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The unstable treatment of produced water was one of the puzzles for the exploitation of extra-low permeability oilfield. This work was to give a comprehensive estimation for the characteristic of the extra-low permeability oilfield produced water. For this purse, the produced water samples were collected from the produced water treatment plant located in Daqing. The physical, chemical and microbiological...
Biosolid (BS) contains nutrients, organic matters, and microorganisms that are beneficial in facilitating the remediation of soil contaminated by polycyclic aromatic hydrocarbons (PAHs). In this study, BS applied to toluene and naphthalene-contaminated soils to investigate its effect on the enhancement of the biodegradation rate and removal efficiency. Experimental results indicated that the presence...
In the straw biogas fermentation with high concentration, ratio of nitrogen and amount of seeding material have significant effect. Experiments show that gas production is very high in early time when the urea addition level is 2.5% or 3.0%, but the methane content of gas is less than 45%. when the urea proportion is 3.5%, the gas production curve is gently, the fermentation starting time is short...
The activated sludge from the nitrification section of secondary settling tank in municipal sewage treatment plant is cultured to obtain the nitrobacteria and then inoculates them to the columnar activated carbon in the bio-tricking filter to remove nitric oxide from waste gas. The test studies the effect of the pH of circulating fluid, the circulating fluid flow rate, the empty bed residence time,...
Hexane extracts of Potamogeton maackianus were fractionated using silica gel column chromatography under room pressure by antialgal activity-guidence. Ten fractions were obtained and three of them shown obvious antialgal activities. These three active fractions were further separated using gel chromatography (Sephadex LH-20). Then the active fractions Fr 3-5, 3-7 and 3-8 were obtained and their percentage...
Manganese peroxidase(MnP) was the most common lignin-modifying peroxidase produced by almost all wood-colonizing basidiomycetes causing white-rot and various soil-colonizing litter-decomposing fungi. MnP could be applied in biotechnological applications, removing of hazardous wastes or in certain organic syntheses. In the present study, some characters of the amino acid sequence of P.sordida manganese...
Phosphine (PH3) is a natural gaseous carrier of phosphorus in its biogeochemical cycles, has been found ubiquitously present in the environment. The origin of phosphine in various environmental sites is still under debated, although phosphine evolution used to be reported from microbial habitats. The tentative experiments show that phosphine gas could be produced by aqueous or acid corrosion from...
Soil pollution is a worldwide problem. Both inorganic and persistent organic pollutants (POPs) possess high toxicity and long-term persistence. Biosurfactant based remediation technologies for contaminated soil are of increasing importance recently, and they have been demonstrated to be effective in uptaking both heavy metals such as Cd, Pb, Zn, Cu, and organic pollutants like hydrophobic organic...
The acute toxicity of herbicide atrazine to a species of green algae Scenedesmus obliquus, a species colorless heterotrophic flagellate Bodo saltans and two species of ciliates Tetrahymena priformis and Oxytricha saprobia was examined in laboratory tests. The results showed that the acute toxicity of atrazine to S. obliquus, B. saltans, T. priformis and C. pyrenoidosa was high. The median effective...
Pineapple guava (Feijoa sellowiana Berg.) is a great commercial plant for its fruit quality and unique flavor. Some key genes expressed in floral organs play significant roles in governing the transition from the juvenile to the adult stage. To clone these genes, high-quality RNA of floral organs were required. In this study, total RNAs were isolated and compared from pineapple guava floral organs...
This paper deals with the problem of robust control for continuous bioprocesses. According to the material balance equations of continuous bioprocesses, a uniform framework for mathematical modeling of this class of processes is first presented. Then a robust controller is designed by using the H?? mixed sensitivity method for the bioprocesses. Finally, the proposed H?? control strategy is applied...
In this work, a new approach to generate a functionalized film on the electrode for molecular diode application is presented. Phenol-grafted chitosan was used as the functionalized film. The anodic oxidation of phenol initiates grafting to the chitosan film and the grafted moieties confer electrochemical activity to the film. Dependent on kinds of mediator, the grafted moieties can serve as an electron...
The performance of pilot scale hybrid process of fluidized biofilm process, chemical coagulation and ultrafiltration system for surface water treatment was studied. In order to remove ammonia nitrogen (NH4+-N) and DOC efficiently, fluidized biofilm process with entrapped nitrifying bacteria pellets and powder activated carbon was applied to the hybrid process. FeCl3ldr6H2O and 7 mg (Fe)/l were determined...
Now transition from synthetic vinegar to microbiological, development of effective technologies of its reception is actual. With the purpose of decrease in the cost price spirit vinegar in structure of nutrient medium Acetobacter aceti instead of expensive ethyl spirit cheaper raw material - a concentrate of head impurity of ethyl spirit (CHIES). Are certain optimum concentration CHIES in a nutrient...
To screen stimulators for mycelial growth and polysaccharides production of Ganodermalucidum, the fungus was inoculated into the media with and without supplementation of several fatty acids and ether extracts of Chinese medicinal insects. Palmitic acid at 1.0 g/L lead to significant increase in both biomass and extracellular polysaccharides (EPS) concentration from 7.73 plusmn 0.41 to 10.21 plusmn...
In order to draw a conclusion of the average longitudinal removal rate of variant forms organics and presents the influent concentration and the hydraulic load curve, the removal rate and form change of the organic pollutants with the different height of the CRI are analyzed. The results indicated that: Under this experimental condition, the reduction of the organics in the CRI mainly occurred within...
Most studies concerned with the interactions between plasma discharges and bacteria have mainly focused on the germicidal effects and inactivation mechanisms, with little attention given to the survivor bioeffects, such as changes in metabolism. This paper investigated the production of 1,3-propanediol (1,3-PD) from glycerol by Klebsiellapneumoniae after exposure to dielectric barrier discharge (DBD)...
Non-thermal pasteurization of fruit juices, such as orange juice using electrical pulses is gaining momentum due to their attractive attributes, such as less heating and more retention of taste, flavor and color. Using electrical pusles of suitable intensity (V/cm) and duration or pulsewidth (milli/micro/nano seconds), it is possible to pasteurize the juices to enhance their longevity (at room temperatures)...
The objective of this paper is to investigate the force behavior and elasticity (plasticity) of living Drosophila embryos at different stages using an in situ PVDF (polyvinylidene fluoride) piezoelectric micro-force sensor with sub-muN resolution. The Drosophila embryo is one of the most studied organisms in biological research, medical research, genetics and developmental biology, and has implications...
Carbon dioxide, as the end product of fossil fuel combustion, is responsible for the global warming. To decrease emissions of CO2, a new method that directly converts CO2 into ethanol is proposed here, and hydrogen is demonstrated to be the most suitable electron donor. The bacteria, Clostridium ljungdahlii and Moorella sp. HUC22-1, are anaerobic microorganisms which may be used to facilitate the...
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