Mineral Modulated Single Atom Catalyst for Effective Water Treatment

2022 ◽  
pp. 2111565
Author(s):  
Xiongbo Dong ◽  
Zitong Chen ◽  
Aidong Tang ◽  
Dionysios D. Dionysiou ◽  
Huaming Yang
Keyword(s):  
Water Treatment ◽  
Single Atom ◽  
Effective Water

Cost-effective water treatment of polluted surface water by using direct filtration and granular activated carbon filtration

2002 ◽  
Vol 2 (1) ◽  
pp. 233-240 ◽  
Author(s):  
J. Cromphout ◽  
W. Rougge
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Treatment Process ◽  
Treatment Plant ◽  
Granular Activated Carbon ◽  
Cost Effective ◽  
Water Treatment Plant ◽  
Direct Filtration ◽  
Carbon Filtration ◽  
Effective Water

In Harelbeke a Water Treatment Plant with a capacity of 15,000 m3/day, using Schelde river water has been in operation since April 1995. The treatment process comprises nitrification, dephosphatation by direct filtration, storage into a reservoir, direct filtration, granular activated carbon filtration and disinfection. The design of the three-layer direct filters was based on pilot experiments. The performance of the plant during the five years of operation is discussed. It was found that the removal of atrazin by activated carbon depends on the water temperature.

scholarly journals Shedding of Escherichia coli O157:H7 in Dairy Cattle Housed in a Confined Environment following Waterborne Inoculation

2002 ◽  
Vol 68 (4) ◽  
pp. 1947-1954 ◽  
Author(s):  
J. A. Shere ◽  
C. W. Kaspar ◽  
K. J. Bartlett ◽  
S. E. Linden ◽  
B. Norell ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Water Treatment ◽  
Gel Electrophoresis ◽  
Pulsed Field Gel Electrophoresis ◽  
Escherichia Coli O157 ◽  
E Coli ◽  
Bull Calves ◽  
Genomic Dnas ◽  
Confined Environment ◽  
Effective Water

ABSTRACT A study of Escherichia coli O157:H7 transmission and shedding was conducted with bull calves housed in individual pens within a confined environment. For comparative purposes, the numbers and duration of E. coli O157:H7 shedding in naturally infected calves were monitored after a single purchased calf (calf 156) tested positive prior to inoculation. During the next 8 days, the calves in adjacent pens and a pen directly across a walkway from calf 156 began to shed this serotype O157:H7 strain. Five of the eight calves in this room shed this O157:H7 strain at some time during the following 8 weeks. The numbers of E. coli O157:H7 isolates shed in these calves varied from 60 to 105 CFU/g of feces, and the duration of shedding ranged from 17 to >31 days. The genomic DNAs from isolates recovered from these calves were indistinguishable when compared by using XbaI digestion and pulsed-field gel electrophoresis. Inoculation of calves with 1 liter of water containing ca. 103 to 104 CFU of E. coli O157:H7/ml resulted in shedding in 10 of 12 calves (trial 1, 4 of 4 calves; trial 2, 6 of 8 calves). The inoculated calves shed the inoculation strain (FRIK 1275) as early as 24 h after administration. The duration of shedding varied from 18 to >43 days at levels from 102 to 106 CFU/g of feces. The numbers of doses necessary to initiate shedding varied among calves, and two calves in trial 2 never shed FRIK 1275 after four doses (ca. 106 CFU per dose). Results from this study confirm previous reports of animal-to-animal and waterborne dissemination of E. coli O157:H7 and highlight the need for an effective water treatment to reduce the spread of this pathogen in cattle.

scholarly journals IL CONTRIBUTO DEI SERVIZI IDRICI INTEGRATI AL FABBISOGNO IRRIGUO DEI COMPRENSORI AGRICOLI: IL CASO DI MILANO

2017 ◽  
Author(s):  
Maurizio Brown
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Forage Production ◽  
Sewerage System ◽  
Xix Century ◽  
The City ◽  
Effective Water ◽  
Drainage Waters ◽  
Significant Model

During its history Milan city has been able to treasure its wastewater collected by Vettabbia irrigation ditch. Since the XII century, also thanks to Cistercensi (monks from Chiaravalle Abbey) great endeavour, the use of effusing the filthy waters from Vettabbia over the rotten lawns of a great and huge agricultural district, situated in the South the City, was going to become the most spread method used to regain the nutrients contained into the wastewaters and, at the same time, a great procedure to optimize the fresh forage production. During the second half of XIX century this technique was refined and made more efficient in order to allow the sustainable and ecofriendly disposal of the drainage waters raised from the new sewerage system of the City. Since 2004 Milan adopted an effective water treatment plant which permits the reuse of the purified waters for what concerns agriculture, becoming, in this field, the most significant model in Europe.

Progress and Research of Organic Polymeric Flocculant in Water Treatment

2011 ◽  
Vol 347-353 ◽  
pp. 707-710
Author(s):  
Yong Zhan ◽  
Yu Wang ◽  
Bin Dong
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
External Environment ◽  
Treatment Method ◽  
Development Trend ◽  
Organic Polymer ◽  
Key Factor ◽  
Polymer Flocculation ◽  
The Development Trend ◽  
Effective Water

coagulation and sedimentation method is an effective water treatment method, and the key factor is the choice of flocculant, according to its different chemical composition, it is generally divided into inorganic, organic, microbial flocculants. Because of the small dosage ,fast flocculation and less effect by external environment , organic polymeric flocculant has widely used in wastewater treatment. This paper describes some types of organic polymer flocculation and its research and application. finally,the development trend of organic polymeric flocculant was predicted.

scholarly journals Natural mineral modulated single atom catalyst for effective water treatment

2021 ◽  
Author(s):  
Xiongbo Dong ◽  
Zitong Chen ◽  
Aidong Tang ◽  
Dionysios Dionysiou ◽  
Yang Huaming
Keyword(s):  
Water Treatment ◽  
Environmental Remediation ◽  
Theoretical Calculations ◽  
Single Atom ◽  
Wastewater Reclamation ◽  
Natural Mineral ◽  
Highly Active ◽  
Porous Architecture ◽  
Optimal Coordination ◽  
Turn Over Frequency

Abstract Single atom catalysts (SACs) have been growing as an emerging “hot” topic in environmental remediation. Their performance can be rationally optimized via modulating spatial coordination configuration and porous structure of SACs, which is still challenging. Herein, a novel Si, N co-coordinated cobalt SACs (p-CoSi1N3@D) with 3D freestanding architecture was tailored via employing natural mineral (diatomite) as Si source and porous template. Theoretical calculations and experimental analysis reveal that Si substitution dramatically decreases electronegativity of CoN4 moieties and thus accelerates interaction and electron transfer between peroxymonosulfate and Co single atom center. Moreover, p-CoSi1N3@D inherits hierarchically porous architecture of diatomite, providing more accessible cobalt sites and open diffusion channels for peroxymonosulfate and contaminants in water treatment applications. Thanks to optimal coordination structure and porous architecture, p-CoSi1N3@D can serve as highly active catalyst toward peroxymonosulfate activation, with a turn-over frequency of 299.8 min− 1 for bisphenol A degradation, surpassing those of catalysts with transition metal SACs or oxides in disclosed literature. This work provides a novel vision for development of SACs towards wastewater reclamation.

Achieving reliable and cost effective water treatment

1996 ◽  
Vol 33 (2) ◽  
pp. 143-149 ◽  
Author(s):  
Amanda-Jane Egerton
Keyword(s):  
Water Treatment ◽  
Treatment Process ◽  
Minimum Cost ◽  
Cost Effective ◽  
Water Industry ◽  
Risk Of Failure ◽  
Levels Of Service ◽  
Risk Of Treatment ◽  
Effective Water ◽  
Overall Risk

There is increasing pressure from financial and quality regulators both to reduce costs and to improve levels of service within the water industry. It is possible to reduce costs to some extent without affecting levels of service unduly. However, there comes a time when further reductions have a major impact on the reliability of the treatment process and the reductions are no longer cost-effective. On examination, it is typical to find that the overall risk of treatment failure is dominated by a small number of significant problem areas or pinch-points within a system. Removal of these pinch-points through design or operational changes will lead to improvements in levels of service. Alternatively, if the pinch-points dominate the risk and cannot be removed cost-effectively, there is little point in over-protecting other areas through the inclusion of standby equipment or with unjustified levels of maintenance. Thus costs in these areas can be cut back without unduly increasing the overall risk of failure. This paper shows how risk analysis can be used to identify those areas of a system that dominate its risk of failure. This allows its design and operation to be optimised, thereby enabling levels of service to be met at minimum cost.

Roughing filtration as an effective pre-treatment system for high turbidity water

2011 ◽  
Vol 64 (7) ◽  
pp. 1419-1427 ◽  
Author(s):  
Zahiruddin Khan ◽  
Rahimuddin Farooqi
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Dose Requirement ◽  
Water Turbidity ◽  
Effluent Quality ◽  
Coagulant Dosage ◽  
High Turbidity ◽  
Pre Treatment ◽  
Effective Water

Effective water treatment is the prime goal of every water treatment facility. Chakwal Water Treatment Plant in Pakistan has been treating high-turbidity surface water through crude coagulation, sedimentation and slow sand filtration since the early 1980s. The process has always been tedious in terms of high coagulant dosage, large volumes of sludge and short filter runs especially after wet spells. A laboratory-scale study was conducted to see if roughing filtration, as the pre-treatment process, would help in reducing coagulant dose and sludge volume and improving effluent quality. Results indicated that up-flow rouging filtration with media grades decreasing in the direction of flow could reduce wet weather raw water turbidity (by more than 90%) and coagulant dose. Overall, the plant could save over US $54,000 annually in terms of coagulant cost only. Longer filter runs, improved product water quality leading to lower chlorine dose requirement, would be additional benefits.

Sign in / Sign up

Export Citation Format

Share Document