Study of Cadmium Wastewater Treatment with Polymer PHA Containing Hydroxamic Acid Groups

2012 ◽  
Vol 610-613 ◽  
pp. 1686-1690
Author(s):  
Bi Wang
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Reaction Time ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Removal Rate ◽  
Chelating Agent ◽  
Environmental Safety ◽  
Metal Chelating ◽  
Made In

Polymer heavy metal chelating agent containing hydroxamic acid groups (PHA) was made in order to observe its effects on the removal rate of Cd2+. The present study reaches the following results: (1) On conditions that pH value is 8.0, the chelating agent is 60mg•L-1and the reaction time is 60min, the highest chelating capacity of the polymer heavy metal chelating agent PHA can reach 341 mg/g. (2) The existence of common cations: K+, Na+and Mg2+can improve PHA’s ability to remove Cd2+. (3) The existence of common anions Cl-, SO42-and NO3-can improve PHA’s ability to remove Cd2+. (4) Co-existing with the turbidity-causing materials, PHA’s removal abilities of Cd2+and turbidity are mutually promotive. (5) The chelating product, Cd-PHA’s amount of leaching of Cd2+is only 1/11 of that in neutralization titration ,having a relatively higher stability and better environmental safety.

Synthesis of Graft Copolymer of Starch-Acrylamid-Propylene Hydroxamic Acid and Capability of Trapping Pb2+

2014 ◽  
Vol 1015 ◽  
pp. 369-372
Author(s):  
Chang You Song ◽  
Ai Bing Wu
Keyword(s):  
Heavy Metal ◽  
Reaction Time ◽  
Emulsion Polymerization ◽  
Graft Copolymer ◽  
Metal Ion ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Removal Rate ◽  
Heavy Metal Ion ◽  
Optimum Conditions

In this paper, graft copolymer of starch-acrylamid-propylene hydroxamic acid was synthesized by inverse emulsion polymerization. Effects of the dosage of the graft copolymer, pH value and reaction time on the capability of trapping heavy metal ion Pb2+ were investigated. The results showed that the optimum conditions for treating lead-containing wastewater were: pH=7-9, reaction time≧30min , the dosage of polymeric ferric sulfate and graft copolymer in wastewater were 10mg·L-1 and 250-300mg·L-1, respectively. The Pb2+ removal rate is not less than 99.8% and meanwhile the copolymer possess good removal performance of turbidity.

scholarly journals Study on Chromaticity Removal from Mineral Processing Wastewater with Salicylic Hydroxamic Acid by Granular Activated Carbon Catalyzed Ozonation

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 359
Author(s):  
Liping Zhang ◽  
Shengnian Wu ◽  
Nan Zhang ◽  
Ruihan Yao ◽  
Eryong Wu
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Mineral Processing ◽  
Ultraviolet Absorption Spectrum ◽  
Experimental Conditions ◽  
Removal Ratio

Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC).

scholarly journals Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1732
Author(s):  
Yuanyuan Yu ◽  
Yongjun Sun ◽  
Jun Zhou ◽  
Aowen Chen ◽  
Kinjal J. Shah
Keyword(s):  
Heavy Metal ◽  
Reaction Time ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Monomer Concentration ◽  
Synthesis Process ◽  
Response Surface Optimization ◽  
Metal Capture ◽  
Total Monomer Concentration

In this study, a high-efficiency magnetic heavy metal flocculant MF@AA was prepared based on carboxymethyl chitosan and magnetic Fe3O4. It was characterized by SEM, FTIR, XPS, XRD and VSM, and the Cu(II) removal rate was used as the evaluation basis for the preparation process. The effects of AMPS content, total monomer concentration, photoinitiator concentration and reaction time on the performance of MF@AA flocculation to remove Cu(II) were studied. The characterization results show that MF@AA has been successfully prepared and exhibits good magnetic induction characteristics. The synthesis results show that under the conditions of 10% AMPS content, 35% total monomer concentration, 0.04% photoinitiator concentration, and 1.5 h reaction time, the best yield of MF@AA is 77.69%. The best removal rate is 87.65%. In addition, the response surface optimization of the synthesis process of MF@AA was performed. The optimal synthesis ratio was finally determined as iron content 6.5%, CMFS: 29.5%, AM: 53.9%, AMPS: 10.1%. High-efficiency magnetic heavy metal flocculant MF@AA shows excellent flocculation performance in removing Cu(II). This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove Cu(II) in wastewater.

Antidotes — inappropriate timely availability

2000 ◽  
Vol 19 (9) ◽  
pp. 485-488 ◽  
Author(s):  
M A Higgins ◽  
R Evans
Keyword(s):  
Heavy Metal ◽  
Chelating Agent ◽  
The South ◽  
Chemical Safety ◽  
Metal Chelating ◽  
South West ◽  
Accident And Emergency ◽  
Cyanide Antidote ◽  
International Programme ◽  
Timely Fashion

The aim of this study was to determine the availability of antidotes to poisons in Wales and the South West of England. A stocklist of antidotes that are available to accident and emergency departments was requested and was compared with recommendations from the International Programme on Chemical Safety (IPCS). Chief pharmacists were invited to complete a short questionnaire regarding knowledge of existing guidelines. Thirty-four of 43 centres replied (response rate 77%). No department held all 36 antidotes (mean 13, range 7-33). All departments held antidotes that were frequently used. Ninety-one percent of departments held one cyanide antidote. Eighty-eight percent held one heavy metal chelating agent. The remaining antidotes were variably stocked. New agents such as 4-methylpyrazole, hydroxocobalamin and the heavy metal chelating agents DMSA and DMPS were infrequently held. Twenty of 34 chief pharmacists were unfamiliar with existing UK guidelines. A trend exists whereby larger departments stocked more antidotes. Some antidotes to poisons are not available in a timely fashion in Wales and the South West of England. There is a lack of awareness of existing guidelines. New recommendations relevant to clinical need and local practice should ideally be developed.

Modification of cisplatin toxicity with diethyldithiocarbamate.

1990 ◽  
Vol 8 (9) ◽  
pp. 1585-1590 ◽  
Author(s):  
J M Berry ◽  
C Jacobs ◽  
B Sikic ◽  
J Halsey ◽  
R F Borch
Keyword(s):  
Heavy Metal ◽  
Platelet Count ◽  
Chelating Agent ◽  
Cranial Irradiation ◽  
Limiting Factor ◽  
Preclinical Studies ◽  
Dose Escalation Study ◽  
Metal Chelating ◽  
Wbc Count ◽  
Local Burning

Diethyldithiocarbamate (DDTC), a heavy metal-chelating agent, has been shown to decrease cisplatin (CP) toxicity in preclinical studies. This phase I dose-escalation study was undertaken to investigate DDTC as a chemoprotector in patients with advanced cancer. Thirty-five courses of CP in doses ranging from 120 to 160 mg/m2 were given intravenous (IV) bolus to 19 patients. DDTC at 4 g/m2 was infused over 1 hour, starting 45 minutes after CP. There was minimal nephrotoxicity with a mean creatine clearance of 99 mL/min +/- 4 pretreatment and 86 mL/min +/- 4 on day 21. Two courses were associated with a WBC count less than 2,000/mm3 and one course with a platelet count of 15,000/mm3. Two patients had grade 2 neurotoxicity. Hearing loss occurred in 11 patients: five greater than or equal to 20 dB, five greater than or equal to 40 dB, and one greater than or equal to 60 dB. All patients who received cranial irradiation had ototoxicity compared with 43% of those without radiation (P less than .05). All patients experienced toxicity during the DDTC infusion, including hypertension, flushing, diaphoresis, agitation, and local burning. We conclude that DDTC can protect against CP nephrotoxicity at doses up to 160 mg/m2. Ototoxicity became the dose-limiting factor.

Research on the Start-Up Effect of Two-Phase Anaerobic Baffled Reactor

2013 ◽  
Vol 448-453 ◽  
pp. 600-603
Author(s):  
Ling Jing ◽  
Xin Xia Wang
Keyword(s):  
Wastewater Treatment ◽  
Ph Value ◽  
Removal Rate ◽  
Limiting Factors ◽  
Small Cities ◽  
Two Phase ◽  
Anaerobic Reactor ◽  
Anaerobic Baffled Reactor ◽  
Low Concentration ◽  
Start Up

Aiming at the fact that the low concentration sewage in small cities, this paper presents Two-phase Anaerobic Baffled Reactor (TAABR) for living wastewater treatment, importantly, it designs and researches Two-phase Anaerobic Baffled Reactor and its advantages, designs a trial project according to the characteristics of the reactor equip. The experiment uses the method that by shortening HRT to raise the load to start and analyses the operating results during startup as follows: 1. 53 days later anaerobic reactor start-up successes.2. When the load is 0.5kgCOD/m3.d, the removal rate of COD is more than 80%. 3. PH value is not the main limiting factors during start up in the reactor and there is basically no danger of excessive acidification.

Study on the Photocatalytic Degradation of Diesel Pollutants in Seawater by a Prepared Nano Ag-Droped Zinc Oxide

2014 ◽  
Vol 609-610 ◽  
pp. 311-316
Author(s):  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Jin Fang Chen ◽  
Xiao Jie Jin ◽  
Xu Zheng
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Ph Value ◽  
Uv Light ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Influential Factors ◽  
Influential Factor ◽  
Sonochemical Method

ZnO and Ag-droped ZnO photocatalysts with different Ag loadings (0.5, 1.0, 1.5, 2.0at%) and different calcination temperature (300, 400, 500, 600, 700°C) were synthesized by a sonochemical method. The morphology and crystal pattern of some prepared catalysts were characterized by XRD and SEM techniques which demonstrated that the prepared catalysts were of hexagonal wurtzite structure. Ag loadings, calcination temperature and other factors, dosage of photocatalyst, reaction time and pH value of seawater, were also taken into consideration in the procedure of photocatalytic degradation reaction under UV light. An orthogonal experiment was carried out to investigate the best combination of factors which can reach the best diesel pollution removal rate and the influence order of factors. Reaction time and dosage of catalyst were the most influential factors in this experiment, and the factor of calcination temperature was the weakest influential factor. The removal rate of diesel can up to 78% when the experiment was undertaken under the very conditions: the dosage of catalyst 2.0g/L, reaction time 2.0h, Ag loading of catalyst 1.0 at%, calcinations temperature 400°C and pH value 8.5.

The Treatment of Acid Copper-Containing Wastewater by Eggshell-Flyash System

2011 ◽  
Vol 183-185 ◽  
pp. 967-970
Author(s):  
Tao Liu
Keyword(s):  
Heavy Metal ◽  
Calcination Temperature ◽  
Removal Efficiency ◽  
Treatment Effect ◽  
Ph Value ◽  
Removal Rate ◽  
Good Treatment ◽  
Egg Shells ◽  
Egg Shell ◽  
Application Prospects

Removal efficiency of heavy metal Cu from acid wastewater using egg shell as adsorbent was investigated. The influence of calcination temperature and dosage of egg shell, as well as pH value on the removal efficiency were discussed to obtain the optimum removal condition. The results show that the removal rate of lead would achieve the best result of 99.56% when we use the egg shells calcined at 400°C,2h, and the content of egg shells is 30g/L, pH=3.0.Using eggshells to treat acid chrome-containing wastewater is simple and easy to be operated, which has application prospects for the process and good treatment effect.

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..

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.

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