Study on in-Depth Processing of Coking Wastewater by Coagulation with Aluminum Sulfate

2010 ◽  
Vol 159 ◽  
pp. 493-498 ◽  
Author(s):  
Yi Zheng ◽  
Zhuo Zhang ◽  
Hong Tao Hu ◽  
Xia Liang Wei
Keyword(s):  
Optimal Condition ◽  
Removal Efficiency ◽  
Aluminum Sulfate ◽  
Secondary Standard ◽  
Coking Wastewater ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Optimum Conditions ◽  
Optimum Dosage ◽  
Depth Processing

In this study, in-depth processing of biologically-pretreated coking wastewater was performed using aluminum sulfate (alum) and alum + PAM, respectively, aiming to study removal efficiency of COD, SS and color of coking wastewater as a function of pH, alum dosage and/or PAM, and to determine the optimal conditions for treatment of the coking wastewater. It was found that the optimum dosage and pH are 300 mg/L and 6.5 for coagulation with alum. The optimal condition for coagulation/flocculation with PAM + alum was 15-minute reaction, pH of 6.5, alum dosage of 220 mg/L, PAM dosage of 6 mg/L. Coagulation using alum and PAM at the optimal condition was more efficient than treatment using single alum for removal of COD and color. Effluent COD after coagulation at the optimum conditions met requirements of the secondary standard described in “Integrated wastewater discharge standard”, while the corresponding color exceeded the limit. Hence, coagulation using alum was found to be inefficient in reduction of color for biologically treated coking wastewater.

Study on In-Depth Processing of Low Strength Leachate by Coagulation with Aluminum Sulfate

2010 ◽  
Vol 159 ◽  
pp. 95-99
Author(s):  
Hai Ying Zhang ◽  
Jing Yu Qi
Keyword(s):  
Optimal Condition ◽  
Biological Treatment ◽  
Aluminum Sulfate ◽  
Advanced Treatment ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Optimum Conditions ◽  
Effluent Quality ◽  
Depth Processing ◽  
Low Strength

In this study, in-depth processing of biologically-pretreated low strength leachate was performed using aluminum sulfate (alum) and alum + PAM, respectively, aiming to study removal efficiency of COD, SS and color of leachate as a function of pH, alum dosage and/or PAM, and to determine the optimal conditions for treatment of the leachate. It was found that the optimum dosage and pH are 750 mg/L and 7 for coagulation/flocculation with alum. The optimal condition for coagulation/flocculation with PAM + alum was 25-minute reaction, pH of 6, alum dosage of 500 mg/L, PAM dosage of 5 mg/L. Effluent quality after coagulation at the optimum conditions didn’t met requirements of the tertiary standard described in “Integrated wastewater discharge standard”. Coagulation using alum was found to be inefficient for advanced treatment of refractory leachate after biological treatment.

Advanced Processing of Biologically-Treated Leachate by PAC

2011 ◽  
Vol 474-476 ◽  
pp. 1057-1062
Author(s):  
Hai Ying Zhang ◽  
Dong Hui Chen ◽  
Yi Zheng ◽  
Jing Yu Qi
Keyword(s):  
Optimal Condition ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Advanced Treatment ◽  
Optimal Dosage ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Biochemical Treatment ◽  
Effluent Quality

In this study, biologically treated leachate was treated using PAC and PAC + PAM, respectively, to study removal efficiency of COD, SS and color as a function of such influencing factors as pH, dosage of PACand/or PAM. It was found that optimal dosage and pH are 800 mg/L and 6 for PAC. The optimal condition when using PAM + PACfor removal of COD was 10-minute reaction, pH of 5, PAC dosage of 800 mg/L, PAM dosage of 3 mg/L. Effluent quality after coagulation at the optimal conditions met requirements of the tertiary standard described in “Integrated wastewater discharge standard”. Coagulation using PAM + PAC at the optimal condition was recommended for advanced treatment of refractory leachate after biochemical treatment.

Advanced Processing of Biologically-Treated Papermaking Wastewater by Poly-Aluminum Chloride (PAC)

2013 ◽  
Vol 409-410 ◽  
pp. 129-132
Author(s):  
Yong Qiang Zhu ◽  
Yu Ling Feng ◽  
Hai Ying Zhang ◽  
Zhan Jun Zhang
Keyword(s):  
Removal Efficiency ◽  
Aluminum Chloride ◽  
Industrial Wastewater ◽  
Optimal Dosage ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Paper Making ◽  
Stirring Time ◽  
Papermaking Wastewater

In this study, biologically treated paper-making wastewater was treated using PAC to study removal efficiency of color as a function of pH and dosage of PAC. It was found that PAC was relatively effective in removing color from biologically papermaking wastewater. The optimal dosage, pH and stirring time were 40 mL L-1, 5 and 30 min, respectively. Effluent color after coagulation at the optimal conditions was 40 PCU, meeting requirements of Industrial Wastewater Discharge Standard of Pulping and Papermaking (GB3544-2008) . Therefore, PAC dosage of 40 mL L-1 and pH of 5 were recommended for treatment of biologically treated papermaking wastewater.

High Turbidity Mine Water Treated by Magnetic Flocculation

2011 ◽  
Vol 356-360 ◽  
pp. 1867-1870
Author(s):  
Jian Dong Guo ◽  
Xiang Dong Li ◽  
Guo Jun Wu ◽  
Zhi Chao Wang ◽  
Jun Ke Song ◽  
...  
Keyword(s):  
Water Treatment ◽  
Optimal Condition ◽  
Removal Efficiency ◽  
Mine Water ◽  
Magnetic Particle ◽  
Optimal Conditions ◽  
Mine Water Treatment ◽  
High Turbidity

In the paper, magnetic flocculation was used in high turbidity mine water treatment. The results show that the magnetic flocculation is one of efficient methods in removing the COD and SS of high turbidity mine water. It finds the optimal conditions: the PAFC was 30mg/L and added with the fast stirring speed being 250r/min for 2min; then, 50mg/L magnetic particle was added with slow stirring speed staying 50r/min for 7min. The wastewater is treated under the optimal condition, the removal efficiency of SS and COD reached 94% and 71% respectively.

Advanced Treatment of Stabilized Leachate by Sodium Hypochlorite Composite Chemicals

2011 ◽  
Vol 474-476 ◽  
pp. 1272-1276 ◽  
Author(s):  
Hai Ying Zhang ◽  
Hong Tao Hu ◽  
Yi Zheng ◽  
Dong Hui Chen
Keyword(s):  
Reaction Time ◽  
Optimal Condition ◽  
Sodium Hypochlorite ◽  
Biological Treatment ◽  
Advanced Treatment ◽  
Sodium Hypochlorite Solution ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Hypochlorite Solution ◽  
Effluent Quality

In this work, advanced treatment of leachate after biological treatment was performed using sodium hypochlorite solution (NaClO) + ferric chloride (FeCl3) + polyacrylamide (PAM) and NaClO + aluminum poly-chloride (PAC) + PAM, respectively, to determine the optimal condition for removal of COD and color. It was found that the optimal condition was: PAM 5 mg/L, FeCl3 420 mg/L, NaClO 6 mL/L, reaction time 15 min for treatment using FeCl3 + NaClO + PAM, and PAM 5 mg/L, PAC 800 mg/L, NaClO 6 mL/L, reaction time 15 min for PAC + NaClO + PAM. After being treated at the optimal conditions, the effluent quality met requirements of the tertiary grade described in “Integrated wastewater discharge standard”.

The Elimination of Heavy Metal-Containing Wastewater by Eggshells Membrane

2013 ◽  
Vol 299 ◽  
pp. 207-210 ◽  
Author(s):  
Ning Liu ◽  
Ya Nan Liu ◽  
You Shun Luan ◽  
Xiao Jie Hu
Keyword(s):  
Heavy Metal ◽  
Removal Efficiency ◽  
Eggshell Membrane ◽  
Optimum Conditions ◽  
Adsorption Time ◽  
Optimum Dosage ◽  
Adsorption Temperature ◽  
Simulated Wastewater

In this study the eggshell membrane adsorption for chromium, cadmium, copper in the wastewater was investigated through the discussion of the amount of eggshell membrane, adsorption time, adsorption temperature, as well as the removal efficiency under the optimum conditions. The results show that for the Cr6+、Cd2+、Cu2+ in the simulated wastewater solution, the optimum dosage of eggshell membrane were 1.2g、1.0g and 1.2g, the best adsorption time were 45min、30min and 60min, the optimum adsorption temperature were 50°C、70°Cand 70°C, respectively.

scholarly journals ADSORPTIVE REMOVAL OF RHODAMINE B USING SURFACTANT MODIFIED LATERITE SOIL

2018 ◽  
Vol 56 (6) ◽  
pp. 706
Author(s):  
Tien Duc Pham ◽  
Thu Thao Pham
Keyword(s):  
Ionic Strength ◽  
Removal Efficiency ◽  
Rhodamine B ◽  
Sodium Dodecyl ◽  
Optimal Conditions ◽  
Optimum Conditions ◽  
Adsorption Model ◽  
Laterite Soil ◽  
Adsorptive Removal ◽  
Nacl Concentration

Adsorption of the cationic dye, Rhodamine B (RhB) onto surfactant modified laterite (SML) was studied in this work. The removal efficiency of RhB using laterite increased significantly after surface modification by pre-adsorption of anionic surfactant sodium dodecyl sulfate (SDS). Some effective of parameters such as pH, adsorbent amount and ionic strength were also investigated. The optimal conditions for RhB removal using SML were found to be pH 4, adsorbent amount 0.1 g and ionic strength 0.1 mM NaCl. Under optimum conditions, RhB removal efficiency increased from 25.77% to 94.85% using SML compared without SDS modification. After 5 regenerations of SML, the removal efficiency of RhB was still higher than 90%.  Adsorption of RhB onto SML decreased with increasing NaCl concentration from 0.1 to 200 mM, demonstrating that adsorption of RhB onto SML mainly induced by electrostatic attraction. The two-step adsorption model can fit the experimental results of RhB adsorption isotherms onto SML at different NaCl concentrations. Our results indicate that SML is a novel adsorbent to remove ionic dye from aqueous solution.

The technical and economic comparison of ethylene production from natural gas and ethane

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Farooq Abubakar Atiku ◽  
Vahid Pirouzfar ◽  
Chia-Hung Su ◽  
Sung-Yen Wei
Keyword(s):  
Natural Gas ◽  
Ethylene Production ◽  
Petrochemical Industry ◽  
Rate Of Return ◽  
Optimal Conditions ◽  
Economic Optimization ◽  
Optimum Conditions ◽  
Investment Cost ◽  
Significant Step ◽  
Economic Comparison

Abstract Ethylene is one of the most primary and widely used petrochemical products in today’s world and is considered as a chemical building block in the petrochemical industry. In this research, ethylene production from ethane and natural gas is evaluated in terms of cost and optimum conditions. Also, a comprehensive economic and technical comparison is made to achieve the optimal conditions for ethylene production concerning feed diversity. Nowadays most ethylene production units run with ethane feed. If it is possible to implement gas-ethylene processes with an inexpensive natural gas feed, it will be a significant step for technical and economic optimization. Thus, some methods are introduced and compared, and finally an economic review about best condition for ethylene production from ethane and natural gas/investment with regard to cost and economic efficiency of the methods is provided. The investment cost for Gas to Ethylene (GTE) and Ethane to Ethylene (ETE) processes is 363–701 million dollars per year, respectively. Also, rate of return (ROR) of 24 and 19% is calculated for GTE and ETE processes, respectively.

scholarly journals Treatment of oilfield wastewater by combined process of micro-electrolysis, Fenton oxidation and coagulation

2017 ◽  
Vol 76 (12) ◽  
pp. 3278-3288 ◽  
Author(s):  
Zhenchao Zhang
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Treatment Process ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Oily Wastewater ◽  
Optimum Conditions ◽  
Combined Process ◽  
Cod Removal Efficiency ◽  
Optimized Conditions

Abstract In this study, a combined process was developed that included micro-electrolysis, Fenton oxidation and coagulation to treat oilfield fracturing wastewater. Micro-electrolysis and Fenton oxidation were applied to reduce chemical oxygen demand (COD) organic load and to enhance organic components gradability, respectively. Orthogonal experiment were employed to investigate the influence factors of micro-electrolysis and Fenton oxidation on COD removal efficiency. For micro-electrolysis, the optimum conditions were: pH, 3; iron-carbon dosage, 50 mg/L; mass ratio of iron-carbon, 2:3; reaction time, 60 min. For Fenton oxidation, a total reaction time of 90 min, a H2O2 dosage of 12 mg/L, with a H2O2/Fe2+ mole ratio of 30, pH of 3 were selected to achieve optimum oxidation. The optimum conditions in coagulation process: pH, cationic polyacrylamide dosage, mixing speed and time is 4.3, 2 mg/L, 150 rpm and 30 s, respectively. In the continuous treatment process under optimized conditions, the COD of oily wastewater fell 56.95%, 46.23%, 30.67%, respectively, from last stage and the total COD removal efficiency reached 83.94% (from 4,314 to 693 mg/L). In the overall treatment process under optimized conditions, the COD of oily wastewater was reduced from 4,314 to 637 mg/L, and the COD removal efficiency reached 85.23%. The contribution of each stage is 68.45% (micro-electrolysis), 24.07% (Fenton oxidation), 7.48% (coagulation), respectively. Micro-electrolysis is the uppermost influencing process on COD removal. Compared with the COD removal efficiency of three processes on raw wastewater under optimized conditions: the COD removal efficiency of single micro-electrolysis, single Fenton oxidation, single coagulation is 58.34%, 44.88% and 39.72%, respectively. Experiments proved the effect of combined process is marvelous and the overall water quality of the final effluent could meet the class III national wastewater discharge standard of petrochemical industry of China (GB8978-1996).

Removal of phenol from steel wastewater by combined electrocoagulation with photo-Fenton

2018 ◽  
Vol 78 (6) ◽  
pp. 1260-1267 ◽  
Author(s):  
Mohammad Malakootian ◽  
Mohammad Reza Heidari
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Current Density ◽  
Steel Industry ◽  
High Efficiency ◽  
Oxygen Demand ◽  
Optimal Conditions ◽  
Suitable Alternative ◽  
Steel Mills ◽  
Real Wastewater

Abstract Phenol and its derivatives are available in various industries such as refineries, coking plants, steel mills, drugs, pesticides, paints, plastics, explosives and herbicides industries. This substance is carcinogenic and highly toxic to humans. The purpose of the study was to investigate the removal of phenol from wastewater of the steel industry using the electrocoagulation–photo-Fenton (EC-PF) process. Phenol and chemical oxygen demand (COD) removal efficiency were investigated using the parameters pH, Fe2+/H2O2, reaction time and current density. The highest removal efficiency rates of phenol and COD were 100 and 98%, respectively, for real wastewater under optimal conditions of pH = 4, current density = 1.5 mA/cm2, Fe2+/H2O2 = 1.5 and reaction time of 25 min. Combination of the two effective methods for the removal of phenol and COD, photocatalytic electrocoagulation photo-Fenton process is a suitable alternative for the removal of organic pollutants in industry wastewater because of the low consumption of chemicals, absence of sludge and other side products, and its high efficiency.

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