Effluent Sludge Storage Tanks in New Zealand: Why They Are Used In Water Treatment

Effluent sludge storage tanks are used for the treatment of sludge in wastewater applications. Sludge is a thick, soft mud and typically the by-product of wastewater treatment, industrial wastewater solids, and settled suspension from potable water treatment often containing various types of pathogens.

Typical applications for sludge settlement tanks on small sewage treatment plants, the concentration of food and agricultural waste for anaerobic digestion, removal of grit for water reuse on effluent treatment plants, and concentration of apple mulch after cider fermentation.

Sludge contaminated by chemical pollutants or heavy metals and demands will require a more complex treatment. You can also use a water storage tank covers for wastewater storage.

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What is Sludge Thickening?

Sludge thickening is the reduction of volume by up to 80 %, which can be reached with sludge thickening before further treatment is required. This is where wastewater treatment plants drive the sludge off regularly and usually take place directly in the sludge storage tank.

Dished Base Conical Sludge Tanks

Dish-based or conical sludge tanks are a vital part of operations in a wastewater treatment plant used for the storage of raw effluent.  Treated effluent, final effluent, raw sewage, and sewage sludge are also stored in vertical or conical tanks to hold sludge after it has been removed from the wastewater treatment system and settle out sludge further so more water can be recovered. 

Conical tanks have one main advantage over standard flat base sludge tanks which is that the sludge can be drained through the center.