Abstract

The reclaimed wastewater quality in 34 treatment facilities of combined household wastewater for individual houses were investigated in the rural area in Ehime Prefecture, in Japan. The results showed that saline concentrations in the reclaimed wastewater were varied in each facility. Temporal and seasonal variations of the concentrations will be relatively small. Under the reclaimed wastewater reuse for gardens, the risks of Ca2+, Mg2+, Cl-, SO42- for plant growth will be low. However, the risk of high concentration of EC, Na+, K+ can lead some problem for plant growth or soil permeability. We should respond appropriately to the risks.

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