Magnetic zeolite synthesis for efficient removal of cesium in a lab-scale continuous treatment system

2020 ◽  
Vol 571 ◽  
pp. 66-79 ◽  
Author(s):  
Omar Falyouna ◽  
Osama Eljamal ◽  
Ibrahim Maamoun ◽  
Atsushi Tahara ◽  
Yuji Sugihara
Keyword(s):  
Treatment System ◽  
Continuous Treatment ◽  
Zeolite Synthesis ◽  
Efficient Removal ◽  
Magnetic Zeolite

DESIGN BIOTREATMENT UNIT FOR WATER SULFUR FOR AGRICULTURE PURPOSE

2000 ◽  
pp. 11-19
Author(s):  
Idham Abed ◽  
Saif A. Salem ◽  
Ahamed Mahmood
Keyword(s):  
Sulfur Content ◽  
Treatment System ◽  
Continuous Treatment ◽  
Western Desert ◽  
Time Interval ◽  
Mushroom Compost ◽  
Health And Environmental Effects ◽  
Treatment Unit ◽  
Multi Stage ◽  
Western Desert Of Iraq

This study was conducted in order to evaluate the uses of sulfur-rich water found in the Western desert of Iraq an assessment was made to select more suitable procedure for using this type of water without negative health and environmental effects, so a field survey of the wells in area was under taken, measuring its discharge sulfur content. Multi-stage treatment system was made using different material such as fermented wheat straw with A. niger, spent mushroom compost, and calcinated rock phosphate ,limestone inoculated with sulfur oxidizing and reducing bacteria, also using continuous treatment system for different time interval of 12, 24, and 36 hours. The results showed existence of sulfur-rich water in Km70 area was superior in its sulfur content 2000 mg l-1. treatments W1 and W2 removed SO4 and hydrogen sulfide by 66.01 and 64.7, 90.97, and 91.6% respectively. Time interval treatment 24 hours. The values of potential salinity in the case of continuous treatments W1 and W2 for 24 hours approached the rates of 12.15 and 11.66, respectively. The efficiency of continuous treatment unit W1 and W2 for hundred days period approached 72 and 96%, respectively.

Inactivating microorganisms using a pulsed electric field continuous treatment system

1998 ◽  
Vol 34 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Bai-Lin Qin ◽  
G.V. Barbosa-Canovas ◽  
B.G. Swanson ◽  
P.D. Pedrow ◽  
R.G. Olsen
Keyword(s):  
Electric Field ◽  
Pulsed Electric Field ◽  
Treatment System ◽  
Continuous Treatment

scholarly journals Ultrafiltration/Granulated Active Carbon-Biofilter: Efficient Removal of a Broad Range of Micropollutants

2019 ◽  
Vol 9 (4) ◽  
pp. 710 ◽  
Author(s):  
Christian Baresel ◽  
Mila Harding ◽  
Johan Fång
Keyword(s):  
Active Carbon ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Filter Material ◽  
Treatment System ◽  
Municipal Sewage ◽  
Efficient Removal ◽  
Sustainable Solutions ◽  
Pharmaceutical Residues ◽  
Low Concentrations

Pharmaceutical residues, and other organic micropollutants that pass naturally through the human body into sewage, are in many cases unaffected by treatment processes at conventional wastewater treatment plants (WWTPs). Accumulated in the environment, however, they can significantly affect aquatic ecosystems. The present study provides an evaluation of a treatment system for the removal of pharmaceutical residues and other micropollutants. The system is based on a Membrane Bioreactor (MBR), including ultrafiltration (UF), followed by a biofilter using granulated active carbon (GAC) as filter material. It was found that all investigated micropollutants, such as pharmaceutical residues, phenolic compounds, bacteria and microplastic particles, present in wastewater, could be removed by the treatment system to below detection limits or very low concentrations. This shows that the combination of filtration, adsorption and biodegradation provides a broad and efficient removal of micropollutants and effects. The tested treatment configuration appears to be one of the most sustainable solutions that meets today’s and future municipal sewage treatment requirements. The treatment system delivers higher resource utilization and security than other advanced treatment systems including solely GAC-filters without biology.

Efficient removal of methyl orange from aqueous solution using mesoporous ZSM-5 zeolite: Synthesis, kinetics and isotherm studies

2021 ◽  
Vol 611 ◽  
pp. 125852
Author(s):  
Sabarish Radoor ◽  
Jasila Karayil ◽  
Aswathy Jayakumar ◽  
Jyotishkumar Parameswaranpillai ◽  
Suchart Siengchin
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Zeolite Synthesis ◽  
Efficient Removal

scholarly journals Design and development of a biotreatment of E. crassipes for the decontamination of water with Chromium (VI)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Uriel Fernando Carreño Sayago
Keyword(s):  
Heavy Metals ◽  
Diffusion Constant ◽  
Intraparticle Diffusion ◽  
Treatment System ◽  
Continuous Treatment ◽  
Chromium Vi ◽  
Adsorption Capacities ◽  
Diffusion Speed ◽  
And Performance ◽  
Cellulose Materials

AbstractThe use of cellulose materials for the adsorption of heavy metals has increased in favorable results to comply with the removal of these contaminants from water, such as the case of Chromium (VI), being one of the most dangerous heavy metals for the environment and human health. The objective of this research is to design and develop a biotreatment with dry and crushed biomass of E. crassipes for the continuous treatment of Chromium (VI), determining through mathematical modeling the Fick diffusion constant (Kf), based on this constant Fick will establish the performance of the biotreatment and the intraparticle diffusion constant (Ks). The diffusion speed (Kf) of the biomass of E. crassipes chemisorbing Cr (VI) of 0.30 cm/min, also it got the constant of the adsorption capacities (Ks) was 0.0198 s. With (Kf) it can design the treatment systems according to caudal or load greatly contaminated, calibrating the parameters how caudal, volume, or area of contact of the system of treatment. Also with (Ks) will be possible the design and modeling of a treatment system to improve the capacity of adsorptions calibrating the density of the particle and the density of the contact bed of the treatment system. Based on Fick's second law, an equation was designed to determine the reliability and performance of water treatment systems through the E. crassipes plant.

Domestic sewage treatment in a pilot system composed of UASB and SBR reactors

2001 ◽  
Vol 44 (4) ◽  
pp. 247-253 ◽  
Author(s):  
P. Torres ◽  
E. Foresti
Keyword(s):  
Sewage Treatment ◽  
Operating Parameter ◽  
Domestic Sewage ◽  
Operating Conditions ◽  
Phosphate Removal ◽  
Treatment System ◽  
Uasb Reactor ◽  
Efficient Removal ◽  
Aeration Time ◽  
Nitrogen And Phosphate Removal

The results obtained from the operation of a treatment system composed of an anaerobic (up-flow sludge blanket - UASB) reactor followed by an aerobic (sequencing batch - SBR) reactor treating domestic sewage are presented and discussed. The pilot plant was monitored during 6 months, aiming to obtain performance data on organic matter, nitrogen and phosphate removal under different operating conditions. The UASB reactor was operated at a constant hydraulic detention time (θ) of 6 h while the SBR performance was monitored in four different duration cycles (24, 12, 6 and 4 h) corresponding to aeration times (AT) of 22, 10, 4 and 2 h, respectively. COD and TSS overall removal efficiencies (Eo) up to 91% and 84%, respectively, were achieved independently on the aeration time applied to the SBR. In respect to nitrification and phosphate removal, AT was found to be a determinating operating parameter. TKN removal of approximately 90% was achieved for AT equal to or higher than 10 h; complete nitrification occurred for AT higher than 4 h; significant phosphate removal (72%) occurred only at the AT of 2 h. It was not possible to achieve simultaneous efficient removal of nitrogen and phosphate, under the operating conditions imposed on the treatment system.

Decontamination of Strawberries Using Batch and Continuous Chlorine Dioxide Gas Treatments†

2004 ◽  
Vol 67 (11) ◽  
pp. 2450-2455 ◽  
Author(s):  
Y. HAN ◽  
T. L. SELBY ◽  
K. K. SCHULTZE ◽  
P. E. NELSON ◽  
R. H. LINTON
Keyword(s):  
Chlorine Dioxide ◽  
Treatment System ◽  
Continuous Treatment ◽  
Plate Count ◽  
Continuous Systems ◽  
Continuous Exposure ◽  
Gas Treatment ◽  
Recovery Method ◽  
E Coli ◽  
Batch Treatment

Efficacy of chlorine dioxide (ClO2) gas in reducing Escherichia coli O157:H7 and Listeria monocytogenes on strawberries was determined using batch and continuous flow ClO2 gas treatment systems. Effects of continuous ClO2 gas treatment on total aerobic plate count, color, and residual ClO2 and chlorite on strawberries were also evaluated. Strawberries were spot inoculated with 7 to 8 log CFU per strawberry of each pathogen (E. coli O157:H7 and L. monocytogenes), stored for 1 day at 4°C, and treated at 22°C and 90 to 95% relative humidity with 0.2 to 4.0 mg/liter ClO2 gas for 15 or 30 min using a batch treatment system or with 0.6, 1.8, and 3.0 mg/liter for 10 min using a continuous treatment system. Surviving microbial populations were determined using a membrane-transfer plating recovery method. Increased ClO2 gas concentrations resulted in increased log reductions of each pathogen for both the batch and continuous systems. A batch treatment of strawberries with 4 mg/liter ClO2 for 30 min and continuous treatment with 3 mg/liter ClO2 for 10 min achieved greater than a 5-log reduction for both E. coli O157:H7 and L. monocytogenes. After continuous exposure to 3.0 mg/liter ClO2 gas for 10 min followed by 1 week of storage at 4°C, no aerobic microorganisms were detected and the color of the strawberry surface did not change significantly (P > 0.05). Residues of ClO2 and chlorite on strawberries after the treatment were 0.19 ± 0.33 mg ClO2 per kg and 1.17 ± 2.02 mg Cl2 per kg, respectively, whereas after 1 week of storage no ClO2 residues were detected and residual chlorite levels were down to 0.07 ± 0.12 mg Cl2 per kg. These results suggest that ClO2 gas treatment is an effective decontamination technique for improving the safety of strawberries while extending shelf life.

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