What is the difference between COD and BOD? – Butler Manufacturing Services
What is the difference between BOD, COD or TOC? Why do I have to however, a ratio usually can be correlated between the two tests. This requires COD. It is essential to obtain a correlation between BOD5 and COD for various was to investigate the relation between biochemical oxygen demand (BOD) and. The main focus of wastewater treatment plants is to reduce the BOD in the effluent Chemical oxygen demand (COD) does not differentiate between biologically . Turbidity units are supposed to correspond to TSS concentrations, but this correlation is that the difference in turbidity not exceed 25 NTU downstream from a.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article has been cited by other articles in PMC. Abstract BOD Biochemical oxygen demand is the pollution index of any water sample.
One of the main factors influencing the estimation of BOD is the nature of microorganisms used as seeding material.
Difference Between BOD and COD | Definition, Test Method and Procedure, Purpose
In order to meet the variation in wastewater characteristics, one has to be specific in choosing the biological component that is the seeding material. Bacterial strains were isolated from 5 different sources and were screened by the conventional BOD method. The selected microbial seed comprises of Enterobacter sp.
COD Chemical oxygen demand ratio using the formulated seed comes in the range of 0.
After 90 days, it has been observed that the ratio of BOD: COD increased in case of selected consortium 7 up to 0. Introduction Dairy industry is found all over the world, but their manufacturing process varies tremendously [ 1 ].
This sector generates huge volume of wastewater and its pollution is primarily organic [ 23 ]. It generates about 0. In general, liquid waste in dairy industry presents the following characteristics high organic content, high oils and fats content, high level of nitrogen and phosphorous, dissolved sugar, nutrients, and so forth [ 5 ]. Due to the presence of high organic load, dairy effluents degrade rapidly and deplete the DO dissolve oxygen level of the receiving streams and become the propagation place for mosquitoes and flies carrying malaria and other perilous disease like dengue fever, yellow fever, and chicken guinea [ 67 ].
Nutrients present in dairy effluent like nitrogen and so forth lead to eutrophication of receiving waters, and detergents affect the aquatic life [ 38 ]. Presence of nitrogen in dairy effluent is another major problem that once converted may contaminate ground water with nitrate [ 9 ]. COD is a chemical oxidation process. The common test method for BOD is method B.
The common method for COD is method BOD is determined by incubating a sealed water under specific temperature sample for five days and measuring the loss of oxygen from the beginning of the test. COD is determined by incubating a closed water sample with a strong oxidant like potassium dichromate K2Cr2O7 in combination with boiling sulfuric acid H2SO4 under specific temperature for a specified period of time. Five days are taken for the determination of the BOD.
COD measurement can be taken from few days. The permissible limit of COD is to ppm.
Values of Measurement BOD: Therefore, the more organic material can be oxidized by COD. Biological oxidation is capable of oxidizing natural organic detritus and organic waste in the water. Enzymes are the most widely used biological sensing elements in the fabrication of biosensors.
What is the difference between COD and BOD?
Their application in biosensor construction is limited by the tedious, time consuming and costly enzyme purification methods. Microorganisms provide an ideal alternative to these bottlenecks.
Moreover, the use of microbes in biosensor field has opened up new possibilities and advantages such as ease of handling, preparation and low cost of device. A number of pure cultures, e. Trichosporon cutaneum, Bacillus cereus, Klebsiella oxytoca, Pseudomonas sp. On the other hand, many workers have immobilized activated sludge, or a mixture of two or three bacterial species and on various membranes for the construction of BOD biosensor.
The most commonly used membranes were polyvinyl alcohol, porous hydrophilic membranes etc. Such a formulated consortium can be immobilized on suitable membrane, i.4.4 Water Pollution - Eutrophication (DO and BOD)
Suitability of charges nylon membrane lies in the specific binding between negatively charged bacterial cell and positively charged nylon membrane. So the advantages of the nylon membrane over the other membranes are: The dual binding, i.