Comminutor and Grinder Process

Processing coarse solids reduces their size so they can be removed during downstream treatment operations, such as primary clarification, where both floating and settleable solids are removed.

Comminuting and grinding devices are installed in the waste-water flow channel to grind and shred material up to 6 to 19 mm (0.25 to 0.75 in) in size.

Read Also: Estimating Waste-water Flow Rates from Water Supply Data

Comminutors consist of a rotating slotted cylinder through which waste- water flow passes. Solids that are too large to pass through the slots are cut by blades as the cylinder rotates, reducing their size until they pass through the slot openings.

Grinders consist of two sets of counter rotating, intermeshing cutters that trap and shear waste-water solids into a consistent particle size, typically 6 mm (0.25 in). The cutters are mounted on two drive shafts with intermediate spacers. The shafts counter rotates at different speeds to clean the cutters.

Comminutor and Grinder Process
Fig.: Waste-water Grinder: Channel Unit (WEF, 1998)

The chopping action of the grinder reduces the formation of rag ―balls‖ and rag ―ropes‖ (an inherent problem with comminutors). Waste-waters that contain large quantities of rags and solids, such as prison waste- waters, utilize grinders downstream from coarse screens to help prevent frequent jamming and excessive wear.

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Benadine Nonye

An Agric. Consultant & a Writer (With over 12 years of professional experience in the agricultural industry) - National Diploma in Agricultural Technology - Bachelor's Degree in Agricultural Science - Master's Degree in Science Education... Visit My Websites On: Agric4profits.com - It's All About Agriculture, The Way Forward! Agric4profit.com - The Most Reliable Global Agricultural Forum! Agric4profit.com.ng - The Most Reliable Nigeria's Agricultural Job Board! TheAgriPedia.com - For Everything Premium Agriculture! WealthinWastes.com - For Proper Waste Management and Recycling Practices. Join Me On: Twitter: @benadinenonye - Instagram: benadinenonye - LinkedIn: benadinenonye - YouTube: Agric4ProfitsTV - Pinterest: BenadineNonye4u - Facebook: BenadineNonye

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