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 Posted: Wed 10:05, 15 Dec 2010 Post subject: Determination of BOD on the issue _2843 |
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Determination of BOD on the issue
Fine aggregate characteristics of the audio is great by making the best of the ratio of fine aggregate, can reduce the spread of in-house sound speed, increasing the acoustic attenuation. This increases the effect of pavement thickness is consistent. Journal of the \Substances dissolved oxygen consumption by the aerobic decomposition of organic matter, nitrification of ammonia by the nitrifying bacteria,ugg stivali, nitrite nitrogen, nitrite ions, sulfide, ferrous iron and other inorganic reduction. Aerobic micro-organisms break down usually about 90 of the biodegradable organic matter is required in 20V 12 ~ 14 days, and then start from the nitrification of ammonia nitrogen, nitrite nitrogen for nitrification. In the United States and Europe, into the rivers reach the sea, the time required for organic matter is 5 days. In order to show that here because of natural purification in the number of consumed oxygen, BOD 5, proposed indicators. BOD is the determination of dissolved oxygen concentration measurement,ugg italia, the analysis is not difficult. Training period, but the reaction caused by biological reaction. Slightly different culture conditions, differences in measured value to large. Therefore, methods of taking specimens, preservation methods, pretreatment, dilution water adjustment method,ugg italia, temperature conditions,UGG milano, and so detailed provisions inhibiting nitrification. When samples containing more than consumption of substances dissolved oxygen in water saturation, the oxygen should be diluted before culture. Special factory in the determination of sewage, effluent BOD sterile, due to lack of microbial biomass, microbial inoculation so often to go in the water, BOD, water samples are being tested at 2O ℃ temperature, oxygen consumption is 5 days representative. This incubation time is 5 Determination of the target organisms, but the determination of nitrifying bacteria in the majority of the sample above, the culture time of 5 with the decomposition of organic matter produced with nitrification. As a result, in the decomposition of organic matter needed oxygen (c-BOD) were added on the oxygen needed for nitrification (N-BOD), often measured from the (T-BOD), in particular the treatment of domestic sewage and fecal nitrogen contained in sewage sludge, it is easy for this phenomenon. Typically, the inflow of sewage treatment plant less the impact of nitrifying bacteria, nitrifying bacteria in activated sludge when the reproduction, the processing in the water there are lots of nitrifying bacteria, N ~-BOD showed unusually high BOD values. In this case, the right to determine the extent of sewage treatment in the organic difficulty, therefore, requires the determination of inhibition of N-BOD after the C-BOD. BOD birthplace in other major UK and Europe in 19 countries, 14 countries have adopted 20L: 5 日 BOD,ugg italia, Sweden, Finland by 7 BOD. COD determination was determined by oxidizing organic matter. Determination of BOD determination with the principle of different organic compounds measured are also different. In Japan, COD determination method is the use of acidic potassium permanganate water quality on public waters were measured, and the US-led many countries are described by two potassium chromate method. For urban sewage, if the BOD and CODM ~ acid method for comparison, the correlation coefficient is quite high. Determination of water quality but also achieve the same results were obtained raw sewage, sedimentation sewage, activated sludge treatment of water when the correlation coefficient is often varied. The main reason is the impact of nitrifying bacteria. As treated water COI) M acid method of biological treatment has been terminated, and the residual organic matter is largely stabilized. Therefore, its value is also more stable. However, T-∞ D is c-BOD and N-) D with the calculated, and because the N-BOD treated water contained by the number of nitrifying bacteria dominated, so cOD acid method and T-BOD is almost irrelevant. Determination of organic methods can also use the instrument. For example, the sample combustion, reduced from the amount of oxygen in the carbonate content in the control sample; from the COz produced by the combustion of carbonic acid in the amount of test sample. TOC (total organic carbon) carbonated containing heavy storm and planktonic material, prone to error. In addition, the TOD (Total Oxygen Demand) is the organic material is oxidized to CO, NO, SO gas as a precondition, it is in the water containing NO, NOa, SO, dissolved oxygen, will produce a negative error. BOD and TOD in the river very high correlation coefficient, while doing the activity of nitrification of the sludge in the water, lmg / 1 of NOz-N, NOs-N, respectively release 1.71,0. ST. ~ / L of oxygen, so in the TOD should be determined with this sample to be attention. Existing sewage treatment plant is based on the treatment of organic substances for the purpose of processing functions to determine the measured indicators of c-BOD organic matter is essential. Journal \
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