Study on Advanced Oxidation of Cafeteria Wastewater Using Fenton Reagent

2012 ◽  
Vol 424-425 ◽  
pp. 1322-1325
Author(s):  
Rong Jun Su ◽  
Peng Wang ◽  
Li Ming Jiang
Keyword(s):  
Treatment Process ◽  
Biological Process ◽  
Ph Value ◽  
Processing Conditions ◽  
Fenton Reagent ◽  
Land Occupation ◽  
Orthogonal Experiments ◽  
Reagent Treatment ◽  
Temperature And Pressure ◽  
Land Space

Fenton reagent was selected as oxidizers for the oxidation and degradation of cafeteria wastewater. The treatment effects were evaluated by the changes of COD and BOD5 parameters. The effects of Fenton reagent ratio, dosage of FeSO4•7H2O and pH value on wastewater treatment under normal temperature and pressure were investigated, the oxidation regularity is initially discovered as well. Orthogonal experiments were designed to optimize the processing conditions based on the single affected factor. The optimized controlling conditions for Fenton reagent treatment process is FeSO4•7H2O=1mmol/L, pH=3, H2O2/Fe2+=3.5:1, reaction time=60min. With Fenton reagent treatment the COD removal ratio was raised up to 94%. Compared with biological process, it saved land occupation and was more suitable for regions which lacked of land space.

Study on Different Advanced Oxidations of Cafeteria Wastewater

2012 ◽  
Vol 424-425 ◽  
pp. 1326-1329
Author(s):  
Rong Jun Su
Keyword(s):  
Reaction Time ◽  
Treatment Effects ◽  
Treatment Process ◽  
Cod Removal ◽  
Processing Conditions ◽  
Fenton Reagent ◽  
Orthogonal Experiments ◽  
Reagent Treatment

KMnO4 was selected as oxidizers for the oxidation and degradation of cafeteria wastewater. The treatment effects were evaluated by the changes of COD and BOD5 parameters. Orthogonal experiments were designed to optimize the processing conditions based on the single affected factor. The optimized controlling conditions for KMnO4 treatment process were KMnO4=0.3 mmol/L, pH=2, reaction time=60 minutes respectively. The COD removal ratios using KMnO4, ClO2, Fenton reagent treatment were 26%, 55% and 82% respectively. It showed that of Fenton was highest. But after its oxidation, it created other refractory substance and the produced sludge was also difficult to settle down. When using ClO2, the pH in process is closer to neutral, thus saved large quantity of acid. The treatment using KMnO4 showed there was little refractory precipitation, but its COD removal was too low.

Orthogonal Experiments for Kaolin Bleaching by Using Sodium Dithionite and Sulfuric Acid

2014 ◽  
Vol 968 ◽  
pp. 116-121
Author(s):  
Jin Tang Li ◽  
Xue Zeng ◽  
Chuan Hai Gan ◽  
Shi Qiu ◽  
Rong Yi Chen ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Great Improvement ◽  
Ph Value ◽  
Sodium Dithionite ◽  
Processing Conditions ◽  
Liquid Ratio ◽  
Bleaching Process ◽  
Orthogonal Experiments

The quality of the kaolin is always measured by iron contents since this element gives undesirable reddish color which limits the usage of this type of minerals. Reducing the iron contents to increase the value of kaolin by bleaching process is investigated. The effects of factors which can improve the whiteness of kaolin have been studied. The dosage of sodium dithionite, pH value, solid-to-liquid ratio and reaction time were chose as factors based on mono-factor experimental results. Orthogonal experiments were carried out and the optimum processing conditions of the reductive bleaching were obtained as the dosage of sodium dithionite 3%, pH 2, solid-to-liquid ratio 1:3 and reaction time 45min. After bleaching process described above, we obtained a great improvement in the whiteness from 69.93% to 81.31% and a decrease of Fe2O3 content from 0.52% to 0.40% of the kaolin.

Approach to the Reforms in Nightsoil Treatment Process Introduced Abroad

1991 ◽  
Vol 24 (5) ◽  
pp. 189-196 ◽  
Author(s):  
S. B. Guo ◽  
R. Z. Chen ◽  
G. Li ◽  
H. Y. Shoichi
Keyword(s):  
Treatment Cost ◽  
Treatment Process ◽  
Biological Process ◽  
Treatment Plant ◽  
Plant Performance ◽  
First Year ◽  
Original Design ◽  
Effluent Quality ◽  
Public Toilets

In 1987 Guangzhou Liede Nightsoil Treatment Plant started commissioning. The purpose of the plant is to dispose of 400 tons of nightsoi1 from city public toilets per day. In the first year of the commissioning a biological process was basically used according to the original design made by a Danish company. Practically it has been proved that the design is effective. The process can reduce BOD from 3800 mg/l to about 133 mg/l, or by approximately 96.5 percent. The performance of the sludge digester system is satisfactory. Because the primary investigation on characteristics of the nightsoil was insufficient there were some problems raised during the commissioning. So in the first year the effluent failed to achieve the desired quality. After the analysis of the plant performance some necessary reforms have been carried out. Now the effluent quality can stably meet the national discharge limits and the treatment cost decreases.

scholarly journals Sensitivity analysis of a municipal wastewater treatment plant model

2019 ◽  
Vol 252 ◽  
pp. 05010
Author(s):  
Paweł Król ◽  
Alberto Gallina ◽  
Michał Lubieniecki ◽  
Tadeusz Uhl ◽  
Tadeusz Żaba
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Process ◽  
Biological Process ◽  
Treatment Plant ◽  
Numerical Procedure ◽  
Municipal Wastewater Treatment ◽  
Wastewater Treatment Process ◽  
Plant Model ◽  
The Relationship

Waste management is a crucial process to keep the environment in wholesome conditions. The environmental impact of solid waste and wastewater is reduced through construction of appropriate disposal installations. The objective of wastewater treatment in biological reactors is to control the process of biomaterial growth by aerating the sewage content. The process is complex, as depending on a plenty of parameters. In the last decades an effective numerical model, called the Activated Sludge Model (ASM), has been proposed for describing the biological process. The ASM is implemented in the Benchmark Simulation Model (BSM) that simulates the whole wastewater treatment process. The most important parameters in ASM are the kinetic and stoichiometric coefficients. The former describes rate-concentration dependence. The latter characterises the relationship between the components of chemical reactions taking place in the cleaning process. Above parameters are determined by on-site calibration and their importance is relevant during the development of numeric models. This paper aims to examine the influence of kinetic and stoichiometric parameters on the wastewater treatment process of a plant in Płaszów, Kraków. The analysis is carried out by a sample-based numerical procedure. It highlights the ASM parameters playing a major role in the treatment process. Results obtained from the analysis are important for future validation and optimisation processes.

scholarly journals A study on municipal leachate treatment through a combination of biological processes and ozonation

2019 ◽  
Vol 276 ◽  
pp. 06030 ◽  
Author(s):  
Iva Yenis Septiariva ◽  
Tri Padmi ◽  
Enri Damanhuri ◽  
Qomarudin Helmy
Keyword(s):  
Treatment Process ◽  
Biological Process ◽  
Cod Removal ◽  
Batch Reactors ◽  
Biological Processes ◽  
Solid Waste Disposal ◽  
Leachate Treatment ◽  
Pre Treatment ◽  
Aerobic And Anaerobic ◽  
Post Treatment Process

Landfill is the most commonly method of municipal solid waste disposal in many countries. This practice has great potential to produce highly polluted leachate in massive quantities, which can cause environmental contamination. Biological processes are known as a common method to treat municipal leachate however this process alone in is less effective, especially in reducing the concentration of organic pollutants (BOD5/COD ratio). Leachate properties are site-specific and greatly influenced by landfill age. This study focuses on the investigation of treatment methods that can increase the extent of leachate biodegradability by applying an ozone concentration of 2.5 mg/L with up to 360 minutes of contact time. In this study, batch reactors were used and operated in anaerobic and aerobic conditions. The leachate used here represents both young and old leachate. Several treatment combinations were compared: Variation I (a combination of biologically aerobic and anaerobic process), Variation II (ozonation included as a pre-treatment process), and Variation III (ozonation was included as a post-treatment process). The results suggest that the BOD5/COD ratios of young and old leachates were 0.58 and 0.21, respectively. The COD removal for a young and old leachate treatment by biological process alone was 96.8% and 50.8%, respectively. Meanwhile, a combination of anaerobic-ozonation-aerobic processes gave better COD removal. Ozonation had a significant effect on the old leachate treatment, where the COD removal rose from 50.8% to 75%. Ozonation is a type of technology that can be applied to a subsequence treatment of biological processes in order to elevate the COD removal efficiency.

Influence of Processing Parameters on Surface Roughness in Micro Mill-Grinding Aluminium Alloy 6061

2014 ◽  
Vol 1017 ◽  
pp. 495-499
Author(s):  
Ya Dong Gong ◽  
Chao Wang ◽  
Jun Cheng ◽  
Xue Long Wen ◽  
Guo Qiang Yin
Keyword(s):  
Surface Roughness ◽  
Aluminium Alloy ◽  
Feed Rate ◽  
Processing Parameters ◽  
Micro Milling ◽  
Processing Conditions ◽  
Cutting Depth ◽  
Orthogonal Experiments ◽  
Alloy 6061 ◽  
Better Than

Orthogonal experiments of micro mill-grinding were conducted on aluminium alloy 6061. Electroplated CBN compound tools were used in machining. Surface topography and roughness of the machined workpieces were measured and analyzed. Influence rules of radial cutting depth,feed rate and spindle speed on surface roughness in micro mill-grinding were studied. The results were compared with those in micro milling. It shows that the influence rules of processing parameters on surface roughness in micro mill-grinding are approximately same with those in micro milling. And in the same processing conditions, the surface roughness of micro mill-grinding is better than that of micro milling. The minimum value of surface roughness Ra of micro mill-grinding is 0.609μm in the experiments.

Study on the Treatment of Dye Wasterwater Using Fenton Reagent

2012 ◽  
Vol 518-523 ◽  
pp. 3204-3207 ◽  
Author(s):  
Hui Tian ◽  
Ya Na Liu
Keyword(s):  
Degradation Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Methyl Violet ◽  
Ion Concentration ◽  
Fenton Reagent ◽  
Research Subjects ◽  
Ferrous Ions ◽  
Alizarin Red ◽  
Main Research

The methyl violet dye as the main research subjects. The concentration of H2O2, ferrous ion concentration, pH value and the type of dyes and so on be research the influence on the rate. The result shown: the greater dose of H2O2, the greater removal of methyl violet dye. when the dose of H2O2reach to a certain amount, keep increase the dose , but the increase was not obvious. In a certain concentration range, when the higher concentration of ferrous ions, the higher degradation rate of methyl viologen.When more than the certain concentration, the degradation rate began to decline. The removal efficiency is better when the ratio of ferrous ions and H2O2is 1:10..A large removal rate is controlled in the temperature of 20 to 60 as well as the pH is from 3 to 5. After changing the type of dye,beside the Alizarin Red,the removal of Methylene blue, Rhodamine, methyl violet are all high.

Study on Hair Dyeing Wastewater by Fenton Oxidation Method

2014 ◽  
Vol 522-524 ◽  
pp. 168-171
Author(s):  
Jun Yin ◽  
Wei Liu ◽  
Yan Kai ◽  
Wan Yao Wang ◽  
Liang Liang
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Organic Pollutants ◽  
Ph Value ◽  
Fenton Oxidation ◽  
Raw Water ◽  
Dyeing Wastewater ◽  
Fenton Reagent ◽  
Experimental Conditions ◽  
Oxidation Method

Hair dyeing wastewater is produced in coloring process. Its composition is complicated,in which contains a large number of organic pollutants and high color. Hair dyeing wastewater treatment can be effectively treated by Fenton oxidation method. The experiment results show that hair dyeing wastewater is treated by Fenton oxidation in this thesis. Fenton reagent is affected by hair dyeing wastewater, pH reaction time and many other factors. When raw water COD is 3800mg/L and chroma is 1210 times, by using Fenton oxidation method determine best experimental conditions: concentration of H2O2 is 24.5ml（30%H2O2), pH value is 3.0, nH2O2/nFe2+ is 7, reaction time is 60 min. Under the reaction condition , experimental results show that COD and color removal rates were 91.2% and 93.2% in hair dyeing wastewater by Fenton oxidation.

Synergetic Degradation of Enzyme-Fenton Reagent for Methyl Orange

2014 ◽  
Vol 1010-1012 ◽  
pp. 84-87
Author(s):  
Bin Yao ◽  
Zun Mian Xu ◽  
Cheng An Tao ◽  
Jian Fang Wang
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Ph Value ◽  
Uv Light ◽  
Degradation Efficiency ◽  
Optimum Conditions ◽  
Fenton Reagent ◽  
Effects Of Ph ◽  
Simulated Wastewater ◽  
Catalytic Effects

The effects of pH adjustment method, pH value, UV light, catalase and Fenton reagent on the degradation efficiency of enzyme-Fenton reagent for methyl orange (MO) were investigated, and the synergetic catalytic effects of catalase and Fenton reagent on the catalytic oxidation for methyl orange were found. When under no UV-light, the enzyme can enhance the degradation efficiency of Fenton reagent. The optimum conditions for degrading methyl orange simulated wastewater whose concentration is 0.1 g/L at room temperature are obtained as follows: the pH is tuned with H2SO4, pH is 3.0, concentration of catalase is 5 μg / mL, concentration of H2O2is 0.01%, concentration of FeSO4is 1.8μmol / L. The degradation rate can reach 98% in 60min. When under UV light at the same condition, the degradation rate can reach 94% in only 15min.

Study on the Treatment of Oil-Produced Wastewater Using the Combined Processes Including Advanced Oxidation

2014 ◽  
Vol 641-642 ◽  
pp. 390-393
Author(s):  
Yun Chong Li ◽  
Rong Jun Su ◽  
Yu Su ◽  
Feng Ying Zhang ◽  
Bing Jie Ye ◽  
...  
Keyword(s):  
Biological Process ◽  
Ph Value ◽  
Biochemical Property ◽  
Advanced Oxidation ◽  
Complex Salt ◽  
Combined Processes ◽  
Secondary Oxidation ◽  
Combined Process ◽  
Aluminum Complex ◽  
The Cost

It is difficult to be degraded by biological process for some oil-produced wastewater containing high content of oil, salt, and COD. The combined process including advanced oxidation was adopted to handle it in this paper. The combined process including adsorption by furnace ash, coagulation by complex of ferro-aluminum salt, Fenton advanced oxidation, alkali out by NaOH and Fenton secondary oxidation was determined. Considering both the treatment effect and the cost, the optimizing process is as follows, the slurry of ferro-aluminum complex salt of 9% (m/m) was as a coagulant with a dosage of 0.8% (v/v); pH value of 3.2,Fe2+/H2O2of 1/2.5(v:v) and 30 mmol/L dosage of FeSO4⋅7H2O was confirmed in advanced oxidation phase; NaOH was as precipitant with a dosage of 1%(m/m); Finally, after the secondary oxidation, the COD value greatly dropped from original 5 422 mg/L of raw oil-produced wastewater to 185.3 mg/L of effluent with a removal as high as 96.6%. It meets the national discharge standard on oil-produced wastewater. BOD5/ COD also rose from 0.23 to 0.39 which indicated an improved biochemical property.

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