河岸材料对河流有机污染物降解能力的影响

Effect of River Bank Material on Organic Pollution Degradation Capacity

研究了干砌石、浆砌石、蜂巢格宾和生态砖等河岸材料对河流有机污染物降解能力的影响。4种材料中,以生态砖为河岸的河流中总有机碳(TOC)沿程降解率分别是蜂巢格宾和浆砌石的6.14和3.15倍(p<0.05);生态砖、干砌石和蜂巢格宾河段中溶解性有机碳(DOC)沿程降解率分别是浆砌石的10.68、6.60和6.08倍(p<0.05)。生态砖和蜂巢格宾构筑的河岸的河流中,悬浮和附着微生物脂磷含量显著高于干砌石和浆砌石(p<0.05),最多可达到7.27nmolP/cm2和58.16nmolP/cm2,悬浮微生物脱氢酶(S-DHA)、荧光素双醋酸酯(FDA)、附着微生物硝酸还原酶活性(F-NRA)、碱性磷酸酶活性(APA)也显著高于干砌石和浆砌石(p<0.05)。河岸材料影响了微生物生物量及硝化等关键生化反应过程的酶活性,从而影响了河流中有机污染物的降解。

Microbial biomass and enzyme activities for dry masonry, cellular gabion, eco-block and masonry were investigated to reveal the effects of different river bank materials on organic pollution degradation capacity. Total organic carbon （TOC） degradation ratio of eco-block bank were 6.14 and 3.15 times significantly higher than that of cellular gabion and masonry, respectively （p0.05）. Dissolved organic carbon （DOC） degradation ratio of eco-block bank, dry masonry and cellular gabion were 10.6, 6.60 and 6.08 times significantly higher than that of masonry, respectively （p0.05）. Lipid phosphorus contents of suspended microbe and microbial film in river with eco-block and cellular gabion were up to 7.27 nmol P/cm2 and 58.16 nmol P/cm2 ,respectively. Dihydroartemisinin of suspended dehydrogenase activity （S-DHA）, fluorescein diacetate activity（FDA）, nitrate reductase activity of microbial film （F-NRA）, alkaline phosphatase activity （APA） of eco-block were also significantly higher than that of dry masonry and masonry （p0.05）. River bank materials affect organic degradation capacity by microbial biomass and enzyme activities.