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 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”.

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.

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.

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.

Study on Treatment of Wastewater from Papermaking Using Fenton Oxidation

2013 ◽  
Vol 726-731 ◽  
pp. 1760-1763 ◽  
Author(s):  
Gang Li ◽  
Jun Yu ◽  
Yan Hao Zhang ◽  
Lei Gao ◽  
Bo He
Keyword(s):  
Reaction Time ◽  
Influencing Factors ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Biochemical Treatment ◽  
Oxidation Treatment ◽  
Paper Making ◽  
Papermaking Wastewater

The performance of biochemical treatment effluent from paper making wastewater treated by Fenton process was evaluated. The experiment result shows that the importance of influencing factors for Fenton oxidation treatment was H2O2 concentrations > pH > FeSO4 concentrations > reaction time. With the optimal conditions of reaction, that is pH3 (initial pH5), FeSO4 3.6 mmol/L, H2O2 3.4 mmol/L, and reaction time 60 min, the removals of COD and color for papermaking wastewater reached over 85% and 90%, respectively. The result also showed that in the process of Fenton method in the treatment of papermaking wastewater, for removing COD, the function by oxidation account for 15.5%, and the function of flocculation accounted for 69.8%.

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.

Continuing the Development of Municipal Effluent Guidelines for the Northwest Territories

1986 ◽  
Vol 18 (2) ◽  
pp. 179-184
Author(s):  
R. J. Kent
Keyword(s):  
Northwest Territories ◽  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Coliform Bacteria ◽  
Flow Ratio ◽  
Dilution Ratio ◽  
Effluent Quality ◽  
Municipal Effluent

The background to and the rationale for the Guidelines for Municipal Type Wastewater Discharges in the Northwest Territories is discussed. Particu1ar attention is given to the development of Table 2.1, Effluent Quality of Municipal Wastewater Discharges, which was based upon expected lagoon performance. Also included is a discussion of the flow ratio and dilution ratio concepts. The viability of these concepts was assessed against the available data. It appears that the guidelines misjudged both the number of coliform bacteria in northern raw sewage and the removal efficiency for these organisms in lagoons. It appears unlikely that lagoons can consistently meet the guideline requirements. More information and research is necessary before a complete assessment can be performed.

Experimental Study on the Optimal Thickness of Infiltration Media of the CRI System

2011 ◽  
Vol 415-417 ◽  
pp. 1703-1707
Author(s):  
Jun Min Chen ◽  
Xiao Lin Yao
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Significant Influence ◽  
Soil Column ◽  
Experimental Results ◽  
Artificial Soil ◽  
Optimal Thickness ◽  
Effluent Quality ◽  
Anaerobic Zone

Abstract. In order to investigate the optimal thickness of infiltration media in the Constructed Rapid Infiltration System, the artificial soil column is used to simulate the Constructed Rapid Infiltration System, and the CODCr, NH3-N and TN concentrations of the effluent from all the sampling sites are monitored. The experimental results and analysis show that the thickness of infiltration media exerts a significant influence on the CODCr, NH3-N and TN concentration and removal efficiency of the effluent; the CODCr, NH3-N and TN are mainly removed in the 0-1800mm zone of the artificial soil column; the total CODCr removal efficiency increases, as the thickness of infiltration media increases, but the CODCr removal efficiency in the 1800-2200mm zone is very low; the NH3-N and TN removal efficiency reaches the maximum where the thickness of infiltration media is 1800mm; the NH3-N and TN concentration of the effluent from 1800-2200mm zone dose not decrease, but increase 5-8%, due to the assimilation denitrification and amemoniation reaction on the end of the anaerobic zone; in consideration of the effluent quality, efficient biodegradation zone, construction investment, etc. the optimal thickness of infiltration media in CRI system should be 1800mm.

Preparation of Sands Modified by Aluminous Salt and its Adsorption Capability of CD2+

2011 ◽  
Vol 130-134 ◽  
pp. 856-859
Author(s):  
Chun Sheng Ding ◽  
Yang Ping Fu ◽  
Qian Fen Zhu ◽  
Jing Fu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Specific Surface Area ◽  
Quartz Sand ◽  
Ph Value ◽  
Alkaline Condition ◽  
Initial Concentration ◽  
Adsorption Capability

In this experiment quartz sand was chosen as a carrier to be coated by aluminous salt under alkaline condition, and then the specific surface area was tested, and the adsorption capability and Cd2+ removal influencing factors of modified sand were studied. The investigation results showed that the specific surface area of modified sand was 75.244m2/g which was 9.38 times of that of original sand; the removal efficiency of Cd2+ by aluminous salt modified sand reached 59% contrast to 39% of original sand with pH 7.00. It was also found that the removal efficiency of Cd2+ by the aluminous salt modified sand was reduced with the increase of initial concentration of Cd2+ solution, and was enhanced with the increase of pH value, the Cd2+ removal efficiency was almost 71% with pH 9.0.

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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