Removal of p-arsanilic acid and phenylarsonic acid from water by Fenton-coagulation process: influence of substituted amino group

2021 ◽  
Author(s):  
Qiang Peng ◽  
Wenze Xu ◽  
Weixiao Qi ◽  
Chengzhi Hu ◽  
Huijuan Liu ◽  
...  
Keyword(s):  
Emerging Contaminants ◽  
Ph Value ◽  
Inorganic Arsenic ◽  
Amino Group ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Arsanilic Acid ◽  
Coagulation Process ◽  
Coagulation Performance ◽  
Phenylarsonic Acid

Abstract Phenylarsonic acid compounds, which were widely used in poultry and swine production, are emerging contaminants due to their considerable solubility in water and the highly toxic inorganic arsenic species forming potential during their biotic and abiotic degradation in the natural environment. Herein, we investigated the optimal conditions to treat typical organoarsenic contaminants ( p -arsanilic acid ( p -ASA) and phenylarsonic acid (PAA)) in aqueous solution based on Fenton-coagulation process for oxidizing them and capturing the released inorganic arsenic, and elucidated the influence mechanism of substituted amino group on removal. Results showed that the pH value and the dosage of H 2 O 2 and Fe 2+ significantly influenced the performance of the oxidation and coagulation processes. The optimal conditions for removing 20mg L -1 -As in this research were: 40mg L -1 Fe 2+ and 60mg L -1 H 2 O 2 (the mass ratio of Fe 2+ /H 2 O 2 = 1.5), initial solution pH of 3.0 and final solution pH of 5.0 adjusting after 30 min Fenton oxidation reaction. Meanwhile, the substituted amino group observably influence the oxidation and coagulation performance of phenylarsonic acid compounds. Amino group could make phenylarsonic acid compounds more easily be attacked by ·HO and supply more binding sites for forming complexes with Fe 3+ hydrolysates, resulting in higher oxidation rate and better coagulation performance.

Study on the Removal Effect of Chromium(VI) in Wastewater by Rice Husk

2014 ◽  
Vol 1073-1076 ◽  
pp. 825-828 ◽  
Author(s):  
Xue Min Dai ◽  
Shu Na Wang ◽  
Xia Wang
Keyword(s):  
Particle Size ◽  
Rice Husk ◽  
Ph Value ◽  
Removal Rate ◽  
Experimental Studies ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Adsorption Time ◽  
Chromium Vi

Rice husk was used as an adsorbent to study the adsorption of Cr (VI) from wastewater, Based on the experimental studies on influences of the particle size of rice husk, solution pH value, adsorption time, temperature and rice husk dose, the optimal conditions of the adsorption were determined as follows: temperature of 35°C, pH of 2, the particle size of rice husk in the range of 80-100 mesh, adsorption time of 3h, dose of 30g/0.2g. Under the optimal conditions, the removal rate of chromium from wastewater by rice husk can reach 91%.

scholarly journals Study on the removal of high contents of ammonium from piggery wastewater by clinoptilolite and the corresponding mechanisms

2019 ◽  
Vol 17 (1) ◽  
pp. 1393-1402
Author(s):  
Liu Nan ◽  
Li Yingying ◽  
Li Jixiang ◽  
Ouyang Dujuan ◽  
Wang Wenjuan
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Ph Value ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Piggery Wastewater ◽  
Column Study ◽  
Ammonium Removal ◽  
Ammonium Adsorption ◽  
Pseudo Second Order

AbstractIn this study, a clinoptilolite was applied to remove ammonium from piggery wastewater. The performance of ammonium removal and the correspondingly mechanisms were discussed. Under the optimal conditions of clinoptilolite dosage of 12 g/L, solution pH value of 8.3, shaking speed of 280 rpm and contact time of 55 min obtained by using response surface methodology (RSM), 19.7 mg of ammonium can be adsorbed onto 1 g of clinoptilolite, which was declined when metal cations were presented in the piggery wastewater. The ammonium adsorption process by the clinoptilolite can be well fitted by Langmuir isotherm with a spontaneous nature and pseudo–second–order kinetics model. Furthermore, column study showed that to some extent, the increased flow rate was beneficial to the removal of ammonium, and the ammonium adsorption capacity of clinoptilolite in column study was much higher than those in batch study.

Removal of Perfluorooctanoate from Water by Polyaluminium Chloride Coagulation

2012 ◽  
Vol 610-613 ◽  
pp. 1784-1788
Author(s):  
Liu Yang ◽  
Li Zhao ◽  
Peng Yu Liu ◽  
Zong Shuo Li ◽  
Qing Chang
Keyword(s):  
Ph Value ◽  
Removal Rate ◽  
Mixing Time ◽  
Model Solution ◽  
Neutral Solution ◽  
Solution Ph ◽  
Polyaluminum Chloride ◽  
Ph Values ◽  
Coagulation Process ◽  
Slow Mixing

The removal of perfluorooctanoate （PFOA） and turbidity from model solution by coagulation was investigated. A polyaluminum chloride (PACl) was used as a coagulant in the coagulation process. The effects of coagulant dose, slow mixing time, solution pH value and initial turbidity on the removal of both PFOA and turbidity from water were studied. It was found that the removal rate of PFOA in water increase along with the increase in slow mixing time, initial turbidity and PAC dose. The removal rate of PFOA is more effective at the near neutral solution pH values and the high initial turbidity. The removal percents of PFOA exceed 80% at the optimal condition. The removal mechanism was speculated to be the electrostatic interaction and hydrophobic interaction in coagulation process.

Research on Microbial Degradation of Bamboo Lignin for Extraction of Natural Bamboo Fiber

2013 ◽  
Vol 650 ◽  
pp. 273-278
Author(s):  
He Li ◽  
Guo Ying Zhou ◽  
Jian Liu ◽  
Sheng Jie Wang
Keyword(s):  
Microbial Degradation ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Bamboo Fiber ◽  
Ammonium Tartrate ◽  
Optimal Conditions ◽  
Buffer Solution ◽  
Solution Ph ◽  
Natural Bamboo Fiber ◽  
Liquid Quantity

This study optimizes on the technological conditions for extraction of natural bamboo fiber by means of microbial degradation of bamboo lignin. Results show that by the orthogonal experiment, we have studied out optimal conditions for combining three strains with fermentation to produce enzyme: 10.0 g/L glucose, 0.2 g/L ammonium tartrate, 4.5 buffer solution pH value and 20.0/250 ml loading liquid quantity. In these above four factors, the primary and secondary factors affecting enzyme production are: carbon source > pH value > loading liquid quantity > nitrogen source. Meanwhile, the experiment has studied the influence of single factor on lignin degradation: at the temperature of 37 °C, about 4 x 107spore concentration, adding 1.5 mg/L veratryl alcohol and introducing air at the efflux rate of 1 L/min are bamboo crude fiber optimal conditions for microbial selective degradation of lignin.

scholarly journals An Effective Flocculation Method to the Kaolin Wastewater Treatment by a Cationic Polyacrylamide (CPAM): Preparation, Characterization, and Flocculation Performance

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Badradine Zakaria Djibrine ◽  
Huaili Zheng ◽  
Moxi Wang ◽  
Shuang Liu ◽  
Xiaomin Tang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Wastewater Treatment ◽  
Ph Value ◽  
Incident Light ◽  
Monomer Concentration ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Illumination Time ◽  
Floc Size ◽  
Flocculation Test

P(AM-DMC) (PAD) was synthesized by ultraviolet- (UV-) initiated copolymerization with methacryloxyethyl trimethyl ammonium chloride (DMC) and acrylamide (AM) as the monomers and initiator 2,2-azobis [2-(2-imidazolin-2-yl) propane] dihydrochloride (VA-044) as the photoinitiator. Parameters that affect the molecular weight were reviewed by using the single-factor approach. The results showed that the molecular weight (MW) of PAD could come to 7.88 × 106 Da with the optimum polymerization conditions as follows: monomer concentration of 30%, monomer mass ratio m(AM) : m(DMC) of 3 : 1, initiator concentration of 0.6‰, illumination time of 80 min, solution pH value of 4.5, and incident light intensity of 1000 μW cm−2. The PAD was represented by several instruments. The results of FTIR and 1H NMR showed that PAD was indeed polymerized by AM and DMC. The results of TGA showed that PAD was very stable at room temperature while the result of SEM revealed that PAD had a porous structure and rough surface. For PAD used as flocculant in kaolin wastewater treatment, the results confirmed that, at optimal conditions, the turbidity and the floc size d50 could reach to 5.9 NTU and 565.936 μm, respectively, at the optimal conditions (pH = 7.0 and dosage = 2 mg l−1). Kaolin wastewater flocculation test outcome reveals that the PAD with high cationic degree and intrinsic viscosity could boost the charge neutralization and bridging capability. Consequently, the result is an excellent flocculation performance of treating kaolin wastewater.

scholarly journals Catalytic activity of metals in heterogeneous Fenton-like oxidation of wastewater contaminants: a review

2021 ◽  
Author(s):  
Sajid Hussain ◽  
Eleonora Aneggi ◽  
Daniele Goi
Keyword(s):  
Catalytic Activity ◽  
Emerging Contaminants ◽  
Influencing Factor ◽  
Oxidation Products ◽  
Metal Oxidation ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
Copper Manganese ◽  
Different Types ◽  
Metallic Catalyst

AbstractInnovations in water technology are needed to solve challenges of climate change, resource shortages, emerging contaminants, urbanization, sustainable development and demographic changes. In particular, conventional techniques of wastewater treatment are limited by the presence of poorly biodegradable organic matter. Alternatively, recent Fenton, Fenton-like and hybrid processes appear successful for cleaning of different types of liquid wastewaters. Here, we review the application of metallic catalyst-H2O2 systems in the heterogeneous Fenton process. Each metallic catalyst-H2O2 system has unique redox properties due to metal oxidation state. Solution pH is a major influencing factor. Catalysts made of iron and cerium form stable complexes with oxidation products and H2O2, thus resulting in reduced activities. Copper forms transitory complexes with oxidation products, but copper catalytic activity is restored during the reaction. Silver and manganese do not form complexes. The catalyst performance for degradation and mineralization decreases in the order: manganese, copper, iron, silver, cerium, yet the easiness of practical application decreases in the order: copper, manganese, iron, silver, cerium.

scholarly journals Separation of Radionuclides from a Rare Earth-Containing Solution by Zeolite Adsorption

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 20
Author(s):  
Deniz Talan ◽  
Qingqing Huang
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Contact Time ◽  
Separation Efficiency ◽  
Ph Value ◽  
Solid Phase ◽  
Separation Performance ◽  
Solution Ph ◽  
Zeolite Sample ◽  
Alternative Sources

The increasing industrial demand for rare earths requires new or alternative sources to be found. Within this context, there have been studies validating the technical feasibility of coal and coal byproducts as alternative sources for rare earth elements. Nonetheless, radioactive materials, such as thorium and uranium, are frequently seen in the rare earths’ mineralization, and causes environmental and health concerns. Consequently, there exists an urgent need to remove these radionuclides in order to produce high purity rare earths to diversify the supply chain, as well as maintain an environmentally-favorable extraction process for the surroundings. In this study, an experimental design was generated to examine the effect of zeolite particle size, feed solution pH, zeolite amount, and contact time of solid and aqueous phases on the removal of thorium and uranium from the solution. The best separation performance was achieved using 2.50 g of 12-µm zeolite sample at a pH value of 3 with a contact time of 2 h. Under these conditions, the adsorption recovery of rare earths, thorium, and uranium into the solid phase was found to be 20.43 wt%, 99.20 wt%, and 89.60 wt%, respectively. The Freundlich adsorption isotherm was determined to be the best-fit model, and the adsorption mechanism of rare earths and thorium was identified as multilayer physisorption. Further, the separation efficiency was assessed using the response surface methodology based on the development of a statistically significant model.

scholarly journals The sorption of inorganic arsenic on modified sepiolite: Effect of hydrated iron(III)-oxide

2014 ◽  
Vol 79 (7) ◽  
pp. 815-828 ◽  
Author(s):  
Nikola Ilic ◽  
Slavica Lazarevic ◽  
Vladana Rajakovic-Ognjanovic ◽  
Ljubinka Rajakovic ◽  
Djordje Janackovic ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Arsenic Removal ◽  
Ph Value ◽  
Inorganic Arsenic ◽  
Arsenic Species ◽  
Deionized Water ◽  
Order Kinetic ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 ?C through batch studies. The influence of the initial pH value, the initial As concentrations, the contact time and types of water on the sorption capacity was investigated. Two types of water were used, deionized and groundwater. The maximal sorption capacity for As(III) from deionized water was observed at initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, and the significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g?1 for As(III) and 4.2 mg g?1 for As(V) in deionized water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results show that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has a potential for the application in water purification processes.

Synthesis and Application of Itaconic Acid Water-Coke Slurry Dispersant

2017 ◽  
Vol 896 ◽  
pp. 167-174 ◽  
Author(s):  
Zhi Yuan Yang ◽  
Zhuo Yue Meng ◽  
Zhi Hua Li ◽  
Si Tong Wang
Keyword(s):  
Surface Tension ◽  
Polyethylene Glycol ◽  
Itaconic Acid ◽  
High Performance ◽  
Ph Value ◽  
Raw Materials ◽  
Esterification Reaction ◽  
Solution Ph ◽  
Powder Surface ◽  
Coke Powder

Polyethylene glycol (PEG-200) and itaconic acid (IA) were used as raw materials to compound macromer through esterification reaction. A new type of specialized water-coke slurry dispersant was synthesized by copolymerization of microware, sodium methallyl sulfonate (SMAS) and maleic anhydride (MA). The experiment showed that the concentration of slurry could be reached to 63% with the dosage of 0.2%, and the apparent viscosity was 1140.3 mPa∙s. Through the analysis of the infrared, the dispersant was confirmed to have polyethylene glycol branched chain and hydrophilic functional groups such as carboxyl or sulfonic group. When the concentration of dispersant was 30 g/L, the surface tension of water could be decreased from 72.70 mN/m to 45.50 mN/m. Furthermore, when the solution pH value was 9, the Zeta potential of semi-coke powder surface could also be decreased from-13.38 mV to-25 mV with the addition of dispersant. Thus, this dispersant could increase electronegativity of semi-coke powder surface, enhance steric-hindrance effect and prevent the phenomenon of powder flocculation and gather. Meantime, it also could reinforce the semi-coke hydrophilic by reducing the surface tension of water effectively. And then, the high performance water-coke slurry could be obtained.

Sign in / Sign up

Export Citation Format

Share Document