Application effect of biocide SW303 in seawater recirculating cooling system
- DOI
- 10.2991/mmebc-16.2016.387How to use a DOI?
- Keywords
- biocide, SW303, concentrated seawater, recirculating cooling, bacteria
- Abstract
This paper is to present our research results of the efficacy of SW303 in term of inhibiting bacteria growth in concentrated seawater and under the process conditions of seawater recirculating cooling system through the rotating specimen test and the dynamic simulation experiments. For our research purpose, two kinds of concentrated seawater were used as the test solution and carbon steel was choosed as the test material. Two sets of device simulating seawater recirculating cooling system were used for study of the adding cycle of SW303. This research has focused on the inhibiting effect of SW303 on the growth of the heterotrophic bacteria and iron bacteria through determination of the bacterial count, corrosion rate of test specimen and total iron content, with the plate count method for heterotrophic bacteria, the most-probable-number(MPN) method for iron bacteria, the weight loss method for analysis of SW303 corrosivity to carbon steel, and the rotating specimen method and the dynamic simulation experiment to simulate the process conditions of seawater recirculating cooling system. The results of our research indicate that 2.5mg/L of non-oxidative biocide SW303 could efficiently inhibit the growth of heterotrophic bacteria and iron bacteria in two times of concendated seawater. And SW303 could inhibit the corrosion of carbon steel efficiently by the function of killing bacteria and was compatible well with corrosion and scale inhibitor. The results of dynamic simulation experiments showed that SW303 can well inhibit the growth of heterotrophic bacteria and iron bacteria in the simulating process of seawater recirculating cooling system. Though the effect of inhibiting the growth of iron bacteria was not ideal in 1# system, the iron bacterial count could be inhibited near the control index in 2# system through shortening the adding cycle of SW303. Moreover, concentration time of seawater did not affect the efficacy of biocide SW303. Thus the main factors affecting the efficacy of SW303 included the concentration and interval time of adding SW303 in the simulating process of seawater recirculating cooling system. Large dose and short adding cycle were advantageous for SW303 to inhibit the growth of heterotrophic bacteria and iron bacteria in the concentrated seawater and the process simulating seawater recirculating cooling system. When there was a litter many of iron bacterial count in the test solution and making-up seawater, it was necessary for designing dose method of SW303 to consider comprehensively the inhibiting effect over two classes of bacteria, especially iron bacteria.
- Copyright
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Yahong Li AU - Zheng Zhou AU - Xiaofang Zhao PY - 2016/06 DA - 2016/06 TI - Application effect of biocide SW303 in seawater recirculating cooling system BT - Proceedings of the 2016 6th International Conference on Machinery, Materials, Environment, Biotechnology and Computer PB - Atlantis Press SP - 1925 EP - 1930 SN - 2352-5401 UR - https://doi.org/10.2991/mmebc-16.2016.387 DO - 10.2991/mmebc-16.2016.387 ID - Li2016/06 ER -