Pretreatment of Herbicides Production Wastewater by Spherical Micro-Electrolysis Media

2013 ◽  
Vol 295-298 ◽  
pp. 1079-1083 ◽  
Author(s):  
Ling Zhang ◽  
Jing Liang Xie
Keyword(s):  
Reaction Time ◽  
Biological Treatment ◽  
Low Cost ◽  
Good Effect ◽  
Post Processing ◽  
Reaction Conditions ◽  
Effects Of Ph ◽  
Optimum Reaction ◽  
The Cost ◽  
Operation Cost

[Objective] The aim is to study the pretreatment effect of herbicides production wastewater by spherical micro-electrolysis media. [Method] Spherical micro-electrolysis media is preferred for the pretreatment of herbicides production wastewater and effects of PH, amount of media and reaction time on the pretreatment was investigated. The change of pre- and post-processing herbicides production wastewater was determined; the operation cost was also analyzed. [Result]The optimum reaction conditions are as follows: the PH was 3; the amount of media was 1.0kg/L wastewater; and the reaction time was 3.0h. Under the optimum reaction conditions, the removal of COD, Chromaticity and TP reached 26.3%, 86.4% and 95.6% respectively; BOD5/COD varied from 0.10 to 0.35, and the biodegradability was improved greatly; the cost of pretreatment was 1.0yuan/t, and it was lower than that of electrolysis. [Conclusion] The pretreatment of herbicides production wastewater by spherical micro-electrolysis media has good effect, low cost and no soiling hardening, so it provides a good foundation for subsequent biological treatment.

Study on the Synthesis of Isoamyl Acetate Catalyzed by Strong Acidic Cation Exchange Resin

2011 ◽  
Vol 396-398 ◽  
pp. 2411-2415 ◽  
Author(s):  
Ping Lan ◽  
Li Hong Lan ◽  
Tao Xie ◽  
An Ping Liao
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Cation Exchanger ◽  
Cation Exchange Resin ◽  
Isoamyl Acetate ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Reaction Conditions ◽  
Optimum Reaction

Isoamyl acetate was synthesized from isoamylol and glacial acetic acid with strong acidic cation exchanger as catalyst. The effects of reaction conditions such as acid-alcohol ratio, reaction time, catalyst dosage to esterification reaction have been investigated and the optimum reaction conditions can be concluded as: the molar ratio of acetic acid to isoamylol 0.8:1, reaction time 2h, 25 % of catalyst (quality of acetic acid as benchmark). The conversion rate can reach up to 75.46%. The catalytic ability didn’t reduce significantly after reusing 10 times and the results showed that the catalyst exhibited preferably catalytic activity and reusability.

Catalytic Synthesis of Isoamyl Acetate Catalyzed by (NH4)6[MnMo9O32]•8H2O Supported Activated Carbon with Waugh Structure

2013 ◽  
Vol 781-784 ◽  
pp. 190-193
Author(s):  
Mei Xu ◽  
Hua Yuan ◽  
Wei Liu ◽  
Jian Wang ◽  
Feng Zhen Yang
Keyword(s):  
Acetic Acid ◽  
Activated Carbon ◽  
Reaction Time ◽  
Conversion Rate ◽  
Isoamyl Alcohol ◽  
Isoamyl Acetate ◽  
Catalytic Synthesis ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Optimum Reaction

The synthesis of isoamyl acetate with ammonium 9-molybdate manganese heteropolyacid salt supported activated carbon as catalyst was studied. The optimum reaction conditions are obtained as follows: isoamyl alcohol to acetic acid molar ratio = 1.646, the weight of catalyst is 40% of total weigh, m (acidulate catalyst)=0.2g, m (water carrying reagent toluene) = 3ml, reaction time is about 63 minutes. Selectivity is 100% and conversion rate is 89.48%.

Removal of ammonium as struvite using magnesite as a source of magnesium ions

2010 ◽  
Vol 5 (1) ◽  
Author(s):  
H. M. Huang ◽  
X. M. Xiao ◽  
L. P. Yang ◽  
B. Yan
Keyword(s):  
Reaction Time ◽  
Reaction Rate ◽  
Low Cost ◽  
Magnesium Ions ◽  
Batch Experiments ◽  
Optimum Conditions ◽  
Ammonium Removal ◽  
Time Required ◽  
Solid Liquid ◽  
Operation Cost

In this study, magnesite was used as a low-cost magnesium source to remove ammonium as struvite from the wastewater generated in the rare-earth elements separation process. Since the solubility of magnesite is low, before it was used it was decomposed to magnesia which has a higher reaction rate than magnesite. To optimize its usage, the optimum temperature of decomposition of magnesite and the time required for the process were determined by batch experiments to be 700 °C and 1.5 h, respectively. Besides, batch experiments using the residues of magnesite decomposed under optimum conditions were undertaken to investigate the effects of solid (magnesite)/liquid (wastewater) ratio and reaction time on ammonium removal as struvite. Results indicated that for the solid/liquid ratios tested and for a reaction time of 6 h, phosphorus concentrations fell steeply from the initial 9105 mg/L to a range of 198.8–29.8 mg/L, and ammonium concentrations from the initial 5287 mg/L to 540–520 mg/L. An economic analysis conducted indicated that the operation cost of the struvite process could be reduced by about 34% using decomposed magnesite instead of pure MgCl2.

The influence of laccase/histidine system on the properties of OCC pulp fibers, and of handsheets made thereof

2019 ◽  
Vol 34 (2) ◽  
pp. 211-217
Author(s):  
Yangmei Chen ◽  
Yiqian Mai ◽  
Qitang Wu ◽  
Jiaqian Kang ◽  
Yu Jiang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Physical Properties ◽  
Control Sample ◽  
Pulp Fibers ◽  
Reaction Conditions ◽  
Paper Making ◽  
Recycled Fiber ◽  
Optimum Reaction ◽  
Enzyme Dosage ◽  
Resource Shortage

Abstract For improving the physical properties of old corrugated container (OCC) fiber, the laccase/histidine system was used in this paper. Firstly, the paper studied the optimum conditions that the laccase/histidine system modified the OCC fiber, including enzyme dosage, histidine dosage, reaction time, reaction temperature, and pH. Experimental results showed that the optimum reaction conditions of laccase/histidine system for OCC pulp were: dose of enzyme 1 U·{\text{g}^{-1}}, 4 h reaction time, pH 4.5, dose of histidine 1 %. Under the optimum reaction conditions, the tensile and burst indexes of the sheet made from laccase/histidine treatment were increased by 25.2 % and 34.0 %, compared with that of the control sample. The SEM results showed that compared with the control sample, the fibrillation of the fiber modified with laccase/histidine was more obvious. Finally, the content of acid-insoluble lignin of the fiber was determined. The content of acid-insoluble lignin of the control sample was 29.2 %, and the content of acid-insoluble lignin of the fiber treated by laccase/histidine system in optimum reaction conditions was 16.0 %, which decreased by 13.2 %. Laccase/histidine system could improve the physical properties of recycled fiber, alleviate fiber decay, which are of great significance to solve the resource shortage and environment pollution of the paper-making industry.

OBTENCIÓN DE BIODIESEL POR TRANSESTERIFICACIÓN ALCALINA A PARTOR DE ACEITES VEGETALES RESIDUAL EN LIMA

2016 ◽  
Vol 26 (1) ◽  
pp. 107
Author(s):  
Linda N. Zavaleta Palomino
Keyword(s):  
Reaction Time ◽  
Potassium Hydroxide ◽  
Kinematic Viscosity ◽  
Acid Number ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Maximum Conversion ◽  
Optimum Reaction ◽  
Optimum Production ◽  
Do So

RESUMEN El objetivo de esta investigación es conocer el proceso de producción óptimo para generar biodiesel, por transesterificación alcalina, a partir de aceites vegetales residuales de los restaurantes del distrito de San Borja, Lima- Perú. Para ello, se analizó el aceite vegetal residual recolectado, se determinó la concentración de metanol (%v/v), la concentración de hidróxido de potasio (%p/p), el tiempo de reacción óptimo, y por último se determinó la calidad del biodiesel producido.Los resultados mostraron que es posible realizar biodiesel con el aceite recolectado, ya que su grado de acidez (1,56%) fue inferior al 3%. Las condiciones óptimas para lograr la máxima conversión de la reacción se obtuvieron cuando se usó una concentración de metanol del 30%, una concentración de hidróxido de potasio del 0,4% respecto al peso del aceite y un tiempo de reacción de 3 hrs 30 min a una temperatura constante de 60°C. Bajo estas condiciones se obtuvo un rendimiento de biodiesel del 85,97%. Al biodiesel obtenido bajo las mejores condiciones de reacción se le analizaron cuatro propiedades del combustible, encontrándose que la viscosidad cinemática fue 5,5 cSt, el número de acidez fue 0,68 mgKOH/g, la ceniza sulfatada fue 0,0478 % y el carbón conradson fue 0,142%.Palabras claves.- Transesterificación alcalina, grado de acidez, máxima conversión número de acidez, viscosidad cinemática, ceniza sulfatada, carbón conradson y postratamiento del biodiesel. ABSTRACT In this paper, it is presented an experiment carried out with the objective of knowing the optimum production process in order to generate bio diesel by alkaline transesterification, from residual vegetable oils from the Restaurants in San Borja. In order to do so, first of all of the residual vegetal oil collected was analyzed, then it was determined the concentration of methanol (%v/v), the concentration of potassium hydroxide (%p/p) and the optimum reaction time, and lastly, it was determined the bio diesel quality produced.The results showed that it is possible to generate biodiesel from the collected oil, due to its grade of acidity (1,56%) was lower than 3%. The optimum conditions to get the maximum conversion of the reaction were achieved when it was used a methanol concentration of 30%, a concentration of potassium hydroxide of 0,4% regarding the weight of the oil and a reaction time of 3:30 minutes at a constant temperature of 60%. Under these conditions it was obtained a performance of biodiesel of 85,97%. Biodiesel obtained under the best reaction conditions will be analyzed four fuel properties, finding that the kinematic viscosity was 5,5 cSt, the acid number was 0,68 mg KOH / g, the sulfated ash was 0,0478% and Conradson Carbon was 0,142%. Key Words.- Alkaline Transesterification, grade of acidity, maximum conversion, number of acidity, kinematic viscosity,    sulfated ash, conradson carbon and after treatment of biodiesel

Preparation and Electrospinning of Acidified-Oxidized Potato Starch

2012 ◽  
Vol 535-537 ◽  
pp. 2340-2344 ◽  
Author(s):  
Hong Jie Wang ◽  
Xin Jin ◽  
Wen Yu Wang ◽  
Chang Fa Xiao ◽  
Lin Tong
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Optimum Condition ◽  
Potato Starch ◽  
Ammonium Persulfate ◽  
Modified Starch ◽  
Oxidizing Agent ◽  
Reaction Conditions ◽  
Native Starch ◽  
Optimum Reaction

This paper investigates the preparation and electrospinning of acidified-oxidized potato starch. In this article, acidified-oxidized potato starch was prepared by adding ammonium persulfate as an oxidizing agent and hydrochloric acid as a catalyst. The effect of reaction time, temperature, the concentration of hydrochloric acid and the content of ammonium persulfate on the viscosity and content of carboxyl were discussed. The optimum reaction conditions were as follows: 1.5 hours ,50°C, 0.5mol/l HCl, 2.5% (NH4)2S2O8. And then, the acidified-oxidized potato starch prepared at the optimum condition was dissolved in dimethyl sulfoxide (DMSO) to be electrospinned by contrast to native starch. Electrospinning of 5wt%-21wt% of modified starch in DMSO produced beads, beaded fibers, and smooth fibers, depending on the concentration range. Smooth fibers were observed until the concentration reached 19wt%, while native starch was 5wt%.

Improvement of Foaming Properties of Whole Egg Powder through Maillard Reaction

2012 ◽  
Vol 554-556 ◽  
pp. 1091-1094 ◽  
Author(s):  
Cui Yu ◽  
Yu Jie Chi ◽  
Wei Xu ◽  
Lei Lv ◽  
Chen Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Reaction Time ◽  
Maillard Reaction ◽  
Weight Ratio ◽  
Foaming Properties ◽  
Reaction Conditions ◽  
Sh Groups ◽  
Optimum Reaction ◽  
Egg Powder ◽  
Whole Egg

In attempt to improve foaming properties of whole egg powder(WEP), WEP proteins were covalently attached to polysaccharide (maltodextrin) in a controlled aqueous solution through Maillard reaction. The optimum reaction conditions were as follows: reaction temperature was 50°C, reaction time was 120min, the weight ratio of maltodextrin:protein was 8‰. After modification, the foaming ability (FA) of WEP increased from 62.96% to 86.05%, the foaming stability(FS) increased from 20.67% to 38.97%. As the reaction proceeded, hydrophobicity and Surface SH groups increased, total SH groups and vailable lysine contents of M-WEP decreased. This results demonstrated that the Maillard reaction partially unfolds and polymerizes proteins of M-WEP and, consequently, improved foaming properties of WEP under certain controlled conditions.

Chitosan Metal Complex: An Artificial Metalloprotease Hydrolyzing Trypsin Inhibitor from Soybean

2012 ◽  
Vol 430-432 ◽  
pp. 414-418
Author(s):  
Peng Liang ◽  
Dong Feng Wang ◽  
Xing Yu Wang ◽  
Mei Ding ◽  
Li Zhang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Metal Complex ◽  
Metal Complexes ◽  
Trypsin Inhibitor ◽  
Rate Constants ◽  
Proteolytic Enzymes ◽  
Protein Cleavage ◽  
Reaction Conditions ◽  
Sds Page ◽  
Optimum Reaction

Most popular agents for protein cleavage are proteolytic enzymes, but they require more rigorous hydrolytic conditions, and it is very difficulty to separate them from the productions. In this paper, an new artificial metalloprotease, Cu(II) complex of cyclen (Cu(II)Cyc) using chitosan as supporter, was designed and synthesized successfully. The hydrolytic efficient under different conditions was measured and confirmed with HPLC, SDS-PAGE, further more. Some reaction conditions, such as pH, temperature, were researched, and the results show that the optimum reaction time was 48 h, temperature was 60 °C respectively, The observed rate constants for trypsase inhibitor cleavage was 1.006×10-2 h-1 under above conditions, and the observed rate constants was 2.120×10-2 h-1 when the pH was 9.0. This paper suggested that the chitosan metal complexes could efficiently accelerate the hydrolysis reaction.

scholarly journals Recent Advancement on Ferrite Based Heterojunction for Photocatalytic Degradation of Organic Pollutants: A Review

2021 ◽  
pp. 121-161
Author(s):  
P. Shandilya
Keyword(s):  
High Stability ◽  
Large Scale ◽  
Low Cost ◽  
Magnetic Behavior ◽  
Aqueous System ◽  
Water Remediation ◽  
Type Ii ◽  
Reaction Conditions ◽  
Synthetic Routes ◽  
The Cost

The progress of ferrites and ferrites-based nanocomposites has become extensively popular in the field of photocatalytic wastewater treatment. This class of compound exhibit several fascinating properties related with their high stability, low cost, ease of functionalization, and biocompatibility. Ferrites carry outstanding magnetic behavior that helps in their easy recovery from the aqueous system thus reducing the cost. The morphology and various properties such as magnetic, absorption, optoelectronic of magnetic ferrites can be varied and optimize by applying different synthetic routes and reaction conditions. With this background we have briefly presented and reviewed the latest development in the field of photodegradation of aqueous pollutants using ferrites based heterojunction. Especially, the type-II, Z-scheme and S-scheme based heterojunction for enhanced pollutant degradation under the exposure of light are thoroughly describe. Ferrites have inherent potential in water remediation applications hence many examples were consider to impart valuable knowledge to the readers. Nevertheless, the large-scale utilization of these magnetic nanoparticles still needs to be explored. Therefore, the gaps, challenges and future prospective of ferrites nanoparticles are also explained to unveil the un-scrutinized standard of ferrites nanoparticles.

scholarly journals Design, fabrication and testing of banana fibre extraction machine

2019 ◽  
Vol 2 (1) ◽  
pp. 165-173
Author(s):  
Sachin Poudel ◽  
Sushil Chapai ◽  
Raj Kumar Subedi ◽  
Tark Raj Giri ◽  
Sunil Adhikari
Keyword(s):  
Production Efficiency ◽  
Low Cost ◽  
Fibre Production ◽  
Agricultural Products ◽  
Combined Application ◽  
The World ◽  
Banana Fibre ◽  
Long Time ◽  
The Cost ◽  
Operation Cost

Banana (Musa paradisiacal L) is the fourth most important crop in the world after rice, wheat and maize. Banana cultivation in Nepal is more popular like other agricultural products and has annual fibre production of about 1,977 tons. The thick, fleshy and fibrous pseudo stems that are left over after harvesting the bananas can be used to extract high quality fibre. Farmers usually throw away this whole stump because it is big and heavy and takes a long time to rot and the animals do not eat it. The cost of importing extraction machine from other country is expensive. The research and development of such machine with low cost, which ultimately provides opportunity of local entrepreneurship to farmers and helps in proper utilization of agricultural management, was felt necessary. The developed machine from this project, uses combined application of roller and a decorticator for fibre extraction. The machine can extract fibre from 1,648 Kg of input which is about 100-160 banana pseudostem. The fibre production obtained was 54 Kg per day with NRS. 11 operation cost per 1 Kg of fibre. The production efficiency in comparison to available commercial machine is 180 %.

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