Treatment of wastewater with environmentally safe lime slurry improves the quality of the treated water. Lime slurry is commonly used by municipalities to purify drinking water. It is used in many commercial and residential water softening systems, as it gets rid of hard water and improves the taste of well or treated water.
The quantity of water needed is determined by both the specific properties of the slaked lime and the kind of hydration equipment available. Hydrated lime forms readily as a suspension or slush and is often piped to numerous process areas inside industrial operations.
Hydrated lime is utilized in many industrial applications, including water treatment, anti-stripping agents in asphalt, and soil stability. Some moist limes are also available on the food-grade market. The substance is often marketed in 50-pound bags or in bulk, which is carried in pressurized transport vehicles or rail tankers cars.
Lime is utilized in many water treatment facilities to maintain an optimal pH level by adding it to the influent. Lime is often kept as granules that are blended with water or other chemicals to form a lime slush that can be circulated via piping and supplied to the waste material as required. Lime slurry is mildly abrasive, but depending on the other compounds present, it may be extremely corrosive.
Lime may also accumulate as scale within pipelines and valves. Traditional quarter-turn valves may be significantly hampered and flow restricted as a result of this scaling. Traditional valves also have the issue of dewatering, which occurs when the pressure is turned down. The upstream pressure inside the line ahead of such a valve will drive liquid out from the lime, leaving behind a dry clog.
This clog is hard enough to prevent a quarter-turn valve from opening, necessitating the use of such cheater bars to expand valves. The most typical outcome is broken stems. The elastomer sleeve's form varies as it opens and shuts, breaking up hardened lime and allowing it to flow. In addition, there are no voids or dead spots where lime might collect.
Waste-activated sludge operations that use lime for stabilization need mixing systems that can manage the high viscosity fluid without blocking or shutting down the system. The dynamic motion of the elastomer blowers prevents calcium buildup on the unit's exterior, allowing the system to function without maintenance difficulties.
Lime is the most often utilized chemical in the restoration of drinkable (https://en.wikipedia.org/wiki/Drinking_water) and industrial water sources in terms of yearly tonnage.
Many towns utilize lime to enhance water quality, particularly for the water treatment process and arsenic removal. Actually, an American Water Works Association recently published rules allowing the use of lime in the purification of drinking water.
Hydrated lime is used in water softening to eliminate the carbonate "hardness" of water. Noncarbonate hardness is produced by various calcium and magnesium compounds and is often addressed using the lime-soda technique, which involves the precipitation of magnesium via lime.
The calcium salt formed in the co-production combines with the soda ash to generate a calcium-carbonate precipitate. Arsenic may also be removed from water using lime-enhanced softening. Stricter arsenic drinking water restrictions have boosted the demand for this procedure.
Hydrated lime is often used to alter the pH of the water before further treatment. Lime can also be used to counteract "red water" by negating the acid water, hence minimizing acidic water deterioration of pipes and mains. Carbon dioxide levels in the corrosive waters are quite high. Lime dissolves CO2 to generate calcium carbonate, which serves to protect the coating on the interior of water mains.
Lime limits the environment necessary for the development of bacteria and some viruses by elevating the ph level to 10.5-11 and holding the liquid in connection to lime for 24-72 hours. Because chlorine treatment produces unappealing water owing to the presence of phenol, this application using lime is used when "phenolic water" occurs. This technique, known as 'excess alkalinity treatment,' also eliminates the majority of heavy metals.
Dolomitic lime is one of the most often used ways of eliminating silica from water. This lime's magnesium component is the active ingredient in silica elimination. Lime is also used to purify water by removing manganese, fluoride, organic tannins, or iron.