By Leonard Casson, Jim Bess
Because the implementation of the USEPA fresh Air Act danger administration Plan, many water therapy and wastewater therapy utilities have switched over to on-site sodium hypochlorite new release. Conversion to On-Site Sodium Hypochlorite new release: Water and Wastewater purposes is a entire textual content and layout handbook for on-site sodium hypochlorite new release platforms. It covers all matters about the layout, development, operation, and upkeep of on-site sodium hypochlorite new release structures and their program for disinfection in water and wastewater remedy amenities.
The textual content incorporates a concise dialogue of regulatory specifications for chlorination structures and offers a finished checklist of apparatus and development fabrics for either brine and seawater electrolysis platforms. Conversion to On-Site Sodium Hypochlorite iteration will offer layout engineers, operators, and software directors with the operating wisdom of on-site sodium hypochlorite iteration approach layout issues and operational standards had to arrange and enforce a threat administration Plan.
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Additional info for Conversion to On-Site Sodium Hypochlorite Generation: Water and Wastewater Applications
Cell modules are usually designed with vertically mounted cells series both hydraulically and electrically. Multiple cell racks are combined for complete systems to meet various disinfection demand requirements. Pepcon recommends that deposits be removed using a 5% nitric acid solution. Pepcon recently designed and built a cell using DSA type coated titanium plate material in a pipe arrangement. This cell uses multiple flow paths over the electrodes to reduce cathodic fouling. The cells are mounted horizontally on a rack one above the other where a feed header will distribute the seawater into the bottom cell at multiple points for flow over the electrodes.
Electrical bus bar needs are not reduced in this configuration because the power requirements are the same regardless of cell orientation. Hydrogen is normally passed through the cell circuit. Early Diamond Shamrock Sanilec cell modules contained a hydrocyclone to remove the hydrogen interstitially from the cell circuit. There is a small power consumption savings (1–3%) when hydrogen is removed in this manner. The removed hydrogen is then inserted into the product discharge line to be carried to a shock dosing tank for air dilution, through a second removal cyclone for discharge to atmosphere or sent directly to the dosing point.
Joining methods are important to consider with these materials. The most common joining methods are solvent cementing, threading, and flanging. Natural stress relieving properties inherent in PVC and related polymer compounds, with few exceptions, generally prevent reliable threaded joints. Threaded connections present the most difficulty in achieving reliable leak-free performance. Field experience has proven that commonly used Teflon tape causes the threaded female fitting to randomly split and leak.