scholarly journals Photo-Transformation of Effluent Organic Matter by ZnO-Based Sunlight Irradiation

2020 ◽  
Vol 10 (24) ◽  
pp. 9002
Author(s):  
Thao Thi Nguyen ◽  
Seong Nam Nam ◽  
Jeill Oh
Keyword(s):  
Organic Matter ◽  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Treatment Plant ◽  
Wastewater Effluent ◽  
Solar Irradiation ◽  
Effluent Organic Matter ◽  
Sunlight Irradiation ◽  
Vis Spectroscopy ◽  
The Impact

This study investigated the impact of effluent organic matter (EfOM) from wastewater effluent on the properties of organic matter in receiving water and the efficiency of its removal using photocatalysis. The organic matter is characterized using fluorescence excitation-emission matrices coupled with parallel factor analysis (EEM-PARAFAC), UV-Vis spectroscopy, and dissolved organic carbon (DOC) measurements. The experiments are conducted with water samples that were collected from upstream waters (used as a source of dissolved organic matter (DOM)), wastewater effluent (a source of EfOM), and waters downstream of a wastewater treatment plant, and with upstream water and wastewater effluent being mixed at different ratios in the lab (DOM/EfOM). EEM-PARAFAC analysis identifies three components: a humic-like component (C1), a tyrosine-like component (C2), and a terrestrial-like humic component (C3). When compared to DOM, EfOM has a higher specific ultraviolet absorbance at 254 nm (SUVA254), a higher fluorescence index (FI), and more abundant humic-like components. As the EfOM contribution increased, an increase in both humic-like components and a simultaneous decrease in the protein-like components are observed. The photocatalytic degradation of the organic matter using simulated solar irradiation with ZnO as a catalyst is examined. The removal efficiency of photocatalysis is calculated using the DOC, UV absorbance at 254 nm (UV254), and the maximum fluorescence intensity (Fmax) of the PARAFAC components. After 120 min of irradiation, the removal efficiency of photocatalysis differs between the DOM, EfOM, and EfOM-impacted samples due to the change in the properties of the organic matter in the source water. The photocatalytic degradation of organic matter follows pseudo-first-order kinetics, with the DOC and UV254 exhibiting a lower removal efficiency with the increasing contribution of EfOM, which indicated that EfOM has a potentially negative impact on the performance of drinking water treatment. The removal of PARAFAC components follows the order C3 > C1 > C2, indicating that humic-like components are preferentially removed when compared to protein-like components under sunlight irradiation.

Fouling of low-pressure (MF and UF) membranes by wastewater effluent organic matter (EfOM): characterization of EfOM foulants in relation to membrane properties

2003 ◽  
Vol 3 (5-6) ◽  
pp. 229-235 ◽  
Author(s):  
C. Laabs ◽  
G. Amy ◽  
M. Jekel ◽  
H. Buisson
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Treatment Plant ◽  
Low Pressure ◽  
Wastewater Effluent ◽  
Membrane Properties ◽  
Feed Water ◽  
Effluent Organic Matter ◽  
Efficient Operation ◽  
Atomic Force

Low-pressure (micro- and ultrafiltration) membranes are increasingly being used in water reclamation processes treating secondary or tertiary effluent from wastewater treatment plants. The main challenge remains the fouling of membrane surface/pores by organic matter which prevents efficient operation. The extent of this fouling strongly depends on feed water quality as well as membrane properties. The aim of this study is to characterize wastewater effluent organic matter (EfOM) and to describe its fouling behavior in relation to various membrane properties (pore size, charge, material, hydrophobicity) through evaluation with stirred cell experiments, elemental analysis, 13C-NMR spectroscopy, and atomic force spectroscopy. Four membranes are tested - one ultrafiltration (UF) membrane and three microfiltration (MF) membranes - with bulk EfOM, derived from the Boulder, Colorado, USA, wastewater treatment plant, as well as with EfOM isolates. The hydrophobic microfiltration membrane is most seriously fouled by bulk Boulder EfOM, while the two hydrophilic membranes (MF, UF) made of cellulose acetate are the least fouled. Differences between the flux decline curves of various membranes are less distinct with isolates than with bulk EfOM. The transphilic isolate (TPIA-Bld) exhibited a higher fouling potential than the hydrophobic isolate (HPOA-Bld). This behaviour is due to the different chemical characteristics of the isolates, namely the higher percentage of hetero-atoms (oxygen and nitrogen) of the transphilic isolate compared to the hydrophobic isolate. Finally, atomic force microscope (AFM) images present clear evidence of fouling. AFM is clearly able to detect the fouling layer, although it has not been possible to distinguish between pore blockage and surface fouling thus far.

Fate of effluent organic matter (EfOM) and natural organic matter (NOM) through riverbank filtration

2008 ◽  
Vol 57 (12) ◽  
pp. 1999-2007 ◽  
Author(s):  
S. K. Maeng ◽  
S. K. Sharma ◽  
A. Magic-Knezev ◽  
G. Amy
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Natural Organic Matter ◽  
Wastewater Effluent ◽  
Riverbank Filtration ◽  
Soil Columns ◽  
Effluent Organic Matter ◽  
Bulk Organic Matter ◽  
Water And Wastewater ◽  
The Impact

Understanding the fate of effluent organic matter (EfOM) and natural organic matter (NOM) through riverbank filtration is essential to assess the impact of wastewater effluent on the post treatment requirements of riverbank filtrates. Furthermore, their fate during drinking water treatment can significantly determine the process design. The objective of this study was to characterise bulk organic matter which consists of EfOM and NOM during riverbank filtration using a suite of innovative analytical tools. Wastewater effluent-derived surface water and surface water were used as source waters in experiments with soil columns. Results showed the preferential removal of non-humic substances (i.e. biopolymers) from wastewater effluent-derived surface water. The bulk organic matter characteristics of wastewater effluent-derived surface water and surface water were similar after 5 m soil passage in laboratory column experiment. Humic-like organic matter in surface water and wastewater effluent-derived surface water persisted through the soil passage. More than 50% of total dissolved organic carbon (DOC) removal with significant reduction of dissolved oxygen (DO) was observed in the top 50 cm of the soil columns for both surface water and wastewater effluent-derived surface water. This was due to biodegradation by soil biomass which was determined by adenosine triphosphate (ATP) concentrations and heterotrophic plate counts. High concentrations of ATP in the first few centimeters of infiltration surface reflect the highest microbial activity which correlates with the extent of DOC reduction. Good correlation of DOC removal with DO and biomass development was observed in the soil columns.

Impact of pretreatment on RO membrane organic fouling: composition and adhesion of tertiary wastewater effluent organic matter

2021 ◽  
Author(s):  
Nadine Siebdrath ◽  
Bertram Skibinski ◽  
Shiju Abraham ◽  
Roy Bernstein ◽  
Robert Berger ◽  
...  
Keyword(s):  
Organic Matter ◽  
Wastewater Effluent ◽  
Effluent Organic Matter ◽  
Membrane Performance ◽  
Organic Fouling ◽  
Ro Membrane

Organic fouling in RO desalination of tertiary wastewater is of major concern in the decline in membrane performance.

Characterization of wastewater effluent organic matter with different solid phase extraction sorbents

Chemosphere ◽  
2020 ◽  
Vol 257 ◽  
pp. 127235
Author(s):  
Xin Wang ◽  
Yuanyuan Ji ◽  
Quan Shi ◽  
Yahe Zhang ◽  
Chen He ◽  
...  
Keyword(s):  
Organic Matter ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Wastewater Effluent ◽  
Phase Extraction ◽  
Effluent Organic Matter

The impact of algogenic organic matter on water treatment plant operation and water quality: A review

2015 ◽  
Vol 46 (4) ◽  
pp. 291-335 ◽  
Author(s):  
M. Pivokonsky ◽  
J. Naceradska ◽  
I. Kopecka ◽  
M. Baresova ◽  
B. Jefferson ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Plant Operation ◽  
The Impact

scholarly journals Improving the ZnO-photocatalytic degradation of humic acid using powdered residuals from water purification plant

2021 ◽  
Author(s):  
Mohamed Elmougi ◽  
Hisham El-Etriby ◽  
Ragab Barakat ◽  
Mohamed Gar Alalm ◽  
Mohamed Mossad
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Water Purification ◽  
Degradation Kinetics ◽  
Irradiation Time ◽  
Treatment Plant ◽  
Operating Conditions ◽  
Coefficient Of Determination ◽  
Purification Plant

Abstract Alum residuals were collected from a water treatment plant and used for improving the photocatalytic degradation of humic acid (HA) by combinations of zinc oxide (ZnO) and powdered residuals from water purification plant (PRWPP). The influence of operating conditions such as initial humic acid concentration, pH, irradiation time, PRWPP to ZnO ratio, catalyst dose, and light illuminance have been investigated. The optimum PRWPP to ZnO ratio was 10:90. Using the prepared composites instead of bare ZnO raised the HA removal efficiency from 85.5% to 97.8%, and from 38% to 48.1% at catalyst doses of 1.2 g/l and 0.4 g/l, respectively. Moreover, it reduced energy consumption from 210.4 to 166.2 Wh per mg of HA. An artificial neural network model (ANN) was developed to predict the removal efficiency under different operating conditions. The optimum ANN structure yielded a coefficient of determination (R2 = 0.993). Modified Langmuir-Hinshelwood pseudo-first-order model was used for describing the degradation kinetics at different initial concentrations of HA.

scholarly journals Solar photocatalytic degradation of azo dye Reactive Black 5 in aqueous suspension of TiO2

2011 ◽  
Vol 1 (4) ◽  
pp. 202-207 ◽  
Author(s):  
Soon-An Ong ◽  
Ohm Mar Min ◽  
Li-Ngee Ho ◽  
Yee-Shian Wong ◽  
Fahmi Muhammad Ridwan
Keyword(s):  
Photocatalytic Degradation ◽  
Acidic Solution ◽  
Aqueous Suspension ◽  
Solar Irradiation ◽  
Air Sparging ◽  
Reactive Black 5 ◽  
Treatment Technology ◽  
Sunlight Irradiation ◽  
Solar Light Irradiation ◽  
Degradation Of Pollutants

Photocatalytic degradation of pollutants under solar light irradiation is an economically viable process and a very promising clean wastewater treatment technology. The aim of this study is to evaluate photocatalytic degradation of Reactive Black 5 (RB5) under natural sunlight irradiation with TiO2 as photocatalyst. The effects of initial concentration of RB5, dosage of TiO2, with/without solar irradiation, with/without air sparging and pH solution were examined. The decolorization rate improved with a higher dosage of TiO2, with sunlight irradiation and air sparging, and under acidic solution. The photocatalytic process not only decolorized the RB5 but also mineralized the intermediate products completely.

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