A Research on Bactericidal Agent of Heterotrophic Bacteria in Cooling Water by Composite of Non-Oxidizing Biocide and Oxidizing Biocide

2014 ◽  
Vol 955-959 ◽  
pp. 1036-1040
Author(s):  
Cai Xia Sun ◽  
Yan Min Chen ◽  
Yu Shan Cheng ◽  
Min Zhang ◽  
Jin Ying Wu ◽  
...  
Keyword(s):  
Heterotrophic Bacteria ◽  
Cooling Water ◽  
Inhibition Rate ◽  
Scale Inhibition ◽  
Method Show ◽  
Bactericidal Agent ◽  
Fonic Acid

A method was developed to control heterotrophic bacteria in cooling water by mixing non-oxidizing (Isothiazolinones）and oxidizing sterilization （Hydantoin）together. The result of disinfection test shows that the agent possesses a higher efficiency. At the same time the method introduced polyepoxysuccinic acid—1-Acrylanmido-2-methylpropanesul fonic acid（PESA-AMPS (10%)) in to the disinfection system. The rotary coupon test and aeration scale inhibition method show that the bactericidal agent also possesses higher anti-corrosion and inhibition rate. The concentration of heterotrophic bacteria can well be controlled below 105cfu/mL when the additional quantity of the agent changes from 100mg/L to 200mg/L.

Green Composite Scale Inhibitor in Central Air Conditioning Cooling Water

2015 ◽  
Vol 730 ◽  
pp. 183-186
Author(s):  
Mao Dong Li ◽  
Xian Di Zuo ◽  
Bo Yang ◽  
Jun Ming Zhao ◽  
Ying Tong Chen ◽  
...  
Keyword(s):  
Glutamic Acid ◽  
Air Conditioning ◽  
Cooling Water ◽  
Metal Corrosion ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Green Composite ◽  
Circulating Water ◽  
Scale Inhibition ◽  
Central Air Conditioning

With the improvement of living standards, air conditioning becomes the requisite of people’s life; the central air conditioning has become each big building of major appliances[1]. In the whole air conditioning cooling water treatment system, such as scale and sludge which is formed by the metal corrosion phenomenon, will seriously affect the use efficiency of air conditioning. One of the effective solution is adding scale inhibitor to the circulating water. Calcium carbonate deposition method is used to evaluate the scale inhibition rate of PASP, PESA and poly glutamic acid. then evaluate the scale inhibition rate of two compound formula. Results show that PESA with the best scale inhibitor performance, on the basis of its, respectively, compound with PASP and poly glutamic acid. The compound repice can improve the efficiency of scale inhibition. The optimized prescription is that, the PASP is 4mg/L, the PESA is 6mg/L, at this time of scale inhibition efficiency can reach 93.43%.

Study on Scale Inhibition Performance of Modified Polyaspartic Acid

2014 ◽  
Vol 893 ◽  
pp. 7-10 ◽  
Author(s):  
Yu Hua Gao ◽  
Zhen Fa Liu ◽  
Li Hui Zhang ◽  
Yun Juan Wu
Keyword(s):  
Cooling Water ◽  
Water Systems ◽  
Solution Temperature ◽  
Inhibition Rate ◽  
Polyaspartic Acid ◽  
Scale Inhibition ◽  
Dynamic Experiments ◽  
Treatment Experiment ◽  
Good Scale ◽  
Inhibition Performance

Static and dynamic experiments were used to evaluate scale inhibition performance of modified polyaspartic acid (PASP-ASP). The static experiments showed that the PASP-ASP had good scale inhibition performance and the scale inhibition rate exceeded 98% when the PASP-ASP was 2 mg·L-1 and the solution temperature was 40 OC. In the dynamic experiments, almost no scale was formed on the heat transfer surface and the fouling thermal resistance decreases extraordinarily with PASP-ASP treatment experiment compared with the experiment without treatment. The PASP-ASP could be used in industrial cooling water systems.

Research on Scale Inhibition of Green Scale Inhibitors Used in the Industrial Recycling Cooling System with Reclaimed Wastewater

2013 ◽  
Vol 864-867 ◽  
pp. 1767-1771
Author(s):  
Guan Hua Yue ◽  
Man Zhang ◽  
Ying Han Yu
Keyword(s):  
Cooling System ◽  
Cooling Water ◽  
Domestic Sewage ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Reclaimed Wastewater ◽  
High Scale ◽  
Scale Inhibition ◽  
Thermoelectric Plant ◽  
Green Scale Inhibitors

The reclaimed water of domestic sewage reused in recycling cooling system has been widely spread and applied. Chemical scale inhibitors are the most economic and effective measures to prevent condensers and circulating pipes from scaling currently. Green scale inhibitor are highly regarded for their non-toxicity, phosphate-free, reproducibility and biodegradability. The paper selects two kinds of new green scale inhibitors used in the recycling cooling water of Beijing Thermoelectric Plant. By the measuring the scale inhibition rate, scaling amount, turbidity and SEM, it shows that Polyepoxysuccinic acid (PESA) is worth spreading and applying in the industrial recycling cooling system with reclaimed wastewater, for its high scale inhibition rate, good dispersion, low consumption, high economy and practicability.

Application and Research on Corrosion and Scale Inhibitor WJF-6 in Seawater Circulation Cooling Water

2011 ◽  
Vol 189-193 ◽  
pp. 3288-3291 ◽  
Author(s):  
Yong Zhang Zhou ◽  
Chun Yan Yang ◽  
Xin Ni ◽  
Dong Sheng Chen
Keyword(s):  
Linear Polarization ◽  
Cooling Water ◽  
Electrode Reaction ◽  
National Standard ◽  
Anodic Process ◽  
Corrosion Mechanism ◽  
Inhibition Rate ◽  
Scale Inhibitor ◽  
Scale Inhibition ◽  
Simulated Seawater

The inhibition effect of corrosion and scale inhibitor WJF-6 on Q235 steel in simulated seawater circulation cooling water was studied by rotary coupon corrosion tests. And corrosion mechanism of this inhibitor was researched by some electrochemical measurements such as polarized curves and linear polarization, scale inhibition performance of this inhibitor was studied by static anti-scale method. At the same time, the corrosion and scaling influence of concentrated 1,2,3times for corrosion and scale inhibitor WJF-6, used in simulated seawater circulation cooling water, was researched. The results showed that the corrosion inhibitor efficiency reached 91.8% with 75mg/L of the inhibitor with linear velocity of 0.3m/s, and rotation of 72h at 50°C when concentrated multiple was three times. The results of linear polarization showed polarized resistance greatly increase by adding 75mg/L of this kind of inhibitor, its inhibition rate achieved 81.3%. The results of polarized curve revealed the strong polarized area of polarized curve have left shift and anodic polarized curves of electrode reaction was increased in strong polarized area, the basic function of corrosion and scale inhibitor WJF-6 is that the anodic process of electrode reaction were restrained. The effect of concentration multiple on corrosion and scale inhibitor WJF-6 in simulated seawater circulation cooling water showed that the corrosion rate was less than 0.125mm/a of the national standard and when concentrated multiple of simulated seawater circulation cooling water exceeded three times, and scale inhibition rate was more than 90%.

scholarly journals Effect of Magnesium Ion Concentration on the Scale Inhibition of Heat Exchanger in Circulating Cooling Water under Alternating Electric Field

2020 ◽  
Vol 10 (16) ◽  
pp. 5491
Author(s):  
Zhihao Zhang ◽  
Yun Jia ◽  
Judong Zhao
Keyword(s):  
Calcium Ion ◽  
Cooling Water ◽  
Ion Concentration ◽  
Magnesium Ion ◽  
Inhibition Rate ◽  
Fouling Resistance ◽  
Scale Inhibition ◽  
Alternating Electric Field ◽  
Circulating Cooling Water ◽  
Calcium Ion Concentration

This work investigated the effect of magnesium ion concentration on the formation of mineral scale in circulating cooling water under alternating electric field treatment (AEFT) by using a self-made power plant circulating cooling water simulator. In this experiment, the circulating cooling water used was artificial hard water. Three experimental groups with different magnesium ion concentrations and three corresponding control groups were studied. Scale inhibition rate, fouling resistance, calcium ion concentration, crystal phase, and crystal morphology were discussed. Results showed that 4 mmol/L magnesium chloride promoted the formation of scale on the copper tube wall, and the average scale inhibition rate was −107.86%. When the magnesium chloride concentration was 6 mmol/L, the situation was reversed, and the average scale inhibition rate reached 59.11%. The changes in calcium ion concentration supported the scale inhibition rate. Scanning electron microscope (SEM) photos showed the change in the composition of calcium carbonate crystals. The results showed that the effect of AEFT on fouling resistance is nonlinearly related to the concentration of magnesium ions in circulating cooling water.

Electromagnetic Field Acting on the Scale Inhibition Experiment and Mechanism on Circulating Cooling Water of Power Plant

2014 ◽  
Vol 664 ◽  
pp. 62-69
Author(s):  
Zhi An Liu ◽  
Shan Long ◽  
Ju Dong Zhao ◽  
Tian Xia ◽  
Hui Feng An ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Power Plant ◽  
Cooling Water ◽  
Field Size ◽  
Inhibition Rate ◽  
Crystalline Phases ◽  
Inhibition Effect ◽  
Scale Inhibition ◽  
Circulating Cooling Water ◽  
Inhibition Experiment

The scale-inhibition effect of electromagnetic field was tested on circulating cooling water of power plant, and then the scale sample was analyzed by SEM and XRD. The results showed that, under optimum scale-inhibition conditions, aragonite content increased and calcite content decreased, and scale-inhibition rate was up to 78.2%; under the poorest conditions, both aragonite and calcite crystals existed, and the scale-inhibition rate was-201.0%; after treating with electromagnetic field, size of both calcite and aragonite particles decreased, making them more easily flown away and thus showing better overall scale-inhibition effect; when energy provided by the electromagnetic field was more than the decrease in free energy of the system, extra energy turns the calcite CaCO3 into other forms of metastable crystalline phases, then content of different crystalline phases is changed in favor of scale inhibition.

Synthesis and Properties of Environmentally Friendly Scale and Corrosion Inhibitor

2014 ◽  
Vol 618 ◽  
pp. 180-183
Author(s):  
Zhen Fa Liu ◽  
Xue Bai ◽  
Li Hui Zhang ◽  
Yan Liang Zhang
Keyword(s):  
Weight Loss ◽  
High Temperature ◽  
Water System ◽  
Cooling Water ◽  
Inhibition Rate ◽  
Polyaspartic Acid ◽  
Ternary Composite ◽  
Scale Inhibition ◽  
Circulating Cooling Water ◽  
Good Scale

Polyaspartic acid (PASP) and a copolymer (AA) of acrylic acid and acrylicester were synthesized. A ternary composite (PASP-AA-DTPMP) was made from PASP, AA and DTPMP. The performances of ternary composite were studied by using static scale inhibition and weight loss of rotating hung steel slices test. When the concentration of ternary composite was 6mg/L, the scale inhibition rate reached 95% and the corrosion inhibition rate reached 97.9%. The results showed that the ternary composite had good scale and corrosion inhibiton performance and was suitable for high temperature and hardness circulating cooling water system.

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.

Study on Scale Inhibition Performance of Polyaspartic Acid Derivatives with Dihydroxyl Group on CaCO3

2011 ◽  
Vol 361-363 ◽  
pp. 1982-1986 ◽  
Author(s):  
Li Jun Fu ◽  
Yu Zeng Zhao ◽  
Hong Hua Ge ◽  
Yong Sheng Li
Keyword(s):  
Aqueous Solution ◽  
Cooling Water ◽  
Ftir Spectrum ◽  
Polyaspartic Acid ◽  
Environment Friendly ◽  
Scale Inhibition ◽  
Inhibition Performance

An environment-friendly and multifunctional agent for industry circulation cooling water, polyaspartic acid derivatives with dihydroxyl group(DHPAP) was synthesized in aqueous solution. The FTIR spectrum of DHPAP was analyzed. Static experiments were carried out to validate scale inhibition performance of DHPAP. The scale inhibition ratios exceed 90% when 8 and 10 mg/L DHPAP under solution temperatures of 80 and 60°C, respectively. The scale inhibition ratios increase by increasing the DHPAP concentration with 6 and 8 mg/L under heating times of 10 and 6h, respectively. And the scale inhibition ratios are over 90%.

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