This study systematically investigated the potential of mitigating sulfide induced sewer concrete
corrosion by surface washing. Washing interrupted the corrosion activity of concrete coupons by
increasing the surface pH and decreasing the H2S uptake rates (SUR). The SUR recovered to the level
prior to washing within 60e 140 days. The slowest recovery rate was from the most severely corroded coupon.
However, no significant difference was observed for concrete mass loss of the washed and unwashed
coupons after 54 months. The results suggest that frequent washing at short intervals of a few months
might be needed to control corrosion over a long term.