The proper pH range for digested sludge is 6.8 - 7.2. It is the volume in millimeters occupied by 1 g of activated sludge after settling of the aerated liquid for 30 minutes. The continuous aeration of sludge after initial aeration for the purpose of improving or maintaining its condition. Splitter Box A division box that splits the incoming flow into two or more streams. A device for splitting and directing discharge from the head box to two separate points of application.
Fresh wastewater is usually slightly alkaline.
If the pH of the raw wastewater is 8.0, it indicates that the sample is alkaline. If wastewater has a pH value of 6.5, it means that it is acid. Wastwater is said to be septic when it is undergoing decomposition.