Technical discussion: Ion content in wastewater
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This post was last edited by hesonchang214 on 2011-10-13 07:59. Nowadays, many wastewater discharges are subject to strict requirements only with regard to the pH value; but why aren’t there strict limits set for impurities such as calcium ions, magnesium ions, and chloride ions?
Simple sodium, potassium, calcium, magnesium ions, and chloride ions are non-polluting substances, and the solubility of various calcium and magnesium salts in water is limited. Therefore, there are no requirements in the current wastewater discharge standards. Essentially, the aforementioned ions can be expressed by two parameters, namely conductivity and hardness, and these two parameters are found in many standards for reclaimed water and industrial water use.
Some local standards set requirements for chloride ions, such as those regarding environmental emissions in Shandong Province.