particles of debris and fine matter heavy enough to settle out of wastewater.

the backflow of contaminated or polluted water, from a plumbing fixture or cross-connection into a water supply line, due to a lowering of the pressure in the line.

forms of wastewater treatment in which bacterial or biochemical action is intensified to stabilize, oxidize, and nitrify the unstable organic matter present. Intermittent sand filters, contact beds, t [..]

a fine, solid material which is sometimes added to a wastewater stream to produce clarification or coagulation by adding bulk to the solids.

the quantity of chlorine absorbed by wastewater (or water) in a given length of time.

the process of removing greases and oils from sewage, waste, and sludge.

biological decomposition of organic matter accompanied by the production of a foul smell associated with anaerobic condition.

a method of analyzing the composition of a solution by adding known amounts of a standardized solution until a given reaction (color change, precipitation, or conductivity change) is produced.

any substance capable of giving up a proton; a substance that ionizes in solution to give the positive ion of the solvent; a solution with a pH measurement less than 7.

the quantitative capacity of aqueous solutions to react with hydroxyl ions. It is measured by titration with a standard solution of base to a specified end point.