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131.
The addition of microbes for treating textile wastewater 总被引:3,自引:0,他引:3
Some strains and culture of bacteria which are able to decolorize dyes and degrade polyvinyl alcohol(PVA) were isolated and selected. A pilot scale facultative anaerobic-aerobic biological process was applied for treatment of textile wastewater containing dyes and PVA. Activated carbon adsorption was used as a tertiary treatment stage, and residual sludge from clarifier returned to the anaerobic reactor again. The pilot test were carried out with two systems. One was inoculated by acclimated sludge, and the another was adding the mixed culture of dye-decoloring and PVA-degrading bacteria for forming biological films, the latter was observed to be more effective than the former. The test has run normally for ten months with a COD loading of 2.13 kg/m3/day, a BOD5 loading of 0.34 kg/m3/day in anaerobic reactor; a COD loading of 1.71 kg/m3/day, a BOD5 loading 0.44 kg/m3/day in aerobic reactor. The pollutants removal efficiency by adding microbes was about 20% higher than that by acclimated sludge. The aver 相似文献
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CO<Subscript>2</Subscript> Mitigation and Renewable Oil from Photosynthetic Microbes: A New Appraisal 总被引:4,自引:0,他引:4
Mark E. Huntley Donald G. Redalje 《Mitigation and Adaptation Strategies for Global Change》2007,12(4):573-608
The only major strategy now being seriously considered for biological mitigation of atmospheric CO2 relies entirely on terrestrial plants. Photosynthetic microbes were the focus of similar consideration in the 1990s. However,
two major government-sponsored research programs in Japan and the USA concluded that the requisite technology was not feasible,
and those programs were terminated after investing US$117 million and US$25 million, respectively. We report here on the results
of a privately funded US$20 million program that has engineered, built, and successfully operated a commercial-scale (2 ha),
modular, production system for photosynthetic microbes. The production system couples photobioreactors with open ponds in
a two-stage process – a combination that was suggested, but never attempted – and has operated continuously for several years
to produce Haematococcus pluvialis. The annually averaged rate of achieved microbial oil production from H. pluvialis is equivalent to <420 GJ ha -1 yr-1, which exceeds the most optimistic estimates of biofuel production from plantations of terrestrial ``energy crops.' The
maximum production rate achieved to date is equivalent to 1014 GJ ha-1 yr-1. We present evidence to demonstrate that a rate of 3200 GJ ha-1 yr-1 is feasible using species with known performance characteristics under conditions that prevail in the existing production
system. At this rate, it is possible to replace reliance on current fossil fuel usage equivalent to ∼300 EJ yr-1 – and eliminate fossil fuel emissions of CO2 of ∼6.5 GtC yr-1 – using only 7.3% of the surplus arable land projected to be available by 2050. By comparison, most projections of biofuels
production from terrestrial energy crops would require in excess of 80% of surplus arable land. Oil production cost is estimated
at $84/bbl, assuming no improvements in current technology. We suggest enhancements that could reduce cost to $50/bbl or less. 相似文献
134.
模糊综合评价法判别堆肥腐熟度研究 总被引:23,自引:0,他引:23
对堆肥腐熟程度的评估方法作了研究,首次提出以模糊数学为基础,综合表观指数、碳氮比降解率、平均耗氧速率、微生物量、氨氮变化率等指标的模糊评估法。结果表明,该法全面、简便,有效地量化了堆肥的腐熟度。 相似文献
135.
以对亚硝基-N,N-二甲基苯胺盐为指示剂,测定化合物对降解微生物的毒性,测定条件为:温度25℃,菌种投加量之1ml/L沉降0.5h活性污泥,指示剂浓度1mg/L曝气量400ml/min,作用时间4h,实验证明,当指示剂显著降解率〉70%时无为毒,〈30%为毒性较大,当降解率为50%其毒性浓度抑制值与文献数据基本一致。 相似文献
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Supriyanka Ran Puranjan Mishr Zularisam ab Wahi Sveta Thakur Deepak Pant Lakhveer Singh 《环境科学学报(英文版)》2020,32(3):47-64
In an era of electronics, recovering the precious metal such as gold from ever increasing piles of electronic-wastes and metal-ion infested soil has become one of the prime concerns for researchers worldwide. Biological mining is an attractive, economical and non-hazardous to recover gold from the low-grade auriferous ore containing waste or soil. This review represents the recent major biological gold retrieval methods used to bio-mine gold. The biomining methods discussed in this review include, bioleaching, bio-oxidation, bio-precipitation, bio-flotation, bio-flocculation, bio-sorption, bio-reduction, bio-electrometallurgical technologies and bioaccumulation. The mechanism of gold biorecovery by microbes is explained in detail to explore its intracellular mechanistic, which help it withstand high concentrations of gold without causing any fatal consequences. Major challenges and future opportunities associated with each method and how they will dictate the fate of gold bio-metallurgy from metal wastes or metal infested soil bioremediation in the coming future are also discussed. With the help of concurrent advancements in high-throughput technologies, the gold bio-exploratory methods will speed up our ways to ensure maximum gold retrieval out of such low-grade ores containing sources, while keeping the gold mining clean and more sustainable. 相似文献
138.
人类活动引起的大量的活性氮从大气沉降到生物圈.当前氮沉降对草地生态系统碳循环过程的影响机制仍然存在较大的不确定性.本文综述草地生态系统碳循环过程(植物光合作用、地上生物量、地下生物量、土壤呼吸、凋落物分解和土壤有机碳含量)对添加不同的氮源水平和不同施氮年限的响应,并分析这些过程变化的可能原因,同时,也阐述草地碳循环关键过程对外源碳输入的响应,并进一步分析了外源碳和氮输入对草地碳循环关键过程影响的微生物学作用机制.通过上述总结旨在强调说明碳源可利用性变化作为氮沉降背景下草地生态系统碳循环关键过程重要调控因素之一,开展相关研究对科学的管理我国草地资源配置和增加土壤碳汇方面理论的重要意义. 相似文献
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