CSO treatment strategy based on constituent index relationships in a highly urbanised catchment

2007 ◽  
Vol 56 (12) ◽  
pp. 85-91 ◽  
Author(s):  
P. Piro ◽  
M. Carbone ◽  
G. Garofalo ◽  
J. Sansalone
Keyword(s):  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Treatment Effectiveness ◽  
Oxygen Demand ◽  
Biological Unit ◽  
Unit Operations ◽  
Physical Unit ◽  
Combined Sewer ◽  
Hydrologic Controls ◽  
Wet Weather

In urbanising catchments the variability of particulate matter (solids) and oxygen demanding constituents of wet weather and dry weather characteristics result in variable treatment effectiveness from physical unit operations and biological unit processes. Higher organic concentrations during dry weather flow are more amenable to biological unit processes while the higher inorganic loads generated largely by urban wet weather constituents and much larger flows can be more effectively treated or conditioned by physical unit operations, including ideally preceded by hydrologic controls. This study examines the relationships between total chemical oxygen demand (COD)t, dissolved chemical oxygen demand (COD)d, particulate chemical oxygen demand (COD)p and solids, measured as total suspended solids (TSS). Results also provide an index for selection and optimisation of treatment operations for combined sewer overflow (CSO) loads.

Accuracy of different sensors for the estimation of pollutant concentrations (total suspended solids, total and dissolved chemical oxygen demand) in wastewater and stormwater

2013 ◽  
Vol 68 (2) ◽  
pp. 462-471 ◽  
Author(s):  
Mathieu Lepot ◽  
Jean-Baptiste Aubin ◽  
Jean-Luc Bertrand-Krajewski
Keyword(s):  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Detection Methods ◽  
Time Step ◽  
Pollutant Concentrations ◽  
Uv Visible ◽  
Wet Weather

Many field investigations have used continuous sensors (turbidimeters and/or ultraviolet (UV)-visible spectrophotometers) to estimate with a short time step pollutant concentrations in sewer systems. Few, if any, publications compare the performance of various sensors for the same set of samples. Different surrogate sensors (turbidity sensors, UV-visible spectrophotometer, pH meter, conductivity meter and microwave sensor) were tested to link concentrations of total suspended solids (TSS), total and dissolved chemical oxygen demand (COD), and sensors' outputs. In the combined sewer at the inlet of a wastewater treatment plant, 94 samples were collected during dry weather, 44 samples were collected during wet weather, and 165 samples were collected under both dry and wet weather conditions. From these samples, triplicate standard laboratory analyses were performed and corresponding sensors outputs were recorded. Two outlier detection methods were developed, based, respectively, on the Mahalanobis and Euclidean distances. Several hundred regression models were tested, and the best ones (according to the root mean square error criterion) are presented in order of decreasing performance. No sensor appears as the best one for all three investigated pollutants.

scholarly journals Innovative monitoring of combined sewer overflow (CSO) quality in the Liguori catchnment (Cosenza, Italy)

2012 ◽  
Vol 47 (2) ◽  
pp. 178-185 ◽  
Author(s):  
Patrizia Piro ◽  
Marco Carbone ◽  
Giuseppina Garofalo
Keyword(s):  
Chemical Oxygen Demand ◽  
Treatment Plant ◽  
Treatment Strategies ◽  
Oxygen Demand ◽  
Combined Sewer Overflow ◽  
Planning Approach ◽  
Combined Sewer ◽  
Wet Weather ◽  
Wet Weather Flow ◽  
Sewer Overflow

Estimates of urban wet-weather flow pollutant loads are required to assess their impact on receiving waters and optimize wastewater treatment plant (WWTP) and combined sewer overflow (CSO) operations. In particular, a quantitative characterization of flow quality by means of fairly accurate monitoring is required for developing a rational planning approach and preferential treatment strategies. The main aim of this paper is to examine the qualitative–quantitative characteristics of wet-weather flow in an urbanized test catchment in Cosenza, Italy, and to compare three studied water quality constituent concentrations (total suspended solids (TSS), total chemical oxygen demand (CODt) and filtered chemical oxygen demand (CODf)) obtained by laboratory analyses to those measured by a UV/Vis spectrometer (‘spectrolyzer scan’), which represents a most modern and efficient spectrometric instrument requiring little maintenance. The results of such comparisons indicated the feasibility of using in situ spectroscopy to provide fairly accurate concentrations of the constituents studied, particularly in the case of CODt and CODf.

Technical solutions envisaged in managing solids in combined sewer networks

1996 ◽  
Vol 33 (9) ◽  
pp. 237-244 ◽  
Author(s):  
Ghassan Chebbo ◽  
Dominique Laplace ◽  
André Bachoc ◽  
Yves Sanchez ◽  
Benoit Le Guennec
Keyword(s):  
Large Scale ◽  
Suspended Solids ◽  
Drainage Area ◽  
Bed Load ◽  
Urban Drainage ◽  
Combined Sewer ◽  
Wet Weather ◽  
Technical Solutions ◽  
Dry Weather Flow ◽  
Sewer Networks

Solids in combined sewer networks represent two important technical questions: - the clogging of man-entry sewers, and - pollution in urban wet weather discharges, whose main vectors are generally suspended solids. In this paper, we shall present first, curative technical solutions which avoid or remove deposits in man-entry sewers. We shall discuss the partial extraction of the largest solids; selective trapping of bed load solids, which form deposits; and the displacement of deposits using dry weather flow flushing waves. We shall then examine technical solutions to control pollution in urban wet weather discharges. This will show that decantation is an efficient means of fighting pollution. However, it is not always feasible because it involves large scale investments. Complementary methods should, therefore, be developed and used at different points in the water's passage through an urban drainage area.

scholarly journals Wastewater treatment in flow photobioreactors continuous illuminated by artificial and solar light

2020 ◽  
Vol 9 (6) ◽  
pp. e183963748
Author(s):  
Rafael Souza Leopoldino Nascimento ◽  
Ludymyla Marcelle Lima Silva ◽  
Lucas Periard ◽  
Anibal da Fonseca Santiago
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Continuous Flow ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Operational Stability ◽  
Artificial Light ◽  
Light Emitting

The technology of microalgae photobioreactors and illuminated by LEDs has been widely studied for the treatment of wastewater. However, sunlight is a free resource and should be taken advantage of. But the question remains whether photobioreactors illuminated by natural (sunlight) light in combination with artificial light can have greater operational stability or greater performance when compared to systems illuminated only by artificial light. In this context, continuous flow photobioreactors illuminated by Light Emitting Diodes (LEDs) combined, or not, with sunlight were operated and had their performance evaluated. The variables analyzed were pH, OD, chemical oxygen demand (COD), chlorophyll - a and total suspended solids. The photobioreactors were effective for removing organic matter, with 75 ± 15% in the photobioreactor illuminated by LED and 65 ± 10% in the photobioreactor illuminated by sunlight and LED. The results showed that the use of combined lighting favors the production of dissolved oxygen and ensures greater operational stability in the removal of carbonaceous organic matter.

scholarly journals Taguchi Method and Response Surface Methodology in the Treatment of Highly Contaminated Tannery Wastewater Using Commercial Potassium Ferrate

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3784 ◽  
Author(s):  
Violetta Kozik ◽  
Krzysztof Barbusinski ◽  
Maciej Thomas ◽  
Agnieszka Sroda ◽  
Josef Jampilek ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Organic Carbon ◽  
Taguchi Method ◽  
Chemical Oxygen Demand ◽  
Total Organic Carbon ◽  
Response Surface ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Tannery Wastewater ◽  
Potassium Ferrate

The potential implementation of Envifer®, a commercial product containing potassium ferrate (40.1% K2FeO4), for the purification of highly contaminated tannery wastewater from leather dyeing processes was proposed. The employment of the Taguchi method for optimization of experiments allowed the discoloration (98.4%), chemical oxygen demand (77.2%), total organic carbon (75.7%), and suspended solids (96.9%) values to be lowered using 1.200 g/L K2FeO4 at pH 3 within 9 min. The application of the central composite design (CCD) and the response surface methodology (RSM) with the use of 1.400 g/L K2FeO4 at pH 4.5 diminished the discoloration, the chemical oxygen demand, the total organic carbon, and suspended solids within 9 min. The Taguchi method is suitable for the initial implementation, while the RSM is superior for the extended optimization of wastewater treatment processes.

Quality Monitoring and Property Analysis of Urban Initial Rainwater

2012 ◽  
Vol 212-213 ◽  
pp. 684-687 ◽  
Author(s):  
Yan Hong Wang ◽  
Yun Wen ◽  
Luan Liu
Keyword(s):  
Chemical Oxygen Demand ◽  
Water Environment ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Quality Monitoring ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Rainwater Runoff ◽  
Sewer Overflows ◽  
Runoff Pollution Control

Pollutants of urban rainwater runoff on water environment as well as the influencing factors are reviewed. By comparing with combined sewer overflows (CSOs), the paper thinks that urban rainwater runoff pollution control is necessary. Four months road runoff and Combined Sewer Overflows quality monitoring was carried in Luoyang, where indices included suspended solids(SS)，chemical oxygen demand(CODcr), dissolved chemical oxygen demand, Ammonia nitrogen(NH3-N) and total phosphorus(TP).The results showed that the concentrations of pollutants of Combined Sewer Overflows(CSOs)were higher than that of street runoff. Concentrations of pollutants in initial flush were very high, but they descended gradually and approached to the stabilization after a period of flushing. The main pollutants were SS, CODcr and NH3-N. By analyzing the correlation between SS and CODcr, and contrasting the content between total CODcr and dissolved CODcr, it inferred that SS was the main contribution to CODcr. The initial split-flow is suggested to handle the heavily polluted runoff.

scholarly journals Effluent Quality of Wet Process Coffee Processing Factories in Coffee Growing Ecological Zones in Burundi

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Bisekwa E ◽  
Njogu PM ◽  
Kufa-Obso T
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Processing Technology ◽  
Ecological Zones ◽  
Wet Process ◽  
Wastewater Samples ◽  
Field And Laboratory Conditions

Arabica coffee is cultivated by smallholders for commercial purposes, and it is commonly processed using wet Coffee Processing Technology. Burundi has more than 250 Coffee Processing factories which discharge their effluents to water bodies. The goal of this study was to determine the levels of physicochemical parameters in wastewater from Coffee Processing Technology factories in major coffee growing ecological zones in Burundi. Wastewater samples were collected from 19 sites representing private, public and cooperative owned coffee processing stations. Physicochemical analyses were determined in-situ field and laboratory conditions using standard procedures. Results indicate that the wastewater does not meet Burundi Effluent Discharge standards for Total Suspended solids, Chemical Oxygen Demand, Biochemical Oxygen Demand, pH. The data revealed that the wet coffee processing pollutes the environment in terms of pH, Total Suspended solids, Chemical Oxygen Demand, Biochemical Oxygen Demand. There is need to install quality polishing technologies to treat the water before disposal.

scholarly journals Remoción de cipermetrina presente en el baño de ganado utilizando humedales construidos

2016 ◽  
Vol 17 (2) ◽  
pp. 203 ◽  
Author(s):  
José Luis Marrugo Negrete ◽  
José Gregorio Ortega-Ruíz ◽  
Amado Enrique Navarro Frómeta ◽  
Germán Holland Enamorado Montes ◽  
Iván David Urango Cárdenas ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Quality Parameters ◽  
Cyperus Papyrus ◽  
Pumping System ◽  
Livestock Sector ◽  
Slow Sand Filter ◽  
Alpinia Purpurata ◽  
Production Losses

<p>Ectoparasite control in the livestock sector involves the use of chemicals to prevent production losses. In small farms that produce milk in the Córdoba department, the use of the pumping system for the cattle bath is common between farmers. In this work, cypermethrin degradation efficiency was evaluated in three lab-scale subsurface flow constructed wetland planted with Limnocharis flava, Cyperus papyrus and Alpinia purpurata sp., and one unplanted system, all of the beds were gravel based; then, total suspended solids and total phosphorus retention, and elimination of chemical oxygen demand were measured as water quality parameters. The wastewater was pretreated in a descending-ascending slow sand filter, and then was conducted to a wetland continuous flow fed at 7 ml/min. Limnocharis flava bed was higher for the degradation of organic compounds, with 97.9 ± 2.5 % and 69.1 ± 3.7 % for cypermethrin and chemical oxygen demand respectively, with statistically significant differences (p &lt; 0,05) respect to unplanted bed. The higher SST removal were found in the Cyperus papyrus wetland, with 62,0 %, however, no differences were observed with the other evaluated planted systems, as opposed these were significantly higher than unplanted wetlands.</p>

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