First estimation of occurrence and fate of organic substances in combined sewer systems with pollution load simulations

2007 ◽  
Vol 2 (2) ◽  
Author(s):  
A. Welker
Keyword(s):  
Waste Water Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Pollutant Emissions ◽  
Waste Water Treatment Plant ◽  
Organic Substances ◽  
Pollution Load ◽  
Sewer Systems ◽  
Wwtp Effluent ◽  
Combined Sewer

Emissions of selected organic substances from a hypothetical combined sewer system are calculated by pollution load simulation. The results are subsequently discussed. First, representative concentrations of chemical oxygen demand (COD), ammonium (NH4-N) and eight selected organics (polycyclic aromatic hydrocarbons (PAH), isoproturone, Di(2-ethylhexyl)phthalate (DEHP), ibuprofen, 17-ß-estradiol (E2), 17-a-ethinylestradiol (EE2), ethyl-enediamine tetraacetic acid (EDTA), nitrilo triaceticacid (NTA)) in dry weather flow, surface runoff and effluent of WWTP in combined sewer systems are stated based on a literature survey. The second part of the paper presents pollution load simulations and first calculations of possible dis-tributions of organics in combined sewer systems for a hypothetical catchment. Different scenarios of annual discharge loads of main emission matrices of the catchment (waste water treatment plant (WWTP) effluent and combined sewer overflow (CSO)) are compared to determine significant dis-charge points. The results of the pollution load simulations show that generally discharges from the WWTP dominate the total emissions of combined sewer systems. Nevertheless, emissions from CSOs are not negligible in some cases (e.g. for estradiol). In summary, the results give first indications about possible strategies to reduce pollutant emissions from combined sewer systems. The paper also formulates recommendations for the selected organic compounds.

Toxicity and pollutant impact analysis in an urban river due to combined sewer overflows loads

2010 ◽  
Vol 61 (1) ◽  
pp. 207-215 ◽  
Author(s):  
A. Casadio ◽  
M. Maglionico ◽  
A. Bolognesi ◽  
S. Artina
Keyword(s):  
Water Quality ◽  
Impact Analysis ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Quality Data ◽  
Waste Water Treatment Plant ◽  
Combined Sewer Overflows ◽  
Water Quality Data ◽  
Combined Sewer ◽  
Sewer Overflows

The Navile Channel (Bologna, Italy) is an ancient artificial water course derived from the Reno river. It is the main receiving water body for the urban catchment of Bologna sewer systems and also for the Waste Water Treatment Plant (WWTP) main outlet. The aim of this work is to evaluate the Combined Sewer Overflows (CSOs) impact on Navile Channel's water quality. In order to collect Navile flow and water quality data in both dry and wet weather conditions, two measuring and sampling stations were installed, right upstream and downstream the WWTP outflow. The study shows that even in case of low intensity rain events, CSOs have a significant effect on both water quantity and quality, spilling a considerable amount of pollutants into the Navile Channel and presenting also acute toxicity effects. The collected data shown a good correlations between the concentrations of TSS and of chemical compounds analyzed, suggesting that the most part of such substances is attached to suspended solids. Resulting toxicity values are fairly high in both measuring points and seem to confirm synergistic interactions between heavy metals.

scholarly journals Diseño De Una Planta De Tratamiento De Aguas Residuales Para Su Reutilización En Riego En Áreas Verdes

2017 ◽  
Vol 13 (18) ◽  
pp. 94
Author(s):  
Mayra Elizabeth Cáceres Mena ◽  
Carla Sofía Arguello Guadalupe ◽  
Marco Vinicio Pino Vallejo ◽  
Galo Briam Montenegro Córdova ◽  
Catalina Margarita Verdugo Bernal ◽  
...  
Keyword(s):  
Waste Water Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Treatment Processes ◽  
Green Areas ◽  
National University ◽  
Bodies Of Water ◽  
Real Scale

Over the last few years uncontrolled wastewater discharges have been generated in bodies of water which pose a high risk to the environment and human health. The present study is based on a laboratory prototype under controlled conditions with the aim: To return water quality indexes to safe conditions within the “Edison Riera” Campus at National University of Chimborazo for its reuse in the green areas irrigation, through unit processes based on the percentages reduction results of polluting organic matter and applying treatment processes by activated sludge. During the investigation the following results were obtained: Efficiency and reduction of biological and chemical oxygen demand by 93.75%, and 85.02%, coliforms color and turbidity decrease in 87.51%, 93.84% and 90.29% simultaneously, the same ones that have allowed designing a waste water treatment plant for irrigations in green areas in real scale.

Evaluation of Regional Domestic Waste Water Treatment Plant Performance in Cimahi City

2021 ◽  
Vol 18 (1) ◽  
pp. 141-152
Author(s):  
Mila Dirgawati ◽  
Mohamad Rangga Sururi ◽  
Wili Wiliana ◽  
Nining Widiawati
Keyword(s):  
Waste Water Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Quality Standards ◽  
Plant Performance ◽  
Waste Water Treatment Plant ◽  
Oil And Grease ◽  
Peak Period ◽  
Detention Time

Domestic wastewater treatment plant performance (WWTP) currently refers to stringent wastewater quality standards (Minister of Environment and Forestry Regulation No. 68 of 2016) considering potential environmental degradation because of pollutants in the wastewater. This study evaluated the performance of the Regional Domestic WWTP in Cimahi City. Cimahi has 10 WWTPs which were operated by an Anaerobic Baffled Reactor system. Periodic monitoring only measured the wastewater characteristics after treatment with parameters: total suspended solids (TSS), ammonia, chemical oxygen demand(COD), biological oxygen demand(BOD), and oil and grease. Therefore, wastewater characteristics were measured before and after treatment at selected WWTP during peak and non-peak hours, with TSS, ammonia, and COD. Important hydraulic factors were also measured: flow velocity at peak and non-peak hours, hydraulic detention time, and sludge height. Effluent from all WWTPs did not meet the standard. However, WWTPs with detention time >2 days produced parameter concentrations closed to the maximum value. The selected WWTP has a 5.7days detention time with removal efficiency for COD 57.52%, and TSS 42.56%, during peak period and COD 60.19% and TSS 34.84% for a non-peak period, but ammonia concentration did not decrease. Overall, WWTP has not been able to meet quality standards and the quality.

The application of improved flow diverter for first flush management

2010 ◽  
Vol 62 (9) ◽  
pp. 2167-2174 ◽  
Author(s):  
M. Mrowiec
Keyword(s):  
Suspended Solids ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Total Suspended Solids ◽  
Water Treatment Plant ◽  
Flow Diverter ◽  
Waste Water Treatment Plant ◽  
First Flush ◽  
Sewer Systems ◽  
Flow Diverters

The paper presents the investigations on first flush phenomenon based on the total suspended solids (TSS) concentration measurement during selected rainfalls at central part of Czestochowa (Poland) and also the hydrodynamic model of the catchment. The model allows to present the conception of first flush management using an improved flow diverter Septurn. Flow diverters used in the separate sewer systems create a hybrid system called “semi-separate” sewage system, which allows to treat the first flush volume in the waste water treatment plant (WWTP). Proposed construction of the flow diverter makes possible to capture significant part of the pollutant load (TSS) and simultaneously to reduce volume discharges to WWTPs during wet weather.

Effects of integrated stormwater management strategies on the combined sewer system and the wastewater treatment plant-river system

1999 ◽  
Vol 39 (2) ◽  
pp. 151-157
Author(s):  
A. Welker ◽  
U. Leinweber ◽  
K. Klepiszewski ◽  
T. G. Schmitt
Keyword(s):  
Stormwater Management ◽  
Waste Water Treatment ◽  
Management Strategies ◽  
Treatment Plant ◽  
River System ◽  
Ammonia Concentration ◽  
Waste Water Treatment Plant ◽  
Sewer System ◽  
Combined Sewer ◽  
Combined Sewer System

This is an investigation into possible changes to quantity and composition of sewage in the combined sewer system and the waste water treatment plant (WWTP) caused by new stormwater management strategies (mainly by disconnecting areas from the sewer system). Various scenarios were developed and the consequences on the water systems were calculated by using the simulation model KOSMO, in a fictional catchment. The results of the combined sewer overflow-calculation show an enormous decrease of the overflow annual load for different parameters (COD, ammonia) by the reduction of impervious surfaces. Thus, the overflow concentrations of some parameters increase dramatically under these conditions, in particular the ammonia concentration might cause critical situations (e.g. sensitive receiving water).

Phosphorus and nitrogen profile measurements to locate phosphorus limitation in a fixed bed filter

2009 ◽  
Vol 60 (10) ◽  
pp. 2537-2544 ◽  
Author(s):  
S. M. Scherrenberg ◽  
H. W. H. Menkveld ◽  
M. Bechger ◽  
J. H. J. M. van der Graaf
Keyword(s):  
Waste Water Treatment ◽  
Fixed Bed ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Phosphorus Limitation ◽  
Waste Water Treatment Plant ◽  
Nitrite Accumulation ◽  
The European Union ◽  
Wwtp Effluent ◽  
Filter Bed

The European Union presented in 2000 the European Water Framework Directive (WFD). Within the WFD approach the focus is more and more on ultra low nitrogen (<2.2 mg N-total/L) and phosphorus concentrations (<0.15 mg P-total/L) in waste water treatment plant (WWTP) effluent. Nitrogen concentrations of 2.2 mg N-total/L can be reached with denitrifying filters as a tertiary treatment step. When combining nitrogen and chemical phosphorus removal in a filter, phosphorus limitation may occur. After nitrite accumulation, caused by phosphorus limitation, was measured in the filtrate water of the dual media filter, research was started to locate, to understand and to solve the problem. Profile measurements for nitrate, nitrite and orthophosphorus (PO4-P) combined with COD and O2 were conducted. Results show that the minimal required PO4-P/NOx-N ratio is 0.006 mg/mg after coagulation and flocculation. Profile measurements have proven to be a useful tool. It showed how nitrate and orthophosphorus are removed through the filter bed and it showed the consequences for the PO4-P/NOx-N ratio. When orthophosphorus is removed more rapidly compared to nitrate the PO4-P/NOx-N ratio decreases. When the PO4-P/NOx-N ratio becomes below 0.006 mg/mg for a certain period of time, orthophosphorus limitation occurs. The solution can be either changing the filter bed configuration or decreasing the coagulant dosage.

scholarly journals The use of CFD modelling to optimise measurement of overflow rates in a downstream-controlled dual-overflow structure

2011 ◽  
Vol 64 (2) ◽  
pp. 521-527 ◽  
Author(s):  
G. Lipeme Kouyi ◽  
P. Bret ◽  
J.-M. Didier ◽  
B. Chocat ◽  
C. Billat
Keyword(s):  
Water Depth ◽  
Rectangular Channel ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Depth Sensor ◽  
Cfd Modelling ◽  
Hydrodynamic Behaviour ◽  
Combined Sewer

The measurement of the flow through complex combined sewer overflow structures in the frame of automated monitoring remains difficult. In this paper, a methodology based on the use of computational fluid dynamics (CFD) modelling in order to improve the instrumentation of a downstream-controlled dual-overflow structure is presented. The dual-overflow structure is composed of two combined sewer overflows (CSOs) connected by a rectangular channel and controlled by a downstream gate located at the entry of the Meyzieu waste water treatment plant (close to Lyon, France). The analysis of the CFD results provides: (i) a better understanding of the interaction between the two CSOs – that means the hydraulic operation, the hydrodynamic behaviour, the backflow effect – and (ii) an ability to optimise the location of the water depth sensor. The measured water depth is used to assess the overflow rate by means of a numerical relationship. Uncertainties are also assessed.

New parameter for monitoring fouling during ultrafiltration of WWTP effluent

2001 ◽  
Vol 43 (10) ◽  
pp. 241-248 ◽  
Author(s):  
J. H. Roorda ◽  
J. H.J.M. van der Graaf
Keyword(s):  
Water Quality ◽  
Membrane Fouling ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Feed Water ◽  
Sufficient Information ◽  
Cake Filtration ◽  
Ultrafiltration Membranes ◽  
Wwtp Effluent

Abstract Variations in water quality of waste water treatment plant (WWTP) effluent complicate ultrafiltration of this feed water. Traditional parameters do not provide sufficient information to explain the fouling of membranes during ultrafiltration of WWTP effluent. New parameters for measuring and monitoring the fouling potential of feed water for ultrafiltration membranes need to be developed. The normalised membrane fouling index for ultrafiltration membranes (MFI-UFn) can be used as such and is according to the cake filtration theory calculated from the ratio of filtration time and filtration volume as a function of the filtration volume. MFI-UFn can be calculated from both experiments with constant Trans Membrane Pressure (TMP) and from experiments with constant flux. This parameter can also be calculated independent of the scale of the experiment. Results show that differences in fouling potential can be measured for various feed waters using the same membrane type and for various membrane types using the same feed water. Variation in feed water quality leads to a deviation of the MFI-UFn, as was found especially for WWTP effluent. The applied TMP influences the value of the MFI-UFn, indicating cake compression when applying a higher TMP. MFI-UFn can be used to identify the effect of pre-treatment methods, which is useful when using WWTP effluent as feed water for an ultrafiltration processes.

A new database on urban runoff pollution: comparison of separate and combined sewer systems

2005 ◽  
Vol 51 (2) ◽  
pp. 119-128 ◽  
Author(s):  
H. Brombach ◽  
G. Weiss ◽  
S. Fuchs
Keyword(s):  
Treatment Plant ◽  
Pollution Load ◽  
Combined System ◽  
Concentration Data ◽  
Measured Concentration ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Long Time ◽  
Separate System ◽  
Receiving Waters

For a long time people have questioned what the “best” sewer system is for limiting the pollution load released into the receiving waters. In this paper the traditional separate and combined sewer systems are compared using a pollution load balance. The investigation is based on measured concentration data for a range of pollutant parameters in the sewer from the new database “ATV-DVWK Datenpool 2001”. The approach also accounted for the wastewater treatment plant outflow which contributes to the total pollutant load considerably. In spite of a number of neglected effects, the results show that the separate system is superior to the combined for some parameters only, such as nutrients, whereas for other parameters, e.g. heavy metals and COD, the combined system yields less total loads. Any uncritical preference of the separate system as a particularly advantageous solution is thus questionable. Individual investigations case by case are recommended.

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