By Nicholas G. Pizzi
This box advisor presents a convenient reference for operators to exploit in the course of day- to-day upkeep and operations of filters within the remedy vegetation. a number of universal challenge matters are mentioned in addition to the appropirate strategies. assurance comprises backwash.
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Usually accomplished by backwashing the bed and gradually reducing the backwash rate so that larger but lighter particles rise to the top, and smaller but heavier particles sink to the bottom. Recycle—in filtration, the return of spent filter backwash water (SFBW) to the head of the plant for retreatment. Rewash—filter to waste. Sieve analysis—in filtration, an analytical technique used to determine the size distribution of filter media. Support gravel—a layer of gravel used to support the filter media in a filter bed.
Disposal of the chemicals after they have been applied to the filter media is a concern, too. The wastes cannot be put into the clear well, and they may have an impact on the disposal site, also. If wash water is recycled, the acids or alkalis will be sent back to the treatment process usually with dire consequences. Clearly, chemical cleaning is a process that needs a good plan. These steps are often the domain of a professional contractor. For carbonate deposits in lime-soda plants, acids are used.
Maintenance of filters includes periodic inspection and evaluation techniques to ensure that each filter is operated and backwashed properly and that all parts of the filter will work as expected. Inspection procedures include bed depth measurement, media analysis, solids retention analysis, visual inspection of the bed and support underdrains, and other inspection, sampling, and record-keeping techniques. Routine filter bed maintenance is accomplished by backwashing, but maintenance alternatives may include media replenishment or replacement, acid-washing of the media, mechanical scrubbing through manual means, and reconstruction of damaged units.
Filter operations field guide by Nicholas G. Pizzi