Biocide Screening of Secondary Effluent of Sewage Treatment Plant directly Reused in Power Plant Circulating Cooling Water System and the Study on its Properties

2012 ◽  
Vol 229-231 ◽  
pp. 2510-2513
Author(s):  
Wen Qiu ◽  
Pei Yao Xu ◽  
Xiao Bei Dong ◽  
Fan Zhang
Keyword(s):  
Chlorine Dioxide ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Dynamic Test ◽  
Water System ◽  
Cooling Water ◽  
Optimum Concentration ◽  
Secondary Effluent ◽  
Static Test ◽  
Complex Formulation

In this paper, three biocides with different mechanism were chosen to carry static test on screening from single formulation to complex formulation and bactericidal properties. The results showed that the most bactericidal biocide was isothiazolone, and the last was steady chlorine dioxide. The optimum concentration of three biocides in single formulation were isothiazolone10 mg/L, quarternary amine salt 20 mg/L and steady chlorine dioxide 20 mg/L separately. As the best complex formulation, P with optimum concentration of isothiazolone5 mg/L and steady chlorine dioxide10 mg/L, was verified as harmless for environment and also effective inhibition growth of microorganism by dynamic test.

Dynamic Simulation Test on Scale Inhibition of Secondary Effluent of Sewage Treatment Plant Directly Reused in Power Plant Circulating Cooling Water System

2013 ◽  
Vol 473 ◽  
pp. 125-128
Author(s):  
Wen Qiu ◽  
Yi Zhao
Keyword(s):  
Power Plant ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Water System ◽  
Cooling Water ◽  
Secondary Effluent ◽  
Inhibition Effect ◽  
Scale Inhibition ◽  
Circulating Cooling Water

Secondary effluent of sewage treatment plant directly reused in power plant circulating cooling water system was the main cause of scale inhibition in the system.Facing this serious scaling problem,static scale inhibition experiment was carried out to filter out the efficient compound formulation.Corrosion inhibition performance by rotary coupon experiment was studied.Scale and corrosion inhibition effect under the field condition by homemade dynamic simulation experiment and the environment toxicity were tested. The result showed that this water treatment agent gain the high scale and corrosion inhibition effect, with low phosphorus,non-toxic,friendly to environment.

Reuse of treated sewage effluent for cooling water make up: a feasibility study and a pilot plant study

1996 ◽  
Vol 33 (10-11) ◽  
pp. 363-369 ◽  
Author(s):  
Bandupala Wijesinghe ◽  
Ralph B. Kaye ◽  
Cristopher Jospeh D. Fell
Keyword(s):  
Pilot Plant ◽  
Manufacturing Industry ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Cooling Water ◽  
Economic Evaluations ◽  
Secondary Effluent ◽  
Makeup Water ◽  
Biofilm Growth

This investigation was aimed at developing an acceptable technology for using secondary effluent as cooling water makeup for inland manufacturing industry in Australia. Approximate economic evaluations were made for a number of pretreatment alternatives and for internal treatment with chemical conditioning agents. Internal treatment with biocide dosing appeared to be the most promising option. A portable pilot plant scale cooling tower/heat exchanger unit was constructed. The unit incorporated an on-line, differential pressure biofilm monitor together with automated control and data acquisition systems. The pilot plant was installed on site at a sewage treatment plant near Sydney. It was demonstrated that the use of TSE for cooling water makeup is technically feasible. The rate of biofilm growth observed using chlorinated secondary effluent directly from the sewage treatment plant as makeup water was similar to the rate of biofilm growth observed when potable water was used and supplementary chemical treatment was not introduced in either case. Excellent control of biofilm growth was observed in subsequent experiments when supplementary additions of simple chlorine or bromine chloride treatment systems were carried out. The pilot plant was operated successfully at 5 cycles of concentration without any other supplementary treatment being required.

Study on Biological Aerated Filter as Enhanced Pretreatment Process of Coagulation and Sedimentation

2013 ◽  
Vol 726-731 ◽  
pp. 1940-1944 ◽  
Author(s):  
Liang Shen ◽  
Han Xiao ◽  
Wan Qiu Yang ◽  
De Ren Miao ◽  
Xiao Ming Li
Keyword(s):  
Power Plant ◽  
Water System ◽  
Cooling Water ◽  
Ammonia Nitrogen ◽  
Secondary Effluent ◽  
Biological Aerated Filter ◽  
Sedimentation Process ◽  
Cooling Water System ◽  
Circulating Cooling Water ◽  
Aerated Filter

Using coagulation and sedimentation process in the advanced treatment of urban secondary effluent which can be recycled to circulating cooling water system in power plant is only perform well on CODCrand turbidity removal. But the concentrations of organic matter and NH3in effluent can not meet the requirements of circulating cooling water. Therefore, in this study, the feasibility of biological aerated filter (BAF) as a pretreatment enhancing coagulation and sedimentation process was discussed. Achieved by controlling the two operating modes: (1) secondary effluentcoagulation and sedimentationeffluent; (2) secondary effluent BAFcoagulation and sedimentation effluent.The results show that the BAF pretreatment removes ammonia nitrogen effectively, and the turbidity and CODCrof effluent of BAF-coagulation sedimentation process is much lower than individual coagulation and sedimentation process. The final effluent qualities meet the requirements of circulating cooling water system in power plant.

Experimental Studies of CS Type UV Sterilizer for the Urban Sewage Treatment

2013 ◽  
Vol 361-363 ◽  
pp. 601-605
Author(s):  
Ji Ku Zhang ◽  
Yang Yang Li ◽  
Chen Zhang ◽  
Yan Bin Yang
Keyword(s):  
Removal Rate ◽  
Sewage Treatment ◽  
Experimental Studies ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Uv Disinfection ◽  
Secondary Effluent ◽  
Urban Sewage ◽  
High Doses ◽  
Uv Dose

By treating the secondary effluent of Sanbaotun sewage treatment plant in Fushun with the CS type UV Sterilizer, the experiment researches the influence on the removal rate which includes the factors of turbidity, chromaticity, initial E.coli concentration of raw water, UV dose. The results show that the turbidity does not influence on UV disinfection efficiency with the turbidity from 1.5NTU to 3.8NTU. In the low-dose UV disinfection process, the influent sewage turbidity should under 4NTU to ensure the disinfection efficiency. Low chromaticity does not affect the UV disinfection efficiency, with the influent sewage chromaticity is under 15 degrees.The initial E. coli has a certain impact on little doses of UV disinfection with the concentration from 175 × 104 A/ L to 230 × 104 A/ L, no impact on high doses of UV disinfection。

Genotoxicity of Organic Substances in Municipal Sewage and Its Ozonated Products

1992 ◽  
Vol 25 (11) ◽  
pp. 285-291 ◽  
Author(s):  
Y. Ono ◽  
I. Somiya ◽  
M. Kawamura ◽  
K. Uenishi
Keyword(s):  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Test System ◽  
Municipal Sewage ◽  
Secondary Effluent ◽  
Gel Chromatography ◽  
Organic Substances ◽  
Industrial Wastewaters ◽  
Umu Test ◽  
Secondary Effluents

Some organic substances contaminated in industrial wastewaters are not easily decomposed through biological treatment plant. In order to investigate the genotoxicity of the substances which remain in effluent from a municipal sewage treatment plant receiving industrial wastewaters, bacterial and mammalian assays were applied to the concentrated samples of secondary effluent. Ozonation was applied to decompose hard-biodegradable organic matters and to decrease its genotoxic intensity. Genotoxicity was surveyed for the concentrated samples using umu test system which can detect the umuDC genes that are known to cause error-prone repair. Positive results were observed in the case of Sep-pak-methanol extracts of secondary effluents with microsomal activation. Results of umu test showed negative in the ozonated samples of the effluent. Genotoxic substances in secondary effluents were decomposed by ozone into non-genotoxic substances. The concentrated sample was fractionated by gel chromatography using Sephadex LH-20 which can separate the molecule in the range from 100 to 5,000. A fraction of the effluent was determined as positive in umu test. The substances were detected in the range of over 5,000 molecular size.

Innovative Water Treatment Design for Turning Wastewater Treatment Effluent Into Boiler Makeup Water

2003 ◽  
Author(s):  
Donald J. Castro ◽  
R. Peter Stasis
Keyword(s):  
Reverse Osmosis ◽  
Potable Water ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Water System ◽  
Treatment System ◽  
Makeup Water ◽  
Pinellas County ◽  
Pre Treatment

The Pinellas County Resource Recovery Facility (PCRRF) is a 3,150 tons per day mass burn facility located in Pinellas Park, Florida. Due to local water use restrictions and increasing costs for potable water supplies in central Florida, Pinellas County has continuously sought to reduce potable water usage at its facilities. The PCRRF’s boiler makeup water system represented a prime target. Accordingly, a makeup water pre-treatment system using reclaimed water from a sewage treatment plant as its source, has been installed upstream of the existing reverse osmosis membrane and mixed bed polishing demineralizers. The pre-treatment system consists of a micro-filtration module, followed by a reverse osmosis module, which results in an overall configuration of micro-filtration, two stage reverse osmosis, and polishing demineralization. The system has been operational for approximately six months, and is producing excellent quality makeup water for the facility boilers. This paper will describe the pre-treatment process and its operational results to date.

Using Catalyst and Electrolysis Diaphragm Method to Produce Multiple Oxidants to Remove the Scaling and Slime in Cooling System

2008 ◽  
Vol 47-50 ◽  
pp. 339-342
Author(s):  
Kuo Shan Yao ◽  
Chen Yu Chang ◽  
Ta Chih Cheng ◽  
Yung Hsu Hsieh ◽  
Shi Ren Weng
Keyword(s):  
Chlorine Dioxide ◽  
High Efficiency ◽  
Ph Value ◽  
Cooling System ◽  
Water System ◽  
Cooling Water ◽  
Magnesium Carbonate ◽  
Pipeline System ◽  
Circulating Water ◽  
Multiple Oxidants

Increasing cycle of water circulation in industrial cooling water system caused accumulation of dissolving materials in circulating water. Subsequently, the problems including scaling, fouling, corrosion and slime occurred. The multiple oxidants including chlorine dioxide, ozone, peroxide hydrogen, and chlorine were prepared using diaphragm electrolysis method to alleviate the problems above in the cooling system. Meanwhile multiple oxidants can also inhibit the accumulation of biological dirt and erosion effectively. The efficiency of multiple oxidants to inhibit precipitation of magnesium carbonate and calcium carbonate can be increased by adjustment of pH value in the whole pipeline system to reduce corrosion rate of the pipeline and to achieve energy-water saving goal. The results showed that the high efficiency of chlorine dioxide mixture was an excellent bio-corrosion inhibitor and bio-accumulation bactericide. The residue concentration of mixture oxidants are at the range of 0.05 ~ 0.25 mg ClO2/L that is high enough to restrain the growth of micro-organisms.

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