Table of Contents
What is the standard value of BOD?
For drinking water BOD has to be less than 5 mg/L and for treated wastewater to be disposed of in the water bodies it is 30 mg/L, 100 mg/L if treated waste water is discharged into the sewerage system in India.
What is the value of BOD of industrial sewage?
What is the value of BOD of industrial sewage in kg/day, given population equivalent as 6000 persons? Explanation: BOD of industrial sewage in kg/day = Population equivalent * Average standard BOD of domestic sewage = 6000*0.08 = 480kg/day.
What is the Indian standard for BOD in drinking water?
| Characteristics | Designated best use | |
|---|---|---|
| Dissolved Oxygen (DO)mg/l, min | 6 | 4 |
| Biochemical Oxygen demand (BOD)mg/l, max | 2 | 3 |
| Total coliform organisms MPN/100ml, max | 50 | 5,000 |
| pH value | 6.5-8.5 | 6.0-9.0 |
What is the value of BOD of good quality water?
BOD values range widely; generally, pristine waters have a value below 1 mg l−1, moderately polluted waters 2–8 mg l−1, and treated municipal sewage 20 mg l−1. Standards for the discharge of effluent from WWTPs have the range 20–30 mg l−1 and require a minimum flow in receiving waters to ensure sufficient dilution.
How is BOD value calculated?
Dissolved oxygen (D.O.) is measured by probe before and after incubation. BOD is computed based on the difference between initial and final D.O. The test uses dilution water and a known amount of sample in a 250-300 ml incubation bottle.
Is 10500 2012 is the standard for?
Precautions/Care should be taken to prevent contamination of drinking water from chlorine resistant parasites such as cryptosporidium species and giardia. This standard prescribes the requirements and the methods of sampling and test for drinking water.
Is standards for river water quality?
The permissible Iron concentration in surface water is less than 1.0 mg/litre as per the BIS Standard for drinking water. Dissolved Oxygen below 5.0 mg/l is observed at 17 water quality stations in 9 states. · BIS has recommended 3.0 mg/l concentration of Biochemical Oxygen Demand (BOD) for outdoor bathing.
How is BOD level calculated?
The BOD level is determined by comparing the dissolved oxygen levels of a water sample before and after 5 days of incubation in the dark (see the next section for this).
What is the value of BOD and COD?
Hence, the value of COD is greater than BOD….Chemical Oxygen Demand (COD) v/s Biological Oxygen Demand (BOD)
| BOD | COD |
|---|---|
| BOD value is determined by 5 days. | COD can be measured within few days. |
| BOD value is lower than COD | COD value is always greater than BOD |
How is effluent BOD calculated?
BOD (or COD) load: Units: kg/day The concentration of BOD (in mg/l) in the influent can be used to calculate the total BOD load per day being treated. This is simply done by multiplying the BOD in mg/l by the daily effluent volume in cubic metres (m3) and dividing the product by 1000.
How do you make a BOD standard solution?
Add 150 mg glucose and 150 mg glutamic acid to distilled water and dilute to 1 L. Prepare fresh immediately before use unless solution is maintained in a sterile condition. Store all glucose-glutamic acid mixtures at 4°C or lower. Commercial preparations may be used but concentrations may vary.
What is the maximum BOD value for effluent disposal?
Typical maximum values range from 10 mg/L for direct environmental disposal and 300 mg/L for disposal to sewer systems. Knowing BOD value helps municipal authorities determine their biological water quality and industries to assess the impact effluent disposal will have on the immediate environment.
What is BOD value and why is it important?
Knowing BOD value helps municipal authorities determine their biological water quality and industries to assess the impact effluent disposal will have on the immediate environment. Wastewater treatment plants use BOD value as an index to ascertain the overall degree of organic pollution in a water source.
What is the BOD test for water pollution?
A BOD test is typically carried out over a standard 5-day incubation period at 20°C (68°F) for the most accurate results. Generally, a higher BOD value indicates a higher level of water pollution, while a lower BOD value indicates less polluted, or cleaner water. Benefits of BOD Removal Wastewater Treatment
What is the maximum acceptable level of BOD in the environment?
BOD is listed as a conventional pollutant under the U.S. Clean Water Act. Typical maximum values range from 10 mg/L for direct environmental disposal and 300 mg/L for disposal to sewer systems.