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SBR process of A/O/A/O many-point-water-inflow mode was investigated to treat landfill leachate. When the HRT of four stages were respectively A(2.0h)/O(10.0h)/A(2.0h)/O(6.0h), the influent of two anoxic stages were added in the proportion of 2:1, excretion ratio was 1/3, pH of influent was 7.5~8.0, the results showed that the removal rate of CODCr, NH3-N and TN were 71.7%, 92.4% and 69.8% respectively...
The biodegradation extent of several alkyl xanthate collectors has been determined according to ISO 7827 and the kinetic model of biodegradation has been discussed. Meanwhile, the impact of molecular structure on biodegradability has been studied. The results indicated that the biodegradation extent of ethyl xanthate, n-butyl xanthate, n-amyl xanthate, isopropyl xanthate and iso-butyl xanthate can...
Control-effective flux(CEF) analysis is a useful tool in assessing a metabolism. In this work, a model that utilizes existing knowledge of oxygen and redox sensing/regulatory system to assist elementary flux modes (EFMs), has been developed and CEF analysis was performed to analyze the influence of oxygen level on the transcriptional regulation in Klebsiella pneumoniae. It was found that the efficiency...
Deoiled Jatropha curcas seed meal (DJSM), a chief waste material of oil extraction industry, will be generated on a large scale due to the growing interest in using Jatropha curcas seed oil as a feedstock for the production of biodiesel. Up to now, there is very little work on viable approach for the use of DJSM to the best of our knowledge. This article reports our studies on the utilization of this...
Poultry litter, municipal solid waste and corn straw were conducted in static vessel to testify the practicability of aerobic co-composting with C/N ratio at 15, 20 and 25. Various kinds of nitrogen transformation were determined at different composting stages. C/N ratios of three treatments all tended to decrease and it was remarkable at the treatment of PMC25 during composting. The total nitrogen...
This paper presented the operation results in the full-scale suspended carrier biofilm (SCB) process for the treatment of the low C/N ratio monosodium glutamate wastewater (MSGW). After the long-term operation of 185 days, the removal efficiencies of COD, total nitrogen (TN) and ammonia nitrogen (AN) achieved above 89.5%, 91% and 92.5% at the influent organic loading rate (OLR) of 1.25-1.8 kgCOD/(m...
Fly ash is waste which severely affected the healthy of people. To utilize it, the mineralogy properties must be studied. By using multielement chemical analysis, the principle chemical composition was analyzed. By using X-ray, electron probe, spectrum analysis testing methods, the cenospheres which are the main component of fly ash surface morphology and the differences of the components were mainly...
The effectiveness of coagulation/flocculation/ sedimentation (CFS), carbon adsorption, and CFS+carbon adsorption for advanced treatment of a biologically treated coking plant effluent was studied. The CFS treatment was cost effective for producing an effluent reusable as cooling water (CODCr<;100 mg/L). Carbon adsorption accomplished the same recycling treatment at a higher cost. Both carbon type...
The effects of salinity and humic acid (HA) on di-n-butyl phthalate (DBP) adsorption by nutshell-based activated carbon were studied by batch experiments in this paper. Adsorption kinetics was evaluated. The kinetic curves were almost the same both in the presence and absence of NaCl, and second time adsorption occurred in the presence of HA. Three kinetic models, pseudo-first-order, pseudo-second-order...
To investigate the possibility of the rapidly starting of the SBR reactor, the start-up effect of aerobic granular sludge cultivated with and without nuclei were compared at low temperature. In the reactor which added aerobic denitrification biofilm debris as nuclei, aerobic granular formed after 30 days of operation at 20°C, the average diameter of granular achieved 7.8mm, MLSS was above 12.275g/L,...
Biofilm performance at various bed expansion ratios was investigated in an aerobic biofilm fluidized bed. As the bed expansion was increased from 20 to 35%, bioparticle collision resulted in the decrease of biofilm thickness. However, shear stress became the dominant factor that resulted in the gradual decrease of biofilm thickness at high expansion ratios ranging from 65% to 90%. In general, biofilm...
A previous study using the batch method showed that sorption behavior of Perchloroethylene (PCE) in low organic content (0.080~0.090 % foc) aquifer sand was nonlinear and fitted the amended dual-mode model (DMM). This study aimed to investigate the transport of PCE in same media using finite duration and continuous input of solute in laboratory column tests. The experiments showed that the transport...
Denitrifying phosphorus removal is a kind of new efficient technology, and can alleviate the contradictions of urban sewage with low-carbon sources. This research took wastewater from a sewage treatment plant in Beijing as study object. Results showed that there was obvious phenomenon of denitrifying phosphorus removal and this phenomenon was gradually strengthened in A2/O process.
The mass balance of COD, N and P in the wastewater treatment process was studied respectively on a trial basis by a pilot-scale A2/O system. Under three kinds of operating conditions which with different temperature (14°C, 18°C, 21°C) and mixed liquor internal recycle ratio (100%, 200%, and 300%), the flow and distribution of COD, N and P in the system were tested and analyzed. The variation of these...
Methyl tert-butyl ether (MTBE) is a common additive for producing a clean burning fuel with a higher Octane number and less emissions. Batch adsorptive capacity, continuous flow breakthrough and biological activated carbon (BAC) treatment experiments were conducted to compare the adsorptive capacities of four activated carbons for MTBE, to obtain the adsorptive capacity indicators useful for predicting...
A bacterial strain Pseudomonas sp. Zjwp-14 was screened out from soil, and used for the biotransformation of DL-2-amino-Δ2-thiazoline-4-carbonic acid to L-cysteine. This strain was identified based on its morphological, physiological characterization, 16S rDNA sequence determination and phylogenetic analysis. The bioconversion process was optimized by examining some key factors including cell cultivation...
A number of activated carbons had been produced from waste tires by pyrolysis and water activation methods, and they had been modified by sulfur steam at high temperature. Produced sulfur-impregnated activated carbons were examined for their mercuric chloride adsorptive ability by thermal gravimetric analysis. The experiment data show that sulfur should be evenly distributed in the activated carbon...
It is known to all that potential global climate change has a great deal to do with anthropogenic emissions of CO2. The carbon dioxide emissions from the exhaust gases of the fossil fuel-fired power plants account for about a third of global CO2 emissions and are increasing in the last decades. At this context, this work presents a survey on the carbon dioxide capture technologies from the power plants...
To evaluate the feasibility of ultrasonic regeneration of granular activated carbon (GAC) used in wastewater treatment, we used ultrasound to regenerate GAC which was used to adsorbed low concentration sewage. The ultrasound with different power, frequency and irradiation time was used to regenerate GAC which treated sewage with the concentration of about 25mg/L. The experimental results indicate...
The nutritional parameters of protease, which is isolated from mao-tofu and identified as Mucor spp, were studied by response surface methodology (RSM). Glucose, soybean protein and KH2PO4 were analyzed by Box-Behnken design for optimizing their concentrations in the medium and the effect of their mutual interaction on protease activity. Glucose and soybean protein were found in influencing the protease...
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