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“the importance of pH”

With the public outrage and tough laws against water pollution caused by
industrial waste water, all factories are now strictly controlling discharge of waste. Currently, each local government designates water-quality standards and enforces restrictions. The pH of discharged water is one of the most measured items under water-quality regulations. Although pH does not necessarily indicate a particular kind of pollution, it is closely related with the survival of aquatic life. Abnormal pH can cause settling of halomorphic compounds and pollution of water. Also, each factory is required to treat its waste water to conform to the quality standard for waste water. Measuring pH is important in this process, too. For example, at a plating plant, treatment efficiency is greatly affected by pH of the processing solution when removing cyanide or chromium from waste water.
The pH is a measure of the acidity or alkalinity of water. Pure water has a
pH of 7, which is neutral; under 7 is acidic, above 7 is alkaline or basic.
Values of pH are based on the logarithmic scale, meaning that for each 1.0
change of pH, acidity changes by a factor of 10. Most marine organisms
prefer conditions with pH values ranging from about 6.5 to 8.5. Many species have trouble surviving if pH drops under 5.0 or rises above 9.0. The pH is affected by the level of bacterial activity, DO level, water turbulence and various chemicals in runoff flowing into the water.

A waste’s pH is a measure of its acidic or alkaline quality. Most grasses
and legumes, as well as many shrubs and deciduous trees, grow best in soils
with a pH range from 5.5 to 7.5. If a waste is sufficiently acidic or alkaline5
to move soil pH out of that range, it can hamper plant growth. Acidic waste
promotes leaching of metals, because most metals are more soluble under acidic conditions than neutral or alkaline conditions. Once in solution, the metals would be available for plant uptake or could migrate to ground water. Alkaline conditions inhibit movement of most metals. Extreme alkalinity, where pH is greater than 11, impairs growth of most soil microorganisms and can increase the mobility of zinc, cadmium, and lead. Aqueous waste with a pH of 2 or less or a pH of 12.5 or more meets the definition of hazardous waste under federal regulations (40 CFR 261.22(a)). If the pH of a waste makes it too acidic for land application, you can consider adjusting waste pH before application. Lime is often used to raise pH, but other materials are also available. The pH is also important to consider when developing waste handling and storage procedures

Is Imbalanced pH Really Dangerous?
Yes, it is! Few living thing do well in an overly acidic or alkaline pH medium, the human body least of all! Just as acid rain can destroy plants and alkaline wastes can pollute waterways, an imbalanced pH can corrode all body tissue. This can slowly damage the 60,000 miles of  veins and arteries in the body. If unchanged, an imbalanced pH can disrupt all cellular activities and functions, from the beating of the heart to the basic processes of your brain… An imbalanced pH interferes with everything that makes your body work!