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11.
投加粉末活性炭对MBR运行性能的影响 总被引：4，自引：0，他引：4
试验研究比较了在相同的进水和运行条件下,反应器1(投加粉末活性炭,投加量为12.3 g,使其质量浓度达到1 100 mg/L)和反应器2(未投加粉末活性炭)的膜透水性及对污染物的去除效果,并分析了粉末活性炭可以提高膜过滤性能的相关机理。试验结果表明：反应器1的膜通量衰减速率明显小于反应器2;投加粉末活性炭改变了混合液的性质,也大大降低了混合液中胞外聚合物和微细胶体的含量,从而减缓了膜通量的下降速度,可以使系统长时间地以相对高的膜通量运行。 相似文献
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改性粘土絮凝法对太平洋牡蛎(Crassostrea gigas)稚贝的影响 总被引：1，自引：0，他引：1
本实验以太平洋牡蛎稚贝(Crassostrea gigas,～0.2cm)为对象,研究了HDTMA有机改性粘土和PAC无机改性粘土絮凝法治理赤潮时对海洋底栖生物的影响。96h急性毒性实验中二者对牡蛎稚贝的半致死浓度(LC50)分别为4.62g/L和2.67g/L。在能够有效去除赤潮微藻的浓度条件下(0.10g/L),经慢性毒性实验发现改性粘土对牡蛎稚贝成活率无影响,牡蛎生长速度较对照组没有明显差异,滤食率比培养实验初始时升高了3～4倍,同时在牡蛎超微组织结构中未发现机械损伤。通过模拟改性粘土去除赤潮生物(Heterosigma akashiwo和Prorocentrum donghaiense)过程中对生物体的影响,发现改性粘土絮凝法通过去除赤潮藻能显著提高牡蛎的存活率,所以HDTMA有机改性粘土和PAC无机改性粘土絮凝法在赤潮生物防控中可以作为一项有效的应急措施。 相似文献
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采用PAC(聚合氯化铝)与PFS(聚合硫酸铁)混凝剂处理污水，并进行了对比实验。结果表明。在污水COD浓度为920mg／L，PFS折算为Fe2O3的投加量为300mg／L，pH为9．0时，出水COD为406mg／L，COD去除率为55．8％，而PAC折算为Al2O3的投加量为120mg／L时，出水COD为369．8mg／L，COD去除率为59．8％。PAC较PFS对COD的去除率高约4％。 相似文献
14.
Capping with layers of inert or adsorptive materials is used to control the release of polycyclic aromatic hydrocarbons(PAH)in sediment but little is known about microbial degradation processes in these materials.A rich native microbial community inhabits the sediment bed,and capping media can influence enrichment and biodegradation activity of benthic microorganisms.The aim of this study was to evaluate the effects of capping media(sand,organoclay,and powdered activated carbon[PAC])on microbial communities under oxic conditions typical of the capewater interface,where naphthalene degradation(model PAH)is likely to be maximized.Bench scale experiments compared naphthalene concentrations,nahAc biomarker abundance,microbial community composition,and cellular attachment in systems amended with adsorptive and non-adsorptive capping materials.Results indicate that activated carbon promoted and enhanced bioactivity;PAC treatments showed high biodegradation rates,nahAc biomarker levels,and attached biological growth consistent with enrichment of the PAHdegrading genus Pseudomonae.In contrast,sand did not enhance biological activity compared to media-free systems.Naphthalene strongly influenced microbial community composition at the species level in all treatments except organoclay,which promoted biological signatures commonly associated with impeding degradation activity.Data overall suggest that adsorptive capping materials can both promote(PAC)and inhibit(organoclay)bioactivity in the surficial layer of caps,indicating that media selection is critical to the design of bioactive capping systems. 相似文献
15.
混凝剂处理钻井废泥浆液的研究 总被引：4，自引：0，他引：4
通过烧杯搅拌实验对混凝剂处理钻井废泥浆液进行研究,从混凝剂适应p H值范围、混凝效果、沉降速度三方面研究比较,找出一种较为理想的混凝剂,并分析了影响混凝剂性能的主要因素,确定了混凝剂的最佳投放剂量。 相似文献
16.
Hannah Della Bosca 《The Australian geographer》2019,50(1):49-68
Deliberative democracy in the form of community participation is considered a ‘key priority’ in New South Wales (NSW) environmental planning. Community participation plays an increasingly central role in state significant developments, which are often sites of contestation. Community participation processes draw upon particular factors of place-based identity, which engage with notions of procedural legitimacy in subtle and not-so-subtle ways. This paper uses a legal geography analysis to explore this link between place-based identity and the experience of procedural legitimacy. We highlight a case study in which a contested coal mining development near Lithgow, NSW was approved by the NSW Planning Assessment Commission (PAC). This analysis examines how ‘local’ justice was constructed and mobilised in specific ways by proponents and opponents alike. Spatial factors of identity manifested in distinct ways in participation processes, particularly with respect to (i) claims to legitimacy and (ii) the lived experiences of engagement in a public forum. This case study demonstrates the way in which dualistic spatial terms such as ‘outsider’ opposition and ‘local’ support can render multiple interests of both human and non-human communities invisible. In so doing we are engaging with current work on environmental justice that examines the intersection of scale, efficacy and equity in processes of environmental governance. 相似文献
17.
In order to improve the coagulation/flocculation efficiency of polyaluminum chloride (PAC), a composite flocculant of PAC and polydimethyldiallylammonium chloride (PDMDAAC), or PAC‐PDMDAAC, was prepared. The chemical species distribution of aluminum in PAC and PAC‐PDMDAAC, which has a close relationship with their coagulation/flocculation performance, was investigated by Al‐Ferron complexation timed spectrophotometry and 27Al‐NMR. The factors affecting the chemical species of aluminum in PAC‐PDMDAAC, such as the weight concentration of PDMDAAC (Wp), basicity (B) of PAC, and viscosity (η) of PDMDAAC, were studied. The flocculation efficiencies of PAC‐PDMDAAC, PAC and PDMDAAC were studied on a six‐spindle multiple stirrer unit. The results showed that the aluminum species distribution in PAC‐PDMDAAC depends on the Wp, B and η value. When the B value is 1.5 and η value is 1.22 dL/g, the composite flocculant with Wp = 15 % gives highest Alb and Al13 contents, and its flocculation efficiency is highest in the test flocculations. 相似文献
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两种改性粘土去除群体状铜绿微囊藻的比较 总被引：5，自引：2，他引：3
实验采用壳聚糖和聚合氯化铝改性高岭土,进行以铜绿微囊藻为优势种的水华蓝藻去除的比较研究,研究采用动力学手段,通过去除效率的比较,得到线性方程:壳聚糖改性高岭土投加量(y)与藻细胞浓度OD68(x)和叶绿素a含量(x)之间的关系分别为:y=0.0349x-0.0019、y=0.0524x-0.009;聚合氯化铝改性高岭土投加量(y)与藻细胞浓度OD68(x)和叶绿素a含量(x)之间的关系分别为:y=0.0351x+0.0065、y=0.0676x-0.0059,壳聚糖改性粘土除藻的最适pH范围为5-8,聚合氯化铝改性粘土除藻的最适pH范围为5-9,pH范围相对较宽,电子传递速率分析表明壳聚糖改性粘土处理后1个月内藻趋于死亡,聚合氧化铝改性牯土处理过的藻,一周内藻开始黄化,衰老. 相似文献