SUMMARY OF KEY WASTEWATER MATH FORMULAS General: Mass, Lbs/Day = (Vol, MGD) x (Conc., mg/l) x (8.34 lbs/gal) (BOD)/(SS), Lbs/Day
How does a wastewater treatment plant work?
Dec 17, 2016 · If you don't have BOD data, you can use your COD data and a COD/BOD ratio of 2.1 as a starting point. Use the 2.1 ratio value with caution though as it is highly variable from one wastewater system to another. The equation below assumes you also don't have MLVSS data so you can use your MLSS data estimating that the MLVSS is 72% of the MLSS.
What are the different stages in the treatment of wastewater?
SUMMARY OF KEY WASTEWATER MATH FORMULAS - Continued Ponds and Lagoons: 5. Hydraulic Loading = ( Pond Depth, Inches ) Rate, Inches/day ( Detention Time, Days ) 6. Pond Depth, Ft. = ( Daily Flow Into The Pond, Cu.ft. ( Total Surface Area of the Pond, Sq.ft. ) 7. Volume, = ( Area, acres ) x ( Depth, ft. ) Acre-Ft 8.
What are the basics of wastewater?
Jan 13, 2011 · Water Treatment Math Formulas Water Treatment Formulas 5 Dosage (Flow, MGD) (8.34 lbs/gal) Chemical Feed Rate, lb/day Dosage, mg/L (Flow, MGD) (8.34 lbs/gal) (Chemical Feed Rate, lbs/day) (Chemical Purity, %, expressed as a decimal) Dosage, mg/L (Flow, gal/min) (3.785 L/gal) (Feed Rate, grams/min) (1,000 mg/gram) Dosage, mg/L Pounds
What are the assumptions of wastewater treatment?
treatment to remove nutrients and other contami-nants. Secondary Treatment The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it. The principal secondary treatment techniques used in secondary treatment are the trickling filter and the activated sludge process.
What is formula A in wastewater treatment?
How is water treatment calculated?
- CHLORINATION. Dosage, mg/l = (Demand, mg/l) + (Residual, mg/l)
- HTH Solid (lbs) = (Vol, MG) x (Dosage, mg/l) x (8.34lbs/gal)
- Liquid (gal) = (Vol, MG) x (Dosage, mg/l) x (8.34 lbs/gal)
How do you calculate wastewater?
How do you calculate wastewater volume?
- Formula:
- L x W x D. = Cubic Feet.
- Cubic ft x 7.47. = Gallons.
What is the formula for calculating medication?
How do you calculate ppm?
How is wastewater treatment plant capacity calculated?
- Total domestic (raw) water demand = TWD.
- Estimated Sewage X = 90 % of TWD.
- Estimate Sewerage X = 90/100 * TWD For Eg If TWD = 1500 KLD.
- Capacity of S.T.P = 90 / 100 * 1500 KLD = 1350 KLD.
What is flow rate in wastewater treatment?
How do you calculate sludge in wastewater treatment?
How is wastewater loading calculated?
How do you calculate litres of water in a tank?
How is BOD load calculated?
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.
Temperature Conversion
To convert from degrees F to degrees C or vice versa you can use the following equations.
Mean Cell Residence Time (MCRT)
The MCRT is also referred to as sludge age or solids retention time (SRT). This is the "complete" or full version of the MCRT equation that includes the mass of solids in the secondary clarifiers.
Food-to-Mass (F:M) Ratio
If you don't have BOD data, you can use your COD data and a COD/BOD ratio of 2.1 as a starting point. Use the 2.1 ratio value with caution though as it is highly variable from one wastewater system to another. The equation below assumes you also don't have MLVSS data so you can use your MLSS data estimating that the MLVSS is 72% of the MLSS.
Sludge Volume Index (SVI)
The typical sludge volume index (SVI) range for a well-operated activated sludge wastewater system is between 50 and 150 mL/g. The graph (and tabulated data) below compares the SVI at a refinery over a period of approximately three months.
Surface Area and Circumference
As an example, let's calculate the volume of a clarifier with a 100-ft diameter and a 14-ft sidewall depth (SWD).
Percent of Inactivation
This formula is commonly used in water treatment. Water systems must achieve at least 99.9 percent (3-log) removal or inactivation of G. lamblia cysts and 99.99 percent (4-log) removal or inactivation of viruses.
Two Common Wastewater Factors
We frequently use 8.34 lb/gal and 62.4 lb/cubic foot. Here's how those two numbers look with their units fully revealed.
head loss
As it percolates through a granular filter bed, water loses energy, i.e. pressure, through friction which is designated head loss. At low velocities (laminar flow conditions), this head loss is governed by Darcy’s equation:
influence of fouling
The above formulas apply to a clean and homogenous medium (R constant throughout the depth).
minimum fluidization rate
In upflow conditions, we can write that the minimum fluidisation rate (V mf) (see fluidisation) is reached when the head loss is equal to the apparent weight of the bed per unit of surface area (real weight less the Archimedes thrust) :
