NaCl和KCl盐度对厌氧污泥的驯化及对比产甲烷活性的影响

NaCl and KCl Salinity Acclimations of Anaerobic Sludge and Their Effects on Specific Methanogenic Activity

研究了NaCl和KCl盐度对厌氧污泥的驯化及盐度对厌氧污泥比产甲烷活性的影响。试验表明，当NaCl和KCl盐度为0～10g·L^-1时，絮状污泥A，B的COD去除率均达到87％以上；当NaCl和KCl盐度为20g·L^-1时，絮状污泥A，B的COD去除率分别为84％和74．6％；当NaCl和KCl盐度为30g·L^-1时，絮状污泥A和B均有较差的COD降解效果，且KCl对COD降解的抑制影响大于NaCI。经过驯化后的污泥，10g·L^-1NaCl或KCl都会对颗粒污泥产生SMA促进作用；10g·L^-1NaCl对絮状污泥SMA产生轻微抑制，而10g·L^-1KCl对絮状污泥SMA不会产生抑制影响。20g·L^-1NaCl或KCl会对颗粒污泥SMA产生轻微抑制，而20g·L^-1NaCl或KCl都对絮状污泥SMA产生中度抑制。30g·L^-1NaCl或KCl对颗粒污泥和絮状污泥SMA均产生强烈抑制。

The process of anaerobic sludge acclimation with NaCI and KCl salinity, and their effects on specific methanogenie activity（SMA） were studied in this paper. Results showed that the acclimated granular sludge with NaCl and KCl at salinity concentration of 10 g·L^-1 separately all had the COD removal rate above 87%. The COD removal rate were 84% for NaCl acclimated granular sludge and 74.6% for KCl acclimated granular sludge at the salinity concentration of 20 g·L^-1. The COD removal rate were low for both NaCl and KCl acclimated granular sludge at concentration of 30g·L^-1, and the KCl had the higher inhibition than NaCl on COD removal. Both NaCl and KCl at concentration of 10 g·L^-1 showed stimulation on SMA of flocculent sludge, while 10 g·L^-1 of NaCl showed slightly inhibition on SMA of granular sludge but 10g·L^-1 of KCl had no inhibition on granular sludge SMA. Both NaCl and KCl at concentration of20g·L^-1 could moderately inhibit the SMA of granular sludge. And both of them could strongly inhibit the SMA of both flocculent sludge and granular sludge at salinity concentration of 30g·L^-1 separately.