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In order to fully explore and comprehensive utilization the resource of Dictyoploca japonica, the pupa protein was extracted form pupa of Dictyoploca japonica by sodium hydroxide in this study. The pH of the solubility of protein had been determined. The best condition of extracting pupa protein: the concentration of NaOH is 1.5%, with the temperature 70??, the time 3 h and the pupa powder should...
Textile effluents are major industrial polluters. The present paper aims to investigate and develop low cost adsorption methods for color removal wastewater using waste materials raw (RP) and activated carbon (ACP) from plane tree yellow leaves as adsorbent. The method was applied for the removal of direct red 81 while the influence of various factors such as adsorbate concentration and pH were studied...
The effects of pH on the hydrolysis and acidification from WAS in mesophilic and thermophilic anaerobic fermentation was investigated in this study. Both the mesophilic and thermophilic waste activated sludge (WAS) hydrolysis were improved significantly at alkaline pHs than at other pHs. Themophilic conditions improved the WAS hydrolysis compared to that mesophilic ones. The accumulation of short-chain...
The aim of this work is to investigate the hydrogen generation from hydrothermal water by using hydrogen sulfide as a reducer. The effects of reaction temperature, reaction time and the initial pH value of reaction solution on the production of hydrogen from hydrothermal water were investigated. The experimental results showed that hydrogen was produced from water when the reaction temperature was...
Here we present the design and fabrication of ultra sensitive nanowire nanosensors primarily for the detection of biosubstances. It is an autonomous high signal-to-noise ratio system with read-out electronic circuit capable to measure four nanowires simultaneously. The system response to the pH buffer solution was tested and found to be 8.83 mV per pH with the noise background level of 200 ??V RMS...
High spatial-resolution Hymap airborne hyperspectral data was used to generate predictive pH maps of acid mine drainage (AMD) for the Sotiel-Migollas mine complex, Southwest Spain. These maps portray the spatial distribution of highly acidic areas, which are likely associated with high concentrations of heavy metals. A predictive pH model was built using partial least squares (PLS) analysis to determine...
Effects of recirculation leachate quality, hydraulic load and frequency on leachate from fresh municipal refuse were investigated in a bench-scale experiment. Recirculation hydraulic load and frequency can affect quality of lechate from fresh refuse. It is testified that the lower COD concentration of leachate re-circulated into the fresh refuse landfill layer contributed to the improvement of leachate...
Titanium dioxide nanotubes were prepared and used as catalyzers for titanium dioxide nanotubes/UV/O3 to degrade humic acid. And the optimal parameters of titanium dioxide nanotubes/UV/O3 were investigated. The combined treatment showed the synergetic effect of photocatalysis and ozonation. When calcined at 400degC, titanium dioxide nanotubes had the best catalysis for photocatalytic ozonation. With...
In a phosphate buffer medium of pH 7.0, free iodine liberated through the oxidation of I- by IO3-, reacts with excess I- to form a binary complex of I3-, which reacts further with CTMAB to form a ternary ion association complex of CTMA+ldrI3-. This ternary complex is easily soluble and kept stable in organic solvents, in which it has absorption maximum at 365 nm. In the presence trace amounts of...
Hexachlorocyclohexane (HCH) was one of the major organochlorine pesticides (OCPs) in the water and sediments of the Peacock River in Xinjiang, China. Analyzing the water and sediment samples by gas chromatography-electron capture detection (GC-ECD), it showed that all the HCH isomers (alpha-HCH, beta-HCH, gamma-HCH and delta-HCH) could be found in the sediment, and the range was from 0.13 ng/g to...
Chironomus kiiensis larvae which cannot be exterminated by conventional disinfection process propagates prolifically in eutrophic water body, and it therefore turns to be a potential problem encountered in drinking water quality. In this paper, comparative experiments on the inactivation of the fourth instar larvae of Chironomus kiiensis in distilled water by chlorine, ozone and chlorine were conducted...
A methodology of pretreatment for the determination of alkyl-mercury compounds in aqueous samples using capillary gas chromatography (GC) was described, which mainly comprised of sulfhydryl cotton fiber (SCF) adsorption/NaCl-HCl elution/toluene extraction. The factors with regard to the effect of adsorption were evaluated, which involved pH value and flow through SCF tube. The other factors affecting...
The strain F2 which produce excellent flocculating substance were isolated from soil samples and identified as Rhizobium radiobacter. The isolates F2 produced the flocculating substance during the late logarithmic growth phase and the early stationary growth phase. It was founded that the flocculation activated substances of BF distributed mainly in upper phase and were mainly composed of polysaccharide...
This paper uses the closed circulatory coal gas of coking plant to replace water vapour of the traditional ammonia stripping method to treat coking wastewater containing ammonia. The removing rate of NH3-N is 99.57% in the intermittent experimentation, the target of NH3-N can reach the national discharging second standard. On the basis of this, by simulating industrialization continuous experimentation,...
One emulsion liquid membrane system has been established, and the effect factors such as the quantity of carriers , the quantity of surfactants, the concentration of acid in internal aqueous phase, the pH in external aqueous phase, the ratio of oil and internal aqueous phase, the ratio of emulsion and external aqueous phase, the time for distill, rotational speed and time for making emulsion, the...
To detection of organophosphorus in spinach, the plant esterase was immobilized in magnetic chitosan bead by using glutaraldehyde as the cross-linking reagent and used for fast detection of organophosphorus pesticides. The best efficiency of immobilization could be obtained under the condition that the concentration of glutaraldehyde was 2.5%, the pH of glutaraldehyde was 5.5, the adding amount wheat...
Using four sets of self-designed devices, the simulation experiment was carried out, which lasted 11 months. By monitoring the content of volatile solid, fats, crude fiber and humic acid, the anaerobic degradation law of the organic fraction of municipal solid waste (OFMSW) was studied. The results show that: (1) OFMSW degradation amount takes up 82.3% of the total at the acidification stage, so the...
The influence of Fe-deficiency on exudation of low molecular weight organic acids (LMWOAs) were investigated based on the hydroponic culture experiment. Tartaric, citric, malic, and acetic acids were chosen as representatives of LMWOAs commonly present in roots exudation. We also investigated the influence of Fe-deficiency on pH of rhizosphere. The results showed that Fe-deficient excreted large amounts...
In this paper, landfill leachates and vacuum technique were investigated. Conditions for the removal and reclaim of high content ammonia from landfill leachates were studied by vacuum method; the device made on the spot was used to find the optimal experimental procedures. While the operating time was 1.5 hours, the temperature was of 50degC, a vacuum degree was 1.5 m water column, and the highest...
A high efficient aerobic denitrifying bacterium (G2) capable of rapid removal of NO3 and NO2 was isolated from activated sludge. The purpose of this work was to study the characteristics, pH and temperature effects of the isolated bacterium. The morphology of the isolated aerobic denitrifier G2 was a short bacillus, with average size of (0.3~0.6) mumtimes(1.4~3.0) mum. According to the 16S rDNA sequencing...
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