The impact of wastewater hardness on biochemical systems
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Normally, we pay more attention to indicators such as pH value, temperature, nutrients, biodegradability, VFA, alkalinity, and toxic substances, and rarely focus on water hardness. So, what range is appropriate for wastewater hardness during biochemical treatment? What impact does a hardness level of over 30,000 mg/L have on biochemical systems?
High wastewater hardness, in a sense, means high total salt content, which is unfavorable for the survival and reproduction of microorganisms.
If anaerobic treatment facilitates the inorganicization of sludge, yet 30,000 or more seems too high; it’s unlikely to reach such a level