Abstract
Heavy metal was the biggest obstacles of sludge harmless and resources utilization. Studies have been conducted to investigate the effect of salinity on heavy metal from excess sludge. The static experiments were carried out to observe the release of Cu and Pb at four levels of salinity (20‰, 25‰, 30‰, 35‰). The results showed that Cu and Pb presented a similar trend over time: The concentration gradually increased over time in the early period, when reaching the highest value it begun to decrease, until relatively stabilized. Cu and Pb were more favorable to release in higher salinity levels, especially 35‰. The maximum concentration of Cu and Pb was 0.121ug.L-1 and 1.056 ug.L-1, respectively. And Pb was easier to release than Cu.
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