Study on Advanced Treatment of Pulping and Papermaking Process Effluent by Immobilized Laccase

2011 ◽  
Vol 233-235 ◽  
pp. 712-715
Author(s):  
Sen Wang ◽  
An Long Zhang ◽  
Xin Ping Li ◽  
Zhao Rong Wang
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Rotation Speed ◽  
Orthogonal Test ◽  
Advanced Treatment ◽  
Single Factor ◽  
Optimum Conditions ◽  
Immobilized Laccase ◽  
Papermaking Wastewater

The lacasse was immobilized by sodium alginate for papermaking wastewater treatment. The influence of the important factors on the treatment effect was studied by single factor test; and the optimized condition of immobilized lacasse treating papermaking wastewater was investigated by orthogonal test. The result shows that the optimum conditions are pH4, reaction time is 24h, shaker rotation speed is 160r/min, and reaction temperature is 40°C. The decoloring rate reach 73.3%, the COD removing rate is more than67.2%, the average CODCr and chroma of the treated water respectively are 98.3mg/L and 45.4times, The quality of the final water not only can completely satisfies the new discharge standard, but also the recycle requirements.

Advanced Oxidation Treatment of Papermaking Wastewater by Homogeneous Fenton Reaction

2013 ◽  
Vol 726-731 ◽  
pp. 2510-2514 ◽  
Author(s):  
Hong Ping He ◽  
De Li Wu
Keyword(s):  
Removal Rate ◽  
Paper Industry ◽  
First Grade ◽  
Advanced Treatment ◽  
Treatment Processes ◽  
Quality Of Water ◽  
Optimum Reaction ◽  
Oxidation Technology ◽  
Papermaking Wastewater

The quality of water from traditional two-stage biochemical treatment process of papermaking wastewater cannot meet the pollutants discharge standard of paper industry,therefore it is necessary to develop new advanced treatment processes to further treat the effluent. This paper adopts the homogeneous Fenton oxidation technology to treat the effluent from a secondary sedimentation tank of a papermaking factory by batch experiments. The optimum reaction conditions are H2O2dosage 6.54mmol/L, FeSO4.7H2O dosage 200mg/L, pH=3, t=1.5h and of all the experiments the dosage of polyacrylamide is 3ppm. The COD of the treated water is under 50mg/L and its removal rate can reach as high as 75.4%, the chroma almost falls to zero, the effluent meets the first grade of the national wastewater discharge standard. Therefore, the homogeneous Fenton is an effective alternative for papermaking wastewater advanced treatment, due to its high effect.

Screening of Biosurfactant-Producing Bacteria

2013 ◽  
Vol 712-715 ◽  
pp. 515-519
Author(s):  
Jing Chun Wu ◽  
Liu Yang ◽  
Yang Zhao ◽  
Xiao Long Zhang
Keyword(s):  
Surface Tension ◽  
Interfacial Tension ◽  
Rotation Speed ◽  
Fermentation Medium ◽  
Orthogonal Test ◽  
Shaking Table ◽  
Optimum Conditions ◽  
Industrial Fermentation ◽  
Culture Flask ◽  
Metabolic Products

Firstly, two biosurfactant-producing bacteria named 1# and 2# was selected from 7 strains. Secondly, their growth and metabolism laws that the quantity of metabolic products would reach the highest and the value of surface tension would bottom out in the stationary phase of growth was found in the culture flask. Thirdly, the optimal condition for fermenting was chose by the orthogonal test which was used to study the effect of constituent of fermentation medium, culturing temperature and rotation speed of shaking table on the capability of metabolizing biosurfactants. Finally, compared the interfacial tension of strain 1# with that of strain 2# at the optimum conditions, strains 1# was chose for industrial fermentation.

scholarly journals Improvement of Tannase Production from Bacillus Bacteria by Submerged Fermentation of Spent Tea

2021 ◽  
Author(s):  
Rasha Al Haddad ◽  
Mohamad Tahla ◽  
Lina Al Amir
Keyword(s):  
Gallic Acid ◽  
Submerged Fermentation ◽  
Rotation Speed ◽  
Animal Feed ◽  
Statistical Design ◽  
Oil Industry ◽  
Optimum Conditions ◽  
Genus Bacillus ◽  
Hydrolysis Of

Tannase is an enzyme that causes hydrolysis of a group of tannins (gallo-tannins) to gallic acid and glucose. This enzyme is of importance due to its numerous applications in many fields, such as in the food industry by enhancing tea and coffee flavor and improving the quality of fruit juices rich in tannins. Tannase is also of importance in improving the quality of animal feed. Gallic acid is applied in the drug industry, and the production of antioxidants is used in the oil industry. This study was carried out to improve production of tannase from genus Bacillus using spent tea as a substrate by submerged fermentation and applying the statistical design Response Surface Methodology (RSM). Five parameters were considered, and each parameter was studied at five levels. They were temperature range (25 to 45˚C), pH (3–8), incubation period (24–120 hours), spent tea (0.5–2.5%) and rotation speed (100–300rpm). Results obtained revealed that optimum conditions for maximum production of tannase were: temperature at 35˚C, pH at 5, incubation time of 48 hours, spent tea concentration 1.5%, and rotation speed of 150 rpm. We recommend that further studies be carried out to clarify and determine the properties of crude and purified enzymes.

Experimental Research on the Advanced Treatment of Coking Wastewater by Patented Wastewater Treatment Equipment

2012 ◽  
Vol 599 ◽  
pp. 313-317
Author(s):  
Juan Wang ◽  
Ling Fei Fan ◽  
Di Fan
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Treatment Plant ◽  
Volume Ratio ◽  
National Standard ◽  
Municipal Sewage ◽  
Advanced Treatment ◽  
Optimum Process ◽  
Coking Wastewater ◽  
Treatment Equipment

In this study, we presented an approach to coking wastewater advanced treatment process with a patented wastewater treatment equipment. The samples were collected from the effluents of the biological treatment tank in a coking wastewater treatment plant. With the experiments of four static single factors and the continuing dynamic process, the discussions about the effects of pH value, influent loading, reaction time, and volume ratio on chromaticity, COD and NH3-N respectively were conducted. The experimental results identified that the optimum process parameters were pH of 3, influent load of 1m3/m2•h, reaction time of 4h and volume ratio of 2:1 respectively. When influents of chromaticity, COD and NH3-N were 210 times, 249.4mg/L, and 31.7mg/L respectively , the effluent of chromaticity, COD and NH3-N were 16 times, 49.7mg/L, and 9.5mg/L respectively, these values could meet the National standard of Recycling and Miscellaneous usages of Municipal Sewage on chromaticity, COD and NH3-N requirements.

Studies on Optimum Conditions of Synthesizing Theaflavins by Using Bio-Enzyme Method

2011 ◽  
Vol 138-139 ◽  
pp. 929-932
Author(s):  
Wan Ping Fang ◽  
Li Pu Wang ◽  
Jun Yu ◽  
Peng Xiang Yue ◽  
Xin Jiang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Ph Value ◽  
Total Content ◽  
Orthogonal Experimental Design ◽  
Single Factor ◽  
Optimum Conditions ◽  
Green Tea Powder ◽  
Enzyme Method ◽  
Optimum Reaction ◽  
Optimum Reaction Condition

Green tea powder and polyphenol oxidase extracted from eggplant has been used to explore the optimum condition for theaflavins synthesis under single factor and orthogonal experimental design. The results showed that pH value had significant effect on theaflavins synthesis. The optimum reaction condition was, under the temperature of 25°C, the system pH value 4.5, substrates concentration 2.5 g/L, and 35 mL crude enzyme with 196 U, reaction time 40 min, then the total content of theaflavins reached to 7.45 mg.

scholarly journals Biodiesel Production by Acid Methanolysis of Slaughterhouse Sludge Cake

Animals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1029
Author(s):  
Jung-Jeng Su ◽  
Yu-Chun Chou
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Methyl Esters ◽  
Acid Methyl Ester ◽  
Biodiesel Production ◽  
Sludge Cake ◽  
Sludge Waste ◽  
Acid Methanolysis ◽  
Treatment Facilities

Biosludge is a normal form of accumulating microbial populations inside the sewage or wastewater treatment facilities. Excessive sludge in the wastewater treatment basins has to be removed periodically to ensure good water quality of the effluent. This study aims to evaluate the feasibility of biodiesel production by transesterification of slaughterhouse sludge cake. The sludge cake was collected from a selected commercial slaughterhouse and transesterified with methanol, n-hexane, and acids (e.g., sulfuric acid or hydrochloric acid) at 55 °C. Three acid concentrations (2%, 4%, and 8%, v/v) in methanol under four reaction time periods (4, 8, 16, and 24 h) were applied. Results showed that the highest accumulated fatty acid methyl ester (FAME) yields of 2.51 ± 0.08% and 2.27 ± 0.09% were achieved when 8% (v/v) of H2SO4 or HCl were added in a 4 h reaction time, respectively. Methyl esters of palmitic acid (C16:0), palmitoleic acid (C16:1), stearic acid (C18:0), and oleic acid (C18:1n9c) were the major components of biodiesel from acid methanolysis of slaughterhouse sludge cake. Experimental and analytical results of acid methanolysis of slaughterhouse sludge cake showed that acid methanolysis of sludge cake was one of the feasible and practical options to recycle sludge waste and produce renewable energy.

Synthesis of Adipic Acid Using H4SiW6Mo6O40/TiO2-SiO2 as Catalyst

2014 ◽  
Vol 692 ◽  
pp. 326-331
Author(s):  
Fang Peng ◽  
Hui Zhao ◽  
Shui Jin Yang
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Adipic Acid ◽  
Orthogonal Test ◽  
Test Method ◽  
Impregnation Method ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Environmental Friendly ◽  
Orthogonal Test Method

A new environmental friendly catalyst, H4SiW6Mo6O40/TiO2-SiO2 was prepared by impregnation method, the synthesis of cyclohexanone 1,2-propanediol ketal was the probe reaction to optimize the synthetic condition of catalyst. The reactive condition of catalyst was optimized by orthogonal test method. The optimum conditions are n (TiO2): n (SiO2)= 3: 1, 20 % mass ratio of m (H4SiW6Mo6O40): m (TiO2-SiO2), the calcined time is 3 h and 300 °C of activated temperature. Using H4SiW6Mo6O40/TiO2-SiO2 as catalyst, adipic acid was synthesized from the oxidation of cyclohexanone by 30 % H2O2. Influences of dosage of H4SiW6Mo6O40/TiO2-SiO2, reaction temperature, volume of hydrogen peroxide and reaction time were discussed. Experimental results showed that H4SiW6Mo6O40/TiO2-SiO2 is a good catalyst for synthesis of adipic acid. When n (cyclohexene): n (H2O2): n (H4SiW6Mo6O40/TiO2-SiO2)= 100: 979: 0.04, reaction temperature is 130 °C and reaction time is 5 h, under the optimum conditions, the yield of adipic acid is 45.9 %.

Research on Oxidation of Phenanthrene to Phenanthrenequinone with TBHP

2013 ◽  
Vol 690-693 ◽  
pp. 1256-1260
Author(s):  
Ying Ji Luo ◽  
Zu Yu Liu
Keyword(s):  
Reaction Time ◽  
Butyl Alcohol ◽  
Orthogonal Test ◽  
Molar Ratio ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Technical Parameters ◽  
Tert Butyl ◽  
Preparation Conditions ◽  
Tert Butyl Alcohol

The oxidation of phenanthrene with TBHP into phenanthrenequinone has been studied. Reaction conditions were investigated by orthogonal test, and main technical parameters optimized. The optimum preparation conditions of TBHP were as follows: molar ratio of H2O2 to tert-butyl alcohol: 2:1; molar ratio of H2SO4 to tert-butyl alcohol: 0.4:1; reaction temperature: 60°C; reaction time: 4 h. And for the preparation of phenanthrenequinone the optimum conditions: molar ratio of TBHP to phenanthrene: 5:1; MoO2(acac)2 (catalyster) content: 0.05g(per 5g phenanthrene); reaction time: 4h.

Study on the Advanced Treatment of Dyeing Wastewater by Photocatalytic-H2O2

2014 ◽  
Vol 1048 ◽  
pp. 503-506
Author(s):  
Hui Xia Lan ◽  
Ping Ma ◽  
Jian Zhang ◽  
Hui Jie Li ◽  
Heng Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Removal Rate ◽  
Cod Removal ◽  
Advanced Treatment ◽  
Dyeing Wastewater ◽  
Biochemical Treatment ◽  
Emission Standard ◽  
Effect Of Ph ◽  
Cod Removal Rate

The composition of dyeing wastewater is complicated, after biochemical treatment, the effluent COD is still unable to meet the emission standard. To achieve discharge standard that often require advanced treatment after biochemical. This paper investigated effect of pH, reaction time, ZnO dosage, dosage of H2O2on the effect of dyeing wastewater treatment by photocatalytic-H2O2, the results showed that the reaction time of 15 min, pH of 4, dosage of ZnO was 4 g/L, 30% H2O2dosage was 1 ml/L, the COD removal rate was highest, can reach more than 55%.

Research on Determination and Preparation of Diphenic Acid

2013 ◽  
Vol 634-638 ◽  
pp. 112-116
Author(s):  
Zheng Qi ◽  
Zu Yu Liu ◽  
Jun Li Wang
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Peracetic Acid ◽  
Oxidation Reaction ◽  
Orthogonal Test ◽  
Molar Ratio ◽  
Optimum Conditions ◽  
Technical Parameters ◽  
Diphenic Acid

The oxidation of phenanthrene, with peracetic acid and by means of reaction distillation, into 2,2’-diphenic acid, and determination of phenanthrene, phenanthrenequinone and diphenic acid in the oxidation reaction mixtures, with a HPLC, have been studied. For the determination of phenanthrene, phenanthrenequinone and diphenic acid, the experimental results showed that the concentrations of the three components and their corresponding peak area presented good linear relationship. And for the oxidation, main technical parameters optimized by orthogonal test. The optimum conditions were as follows: molar ratio of phenanthrene to acetic acid: 1.0:25.0; molar ratio of phenanthrene to H2O2: 1.0:8.0; dropping time of 30%H2O2: 9h; reaction time:18h；solvent: benzene; reaction temperature: about 90°C(boil).

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