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This paper will provide a review of the specific methods for deactivating the various oxidizing and non-oxidizing biocides commonly used today. Examples of lab and field data will be presented.
Industrial biocides are used for microbial control in a variety of industrial water systems including, cooling, paper, oilfield, and membrane applications. Biocide treatment programs are typically designed to provide optimal results based on environmental conditions, regulatory needs, efficacy, and cost. An important area of concern relating to biocide use is discharge of the treated effluent (ex., blowdown) into waste treatment systems or natural waters. Regulatory requirements also impact the amount of biocide that may be released. In many cases, the biocide must be effectively deactivated or neutralized prior to discharge of the effluent. This paper will provide a review of the specific methods for deactivating the various oxidizing and non-oxidizing biocides commonly used today. Examples of lab and field data will be presented. Keywords: water treatment, biocide, deactivation, oxidizer, non-oxidizer, isothiazolone, glutaraldehyde, dibromonitrilopropionamide, DBNPA, bronopol, tetrakis(hydroxymethyl)phosphonium sulfate, THPS, chlorine, bromine.
A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. The first example is of three generic inhibitors, against localised corrosion. The second is of three industrial inhibitors against existing localised corrosion on a north sea production platform
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Results of inhibitor performance at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and scanning electrom microscope (SEM) techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor.
A convenient protocol for screening the potential efficacy of scale inhibitors is described. All of the techniques used require relatively inexpensive equipment. Two types of scale are addressed in this paper, calcium carbonate and calcium oxalate, but the general procedures are expected to be applicable to inhibitor screening for others as well.