Scale Inhibition and Removal in Continuous Pulp Digesters

2012 ◽  
Vol 51 (30) ◽  
pp. 10283-10286 ◽  
Author(s):  
Sujit Banerjee ◽  
Tuan Le ◽  
Peter W. Hart
Keyword(s):  
Scale Inhibition ◽  
Pulp Digesters

ZIF-8@s-EPS as a novel hydrophilic multifunctional biomaterial for efficient scale inhibition, antibacterial and antifouling in water treatment

2021 ◽  
Vol 773 ◽  
pp. 145706
Author(s):  
Rui-Xia Gao ◽  
Yan Li ◽  
Ting-Ting Zhu ◽  
Yi-Xiu Dai ◽  
Xiao-Hong Li ◽  
...  
Keyword(s):  
Water Treatment ◽  
Scale Inhibition

scholarly journals Effect of permanent magnetic field on scale inhibition property of circulating water

2017 ◽  
Vol 76 (8) ◽  
pp. 1981-1991 ◽  
Author(s):  
Lili Jiang ◽  
Xiayan Yao ◽  
Haitao Yu ◽  
Xingang Hou ◽  
Zongshu Zou ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hydrogen Bonds ◽  
Flow Velocity ◽  
Magnetic Field Intensity ◽  
Water Molecules ◽  
Relative Variation ◽  
Initial Concentration ◽  
Circulating Water ◽  
Scale Inhibition ◽  
Inhibition Property

Effect of a permanent magnet field on the scale inhibition property of circulating water was investigated. Orthogonal experiments of L16(45) were performed and analyzed using the range analysis method. The operating parameters included magnetic field intensity, initial concentration of Ca2+ and Mg2+, magnetic treatment time, temperature, and flow velocity. Scale inhibition rate, hardness, relative variation in the proportion of free water molecules, electrical conductivity, and relative variation of molecular energy were chosen as the objectives. In addition, the morphology and the composition of CaCO3 and MgCO3 scale were studied by X-ray diffraction analysis. The optimal conditions were initial concentration of 900 mg/L, magnetic field intensity of 0.5 T, temperature of 303 K, time of 54 h and flow velocity of 0.17 m/s. The nuclear magnetic resonance results demonstrated that the number of hydrogen bonds increased between water molecules and hydrated ions. The magnetic field can promote the increase in the number of hydrogen bonds, which can inhibit the formation of calcium and magnesium carbonate precipitation. Moreover, the ratio of calcite, aragonite and vaterite will be changed at different magnetic field intensities, and the aragonite ratio will reach the peak at the optimum conditions.

Research Progress of Scale Inhibition Mechanism

2014 ◽  
Vol 955-959 ◽  
pp. 2411-2414 ◽  
Author(s):  
Li Xiu Liu ◽  
Ai Jiang He
Keyword(s):  
Metal Surface ◽  
Inorganic Salt ◽  
Simulation Technique ◽  
Research Progress ◽  
Inhibition Mechanism ◽  
Scale Inhibitor ◽  
Scale Inhibition

Scale inhibitor is a medicament which has the properties of dispersing insoluble inorganic salt in water, and preventing or obstructing sediment and scaling of insoluble inorganic salt on metal surface. Research on the mechanism of scale inhibition can promote using and developing scale inhibitors. In this paper, the traditional macroscopic mechanism of scale inhibition was firstly analyzed, and it was also emphasized to introduce the research progress of quantization simulation technique on the mechanism of scale inhibition, and it was also suggested to combine the microstructure of scale crystal with quantization simulation technique to have a further study on the mechanism of scale inhibition.

A novel polyaspartic acid derivative with multifunctional groups for scale inhibition application

2017 ◽  
Vol 39 (7) ◽  
pp. 843-850 ◽  
Author(s):  
Ying Zhang ◽  
Hongquan Yin ◽  
Qingshan Zhang ◽  
Yunzheng Li ◽  
Pengjun Yao ◽  
...  
Keyword(s):  
Acid Derivative ◽  
Polyaspartic Acid ◽  
Scale Inhibition

Synthesis, Characterization and Properties of the IA / SAS Copolymer

2013 ◽  
Vol 423-426 ◽  
pp. 404-407
Author(s):  
Zhen Fa Liu ◽  
Hao Lin Fu ◽  
Li Hui Zhang ◽  
Yan He Zhang ◽  
Xuan Liu
Keyword(s):  
Calcium Carbonate ◽  
Calcium Phosphate ◽  
Itaconic Acid ◽  
Inhibition Rate ◽  
Biodegradation Rate ◽  
Scale Inhibition ◽  
Good Scale

A copolymer was prepared from itaconic acid (IA) and sodium allysulfonate (SAS). The structure of the IA/SAS copolymer was characterized by the means of FTIR. The performances of scale inhibition, dispersion and biodegradability of the IA/SAS copolymer were studied. The results showed that the IA/SAS copolymer had good scale inhibition and dispersing performance. The scale inhibition rate on calcium carbonate was 93% when the copolymer was 20 mg·L-1. The scale inhibition rate on calcium phosphate was 92% when the copolymer was 24 mg·L-1. The copolymer had good biodegradation performance and biodegradation rate could reach 69.5% after 28 days.

Combined effect of constant high voltage electrostatic field and variable frequency pulsed electromagnetic field on the morphology of calcium carbonate scale in circulating cooling water systems

2014 ◽  
Vol 70 (6) ◽  
pp. 1074-1082 ◽  
Author(s):  
Ju-Dong Zhao ◽  
Zhi-An Liu ◽  
Er-Jun Zhao
Keyword(s):  
Calcium Carbonate ◽  
Electromagnetic Fields ◽  
High Voltage ◽  
Combined Effect ◽  
Variable Frequency ◽  
Pulsed Electromagnetic Fields ◽  
Calcium Carbonate Precipitation ◽  
Water Flow Velocity ◽  
Scale Inhibition ◽  
Pulsed Electromagnetic

Research on scale inhibition is of importance to improve the heat transfer efficiency of heat exchangers. The combined effect of high voltage electrostatic and variable frequency pulsed electromagnetic fields on calcium carbonate precipitation was investigated, both theoretically and experimentally. Using energy dispersive spectrum analysis, the predominant phase was found to be CaCO3. The formed crystal phases mainly consist of calcite and aragonite, which is, in part, verified by theory. The results indicate that the setting of water flow velocity, and high voltage electrostatic and variable frequency pulsed electromagnetic fields is very important. Favorable values of these parameters can have a significant anti-scaling effect, with 68.95% of anti-scaling ratio for scale sample 13, while unfavorable values do not affect scale inhibition, but rather promoted fouling, such as scale sample 6. By using scanning electron microscopy analysis, when the anti-scaling ratio is positive, the particle size of scale was found to become smaller than that of untreated sample and the morphology became loose. The X-ray diffraction results verify that the good combined effect favors the appearance and growth of aragonite and restrains its transition to calcite. The mechanism for scale reduction is discussed.

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