Development and assessment of an integrated ecological modelling framework to assess the effect of investments in wastewater treatment on water quality

2014 ◽  
Vol 70 (11) ◽  
pp. 1798-1807 ◽  
Author(s):  
Javier E. Holguin-Gonzalez ◽  
Pieter Boets ◽  
Gert Everaert ◽  
Ine S. Pauwels ◽  
Koen Lock ◽  
...  
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
River Water ◽  
Treatment Plant ◽  
Integrated Approach ◽  
River Water Quality ◽  
Ecological Modelling ◽  
Nitrogen And Phosphorus ◽  
Modelling Framework ◽  
Nitrogen Concentrations

Worldwide, large investments in wastewater treatment are made to improve water quality. However, the impacts of these investments on river water quality are often not quantified. To assess water quality, the European Water Framework Directive (WFD) requires an integrated approach. The aim of this study was to develop an integrated ecological modelling framework for the River Drava (Croatia) that includes physical-chemical and hydromorphological characteristics as well as the ecological river water quality status. The developed submodels and the integrated model showed accurate predictions when comparing the modelled results to the observations. Dissolved oxygen and nitrogen concentrations (ammonium and organic nitrogen) were the most important variables in determining the ecological water quality (EWQ). The result of three potential investment scenarios of the wastewater treatment infrastructure in the city of Varaždin on the EWQ of the River Drava was assessed. From this scenario-based analysis, it was concluded that upgrading the existing wastewater treatment plant with nitrogen and phosphorus removal will be insufficient to reach a good EWQ. Therefore, other point and diffuse pollution sources in the area should also be monitored and remediated to meet the European WFD standards.

Simulation of wastewater treatment plant within integrated urban wastewater models

2010 ◽  
Vol 61 (10) ◽  
pp. 2645-2652 ◽  
Author(s):  
S. Heusch ◽  
B. Kamradt ◽  
M. Ostrowski
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Planning Process ◽  
Treatment Plant ◽  
Federal State ◽  
Quality Model ◽  
Modelling Framework ◽  
Software Modelling

In the federal state of Hesse in Germany the application of an integrated software modelling framework is becoming part of the planning process to attain legal approval for the operation of combined sewer systems. The software allows for parallel simulation of flow and water quality routing in the sewer system and in receiving rivers. It combines existing pollution load model approaches with a simplified version of the River Water Quality Model No. 1 (RWQM1). Comprehensive simulation of the wastewater treatment plant (WWTP) is not considered yet. The paper analyses alternatives for the implementation of a WWTP module to model activated sludge plants. For both primary and secondary clarifiers as well as for the activated sludge process concepts for the integration into the existing software framework were developed. The activated sludge concept which uses a linearized version of the well known ASM1 model is presented in detail.

scholarly journals Assessment of River Water Quality Based on an Improved Fuzzy Matter-Element Model

2019 ◽  
Vol 16 (15) ◽  
pp. 2793 ◽  
Author(s):  
Yumin Wang ◽  
Weijian Ran ◽  
Lei Wu ◽  
Yifeng Wu
Keyword(s):  
Water Quality ◽  
River Water ◽  
Objective Assessment ◽  
Integrated Approach ◽  
Element Model ◽  
River Water Quality ◽  
Matter Element Model ◽  
Pair Analysis ◽  
Coefficient Method

In this paper, an improved fuzzy matter-element (IFME) method was proposed, which integrates the classical matter-element (ME) method, set pair analysis (SPA), and variable coefficient method (VCM). The method was applied to evaluate water quality of five monitor stations along Caoqiao River in Yixing city, Jiangsu Province, China. The levels of river water quality were determined according to fuzzy closeness degree. Compared with the traditional evaluation methods, the IFME method has several characteristics as follows: (i) weights were determined by the VCM method, which can reduce workload and overcome the adverse effects of abnormal values, (ii) membership degrees were defined by SPA, which can utilize monitored data more scientifically and comprehensively, and (iii) IFME is more suitable for seriously polluted rivers. Overall, these findings reinforce the notion that an integrated approach is essential for attaining scientific and objective assessment of river water quality.

Real time control of the integrated urban wastewater system using simultaneously simulating surrogate models

2002 ◽  
Vol 45 (3) ◽  
pp. 109-116 ◽  
Author(s):  
J. Meirlaen ◽  
J. Van Assel ◽  
P. A. Vanrolleghem
Keyword(s):  
Water Quality ◽  
Real Time ◽  
River Water ◽  
Control Strategy ◽  
Treatment Plant ◽  
River Water Quality ◽  
Urban Wastewater ◽  
Real Time Control ◽  
Time Control

The urban wastewater system (sewer and treatment plant) has a major impact on the river water quality of urban streams. To minimise this impact, real time control is a valuable option. Since the ultimate goal of any control strategy is to optimise the quality of the river system, it is useful to take pollutant immissions into account when determining the control strategy and/or the setpoints of the controller. However, a simultaneously simulating model of the complete system is needed in order to allow design and evaluation of such control strategies. In this work an integrated model of the urban wastewater system is created. This has been accomplished by implementing surrogate models of the three subsystems within a single software platform. The coupled submodels are subsequently used in a semi-hypothetical case study to optimise the resulting river water quality. An ammonia sensor in the river has been used to control the amount of water treated biologically in the treatment plant. It was shown that this integrated control could lower the peak ammonia concentration in the part of the river downstream of the treatment plant. Hence, a proof of principle has been given that the use of measurements in the river to perform control actions in the sewer system and the treatment plant is a promising option.

Using a constructed wetland for non-point source pollution control and river water quality purification: a case study in Taiwan

2010 ◽  
Vol 61 (10) ◽  
pp. 2549-2555 ◽  
Author(s):  
C. Y. Wu ◽  
C. M. Kao ◽  
C. E. Lin ◽  
C. W. Chen ◽  
Y. C. Lai
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Quality Improvement ◽  
Point Source ◽  
River Water ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
River Water Quality ◽  
Water Quality Improvement ◽  
Wetland System

The Kaoping River Rail Bridge Constructed Wetland, which was commissioned in 2004, is one of the largest constructed wetlands in Taiwan. This multi-function wetland has been designed for the purposes of non-point source (NPS) pollutant removal, wastewater treatment, wildlife habitat, recreation, and education. The major influents of this wetland came from the local drainage trench containing domestic, agricultural, and industrial wastewaters, and effluents from the wastewater treatment plant of a paper mill. Based on the quarterly investigation results from 2007 to 2009, more than 96% of total coliforms (TC), 48% of biochemical oxygen demand (BOD), and 40% of nutrients (e.g. total nitrogen, total phosphorus) were removed via the constructed wetland system. Thus, the wetland system has a significant effect on water quality improvement and is capable of removing most of the pollutants from the local drainage system before they are discharged into the downgradient water body. Other accomplishments of this constructed wetland system include the following: providing more green areas along the riversides, offering more water assessable eco-ponds and eco-gardens for the public, and rehabilitating the natural ecosystem. The Kaoping River Rail Bridge Constructed Wetland has become one of the most successful multi-function constructed wetlands in Taiwan. The experience obtained from this study will be helpful in designing similar natural treatment systems for river water quality improvement and wastewater treatment.

Operational River Water Quality Management

1984 ◽  
Vol 16 (5-7) ◽  
pp. 381-392 ◽  
Author(s):  
P W Jowitt ◽  
J P Lumbers ◽  
M B Beck ◽  
W O Jenkins
Keyword(s):  
Water Quality ◽  
River Water ◽  
Surface Waters ◽  
Waste Water Treatment ◽  
Water Quality Management ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
River Water Quality ◽  
Waste Water Treatment Plant ◽  
Operational Control

The developments in water pollution control legislation and their interpretation are discussed in the context of the current need to establish flexible operational control hierarchies reflecting conflicting uses of surface waters and overall basin economy. Fussy logic is proposed as a technique to aid the reconciliation of within-plant and within-receiving water operational targets with the consistent interpretation of statutory requirements. An example simulation of the control of a waste-water treatment plant to meet time-varying river water quality objectives is presented in support of the argument.

Ranking strategies for stormwater management under uncertainty: sensitivity analysis

1997 ◽  
Vol 36 (5) ◽  
pp. 357-371 ◽  
Author(s):  
A.L.L. Reda ◽  
M.B. Beck
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Model Uncertainty ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Integrated Approach ◽  
Urban Environments ◽  
Real Time Control ◽  
Ammonium N ◽  
Receiving Water

The disadvantageous consequences of stormwater perturbations of receiving water quality in urban environments can be attenuated by exercising control at various locations across the sewer network, wastewater treatment plant, and the stream itself. As part of a long-standing programme of research on developing an integrated approach to the management and real-time control of water quality in river basins, the paper examines the sensitivity of the associated strategies to model uncertainty. Specifically, results are presented for a case study based on a 10km stretch of the River Cam as it passes through the city of Cambridge in eastern England. The options for control are restricted to design and operational features of the wastewater treatment facility. Assessment is according to maximum and cumulative values of mass flows of ammonium-N and biochemical oxygen demand, together with the duration of dissolved oxygen concentration below 4.0 gm−3, at the downstream boundary of the system. A straightforward analysis of the sensitivity of these criteria to changes in the parameterisation of a model for receiving water quality shows that the ranking of strategies is robust in the face of model uncertainty. Minor differences in ranking occur as a function of whether judgement is based on ammonium-N or the other two attributes of water quality and whether attention is focused on the treatment plant in isolation or performance across the system as a whole. However, such conclusions must be qualified by noting that our analysis has been limited in its scope and elementary in its treatment of uncertainty.

River Water Quality Modelling: III. Future of the Art

1998 ◽  
Vol 38 (11) ◽  
pp. 253-260 ◽  
Author(s):  
L. Somlyódy ◽  
M. Henze ◽  
L. Koncsos ◽  
W. Rauch ◽  
P. Reichert ◽  
...  
Keyword(s):  
Water Quality ◽  
River Water ◽  
River Water Quality ◽  
Task Group ◽  
Water Quality Modelling ◽  
Quality Model ◽  
Nitrogen And Phosphorus ◽  
Support Tool ◽  
Research Education ◽  
River Water Quality Modelling

This paper is the third of a three-part series summarizing the background to and objectives of the activity of the IAWQ Task Group on River Water Quality Modelling (RWQM). On the basis of the two other papers and a comparison between the best known state of the art river model, QUAL2E, and the IAWQ Activated Sludge Model (ASM) No. 1, the Task Group proposes to develop improved conversion models for inclusion in a river water quality model. The model should describe the cycling of oxygen, nitrogen, and phosphorus in both water and sediment, and should be compatible with the ASM to support the development of integrated emission reduction strategies. The model should be particularly well suited to handle problems characterized by significant temporal and spatial influences (e.g. CSOs and NPSs). It should serve for research, education, improved communication, knowledge transfer, regulatory applications such as catchment planning, and improved data collection. Anticipated results of the Task Group effort include: (i) standardized conversion sub-models; (ii) a decision support tool to guide model construction and usage; and (iii) case study applications. The model development, which is not intended to result in a software product, is intended to be an open-ended and flexible process to encourage the participation of interested professionals.

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