scholarly journals Pollutant and Microorganism Removal From Water by Hydrodynamic Cavitation

2016 ◽  
Vol 10 (1) ◽  
pp. 258-264 ◽  
Author(s):  
Zhimeng Liu ◽  
Mengfu Zhu ◽  
Cheng Deng ◽  
Hongbo Su ◽  
Ping Chen ◽  
...  
Keyword(s):  
Reaction Time ◽  
Water Treatment ◽  
Operating Temperature ◽  
Removal Rate ◽  
Water Disinfection ◽  
Hydrodynamic Cavitation ◽  
Experimental Conditions ◽  
Water Treatment Process ◽  
Treatment Processes ◽  
Microorganism Removal

Hydrodynamic cavitation can effectively remove organic pollutants and microorganisms from water. Organic compound degradation and water disinfection removal rate is related to reaction time and operating temperature. Removal rate can be improved by increasing the reaction time or raising the operating temperature. Under our experimental conditions, the removal rate of colority, COD and petroleum pollutants was 80.0%, 72.13% and 70.00%, respectively. In addition, Escherichia coli removal rate was higher than 99.99%. As a new water treatment process, hydrodynamic cavitation can be utilized alone or in combination with other water treatment processes, showing broad application prospects.

scholarly journals Natural agents as auxiliaries in water clarification: literature review and experimental evaluation

2020 ◽  
Vol 42 ◽  
pp. e44800
Author(s):  
João Paulo Nascimento Armeloni ◽  
Danieli Soares de Oliveira ◽  
Clainer Bravin Donadel
Keyword(s):  
Water Treatment ◽  
Literature Review ◽  
Removal Efficiency ◽  
Process Efficiency ◽  
Human Consumption ◽  
Agricultural Activity ◽  
Water And Wastewater Treatment ◽  
Turbidity Removal ◽  
Water Treatment Process ◽  
Treatment Processes

The increasing demand for water resources (primarily for human consumption and industrial and agricultural activity) is driven by socio-economic development, and population growth. Recent research has been focusing on alternative coagulants based on natural elements, as opposed to the commonly used iron and aluminum salts, for use in water and wastewater treatment processes. In this context, a thorough literature review on alternative coagulants and their application to water treatment processes has been conducted in this work. In addition, three experiments have been conducted with a widely used natural organic coagulant (Moringa oleifera). The alternative clarification system used is the helically coiled tube flocculator (HCTF), with high turbidity removal efficiency and low processing times. A comparative analysis of the turbidity reduction over time was performed with samples collected after 600, 900, 1200, 1500, 1800, 2100, 2400, and 2700 s from the hydraulic circuit. The process efficiency using the proposed alternative coagulant reached 95.3% (after 1800 s). The turbidity removal efficiency remained almost constant after 1800 s, with variations below 1%. These results prove that natural alternative agents can be powerful tools in the water treatment process, with efficiency values exceeding those obtained using chemicals (e.g., aluminum sulphate) as coagulant/ flocculant agents.

Study on the Model of Limonite-TiO2 Combined Microspheres Photolysising Phenol in Source Water

2012 ◽  
Vol 518-523 ◽  
pp. 121-124
Author(s):  
Hong Xia Xia ◽  
Qi Hong Zhu
Keyword(s):  
Reaction Time ◽  
Light Intensity ◽  
Ph Value ◽  
Removal Rate ◽  
Source Water ◽  
Quadratic Regression ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Orthogonal Regression ◽  
Single Factor Experiment

This paper investigates the effect of Limonite/TiO2 combined microspheres dosage,solution pH, reaction time,light intensity on the removal rate of phenol in source water.Based on the single factor experiment, the experimental conditions are optimized by quadratic regression orthogonal rotation combination design.The quadratic orthogonal regression model of removal rate of phenol(y) to four factors of Limonite/TiO2 combined microspheres dosage(x1),pH(x2),reaction time (x3)and light intensity (x4) is established as Y=88.64+4.43X1+ 6.69X3+3.75X4-4.79X12-13.20X22-4.21X32-2.69X42+8.06X1X2-6.76X1X3-4.45X1X4.It can conclude from the model that when Limonite/TiO2 combined microspheres dosage is 1.5583g,solution pH value is 4.5095,reaction time is 102.12min,light intensity is 1710.8（x10 lux）,the yield(y) reaches the maximal(95.83%) and consistent with the confirmatory experiment result..

Experimental Study on GAC-Sand Filter for Advanced Treatment in Drinking Water

2013 ◽  
Vol 726-731 ◽  
pp. 3044-3047
Author(s):  
Wan Chun Tan ◽  
Tao Wang ◽  
Yun Bo Wang ◽  
Shi Quan Sun ◽  
Chen Xue Yu
Keyword(s):  
Water Treatment ◽  
Treatment Process ◽  
Removal Rate ◽  
Nitrifying Bacteria ◽  
Advanced Treatment ◽  
Pilot Test ◽  
Chemical Safety ◽  
Sand Filters ◽  
Sand Filter ◽  
Water Treatment Process

A granular activated carbon sand dual media filter (GSF) was investigated as an advanced water treatment process of waterworks through the pilot test. The results show that the GSFs can remove organic matter in the water effectively instead of the sand filters. During the filtration,the effectiveness of CODMn elimination was effective, the average removal rate reached 48.2%. The average pH of the filtered water had dropped from 7.26 to 8.35, indicating that the alkaline environment is necessary for nitrifying bacteria to remain active. The ability of water treatment and quality could be raised and improve the chemical safety of the filtered water.

scholarly journals ENVIRONMENTAL IMPACT OF WATER TREATMENT PROCESS. A SYSTEMATIC REVIEW OF EVALUATION METHOD

2016 ◽  
Vol 22 (3) ◽  
pp. 34-39
Author(s):  
FLORINA FABIAN ◽  
VALENTIN NEDEFF ◽  
MIRELA PANAINTE -LEHADUS ◽  
OANA IRIMIA ◽  
SILVIA RACOVITA
Keyword(s):  
Systematic Review ◽  
Global Warming ◽  
Water Treatment ◽  
Environmental Impact ◽  
Carbon Footprint ◽  
Treatment Process ◽  
Environmental Indicators ◽  
Impact Categories ◽  
Water Treatment Process ◽  
Treatment Processes

In an international context in continuous development, water treatment processes become an important component of society where we live. Attention is directed on water treatment processes in the context of increasing water demand. This study proposes a systematic review of methods for the assessment of the environmental impact of Water Treatment process. The approach is based on the evaluation of LCA, Externalities Evaluation methodology and Carbon Footprint methodology, each of these methods have the environmental indicators able to relate direct and indirect emissions generated by any water treatment process. The present review compares and discusses the implementation of the above-cited methodologies to different case studies. The results in short show that Carbon Footprint only assesses the global warming potential of a water treatment plant, whereas Life Cycle Analysis and assess multiple environmental impact categories, which may include global warming, but also impacts on human health, ecosystems quality, etc. There are different standards and organizations around each assessment. The ExternE method on the contrary aims to quantify external impacts, from both economic and social points of view, to weight each endpoint of the impact categories.

Degradation of herbicides (ametryn and isoproturon) during water disinfection by means of two oxidants (hypochlorite and chlorine dioxide)

1997 ◽  
Vol 35 (4) ◽  
pp. 129-136 ◽  
Author(s):  
A. Lopez ◽  
G. Mascolo ◽  
G. Tiravanti ◽  
R. Passino
Keyword(s):  
Aqueous Solution ◽  
Reaction Time ◽  
Sodium Hypochlorite ◽  
Chlorine Dioxide ◽  
Hydrolysis Product ◽  
Water Disinfection ◽  
Experimental Conditions ◽  
Molar Ratios ◽  
Chemical Structures ◽  
Opposite Trend

The paper reports the results of an investigation aimed to find out the number and the chemical structures of byproducts which form during the reactions occurring in aqueous solution between two very common disinfectants, sodium hypochlorite (NaClO) and chlorine dioxide (ClO2), and two herbicides widely used in agriculture and frequently found in groundwaters: ametryn and isoproturon. Under controlled experimental conditions [T=20°C, pH=7, reaction-time = 48h, herbicide/disinfectant molar ratios: 0.05 and 0.05×10−2], ametryn reactions with chlorine dioxide much slower than with sodium hypochlorite, whereas the opposite trend has been observed for isoproturon. In any case, however, the higher the reagents concentration the faster the reactions. As for reaction byproducts, they have been detected by HPLC and identified by HPLC-MS. In particular, ametryn (R-S-CH3) reaction with NaClO gives rise to the consecutive formation of four derivatives: the sulphoxide (R-SO-CH3), the sulphone (R-SO2-CH3), the sulphonate ester (R-O-SO2-CH3) and its hydrolysis product (R-OH). Within the fixed reaction time (48h), ametryn reaction with ClO2 forms only the sulphoxide derivative (R-SO-CH3). As for isoproturon, it reacts with both oxidants forming aromatic-ring substituted derivatives. In particular, during the reactions with NaClO and ClO2, four and two (chlorinated and/or hydroxylated) derivatives are respectively formed.

Research on Micro-Electrolysis Method to Treat the Copper-Containing Electroplating Wastewater

2013 ◽  
Vol 864-867 ◽  
pp. 1560-1563
Author(s):  
Yi Ting Zhang ◽  
Hai Bo Lun
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Total Mass ◽  
Removal Rate ◽  
Mass Ratio ◽  
Experimental Conditions ◽  
Electroplating Wastewater ◽  
Initial Ph ◽  
Carbon Mass ◽  
Electrolysis Method

Iron-carbon micro-electrolysis was applied in the treatment of the electroplating wastewater containing copper, and the parameters that affected the efficiencies of the wastewater treatment had been discussed, The results indicated that the optimal experimental conditions were initial pH 4, stirring speed 100r/min, total mass of iron and carbon 4g/0.1L, iron carbon mass ratio of 1, reaction time was 40min. The removal rate of the Cu2+was 99% or more, the effluent can meet emissions standards

Micro-Flocculation - Film Processing Technology in Dealing with Beer Sterilized Wastewater

2013 ◽  
Vol 699 ◽  
pp. 279-283
Author(s):  
Jin Xiang Fu ◽  
Hui Liu ◽  
Rong Xin Zhang
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Heat Load ◽  
Treatment Process ◽  
Removal Rate ◽  
Turbidity Removal ◽  
Craft Beer ◽  
Treatment Processes ◽  
Membrane Treatment ◽  
Sterilization Effect

In order to improve beer sterilization effect of wastewater treatment, reduce the heat load of the sterilization wastewater on subsequent water treatment processes. In this paper, through optimizing transformation developed micro-flocculation -membrane treatment processes. Screening for the identification of inorganic polymeric aluminum ferric chloride flocculants as the technology. The best dosage was 15mg / L, the field test to verify the craft beer sterilized wastewater treatment effect. The results show that, micro flocculation membrane treatment process in the water after treatment of COD and turbidity removal rate is respectively 76% and 98%. To illustrate the use of this technology in the treatment of beer sterilizing water without two stage filtration, can effectively recycling sterilized wastewater.

Study on the Effect of Different Water Treatment Technology on Removing 2-MIB

2014 ◽  
Vol 587-589 ◽  
pp. 594-597
Author(s):  
Ping Xia ◽  
Dong Zhang ◽  
Zheng Wang ◽  
Hui Ye ◽  
Yu Qiong Shen ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Process ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Removal Rate ◽  
Pilot Test ◽  
Control Technology ◽  
Odor Control ◽  
Treatment Technology ◽  
Water Treatment Process

To compare the removal efficiency of 2-MIB by traditional water treatment, prechlorination, O3-BAC, MIEX pre adsorption and UV/H2O2 advanced oxidation process, the pilot-test of drinking water odor control technology were studied in this paper. The results showed that the traditional water treatment process had poor effect on removing 2-MIB, with about 10% removal rate, while the O3-BAC process was the best at removing 2-MIB, whose removal rate reached over 90%. And the 2-MIB removal rate of UV/H2O2 process was about 55% and that of prechlorination process was about 20%. However, the MIEX pretreatment process had almost no effect on removing 2-MIB.

Study on Preparation of Modified Nano-TiO2 and its Application in Photocatalytic Treatment Wastewater Containing Cd2+

2011 ◽  
Vol 347-353 ◽  
pp. 733-737 ◽  
Author(s):  
Xiao Cai Yu ◽  
Peng Fei Zhu ◽  
Yue Xia Chen ◽  
Jun Wang ◽  
Zong Fu An
Keyword(s):  
Reaction Time ◽  
Ph Value ◽  
Raw Materials ◽  
Removal Rate ◽  
Tetrabutyl Titanate ◽  
Photocatalytic Reaction ◽  
Nano Tio2 ◽  
Experimental Conditions ◽  
Cadmium Ions ◽  
Uv Excitation

Nano-Sn0.25Ti0.75O2 was prepared with hydrothermal method using tetrabutyl titanate as one of the primary raw materials. The products were characterized by XRD and SEM, which revealed that the crystal structure of Sn4+-doped nano-TiO2 is rutile, and the nanoparticles diameter was 14.49nm. Photocatalytic treatment the machining wastewater containing cadmium ions with the UV excitation by Nano-Sn0.25Ti0.75O2 was investigated. The experimental results show that Nano-Sn0.25Ti0.75O2 can be used as photocatalyst to removal Cd2+ from the wastewater effectively with the UV excitation. The wastewater pH value, the initial concentration of Cd2+, the amount of catalyst，the reaction time and other factors affect the efficiency of photocatalytic treatment significantly. The optimization experimental conditions for photocatalytic treatment wastewater containing cadmium ions are as follows, when the concentration of Cd2+ in the wastewater is 20mg/L, amount of Sn0.25Ti0.75O2 is 2g/L, pH in wastewater is 7 and the photocatalytic reaction time is 2h, the removal rate of Cd2+ from the wastewater is up to 98.4%.

Photocatalytic Degradation of Ammonia Nitrogen in Aquaculture Wastewater by Using Nano-TiO2

2011 ◽  
Vol 197-198 ◽  
pp. 774-779
Author(s):  
Peng Fei Zhu ◽  
Xiao Cai Yu ◽  
Qian Du ◽  
Kui Sheng Song ◽  
Zhong Hua He
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Volume Concentration ◽  
Volume Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Ammonia Nitrogen ◽  
Experimental Conditions ◽  
Aquaculture Wastewater

The nano-TiO2photocatalyst was prepared via sol-gel method, and the crystal structure and surface morphology were characterized by XRD and SEM. The photocatalytic degradation of ammonia-N in aquaculture wastewater was investigated by using nano-TiO2under UV irradiation. In the experiment, the effect of nano-TiO2dosage, ammonia-N initial concentration, pH value, H2O2volume concentration, and reaction time, respectively, on the removal of ammonia-N was investigated. On the basis of the results of these experimental data, an orthogonal array experimental design was used to select more efficient degradation condition. The optimal experimental conditions for photocatalytic degradation of ammonia-N can be stated as follows: when the concentration of ammonia-N was 20 mg/L, nano-TiO2catalyst dosage was 1.2 g/L, the pH value of solution was 5, H2O2volume fraction was 4 %, respectively, if the reaction time may last 3 h, the removal rate of ammonia-N was expected to reach 92.10 %.

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