The effects of anaerobic conditions and aerobic conditions on the adsorption of Ca 2+ by activated sludge were studied in this paper. Two reactors, anaerobic bioreactor and aerobic bioreactor were set up to study the adsorption regularities of Ca 2+ by activated sludge, and high calcium wastewater was onself-matched by CaCl2 in this research. We discussed the factors in the process by means of orthogonal text method. Experimental results showed the main influencing factor of the Ca 2+ adsorption by activated sludge was the pH of influent. Under the best adsorption process, the adsorption and removal of calcium ions were 15.04% (anaerobic) and 13.73% (aerobic). Based on the result of the orthogonal text method, we explored the effects of different influent pH for the index parameters of activated sludge. The results showed that with the increase of the pH of influent, the adsorption quantity of Ca 2+ by activated sludge increased while the pH value was less than 10.87. When
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