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Abstract  Some sea mud had been fed in aerobic reactor by natural seawater with nutrients to become activated sludge, we named it marine activated sludge. After ten-week cultivation, its Sludge Volume Index (SVI) increased from 19 to 70 mL/g, while CODMn degradation rate peaked 90% and degradation rate of ammonia nitrogen reached 45% after 12-hour reaction. Furthermore, sludge fed once a day had the highest biodegrability. For carbon source to sludge, dextrose was better than starch in cultivation. We also found that marine activated sludge had a stronger biodegrability in treating saline wastewater and a better stability against salinity shift than the conventional activated sludge. The CODMn degradation rate was over 70% and degradation rate of ammonia nitrogen was over 30% after 12-hour reaction while the salinity was under 6%, which presented applied values of saline wastewater treatment. However, an important degree of biological activity inhibition was observed while the salinity was above 6%. And the marine activated sludge has a higher resistance to salinity variation, even when the salinity is low.
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Some sea mud had been fed in aerobic reactor by natural seawater with nutrients to become activated sludge, we named it marine activated sludge.

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After ten-week cultivation, its Sludge Volume Index (SVI) increased from 19 to 70 mL/g, while CODMn degradation rate peaked 90% and degradation rate of ammonia nitrogen reached 45% after 12-hour reaction. Furthermore, sludge fed once a day had the highest biodegrability. For carbon source to sludge, dextrose was better than starch in cultivation.

¶ÔÓÚº¬ÑÎÓлú·ÏË®µÄ´¦Àí£¬º£Ñó»îÐÔÎÛÄàÒ²±È´«Í³»îÐÔÎÛÄàÓÐÓÅÊÆ£¬ÉõÖÁ¶ÔÓÚº¬ÑÎÁ¿6%µÄ¸ßÑÎÓлú·ÏË®£¬´¦Àí12hºóÄÜ´ïµ½¸ßÃÌËáÑÎÖ¸Êý£¨CODMn£©½µ½âÂÊ´ïΪ70%£¬°±µª½µ½âÂÊ´ïµ½30%¡£
We also found that marine activated sludge had a stronger biodegrability in treating saline wastewater and a better stability against salinity shift than the conventional activated sludge. The CODMn degradation rate was over 70% and degradation rate of ammonia nitrogen was over 30% after 12-hour reaction while the salinity was under 6%, which presented applied values of saline wastewater treatment.

µ±NaClŨ¶È¸ßÓÚ6%£¬º£Ñó»îÐÔÎÛÄàÈÔ¾ßÓÐÒ»¶¨µÄ»îÐÔ£¬µ«ÈÔÄܹ۲쵽Ã÷ÏÔµÄÒÖÖÆ×÷ÓᣴËÍ⺣Ñó»îÐÔÎÛÄà¾ßÓбȴ«Í³»îÐÔÎÛÄà¸üÇ¿µÄÑζȱ仯¿¹ÐÔ£¬ÉõÖÁÔÚµÍÑζÈÏÂÑÎŨ¶È±ä»¯Ê±£¬º£Ñó»îÐÔÎÛÄàµÄ°±µª½µ½âÎȶ¨ÐÔÒ²ÓÅÓÚ´«Í³»îÐÔÎÛÄà¡£
However, an important degree of biological activity inhibition was observed while the salinity was above 6%. And the marine activated sludge has a higher resistance to salinity variation, even when the salinity is low.
3Â¥2011-12-14 14:21:49
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5700230

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[ Last edited by 5700230 on 2011-12-14 at 21:01 ]
4Â¥2011-12-14 20:09:50
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5Â¥2011-12-15 13:41:45
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Some sea mud can be filled in aerobic reactor with natural seawater and nutrients to become activated sludge. It performs good activity in treating saline wastewater and we name it marine activated sludge. After a ten-weeks long cultivation, the Sludge Volume Index (SVI) increases from 19 mL/g to 70 mL/g, while CODMn degradation rate peaks 90% and degradation rate of ammonia nitrogen reaches 45% after 12-hour reaction. Furthermore, feeding sludge once a day has the highest biodegrability. And dextrose is better than starch as a carbon source for cultivation. Also, marine activated sludge has a stronger biodegrability in treating saline wastewater and a better stability against salinity shift than the conventional activated sludge. The CODMn degradation rate is over 70% and degradation rate of ammonia nitrogen is over 30% after 12-hour reaction in the case that the salinity was under 6%, both of which present applied values of saline wastewater treatment. However, an obvious biological activity inhibition is observed in the case that the salinity rate is above 6%. Further, the marine activated sludge has a higher resistance to salinity variation. Even in low salinity, marine activated sludge¡¯s stability of the degradation rate of ammonia nitrogen overmatches conventional activated sludge.
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6Â¥2011-12-15 13:43:24
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