Factors affecting the design of a pre-treatment system for a 1,200 m3/d RO plant in Riyadh, Saudi Arabia with an iron-rich, 60°C feed water

Desalination ◽  
1994 ◽  
Vol 96 (1-3) ◽  
pp. 397-408 ◽  
Author(s):  
K.J. McGlone ◽  
E.G. Darton ◽  
D.J. Langdown ◽  
A. Rahman
Keyword(s):  
Saudi Arabia ◽  
Treatment System ◽  
Feed Water ◽  
Factors Affecting ◽  
Pre Treatment

Performance of hybrid small wastewater treatment system consisting of jet mixed separator and rotating biological contactor

1997 ◽  
Vol 35 (6) ◽  
pp. 63-70 ◽  
Author(s):  
Yoshimasa Watanabe ◽  
Yoshihiko Iwasaki
Keyword(s):  
Wastewater Treatment ◽  
Electric Power ◽  
Hybrid System ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Treatment System ◽  
Municipal Wastewater Treatment ◽  
Wastewater Treatment System ◽  
Pre Treatment ◽  
Organic Particles

This paper describes a pilot plant study on the performance of a hybrid small municipal wastewater treatment system consisting of a jet mixed separator(JMS) and upgraded RBC. The JMS was used as a pre-treatment of the RBC instead of the primary clarifier. The treatment capacity of the system was fixed at 100 m3/d, corresponding to the hydraulic loading to the RBC of 117 L/m2/d. The effluent from the grid chamber at a municipal wastewater treatment plant was fed into the hybrid system. The RBC was operated using the electric power produced by a solar electric generation panel with a surface area of 8 m2 under enough sunlight. In order to reduce the organic loading to the RBC, polyaluminium chloride(PAC) was added to the JMS influent to remove the colloidal and suspended organic particles. At the operational condition where the A1 dosage and hydraulic retention time of the JMS were fixed at 5 g/m3 and 45 min., respectively, the average effluent water quality of hybrid system was as follows: TOC=8 g/m3, Total BOD=8 g/m3, SS=8 g/m3, Turbidity=6 TU, NH4-N=7 g/m3, T-P=0.5 g/m3. In this operating condition, electric power consumption of the RBC for treating unit volume of wastewater is only 0.07 KWH/m3.

Seawater biofiltration pre-treatment system: comparison of filter media performance

2013 ◽  
Vol 52 (34-36) ◽  
pp. 6325-6332 ◽  
Author(s):  
A. Shrestha ◽  
S. Jeong ◽  
S. Vigneswaran ◽  
J. Kandasamy
Keyword(s):  
Treatment System ◽  
Filter Media ◽  
Media Performance ◽  
Pre Treatment

scholarly journals Measuring Biofouling Potential in SWRO Plants with a Flow-Cytometry-Based Bacterial Growth Potential Method

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 76
Author(s):  
Nirajan Dhakal ◽  
Sergio G. Salinas-Rodriguez ◽  
Joshua Ampah ◽  
Jan C. Schippers ◽  
Maria D. Kennedy
Keyword(s):  
Flow Cytometry ◽  
Bacterial Growth ◽  
Potential Method ◽  
Absolute Number ◽  
Growth Potential ◽  
Added Value ◽  
Feed Water ◽  
Dissolved Air Flotation ◽  
Ultra Filtration ◽  
Pre Treatment

Measuring the bacterial growth potential of seawater reverse osmosis (SWRO) feed water is an issue that is receiving growing attention. This study developed and demonstrated the applicability of the flow-cytometry (FCM)-based bacterial growth potential (BGP) method to assess the biofouling potential in SWRO systems using natural microbial consortium. This method is relatively fast (2–3 days) compared to conventional bioassays. The effect of the potential introduction of nutrients during measurement has been studied thoroughly to achieve the lowest measure value of about 45,000 cells/mL, which is equivalent to about (10 µg-C glucose/L). The BGP method was applied in two full-scale SWRO plants that included (i) dissolved air flotation (DAF) and ultra-filtration (UF); (ii) dual-media filtration (DMF) and cartridge filter (CF), which were compared with the cleaning frequency of the plants. A significant reduction (54%) in BGP was observed through DAF–UF as pre-treatment (with 0.5 mg Fe3+/L), while there was a 40% reduction by DMF–CF (with 0.8 mg Fe3+/L). In terms of the absolute number, the SWRO feed water after DAF–UF supports 1.5 × 106 cells/mL, which is 1.25 times higher than after DMF–CF. This corresponds to the higher cleaning-in-place (CIP) frequency of SWRO with DAF–UF compared to DMF–CF as pre-treatment, indicating that the BGP method has an added value in monitoring the biofouling potential in SWRO systems.

Factors affecting the adhesion of micro-organisms to the surfaces of plant-parasitic nematodes

Parasitology ◽  
1989 ◽  
Vol 98 (1) ◽  
pp. 155-164 ◽  
Author(s):  
A. F. Bird ◽  
Ingrid Bonig ◽  
A. Bacic
Keyword(s):  
Meloidogyne Javanica ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Pasteuria Penetrans ◽  
Con A ◽  
Factors Affecting ◽  
Pas Staining ◽  
Pre Treatment ◽  
Micro Organisms ◽  
Dauer Larvae

SummaryThe influence of various agents on the adhesion of endospores of Pasteuria penetrans to the nematode Meloidogyne javanica was studied. Similarly, but to a lesser degree, we have also studied the adhesion of conidia of the fungus Dilophospora alopecuri and the coryneform bacterium Clavibacter sp. (syn. Corynebacterium rathayi) to the nematode Anguina agrostis (syn. A. funesta). Reduction in the degree of both spore and conidial attachment following their pre-treatment with periodate and the presence of PAS staining material on spores, conidia and bacteria implicated carbohydrate in these interactions. Tests involving both unbound and FITC-bound lectins demonstrated that wheat germ agglutinin (WGA) can inhibit the degree of attachment of P. penetrans to M. javanica and that this inhibition can be overcome by pre-treatment of the lectin with N, N′-diacetyl chitobiose. Endospores of P. penetrans, amphid and buccal secretions of 2nd-stage larvae of M. javanica and the cuticle and excretory pore secretions of 2nd-stage dauer larvae of A. agrostis bound WGA, indicating that accessible N-acetyl-D-glucosamine residues are present on these structures. Endospores of P. penetrans also bound Con A, indicating the presence of accessible α-D-glucose/α-D-mannose residues on their surface.

Measuring the Causes of Saudi Arabian Construction Accidents: Management and Concerns

2020 ◽  
Vol 10 (2) ◽  
pp. 108-14
Author(s):  
Majed M Moosa ◽  
Leo P. Oriet ◽  
Abdulrahman M Khamaj
Keyword(s):  
Saudi Arabia ◽  
Saudi Arabian ◽  
Safety Performance ◽  
Construction Sites ◽  
New Employees ◽  
Factors Affecting ◽  
Safety Issues ◽  
Construction Companies ◽  
Level Data ◽  
Construction Accidents

Introduction: Research indicate that construction site accidents are a global concern, and rates are rapidly increasing. In developing countries such as Saudi Arabia, safety issues are frequently ignored, and little is known about their causes. Objectives: This study aimed to shed light on factors causing accidents in Saudi Arabian construction companies. Methods: An online detailed survey, using Google Form, of accident features was distributed randomly to potential employees in 35 construction companies in Saudi Arabia, where one of the top administrators or safety officers were required to respond to the survey. It was conducted from 1st June to 31st August, 2013. The safety practices and perceptions of accident causes were assessed. Results: The response rate was 63%. Over half of the surveyed organizations encountered all of the selected accident types. While 19 (86%) of the construction companies maintained the equipment regularly, 15 (68%) had regular maintenance staff and 13 (59%) inspected the equipment before use. Although 18 (82%) of the workers were supplied with personal protective equipment (PPE), only 12 (55%) emphasized its use and offered site orientation for new employees.  In the last part of the survey, respondents were requested to rate 25 factors affecting safety performance at the construction sites on a scale of 1 to 5, with 5 being the most important. The three most important factors of poor safety performance were the firm's top leaders, a lack of training, and the reckless operation of equipment. Conclusion: Changing attitudes of surrounding safety culture have the potential to significantly improve safety outcomes in the Saudi Arabian construction industry. Two Saudi Arabian corporations, Saudi Aramco and Saudi Chevron Petrochemical provide a positive model for increasing construction safety in the country, but there is a paucity of industry-level data. Further scholarly attention is strongly indicated.

scholarly journals Factors Affecting The Use Of Information Communication Technology In Teaching And Learning In Saudi Arabia Universities

2021 ◽  
Vol 58 (1) ◽  
pp. 1012-1022
Author(s):  
Edrees A. Alkinani
Keyword(s):  
Machine Learning ◽  
Saudi Arabia ◽  
Educational System ◽  
Teaching And Learning ◽  
Resistance To Change ◽  
Digital Age ◽  
Structured Interview ◽  
Information Communication ◽  
Factors Affecting ◽  
Learning And Teaching

Technology and machine learning are becoming increasingly important in Saudi Arabia educational system. There is a growing demand for educational institutions to use machine learning to teach the skills and knowledge students need for the digital age towards Saudi Vision 2030. The integration and adoption ofdigital technologies into learning and teaching brings more opportunities for Saudi universities students and teachers to better embrace the globalized digital age. There is huge potential for the Saudi educational system to perceive the key role of digital technologies inenhancing the education process quality. The aim of this article is investigating the barriersthat affectteachers’ integration and adoptionof information communication technologies(ICT) in universityclassroom. The study adopted a qualitative research design to collect the data through the semi-structured interview. The sample of the study is four Saudi ICT-experts professors from four public universities in Saudi Arabia. The findings of the study showed that there are three types of barriers namely; teachers’ level barriers e.g. attitudes, knowledge, access, resistance to change. Technology level barriers e.g. compatibility, perceived of useful, institutional barriers. Institutional level e.g. leadership support, resources. The recommendation and suggestion for studies were suggested in light of the findings.

Mini pretreatment system integrated with micro pre-concentrator and micro GC column

Sensor Review ◽  
2017 ◽  
Vol 37 (2) ◽  
pp. 137-141 ◽  
Author(s):  
Yanni Zhang ◽  
Jianhai Sun ◽  
Xiaofeng Zhu ◽  
Jinhua Liu ◽  
Zhanwu Ning
Keyword(s):  
Design Methodology ◽  
Gas Mixtures ◽  
Treatment System ◽  
Gas Chromatograph ◽  
Content Type ◽  
Analytical Instruments ◽  
Portable Instruments ◽  
Pre Treatment ◽  
Walled Carbon Nanotubes ◽  
Limited Sensitivity

Purpose As the concentration of environmental samples was generally very low and existing analytical instruments had limited sensitivity, developing mini pre-treatment systems for effectively concentrating the components was very important and necessary. The purposed of this paper is to develop mini pretreatment system integrated with micro pre-concentrator and micro GC column. Design/methodology/approach In this work, a mini pre-treatment system integrated with a micro pre-concentrator and a micro gas chromatograph (GC) column was proposed. The micro pre-concentrator filled with single-walled carbon nanotubes as adsorbent materials was able to effectively concentrate the trace environmental sample, which dramatically improved the response of detectors. In addition, instead of conventional columns, micro GC columns were able to effectively separate gas mixtures, which are able to overcome low resolution and poor anti-interference ability of portable instruments. Findings The results demonstrated that the proposed pre-treatment system was able to concentrate the trace sample with a concentration factor of 15 and effectively separate the gas mixtures with a resolution over 1.5. Originality/value A mini pre-treatment system integrated with a micro pre-concentrator and a micro GC column was proposed.

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