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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.
A new type of effective coagulant Microbial Flocculants was prepared from A- spergillus oryzae and used as coagulant in the treatment of papermaking wastewater. The experimental results showed that it had a good coagulation effect in the treatment of papermaking wastewater in a wide range of pH value. The removal rate of SS and CODCr was 97% , 81 % respectively in the condition where temperature was...
Leachate from gangue is known as the main pollutants source to mining area soil and groundwater pollution. Long term leaching experiment are carried out to seek the long term effect on leachate chemistry of gangue under long term exposure to rainfall and atmosphere. Gangue from Xishan coal mine is used for long term dynamic leachate to analyze and compare the changes of the various metal ions in leachate...
A preliminary study using gamma radiation on coking wastewater samples was carried out. Chemical oxygen demand (COD), biochemical oxygen demand (BOD) and Ammonia-nitrogen content results were obtained at different doses (1.0, 3.0, 5.0 and 7.0 kGy). As increase of the absorbed doses, a decrease of COD and BOD was observed after irradiation, whereas at the doses of 5 kGy and 7 kGy, the residual concentrations...
Two different leachates of Chang'an landfill in Chendu were collected as the object of study. The components of organic pollutants in leachates were detected by combined GC-MS technique based on the general water quality analysis. Test results of study are as the follows: the type and nature of organic pollutant effect directly on leachate biodegradability. In high biodegradability (BOD5/CODCr = 0...
The fly ash is the vice- outcome of the coal combustion, it results pollution of the environment. The possibility of the fly ash removing color in water was studied in this text. Through experiment text of removal color in methylic orange waste water by front and back character modified of the fly ash, the mechanism was discussed. The influent density of dosing quantity, respond time, respond temperature,...
By changing phosphorous removal tank of Biolak process into hydrolytic acidification tank. The super efficiency shallow air flotation and improved Biolak process is adopted to treat the waste water of paper making factory. Meanwhile, the article introduces the apiece structon, the performance parameter and the economy technology index. The operating results show that the effluent reaches the "Standards...
Sample preparation is essential for isolating desired components from complex matrices and greatly influences their reliable and accurate analysis. Stir-bar-sorptive extraction (SBSE) is a new and effective sample preparation technique.A rapid method for analysis of Ultra-trace nonylphenol in the aquatic environment was developed by stir bar sorptive extraction. The extraction recoveries of nonylphenol...
The pulp & paper industry generates a considerable amount of wastewater in its manufacturing processes. Currently, the pulp and paper industry is facing more stringent standards for discharges of wastewater and associated permits. Biological processes such as activated sludge and aerated lagoons are conventionally used to treat pulp mill effluents. However, these processes have limited ability...
Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
Iron-carbon microelectrolysis was used to pre-treat straw pulp and papermaking middle stage wastewater. Effect of iron dosage, iron/carbon ratio, initial pH, aeration and aeration pattern on the pollutant removal efficiency was investigated and the biodegradability of wastewater before and after treatment were compared. The results showed that the iron dosage affected pollutant removal slightly in...
In this study, we have investigated the effect of pollutants removal of a vertical multilevel soil infiltration (VMSI) system on municipal wastewater treatment. The VMSI was of 30cm*20cm*50cm column, in which combined stuffing consisted of soil, quartz sand, active carbon and scrap irons were packed. As a result, VMSI system exhibited excellent removal efficiency with 91.7% of COD, 98.4% of NH4+--N,...
In this paper, the degradation of 2,4,6-trichlorophenol (TCP) by hydrogen peroxide catalyzed by nano-iron was studied. Nano-iron was obtained through chemical reduction of FeSO4·7H2O and KBH4. The influences of pH, the concentration of H2O2, temperature, ionic strength and the amount of nano-iron on the degradation of TCP were investigated. The result showed that under the optimized condition, more...
In order to study the effect of fillers with adsorption and drying on rubbish degradation, leachate production and water quality of leachate, five cylinder reactors for landfill disposal were built to simulate the operation of landfill, one reactor was used as contrast reactor, no filler added in it. Saw powder, activated carbon, zleolite and newspaper were added into another four reactors. In the...
The effect of solution temperature and the determination of the kinetic parameters of methylene blue (MB) adsorption onto cereal chaff were performed to understand the adsorption mechanism. The pseudo-second order kinetic model was fitted to the experimental data and found it was good to predict the adsorption behavior using nonlinear regressive method, suggesting that the mechanism may be a chemisorption...
Polymer Si-Fe (PSF) coagulant was prepared by co-polymerization. The oxidization of PSF was investigated by using jar test for humic acid (HA) solution sample and measuring oxidization-reduction potential (ORP) compared with that of polyferric aluminum (PFA). The results show that PSF has higher ORP value than PFA, with the difference of 420mV. PSF is an oxidization coagulant that possibly changes...
The concentration of eighteen nutrients and heavy metals in E. crassipes collected from different sites in the North Zhejiang, China was concurrently studied. The concentration of the elements in whole plants was in the order of K (14896.92 μg g-1)>P (5775.78 μg g-1)>S (5596.38 μg g-1)>Ca (2368.92μg g-1)>Pb (2380.03 μg g-1)>Mn (852.90 μg g-1)>Fe (782.63 μg g-1) >Al (456.26 μg...
A new kind of Cd2+-adsorption material was prepared using maifan stone by composite modification with chemical and heat treatment methods. The modified maifan stones were characterized by SEM and EDS. Effects of the modified maifan stone content, contact time and the initial pH of the solution on the adsorption of Cd2+ were studied. The research results show as follows: 1) The composite modified maifan...
Washing coal usually brings about 0.2m3/t wastewater (in terms of closed circulation) due to transpiration, which provides an effective space for the recycle of coke-plant wastewater. The effluent from phenol-cyanogen wastewater biochemical disposal station is used as complementary water for washing coal, and Closed-Cycling System in coal preparation plant is introduced to make industrial experiment...
Biosorption of organic pollutants, expressed as COD, by aerobic and anaerobic sludge was conducted to examine equilibrium and kinetic models. Freundlich and Langmuir models were mostly used for mathematical description of the biosorption equilibrium. Freundlich equation was more fit to describe the equilibrium of biosorption process in this study. Under the same experimental condition, biosorptive...
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