Study on Treating Technology of Cr6+Wastewater by Direct Current (dc) Electro-Coagulation Method

Cr6+wastewater treatment by the self-designed the electric flocculation device has been investigated. This paper analyzed the factors such as the reaction time, reaction voltage, Electrode current, the electrolyte concentration, as well as Reaction pH on the effect of Cr6+wastewater treatment. Comparison of previous studies: Under neutral condition, reaction current was 4.5A,reaction voltage was 25V, electrolytic time was 25 minutes. After processing Cr6+down to concentration of 0.02mg/l, which reached the national sewage discharge standards (GB8978-2002).

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Transcranial Direct Current Stimulation Decreased Cognition-Related Reaction Time in Older Adults: A Systematic Review and Meta-Analysis

Ageing Research Reviews ◽

10.1016/j.arr.2021.101377 ◽

2021 ◽

pp. 101377

Author(s):

Joon Ho Lee ◽

Tae Lee Lee ◽

Nyeonju Kang

Keyword(s):

Systematic Review ◽

Older Adults ◽

Reaction Time ◽

Direct Current ◽

Transcranial Direct Current Stimulation ◽

Meta Analysis ◽

Direct Current Stimulation ◽

Related Reaction

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A systematic review of moving bed biofilm reactor, membrane bioreactor, and moving bed membrane bioreactor for wastewater treatment: Comparison of research trends, removal mechanisms, and performance

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.106112 ◽

2021 ◽

pp. 106112

Author(s):

Duduku Saidulu ◽

Abhradeep Majumder ◽

Ashok Kumar Gupta

Keyword(s):

Systematic Review ◽

Wastewater Treatment ◽

Membrane Bioreactor ◽

Research Trends ◽

Biofilm Reactor ◽

Moving Bed Biofilm Reactor ◽

Moving Bed ◽

Treatment Comparison ◽

Removal Mechanisms ◽

And Performance

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Photocatalytic Degradation of Naphthalene By UV/Zno: Kinetics, Influencing Factors and Mechanisms

Oriental Journal Of Chemistry ◽

10.13005/ojc/370108 ◽

2021 ◽

Vol 37 (1) ◽

pp. 65-70

Author(s):

Aram Dokht Khatibi ◽

Kethineni Chandrika ◽

Ferdos Kord Mostafapour ◽

Ali Akbar Sajadi ◽

Davoud Balarak

Keyword(s):

Wastewater Treatment ◽

Reaction Time ◽

Aqueous Solutions ◽

Aromatic Hydrocarbons ◽

Contact Time ◽

Initial Concentration ◽

Applied Study ◽

Batch System ◽

Initial Ph ◽

Conventional Wastewater Treatment

Conventional wastewater treatment is not able to effectively remove Aromatic hydrocarbons such as Naphthalene, so it is important to remove the remaining antibiotics from the environment. The aim of this study was to evaluate the efficiency of UV/ZnOphotocatalytic process in removing naphthalene antibiotics from aqueous solutions.This was an experimental-applied study that was performed in a batch system on a laboratory scale. The variables studied in this study include the initial pH of the solution, the dose of ZnO, reaction time and initial concentration of Naphthalene were examined. The amount of naphthalene in the samples was measured using GC.The results showed that by decreasing the pH and decreasing the initial concentration of naphthalene and increasing the contact time, the efficiency of the process was developed. However, an increase in the dose of nanoparticles to 0.8 g/L had enhance the efficiency of the process was enhanced, while increasing its amount to values higher than 0.8 g/L has been associated with a decrease in removal efficiency.The results of this study showed that the use of UV/ZnOphotocatalytic process can be addressed as a well-organized method to remove naphthalene from aqueous solutions.

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Research on the Preparation of Polyferric Silicate Chloride (PFSC) and Application on Algae Wastewater Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.154-155.230 ◽

2010 ◽

Vol 154-155 ◽

pp. 230-234 ◽

Cited By ~ 1

Author(s):

Li Ping Wang ◽

Xiao Fei Yan ◽

Xia Xu ◽

Ai Bin Xu ◽

Nai Yuan Gao

Keyword(s):

Wastewater Treatment ◽

Reaction Time ◽

Chlorophyll A ◽

Influencing Factors ◽

Sodium Silicate ◽

Silicic Acid ◽

Raw Materials ◽

Coagulation Performance ◽

Coagulation Mechanism ◽

Removal Efficiencies

A new polyferric silicate chloride(PFSC) was prepared by using sodium silicate, ferric chloride as raw materials, at the same time, its coagulation performance and the influencing factors were observed. The water containing algae was processed by PFSC coagulant and coagulation mechanism were discussed. The results showed that the best reaction time of PFSC preparation was 1h, temperature was 40°Cand Fe/Si mole ratio was 1. The removal efficiencies of chlorophyll a and turbidity were 82.40% and 94.97% respectively at 14mgFe•L-1 of dosage. Coagulation mechanism of PFSC is considered as the cooperation of oxidization/adsorption/charge-neutralization, adsorption-bridging and sweeping, which is the effect of silicic acid, iron and iron hydrolysate on the suspended particles in wastewater.

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