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排序方式: 共有436条查询结果,搜索用时 18 毫秒
91.
Yuan Linjiang Han Wei Wang Lei Yang Yongzhe Wang Zhiying 《Frontiers of Environmental Science & Engineering in China》2007,1(1):23-27
In order to achieve simultaneous nitrogen and phosphorus removal in the biological treatment process, denitrifying phosphorus
accumulation (DNPA) and its affecting factors were studied in a sequencing batch reactor (SBR) with synthetic wastewater.
The results showed that when acetate was used as the sole carbon resource in the influent, the sludge acclimatized under anaerobic/aerobic
operation had good phosphorus removal ability. Denitrifying phosphorus accumulation was observed soon when fed with nitrate
instead of aeration following the anaerobic stage, which is a vital premise to DNPA. If DNPA sludge is fed with nitrate prior
to the anaerobic stage, the DNPA would weaken or even disappear. At the high concentration of nitrate fed in the anoxic stage,
the longer anoxic time needed, the better the DNPA was. Induced DNPA did not disappear even though an aerobic stage followed
the anoxic stage, but the shorter the aerobic stage lasted, the higher the proportions of phosphorus removal via DNPA to total
removal.
Translated from Environmental Science, 2004, 25(6): 92–96 [译自: 环境科学] 相似文献
92.
磺胺类抗生素和氟苯尼考(FFC)是浙江省普遍使用的抗生素,在土壤上吸附弱而易于迁移,存在较高的环境风险.近年来,粪源抗生素对农田土壤潜在风险的研究多是在实验室条件下添加粪肥的方式进行,无法评估自然施肥状态下抗生素的污染风险.因此以浙江省长期施用不同肥料(鸡粪、猪粪和化肥)的5种旱地农田土壤[临安(LA)、嘉善(JS)、龙游(LY)、开化(KH)和金华(JH)]为对象,选用4种常用的抗生素[磺胺嘧啶(SD)、磺胺二甲基嘧啶(SMT)、磺胺甲基异噁唑(SMZ)和FFC],进行批量平衡实验,探究土壤不同类型和粪肥类型对抗生素在土壤中吸附的影响.结果表明,4种抗生素在实验土壤中的吸附都较弱,吸附次序为:SMT(1.44~13.23 mg(1-(1/n))·L1/n·kg-1)>SMZ(0.73~6.05 mg(1-(1/n))·L1/n·kg-1)>SD(0.16~5.57 mg(1-(1/n))·L1/n·... 相似文献
93.
94.
间歇式活性污泥除磷的试验研究 总被引:11,自引:0,他引:11
间歇式活性污泥法除磷的试验研究表明,生物除磷需要一定的厌氧条件,且须在厌氧阶段后进行充足的曝气。间歇式活性污泥法的灵活性非常适合生物除磷的环境条件。厌氧与好氧相结合,能够提高磷的去除率或降低出水磷的浓度 相似文献
95.
96.
97.
对序批式反应器 (SBR)用于牛场污水的处理进行了试验研究 ,主要研究了三个水力停留时间 (HRT)和有机负荷率对污染物去除率、出水水质和污泥特性的影响。试验结果表明 ,对 10 0 0 0mg/LCOD牛场污水 ,使用 1dHRT ,相应有机负荷率为 10gCOD/L·d时 ,混合出水COD、TS、VS、TKN和TN的去除率分别为 45 %、2 1.4%、34 .2 %、5 3.2 %和 2 2 .2 % ,上清液出水的分别为 80 .2 %、6 3.4%、6 6 .2 %、75 %和 38.3% ;两种出水的SCOD和NH3 N去除率相同 ,分别为 5 0 .0 %和 76 .5 %。经SBR处理后 ,污泥的沉降浓缩性能也有了比较明显的改善。 相似文献
98.
序批式生物膜法同步除磷脱氮特性研究 总被引:6,自引:0,他引:6
对淹没序批式生物膜法去除有机物和磷及同步部分脱氮的特性进行了研究。其适合的载体装填密度为30%,水力停留时间为9h,其中厌氧3h,好氧6h,进水COD负荷从0.27kg/(m^3.d)到1.32kg/(m^3.d)均可使除磷率达90%以上,脱氮率达50%-60%。淹没式生物膜法除磷脱氮工艺中的优势菌属为假单胞菌属,其次依顺序为气单胞菌属,芽孢杆菌属,微球菌属,硝化矸菌属,生物膜具有生物量大(MLVSS达5531.7mg/L),脱落污泥含磷量高(达5.67%),沉降性好(SVI为101.7)的特点,污泥产率为0.1996kg干泥/kgCOD。 相似文献
99.
Xu Zhengyong Yang Zhaohui Zeng Guangming Xiao Yong Deng Jiuhua 《Frontiers of Environmental Science & Engineering in China》2007,1(1):43-48
The nitrogen removal mechanism was studied and analyzed when treating the ammonium-rich landfill leachate by a set of sequencing
batch biofilm reactors (SBBRs), which was designed independently. At the liquid temperature of (32 ± 0.4)°C, and after a 58-days
domestication period and a 33-days stabilization period, the efficiency of ammonium removal in the SBBR went up to 95%. Highly
frequent intermittent aeration suppressed the activity of nitratebacteria, and also eliminated the influence on the activity
of anaerobic ammonium oxidation (ANAMMOX) bacteria and nitritebacteria. This influence was caused by the accumulation of nitrous
acid and the undulation of pH. During the aeration stage, the concentration of dissolved oxygen was controlled at 1.2–1.4
mg/L. The nitritebacteria became dominant and nitrite accumulated gradually. During the anoxic stage, along with the concentration
debasement of the dissolved oxygen, ANAMMOX bacteria became dominant; then, the nitrite that was accumulated in the aeration
stage was wiped off with ammonium simultaneously.
Translated from Acta Scientiae Circumstantiae, 2006, 26(1): 55–60 [译自: 环境科学学报] 相似文献
100.
Li Jun Peng Yongzhen Gu Guowei Wei Su 《Frontiers of Environmental Science & Engineering in China》2007,1(2):246-250
An aerobic sequencing batch biofilm reactor (SBBR) packed with Bauer rings was used to treat real domestic wastewater for
simultaneous nitrification and denitrification. The SBBR is advantageous for creating an anoxic condition, and the biofilm
can absorb and store carbon for good nitrification and denitrification. An average concentration of oxygen ranging from 0.8
to 4.0 mg/L was proved very efficient for nitrification and denitrification. Volumetric loads of TN dropped dramatically and
effluent TN concentration increased quickly when the concentration of average dissolved oxygen was more than 4.0 mg/L. The
efficiency of simultaneous nitrification and denitrification (SND) increased with increasing thickness of the biofilm. The
influent concentration hardly affected the TN removal efficiency, but the effluent TN increased with increasing influent concentration.
It is suggested that a subsequence for denitrification be added or influent amount be decreased to meet effluent quality requirements.
At optimum operating parameters, the TN removal efficiency of 74%–82% could be achieved.
Translated from Acta Scientiae Circumstantiae, 2006, 26(5): 728–733 [译自: 环境科学学报] 相似文献