scholarly journals Cyanobacterial and microcystins dynamics following the application of hydrogen peroxide to waste stabilisation ponds

2013 ◽  
Vol 10 (2) ◽  
pp. 2067-2088
Author(s):  
D. J. Barrington ◽  
A. Ghadouani ◽  
G. N. Ivey
Keyword(s):  
Hydrogen Peroxide ◽  
Full Scale ◽  
Management Technique ◽  
Waste Stabilization Ponds ◽  
Waste Stabilisation Ponds ◽  
Hydrogen Peroxide Treatment ◽  
Waste Stabilization ◽  
Cyanobacterial Species ◽  
Treatment Train ◽  
Term Management

Abstract. Cyanobacteria and cyanotoxins are a risk to human and ecological health, and a hindrance to biological wastewater treatment. This study investigated the use of hydrogen peroxide (H2O2) for the removal of cyanobacteria and cyanotoxins from within waste stabilization ponds (WSPs). The daily dynamics of cyanobacteria and microcystins (a commonly occurring cyanotoxin) were examined following the addition of H2O2 to wastewater within both the laboratory and at the full-scale within a WSP. Hydrogen peroxide treatment at concentrations ≥ 10−4 g H2O2 μg−1 of total phytoplankton chlorophyll a led to the death of cyanobacteria, in turn releasing intracellular microcystins to the dissolved state. In the full-scale trial, dissolved microcystins were then degraded to negligible concentrations by H2O2 and environmental processes within five days. A shift in the phytoplankton assemblage towards beneficial chlorophyta species was also observed within days of H2O2 addition. However, within weeks, the chlorophyta population was significantly reduced by the re-establishment of toxic cyanobacterial species. This re-establishment was likely due to the inflow of cyanobacteria from ponds earlier in the treatment train, suggesting that whilst H2O2 may be a suitable short-term management technique, it must be coupled with control over inflows if it is to improve WSP performance in the longer term.

scholarly journals Cyanobacterial and microcystins dynamics following the application of hydrogen peroxide to waste stabilisation ponds

2013 ◽  
Vol 17 (6) ◽  
pp. 2097-2105 ◽  
Author(s):  
D. J. Barrington ◽  
A. Ghadouani ◽  
G. N. Ivey
Keyword(s):  
Hydrogen Peroxide ◽  
Wastewater Treatment ◽  
Treatment Plant ◽  
Full Scale ◽  
Management Technique ◽  
Waste Stabilization Ponds ◽  
Waste Stabilisation Ponds ◽  
Hydrogen Peroxide Treatment ◽  
Waste Stabilization ◽  
Treatment Train

Abstract. Cyanobacteria and cyanotoxins are a risk to human and ecological health, and a hindrance to biological wastewater treatment. This study investigated the use of hydrogen peroxide (H2O2) for the removal of cyanobacteria and cyanotoxins from within waste stabilization ponds (WSPs). The daily dynamics of cyanobacteria and microcystins (commonly occurring cyanotoxins) were examined following the addition of H2O2 to wastewater within both the laboratory and at the full scale within a maturation WSP, the final pond in a wastewater treatment plant. Hydrogen peroxide treatment at concentrations ≥ 0.1 mg H2O2 μg−1 total phytoplankton chlorophyll a led to the lysis of cyanobacteria, in turn releasing intracellular microcystins to the dissolved state. In the full-scale trial, dissolved microcystins were then degraded to negligible concentrations by H2O2 and environmental processes within five days. A shift in the phytoplankton assemblage towards beneficial Chlorophyta species was also observed within days of H2O2 addition. However, within weeks, the Chlorophyta population was significantly reduced by the re-establishment of toxic cyanobacterial species. This re-establishment was likely due to the inflow of cyanobacteria from ponds earlier in the treatment train, suggesting that whilst H2O2 may be a suitable short-term management technique, it must be coupled with control over inflows if it is to improve WSP performance in the longer term.

Fluid flow pattern and water residence time in waste stabilisation ponds

2009 ◽  
Vol 59 (6) ◽  
pp. 1061-1068 ◽  
Author(s):  
F. Badrot-Nico ◽  
V. Guinot ◽  
F. Brissaud
Keyword(s):  
Meteorological Data ◽  
Residence Times ◽  
Mixing Processes ◽  
Waste Stabilization Ponds ◽  
Waste Stabilisation Ponds ◽  
Wind Speeds ◽  
Treatment Processes ◽  
Waste Stabilization ◽  
Physically Based ◽  
Completely Stirred Tank Reactor

As treatment processes are kinetic-dependent, a consistent description of water residence times is essential to the prediction of waste stabilization ponds performance. A physically-based 3D transient CFD model simulating the water velocity, temperature and concentration fields as a function of all influent meteorological factors – wind speed and direction, solar radiation, air temperature and relative humidity – was used to identify the relationships between the meteorological conditions and the hydrodynamic patterns and water residence times distributions in a polishing pond. The required meteorological data were recorded on site and water temperatures recorded at 10 sampling sites for 141 days. Stratification events appear on very calm days for wind speeds lower than 3 m s−1 and on sunny days for wind speeds lower than 5 m s−1. De-stratification is related to two mixing processes: nightly convection cells and global mixing patterns. Numerical tracer experiments show that the results of the flow patterns can be evaluated using the dispersed flow regime approximation and, for wind speeds exceeding 6 m s−1, the completely stirred tank reactor assumption.

Microalgal luxury uptake of phosphorus in waste stabilization ponds – frequency of occurrence and high performing genera

2017 ◽  
Vol 78 (1) ◽  
pp. 165-173 ◽  
Author(s):  
A. Crimp ◽  
N. Brown ◽  
A. Shilton
Keyword(s):  
Phosphorus Content ◽  
Microscopic Analysis ◽  
Full Scale ◽  
High Rate ◽  
Waste Stabilization Ponds ◽  
High Performing ◽  
Dissolved Phosphorus ◽  
Climatic Regions ◽  
Stabilization Ponds ◽  
Waste Stabilization

Abstract Microalgae commonly found in waste stabilization ponds (WSPs) are able to accumulate elevated phosphorus levels within their cells in a process known as luxury uptake. However, there are few studies focused on luxury uptake in full scale WSPs. In order to comprehensively quantify the occurrence of this phenomenon, eight different WSP sites comprising seven primary facultative, six maturation and two high rate algal ponds (HRAPs) spread over several climatic regions were monitored over four seasons. Of the 15 ponds studied, 13 of these exhibited elevated levels of biomass phosphorus content at some point; however, the occurrence in HRAPs was limited. More than half of the samples tested had elevated phosphorus contents and this occurred in all climatic zones surveyed. The phosphorus content of the biomass was significantly correlated to decreasing rainfall and increasing total dissolved phosphorus. Microscopic analysis revealed that nearly all the 17 microalgal and five cyanobacterial genera identified performed luxury uptake, but at varying frequencies. This is the first time that the genera of algae responsible for luxury uptake in full scale WSPs has been studied. Chlamydomonas/Cryptomonas, Micractinium/Microcystis and Scenedesmus were the only microalgal genera found to both commonly occur in WSPs and consistently perform luxury uptake.

Application of CFD modelling to study the hydrodynamics of various anaerobic pond configurations

2003 ◽  
Vol 48 (2) ◽  
pp. 163-171 ◽  
Author(s):  
G.P. Vega ◽  
M.R. Peña ◽  
C. Ramírez ◽  
D.D. Mara
Keyword(s):  
Full Scale ◽  
Two Dimensional ◽  
Cfd Modelling ◽  
Waste Stabilization Ponds ◽  
Hydrodynamic Efficiency ◽  
Advection Dispersion ◽  
Waste Stabilization ◽  
Breadth Ratio ◽  
Dispersion Patterns ◽  
Dynamic Variables

The simulation of hydrodynamics and transport phenomena in waste stabilization ponds is a developing tool worth studying in order to understand their internal processes and interactions. Pond design involves several physical, hydrological, geometric and dynamic variables so as to provide high hydrodynamic efficiency and maximum substrate utilization rates. CFD modelling allows the combination of these factors to predict the behaviour of ponds having different configurations. The two-dimensional depth-integrated model MIKE 21 was used in this study to simulate hydrodynamic and advection-dispersion processes in a full-scale anaerobic pond (AP) located in southwest Colombia. A set of 12 configurations including sludge contents, inlet-outlet positioning, baffling and pond geometry were modelled. Results showed that a crosswise (diagonally opposite) inlet-outlet layout, a length-to-breadth ratio of 2:1, plus provision of two cross baffles at 1/3 L and 2/3 L were the most effective measures to improve overall AP hydrodynamics and dispersion patterns.

Reversing clogging in Imhoff tanks by catalyzed hydrogen peroxide treatment

2015 ◽  
Vol 10 (2) ◽  
pp. 355-360
Author(s):  
Lee Boon Sing ◽  
MohdTaufik Salleh ◽  
Chua Bing Guan ◽  
Mohamed Haniffa Abdul Hamid ◽  
Abdul Kadir Mohd Din
Keyword(s):  
Hydrogen Peroxide ◽  
Full Scale ◽  
Innovative Approach ◽  
Filter Media ◽  
Hydrogen Peroxide Treatment

One of the most frequently encountered operational problems with Imhoff tanks is filter media clogging. Traditionally, the restoration procedure is to remove the clogged rock media and replace them with clean material. This is costly and may require the facility to close for a time. Recently, an innovative approach has been tested at lab- and full-scale. It consisted of aggressive oxidation and segregation of the clogged solids, using catalyzed hydrogen peroxide. The results indicate that, after treatment, clogging was substantially reduced. The outcomes of the lab- and full-scale studies are discussed in this paper.

Performance evaluation of 388 full-scale waste stabilization pond systems with seven different configurations

2016 ◽  
Vol 75 (4) ◽  
pp. 916-927 ◽  
Author(s):  
Maria Fernanda Espinosa ◽  
Marcos von Sperling ◽  
Matthew E. Verbyla
Keyword(s):  
System Performance ◽  
Oxygen Demand ◽  
The United States ◽  
Ammonia Nitrogen ◽  
Full Scale ◽  
Future Research ◽  
Waste Stabilization Ponds ◽  
Waste Stabilization ◽  
Thermotolerant Coliforms ◽  
Removal Efficiencies

Waste stabilization ponds (WSPs) and their variants are one the most widely used wastewater treatment systems in the world. However, the scarcity of systematic performance data from full-scale plants has led to challenges associated with their design. The objective of this research was to assess the performance of 388 full-scale WSP systems located in Brazil, Ecuador, Bolivia and the United States through the statistical analysis of available monitoring data. Descriptive statistics were calculated of the influent and effluent concentrations and the removal efficiencies for 5-day biochemical oxygen demand (BOD5), total suspended solids (TSS), ammonia nitrogen (N-Ammonia), and either thermotolerant coliforms (TTC) or Escherichia coli for each WSP system, leading to a broad characterization of actual treatment performance. Compliance with different water quality and system performance goals was also evaluated. The treatment plants were subdivided into seven different categories, according to their units and flowsheet. The median influent concentrations of BOD5 and TSS were 431 mg/L and 397 mg/L and the effluent concentrations varied from technology to technology, but median values were 50 mg/L and 47 mg/L, respectively. The median removal efficiencies were 85% for BOD5 and 75% for TSS. The overall removals of TTC and E. coli were 1.74 and 1.63 log10 units, respectively. Future research is needed to better understand the influence of design, operational and environmental factors on WSP system performance.

scholarly journals Differential Effect of Hydroxen Peroxide οn Toxic Cyanobacteria of Hypertrophic Mediterranean Waterbodies

2021 ◽  
Vol 14 (1) ◽  
pp. 123
Author(s):  
Theodoti Papadimitriou ◽  
Matina Katsiapi ◽  
Natassa Stefanidou ◽  
Aikaterini Paxinou ◽  
Vasiliki Poulimenakou ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Resistance Mechanisms ◽  
Cyanobacterial Blooms ◽  
Cylindrospermopsis Raciborskii ◽  
Rapid Decomposition ◽  
Promising Tool ◽  
Hydrogen Peroxide Treatment ◽  
Toxic Cyanobacteria ◽  
Cyanobacterial Species ◽  
Harmful Cyanobacterial Blooms

Cyanobacterial blooms have been known since ancient times; however, they are currently increasing globally. Human and ecological health risks posed by harmful cyanobacterial blooms have been recorded around the world. These risks are mainly associated with their ability to affect the ecosystem chain by different mechanisms like the production of cyanotoxins, especially microcystins. Their expansion and their harmful effects have led many researchers to seek techniques and strategies to control them. Among them, hydrogen peroxide could be a promising tool against cyanobacteria and cyanotoxins and it is well-established as an environmentally friendly oxidizing agent because of its rapid decomposition into oxygen and water. The aim of the present study was to evaluate the effect of hydrogen peroxide on phytoplankton from two hypertrophic waterbodies in Greece. The effect of hydrogen peroxide on concentration of microcystins found in the waterbodies was also studied. Treatment with 4 mg/L hydrogen peroxide was applied to water samples originated from the waterbodies and Cyanobacterial composition and biomass, phycocyanin, chlorophyll-a, and intra-cellular and total microcystin concentrations were studied. Cyanobacterial biomass and phycocyanin was reduced significantly after the application of 4 mg/L hydrogen peroxide in water treatment experiments while chlorophytes and extra-cellular microcystin concentrations were increased. Raphidiopsis (Cylindrospermopsis) raciborskii was the most affected cyanobacterial species after treatment of the water of the Karla Reservoir in comparison to Aphanizomenon favaloroi, Planktolyngbya limnetica, and Chroococcus sp. Furthermore, Microcystis aeruginosa was more resistant to the treatment of Pamvotis lake water in comparison with Microcystis wesenbergii and Microcystis panniformis. Our study showed that hydrogen peroxide differentially impacts the members of the phytoplankton community, affecting, thus, its overall efficacy. Different effects of hydrogen peroxide treatment were observed among cyanobacerial genera as well as among cyanobacterial species of the same genus. Different effects could be the result of the different resistance mechanisms of each genus or species to hydrogen peroxide. Hydrogen peroxide could be used as a treatment for the mitigation of cyanobacterial blooms in a waterbody; however, the biotic and abiotic characteristics of the waterbody should be considered.

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