Organic load removal and microbial disinfection of raw domestic sewage using SrSnO3/g-C3N4 with sunlight

2021 ◽  
Author(s):  
Idio Alves de Sousa Filho ◽  
Daniel Oliveria Freire ◽  
Ingrid Távora Weber
Keyword(s):  
Domestic Sewage ◽  
Organic Load ◽  
Load Removal

scholarly journals Recent Advances in Photocatalytic Treatment of Palm Oil Mill Effluent (POME): A Review

2018 ◽  
Vol 7 (4.34) ◽  
pp. 389
Author(s):  
Ashwin Charles ◽  
Chin Kui Cheng
Keyword(s):  
Palm Oil ◽  
New Technologies ◽  
Cost Effective ◽  
Palm Oil Mill Effluent ◽  
Organic Load ◽  
Recent Advances ◽  
Viable Solution ◽  
Load Removal ◽  
Visible Light Driven ◽  
Palm Oil Mill

Palm oil mill effluent (POME) pollution is a serious issue that has gained the attention of an international audience including policy makers, mill owners, NGOs and academicians. With a production rate of 74 million metric tonnes a year, Malaysia is in dire need for new technologies able to address this mounting problem. While previous research has attempted to modify existing microbial driven organic degradation methods to optimize the organic load removal, new studies recognize the futility in this endeavour as mills are unwilling to change the way they operate and adopt these disruptive technologies. Instead current research aims at tertiary polishing technologies of which photocatalysis has emerged as a forerunner. Recent advances indicate photocatalytic treatment of POME is a viable solution to the problem but for it to be cost effective, future studies should focus on visible light driven processes and new reactor configurations to improve the photocatalytic activity of existing systems.  

scholarly journals Electro-Persulfate Processes for the Treatment of Complex Wastewater Matrices: Present and Future

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4821
Author(s):  
Annabel Fernandes ◽  
Maria João Nunes ◽  
Ana Sofia Rodrigues ◽  
Maria José Pacheco ◽  
Lurdes Ciríaco ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Environmental Concern ◽  
Industrial Effluents ◽  
Toxic Chemicals ◽  
Organic Load ◽  
Future Perspectives ◽  
Sulfate Radicals ◽  
Experimental Parameters ◽  
Load Removal ◽  
Activated Persulfate

Complex wastewater matrices present a major environmental concern. Besides the biodegradable organics, they may contain a great variety of toxic chemicals, heavy metals, and other xenobiotics. The electrochemically activated persulfate process, an efficient way to generate sulfate radicals, has been widely applied to the degradation of such complex effluents with very good results. This review presents the fundamentals of the electro-persulfate processes, highlighting the advantages and limitations, followed by an exhaustive evaluation on the application of this process for the treatment of complex industrial effluents. An overview of the main relevant experimental parameters/details and their influence on the organic load removal is presented and discussed, having in mind the application of these technologies at an industrial scale. Finally, the future perspectives for the application of the electro-persulfate processes in the treatment of complex wastewater matrices is outlined.

Equalization characteristics of an upflow sludge blanket – aerated biofilter (USB-AF) system

2005 ◽  
Vol 51 (10) ◽  
pp. 301-310 ◽  
Author(s):  
H.-B. Jun ◽  
S.-M. Park ◽  
J.-K. Park ◽  
S.-H. Lee
Keyword(s):  
Organic Matter ◽  
Removal Efficiency ◽  
Particulate Organic Matter ◽  
Domestic Sewage ◽  
Organic Load ◽  
Major Constituent ◽  
Anaerobic Sludge ◽  
Recycle Ratio ◽  
Particle Counts ◽  
Removal Efficiencies

Equalization characteristics of the upflow sludge blanket – aerated bio-filter (USB-AF) were investigated with the fluctuated raw domestic sewage. Recycle of nitrified effluent from AF to USB triggered the equalization characteristics of the sludge blanket on both soluble and particulate organic matter. Increment of EPS in sludge blanket by nitrate recycle was detected and removal of turbidity and particulates increased at higher recycle ratios by bio-flocculation. Increased TCOD removal in the USB was due to both denitrification of recycled nitrate and entrapment of the particulate organic matter in sludge blanket. Capture of both soluble and particulate organic matter increased sludge blanket layer in the USB, which improved the reactor performances and reduced the organic load on the subsequent AF. Overall TCOD and SS removal efficiencies were about 98% and 96%, respectively in the USB-AF system. Turbidity in the USB effluent was about 44, 20 and 5.5 NTU, at recycle ratios of 0, 100 and 200%, respectively. Particle counts in the range 2–4 μm in the USB effluent were higher than those in influent without nitrate recycle, while particle counts in the range of 0.5–15 μm in the USB effluent decreased 70% at recycle ratio of 200%. The major constituent of EPS extracted from anaerobic sludge was protein and total EPS increased from 109.1 to 165.7 mg/g-VSS with nitrate recycle of 100%. Removal efficiency and concentration of T-N in the UBS-AF effluent was over 70% and below 16 mg/L, respectively.

scholarly journals Evaluation of Filamentous Fungi and Yeasts for the Biodegradation of Sugarcane Distillery Wastewater

2020 ◽  
Vol 8 (10) ◽  
pp. 1588
Author(s):  
Graziella Chuppa-Tostain ◽  
Melissa Tan ◽  
Laetitia Adelard ◽  
Alain Shum-Cheong-Sing ◽  
Jean-Marie François ◽  
...  
Keyword(s):  
Filamentous Fungi ◽  
Oxygen Demand ◽  
Industrial Effluents ◽  
Organic Load ◽  
Initial Ph ◽  
Distillery Wastewater ◽  
Load Removal ◽  
Cheap Alternative ◽  
Ph Increase ◽  
High Chemical Oxygen Demand

Sugarcane Distillery Spent Wash (DSW) is among the most pollutant industrial effluents, generally characterized by high Chemical Oxygen Demand (COD), high mineral matters and acidic pH, causing strong environmental impacts. Bioremediation is considered to be a good and cheap alternative to DSW treatment. In this study, 37 strains of yeasts and filamentous fungi were performed to assess their potential to significantly reduce four parameters characterizing the organic load of vinasses (COD, pH, minerals and OD475nm). In all cases, a pH increase (until a final pH higher than 8.5, being an increase superior to 3.5 units, as compared to initial pH) and a COD and minerals removal could be observed, respectively (until 76.53% using Aspergillus terreus var. africanus and 77.57% using Aspergillus niger). Depending on the microorganism, the OD475nm could decrease (generally when filamentous fungi were used) or increase (generally when yeasts were used). Among the strains tested, the species from Aspergillus and Trametes genus offered the best results in the depollution of DSW. Concomitant with the pollutant load removal, fungal biomass, with yields exceeding 20 g·L−1, was produced.

scholarly journals Potencial bioquímico de metano de águas residuárias da ultrafiltração no processamento da acerola (Malpighia emarginata) verde

2020 ◽  
Vol 41 (2) ◽  
pp. 135
Author(s):  
Andreza Carla Lopes Andre ◽  
Miriam Cleide Cavalcante de Amorim ◽  
Kessia Caroline Dantas da Silva ◽  
Paula Tereza Souza e Silva
Keyword(s):  
Methane Production ◽  
Food Industry ◽  
Pilot Scale ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Biochemical Methane Potential ◽  
Decay Rate Constant ◽  
Malpighia Emarginata ◽  
Load Removal ◽  
Methane Potential

Ultrafiltration clarifies fruit juices, in the food industry, but generates retentive, recalcitrant wastewater, which, by its organic nature, may present a potential for biodegradation and methane production. This study aimed to evaluate the biochemical methane potential (BMP) in wastewater from the processing of unripe green acerola, obtaining the mass balance and the speed of organic load removal in COD terms. The BMP assays followed the German Guidelines VDI 4630, by applying three COD loads per liter of reactor vial (0,86 g CDOAplied L-1R, 1,5 g CDOAplied L-1R e 2,0 g CDOAplied L-1R), , in batches, inoculated with the anaerobic sludge from reactors treating domestic sewage, at 30 0C. The pH, COD, and methane production were evaluated every 48 hours. The biodegradability and the decay rate constant of the COD (Kd) were determined, thus obtaining the methanized COD, the COD for the formation of new cells, and the COD present in the wastewater, in the form of volatile acids. The best BMP was 0.100 L CH4 g -1 CDORemoved, the percentages of methanization were above 62 %, and the highest Kd occurred for the lowest load applied. The anaerobic digestion of the wastewater proved viable for in full-scale, with its application being suggested at a pilot scale.  

scholarly journals Artificial wetland planted with Limonium Perezzi, for the treatment of wastewater from tanning

2020 ◽  
Author(s):  
María Fernanda Castillo-Castañeda ◽  
Rafael Nikolay Agudelo-Valencia
Keyword(s):  
The Other ◽  
Organic Load ◽  
Artificial Wetlands ◽  
Different Types ◽  
Other Substances ◽  
Load Removal ◽  
Efficient Alternative ◽  
High Concentrations ◽  
Biological Treatment System ◽  
Contaminant Load

The wastewater from leather tanning contains different types of pollutants depending on the internal process that is carried out, in particular, the riparian and tanning stages provide the greatest contaminant load within the process, in terms of organic matter, grease and oils, chlorides, chromium, sulfides among other substances. This study analyzed the efficiency of a biological treatment system, consisting of artificial wetlands of horizontal subsurface flow, in order to evaluate the removal of salinity and organic load present in the water produced during the process of soaking leathers. Two prototypes were tested, one planted with Limonium perezzi and the other unplanted as a control parameter, the wetlands were operated for 32 days. The results show that the planted wetland removes 49.2% of the initial chloride present (44,414.8 mgCl-/L) in the water and 86.2% of the total organic carbon (755.9 mgC/L). It was demonstrated that artificial wetlands are still a viable and efficient alternative in terms of organic load removal, on the other hand, the selected plant showed a very good performance in the treatment of wastewater because of its high tolerance to high concentrations of salt dissolved in the water, reaching perspiration of sodium chloride crystals through the leaves and stem.

scholarly journals Effects of rainwater intrusion on an activated sludge sewer treatment system

2020 ◽  
Vol 15 (3) ◽  
pp. 1
Author(s):  
Diogo Botelho Correa de Oliveira ◽  
Willames De Albuquerque Soares ◽  
Marco Aurélio Calixto Ribeiro de Holanda
Keyword(s):  
Activated Sludge ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Design Flow ◽  
Organic Load ◽  
Effluent Quality ◽  
Pumping Stations ◽  
Load Removal ◽  
Rainy Days ◽  
Full Operation

 Effluent collection and stormwater management make use of different drainage systems, which should remain unconnected with one another. If stormwater drains into sewage collection systems, it often causes changes in effluent quality indicators at sewage treatment plants. This study sought to quantify the changes caused by rain in a Wastewater Treatment Plant (WWTP) located in Paulista, PE, which uses the activated sludge system. Accordingly, changes in pH, temperature, BOD, and treatment efficiency at the inlet and outlet, as well as inlet flow were analyzed on dry and rainy days at the plant, which has a sewage capacity of 400 L s-1. The input volume was found to be greater than the design flow of the station, about 25%. With this, some relevant operational controls were identified, such as temporarily shutting down sewage pumping stations in order to maintain full operation of the system and avoid overload. The pH increases slightly in alkalinity, about 0.3, but this does not interfere with the treatment process. The temperature of the influent on rainy days is about 3 to 5 degrees cooler, depending on the intensity of the event. Using the T and Z tests, it was possible to identify that BOD concentrations in the influent and the effluent were not significantly different (uneq. var. t: 1.18 > 0.26 and uneq var. z: 0.71 > 0.48, respectively), and the organic load removal efficiency was maintained, contrary to what is expected with other, more simple types of treatment.

Effect of dissolved metals on the organic load removal efficiency of Lemna gibba

1999 ◽  
Vol 33 (2) ◽  
pp. 530-538 ◽  
Author(s):  
Nicoletta Boniardi ◽  
Renato Rota ◽  
Giuseppe Nano
Keyword(s):  
Removal Efficiency ◽  
Organic Load ◽  
Lemna Gibba ◽  
Dissolved Metals ◽  
Load Removal
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