mechanical biological waste treatment technologies in Ukraine, as well as barriers that may hinder the construction of mechanical biological waste treatment plants. The analysis of the eight drafts of the Regional Waste Management Plans showed that the mechanical biological waste treatment technologies market is free in Ukraine and the best option for the regions where there are cement plants operating is production of solid recovered fuel. Such types of projects could be affordable for Ukrainians with the cost recovery period more than 8 years. On the other hand there are significant obstacles of economic, organizational and technological nature to their immediate implementation i.e. low rates on waste disposal tax, partly compliance on air emissions monitoring system, absence of necessary standards etc. The priority actions to speed up mechanical biological waste treatment technologies implementation have been defined.

The impact of microbiological tools on mathematical modelling of biological wastewater treatment

1997 ◽  
Vol 36 (10) ◽  
pp. 97-108
Author(s):  
P. C. Pollard ◽  
E. v. Münch ◽  
P. A. Lant ◽  
P. F. Greenfield
Keyword(s):  
Wastewater Treatment ◽  
Mathematical Modelling ◽  
Waste Treatment ◽  
Control Strategies ◽  
Cost Effective ◽  
Design Guidelines ◽  
Biological Behaviour ◽  
Cost Effective Treatment ◽  
The Impact ◽  
Biological Waste Treatment

Biological systems are being used to treat an increasing range of complex wastes; domestic and industrial wastewaters containing nutrients and refractory organic compounds, soil sites and groundwater contaminated by organics, and organic solid residues. These treatment processes rely on micro-organisms and, more than ever before, must deliver higher quality outcomes at higher levels of reliability to protect the environment. At the same time, pressures to deliver cost-effective treatment have increased. The challenge for these biological treatment technologies and the associated engineering is to achieve the environmental and economic goals simultaneously. Mathematical modelling is an essential component in developing a detailed understanding of such processes, as well as design guidelines and suitable operating and control strategies. This paper provides a brief summary of the development of mathematical models for biological waste treatment systems, why they have become increasingly complex and how certain microbiological tools can provide the experimental means to validate more complex segregated and structured models of biological behaviour. With a number of specific modelling examples in the field of wastewater treatment, we illustrate the potential of these modern microbiological tools and their implications for gaining an improved understanding of biological waste treatment.

scholarly journals Applying performance indices in plantwide modelling for a comparative study of wastewater treatment plant operational strategies

Water SA ◽  
2018 ◽  
Vol 44 (4 October) ◽  
Author(s):  
Justine De Ketele ◽  
Dries Davister ◽  
David S Ikumi
Keyword(s):  
Wastewater Treatment ◽  
Mathematical Models ◽  
Wastewater Treatment Plant ◽  
Waste Treatment ◽  
Control Strategies ◽  
Treatment Plant ◽  
Expert Advice ◽  
Energy Costs ◽  
Performance Indices ◽  
Effluent Quality

Achievement of good effluent quality is always the main goal for wastewater treatment plant (WWTP) systems. However, these WWTPs have developed further objectives that include efficient design and strategic control options, with the prospect of their conversion into waste resource recovery facilities (WRRFs) that operate on reduced energy costs. With all these aspects becoming an intrinsic part of waste treatment, mathematical models that simulate WWTP unit processes are becoming of increasing relevance for the achievement of WRRF goals (including good effluent quality, low energy costs and nutrient recovery). It is expected that these mathematical models will benefit potential future applications of automation process control, which have also been developing rapidly with the availability of more reliable and affordable sensors. However, simulated automation control strategies require a thorough evaluation protocol to ensure their viability prior to being adopted as efficient operation control measures. This study considers the comparison of different control strategies implemented on a standard WWTP layout, for plant optimization. The initial task was to define performance indices, effluent quality index (EQI) and operation cost index (OCI), based on a previous investigation by the International Water Association (IWA) benchmark simulation modelling (BSM) task group. These performance indices were then used to evaluate the following strategies: (i) adding a fermentation tank, (ii) dosing flocculant and (iii) implementing a balancing tank. A control strategy was only assumed to be effective with improvement or maintenance of effluent quality. Overall, the evaluation exercise proved to be useful for providing expert advice on efficiency of proposed waste treatment system layouts, towards determination of the best configuration of future WRRFs. For instance, it was notable that significant organic strength is needed for removal of nutrients recycled back from the anaerobic digestion (AD) system into the activated sludge (AS) – hence alternate methods to put the nutrient-rich outflow from the AD system to good use are required.

scholarly journals Restoration of On-farm Constructed Wetland Systems Used to Treat Agricultural Wastewater

2019 ◽  
Vol 11 (4) ◽  
pp. 1
Author(s):  
Erin L. Smith ◽  
Lisa Kellman ◽  
Paul Brenton
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Management Practice ◽  
Surface Flow ◽  
Saturation Point ◽  
Best Management ◽  
Agricultural Wastewater ◽  
On Farm ◽  
Operational Potential

Two surface flow constructed wetland systems used to treat agricultural wastewater for over a decade were evaluated for their overall on-going treatment performance and future restoration need. Many on-farm constructed wetlands used for wastewater treatment in Atlantic Canada are now beginning to reach their saturation point and are no longer performing to their full operational potential. This study is an example of the process of evaluating when these systems are no longer viable; or are no longer functioning properly for wastewater treatment and outlines the steps necessary to restore their overall treatment capacities. On-farm constructed wetland restoration has been identified as a best management practice and can be accomplished successfully when important factors such as; landscape, hydrology, function, and the long-term farming goals are considered.

Model-based evaluation of an on-line control strategy for SBRs based on OUR and ORP measurements

2006 ◽  
Vol 53 (4-5) ◽  
pp. 161-169 ◽  
Author(s):  
Ll. Corominas ◽  
G. Sin ◽  
S. Puig ◽  
A. Traore ◽  
M. Balaguer ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Control Strategy ◽  
Control Strategies ◽  
Mechanistic Model ◽  
Treated Wastewater ◽  
Effluent Quality ◽  
Model Based ◽  
Treatment Technologies ◽  
On Line ◽  
Key Aspects

Application of control strategies for existing wastewater treatment technologies becomes necessary to meet ever-stricter effluent legislations and reduce the associated treatment costs. In the case of SBR technology, controlling the phase scheduling is one of the key aspects of SBR operation. In this study a calibrated mechanistic model based on the ASM1 was used to evaluate an on-line control strategy for the SBR phase-scheduling and compare it with the SBR's performance using no control strategy. To evaluate the performance, reference indices relating to the effluent quality, the required energy for aeration and the treated wastewater volume were used. The results showed that it is possible to maintain optimal SBR performance in the studied system at minimal costs by on-line control of the length of the aerobic and anoxic phases.

Review of Wastewater Treatment Technologies for Application in Communities in the Amazonian Varzea

2011 ◽  
Vol 7 (1) ◽  
pp. 59-69 ◽  
Author(s):  
João Paulo Borges Pedro ◽  
Maria Cecília Rosinski Lima Gomes ◽  
Ana Claudeíse Silva do Nascimento
Keyword(s):  
Wastewater Treatment ◽  
Treatment Technologies

Danish Experience with Emergent Hydrophyte Treatment Systems (EHTS) and Prospects in the Light of Future Requirements on Outlet Water Quality

1990 ◽  
Vol 22 (3-4) ◽  
pp. 65-72 ◽  
Author(s):  
H.-H. Schierup ◽  
H. Brix
Keyword(s):  
Wastewater Treatment ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Reed Beds ◽  
Effluent Quality ◽  
Multi Stage ◽  
Run Off ◽  
Stage System

Since 1983 approximately 150 full-scale emergent hydrophyte based wastewater treatment plants (reed beds) have been constructed in Denmark to serve small wastewater producers. The development of purification performance for 21 plants representing different soil types, vegetation, and hydraulic loading rates has been recorded. Cleaning efficiencies were typically in the range of 60-80% reduction for BOD, 25-50% reduction for total nitrogen, and 20-40% reduction for total phosphorus. The mean effluent BOD, total nitrogen and total phosphorus concentrations of the reed beds were 19 ± 10, 22 ± 9 and 6.7 ± 3.2 mg/l (mean ± SD), respectively. Thus, the general Danish effluent standards of 8 mg/l for N and 1.5 mg/l for P for sewage plants greater than 5,000 PE cannot be met by the present realised design of EHTS. The main problem observed in most systems is a poor development of horizontal hydraulic conductivity in the soil which results in surface run-off. Since the political demands for effluent quality will be more strict in the future, it is important to improve the performance of small decentral sewage treatment plants. On the basis of experiences from different types of macrophyte based and conventional low-technology wastewater treatment systems, a multi-stage system is suggested, consisting of sedimentation and sand filtration facilities followed by basins planted with emergent and submergent species of macrophytes and algal ponds.

Usacerl's Experiences with Small Wastewater Treatment Plants in the USA

1990 ◽  
Vol 22 (3-4) ◽  
pp. 49-56
Author(s):  
E. D. Smith ◽  
R. J. Scholze
Keyword(s):  
Wastewater Treatment ◽  
Waste Treatment ◽  
Wastewater Treatment Plants ◽  
Remote Site ◽  
Corps Of Engineers ◽  
Military Installations ◽  
Recreation Areas ◽  
The Usa ◽  
Rotating Biological Contactors ◽  
The U.S

This paper presents a review of collected experience of one of the U.S. Corps of Engineers research laboratories in the area of small systems for wastewater treatment. Findings and experiences are presented for the use of package plants such as rotating biological contactors (RBCs), and remote site waste treatment at military installations and recreation areas.

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