A new approach for monitoring water quality is proposed based on quantitative remote sensing in Huangpu River, Shanghai. The data processing for multi-spectral remote sensing imagery is first presented. The inversion ...
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A new approach for monitoring water quality is proposed based on quantitative remote sensing in Huangpu River, Shanghai. The data processing for multi-spectral remote sensing imagery is first presented. The inversion models for two typical water quality parameters - Dissolved oxygen (DO) and Secchi disk (SD) are then developed. Based on the derived models and multi-temporal remote sensing imagery, the spatial- temporal analysis for the water quality variation is therefore conducted. The results show that the proposed models can detect effectively the temporal and spatial distribution of water quality.
In the study, we focus on the water quality monitoring and mapping using remote sensing .The objective of the research is to develop a precise and fast way of monitoring water chemical and biochemical quality of the w...
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In the study, we focus on the water quality monitoring and mapping using remote sensing .The objective of the research is to develop a precise and fast way of monitoring water chemical and biochemical quality of the water resources reservation area in the upper region of Huangpu River in Shanghai, China. One scene Thematic Mapper (TM) image in summer of 2005 was acquired and the simultaneous in situ measurement, sampling and analysis were performed. The main methods include radiometric calibration of TM remote sensor, atmospheric correction to image data and statistical model construction. The results indicate that satellite-based estimates and in situ measured water reflectance have high correlation, and a statistical relationship between calibrated image data (average of 5 times 5 pixels) of TM bands and laboratory analyzed data of water samples indicated that the reflectance of TM band 1 to band 4 and organic pollution measurements such as BOD and COD had higher correlation.
Presented is a study of molecular weight distribution of organic matter and the removal of organic matter by using coated filter media and activated carbon in combination. Study shows that coated filter media can effe...
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Presented is a study of molecular weight distribution of organic matter and the removal of organic matter by using coated filter media and activated carbon in combination. Study shows that coated filter media can effectively remove organic matter. The organic matter UV254 reduces from 0.1 cm-1 to 0.05 cm-1 and the removing percentage reaches 45% when the coated filter media is used. For the organic matter with a molecular weight greater than 1 k, the removing percentage even exceeds 70%. However, activated carbon has an eminent effect on removing the organic matter with small molecular weight. Test results show that activated carbon and coated filter media are complementary for removing organic matter. The removal is more effective when activated carbon is used along with coated filter media, since the amount of organic matter in the water removed by the coaction of activated carbon and coated filter media increases by 50%. It must be emphasized in engineering practice that the treatment process for removing organic matter needs to be properly devised in advance according to the real quality of water resources, especially the molecular weight distribution of organic matter in the water.
Through the batch anaerobic fermentation test of rotten organic waste, the influences of pH value of fermentation liquor on hydrolysis and acidogenesis rate were compared. The pH value 5-7 of the fermentation liquor w...
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Through the batch anaerobic fermentation test of rotten organic waste, the influences of pH value of fermentation liquor on hydrolysis and acidogenesis rate were compared. The pH value 5-7 of the fermentation liquor was favorable for the hydrolysis of paniculate organism. Under the conditions of uncontrolled pH values of 5, 6, 7 and 8, when the microorganisms grew at stationary phase, the hydrolysis rate constants K were 6.81 × 10-5, 6.57 × 10-4, 3.51 × 10-4, 7.55 × 10-4, 2.47 × 10-4 h-1, respectively. The pH = 7 of the liquor was most preferable for the microbial synthetic metabolism and further promoting hydrolysis and acidogenesis processes of carbohydrate and protein, displaying the production of large amount of metabolites such as ethanol, acetic acid, butyric acid and ammonia nitrogen, as increase of other kinds metabolite. pH = 5 and pH = 6 promote acidogenesis process at the later stage of the reaction;pH = 8 could inhibit the acidogenesis process;and uncontrolled pH value could inhibit seriously the processes of hydrolysis and acidogenesis.
Effect of pH, HA and anions HCO3-, NO3-, CO32-, Cl- and SO42- in aqueous solution on the photodegradation of 17α-ethynylestradiol(EE2)was studied by using a batch photo-reactor. The results show that 17α-ethynyestra...
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Effect of pH, HA and anions HCO3-, NO3-, CO32-, Cl- and SO42- in aqueous solution on the photodegradation of 17α-ethynylestradiol(EE2)was studied by using a batch photo-reactor. The results show that 17α-ethynyestradiol(EE2) could be removed effectively by the UV/H2O2 process. The rate of photodegradation in aqueous solution follows first-order kinetics. When H2O2 was dosed as 5 mg/L, irradiated by a 14W low pressure mercury vapor discharge lamp, the first-order photodegradation rate constant of EE2 in distilled water and tap water were 0.0630 min-1 and 0. 1324 min-1 respectively. HA, HCO3-, NO3-, Cl- and SO42- have inhibitory action on EE2 photodegradation. when their concentrations at 5 mmol/L, their inhibitory action: HCO3- > SO42- > Cl- > NO3-. HCO3- induced photodegradation rate constant of EE2 reduced by half, It was anions synthesize effect that caused photodegradation rate constant of EE2 in tap water lower than distilled water.
By measuring the respiratory oxygen consumption, a study on the aerobic biodegradability of 2-fluorophenol, 3-fluorophenol and 4-fluorophenol was conducted using activated sludge acclimated by themselves respectively....
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By measuring the respiratory oxygen consumption, a study on the aerobic biodegradability of 2-fluorophenol, 3-fluorophenol and 4-fluorophenol was conducted using activated sludge acclimated by themselves respectively. The experimental results showed that bio-oxidation ratios of 2-fluorophenol, 3- fluorophenol and 4- fluorophenol were 25.30%, 35.28% and 36. 60% respectively, and the oxygen consuming rate constants were 0.009 3, 0.0133 and 0.0145 L/gSS· h respectively. The aerobic biodegradability of the mono-fluorophenols decreased in the order of 4- fluorophenol＞3 - fluorophenol ＞2 - fluorophenol, resulting mainly from the different octanol/water partition coefficient and the different steric parameter of the fluorophenols which can affect the penetration of fluorophenol into cell membrane.
The thesis carried out a research on the removal effects of organics, bacterial, turbidity, THMFP with different coagulants using jar-testing. The result shows: Aluminum-Ferric Chloride Sulfate (AFCS) can remove the o...
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The thesis carried out a research on the removal effects of organics, bacterial, turbidity, THMFP with different coagulants using jar-testing. The result shows: Aluminum-Ferric Chloride Sulfate (AFCS) can remove the organics THMFP effectively. The coagulation process helps remove bacteria through two ways: the floes packing and direct killing. To decrease the quantity of bacteria to a proper degree can do favor to the disinfection process, and can be a part of optimization of disinfection.
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