eTutorPhysics

pH	the negative logarithm of the hydrogen ion concentration (-log10[H+]) where H+ is the hydrogen-ion concentration in moles per liter. Neutral water has a pH value of 7.

pH adjustment	a means of maintaining the optimum pH through the use of chemical additives.

potable water	water suitable for drinking or cooking purposes from both health and aesthetic considerations.

precipitant	a chemical or chemicals that cause a precipitate to form when added to a solution.

precipitate	the discrete particles of material separate from the liquid solution.

pretreatment	any wastewater treatment process used to partially reduce pollution load before the wastewater is introduced into a main sewer system or delivered to a treatment plant; a substantial reduction of the pollution load.

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

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