Abstract
In order to understand the toxicity of mercury on the activity of anaerobic granular sludge, the inhibition and rejuvenation effects of mercury ion (Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> ) on methanogenic production activity of the anaerobic granular sludge was investigated using Smith fermentation method under laboratory condition. The results showed that the Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> had quantitative effect on inhibition of methanogenic production activity of the anaerobic granular sludge. The higher the Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> concentration was, the greater of the inhibition capacity it had. When the Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> concentration was less than 50 mg/l, the activity of anaerobic granular sludge could be easily resumed. However, if the concentration was 100 mg/l, the activity could be mostly resumed. When the concentration was 300 mg/l, the Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> would make an irreversible toxic inhibition on the anaerobic granular sludge. Our results indicated that the anaerobic granular sludge activity was tolerant to Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> up to a concentration of 50 mg/l. Analysis of the amount of coenzyme F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">420</sub> and extracellular polymeric substances (EPS) of anaerobic granular sludge in different Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> concentrations revealed that Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> had conspicuous effects on the contents of coenzyme F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">420</sub> and EPS in anaerobic granular sludge. High Hg <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> concentration would cause substantially decline in coenzyme F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">420</sub> and EPS.
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