Low-temperature bioremediation of a waste water contaminated with anionic surfactants and fuel oil

One of the most effective methods aimed to improving the environmental safety is fuel oil combustion in the form of specially prepared water-fuel emulsions. The combustion of water-fuel emulsion in internal combustion engines makes it possible to reduce a rate of low-temperature corrosion at wall temperatures below the dew point temperature of sulfuric acid vapor, to install a condensing lowtemperature heating surface in the exhaust gas boiler that leads to increase the efficiency of boiler. Therefore, it is of great importance to assess the effect of the presence of condensate (water, acid) and pollution on these surfaces on the processes of NOx, SO2 absorption from exhaust gases. Investigations of SO2, NOx and particulate matter emission were carried out on the experimental installation for fuel oil and water-fuel emulsion combustion with different water content. Using condensing heating surface enables to reduce the concentration of NOx and SO2 by 65 %. Experimental studies have shown that condensing heating surface ensures the capture of up to 30 % of particulate matter from the exhaust gas flow.

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Electrochemical study of the stability of ferrates(VI) in low temperature molten hydroxide

Acta Chimica Slovaca ◽

10.2478/acs-2013-0032 ◽

2013 ◽

Vol 6 (2) ◽

pp. 202-205

Author(s):

Kamil Kerekeš ◽

Katarína Švaňová ◽

Ján Híveš ◽

Miroslav Gál

Keyword(s):

Waste Water ◽

Water Treatment ◽

Low Temperature ◽

Waste Water Treatment ◽

Water Mixture ◽

Treatment Technology ◽

Electrochemical Preparation ◽

The Stability ◽

Kinetics Of ◽

By Products

Abstract During last decades interest in ferrates(VI) has increased significantly. On one hand they serve as strong, non-toxic oxidants without harmful by-products and, on the other hand, as an efficient coagulant in both drinking and waste water treatment technology. In this work we focused on the electrochemical preparation of ferrate (VI) salts in eutectic low temperature molten sodium hydroxide - water mixture using pure iron anodes. Some information on the stability and kinetics of decomposition of sodium ferrate(VI) prepared by molten-system electrolysis is discussed. An assumption that electrochemically prepared ferrate(VI) in molten hydroxide media are stable enough to be used especially in the field of waste water treatment was confirmed by our observation.

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Study on the diversity of denitrification bacteria treating with wastewater by using PPGC filler on SBMBBR at low temperature

E3S Web of Conferences ◽

10.1051/e3sconf/202015804002 ◽

2020 ◽

Vol 158 ◽

pp. 04002

Author(s):

Jinxiang Fu ◽

Zhe Zhang ◽

Jinghai Zhu

Keyword(s):

Waste Water ◽

Low Temperature ◽

Activated Sludge ◽

Removal Efficiency ◽

Relative Abundance ◽

High Throughput Sequencing ◽

Denitrifying Bacteria ◽

Nitrifying Bacteria ◽

Ammonia Oxidizing Bacteria ◽

Biological Nitrogen

Aiming at the problem of the low removal efficiency of biological nitrogen-removing of low temperature waste-water, using Polyurethane Porous Gel Carrier (PPGC)-SBMBBR treated low temperature sewage, in compared with conventional SBR,and viaing Miseq high-throughput sequencing technology in analysis of the differences of microbial diversity and abundance of structure on the two reactors of activated sludge, revealed dominant nitrogen-removing bacterium improving the treatment efficiency of low temperature sewage. The results shows that the removal efficiency of the effluent nitrogen and the sludge sedimentation rate of (PPGC)-SBMBBR reactor are significantly improved under the water temperature (6.5±1℃). Adding the filler can contribute to improvement of bacterial diversity and relative abundance of nitrification and denitrification bacterium in the activated sludge system. The main relative abundance of ammonia oxidizing bacteria (AOB),nitrite oxidizing bacteria (NOB),anaerobic denitrifying bacteria, and aerobic denitrifying bacteria in (PPGC)-SBMBBR(R2) are significantly better than SBR (R1),and the R2 reactor can independently enrich the nitrifying bacteria and the aerobic denitrifying bacteria, such as Nitrospira, Hydrogens, Pseudomonas, and Zoogloea. The total relative abundance of dominant and nitrifying denitrifying bacterium increases from 28.65% of R1 to 60.23% of R2, providing a microbiological reference for improving the efficiency of biological nitrogen removal in low temperature waste-water.

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