calculation of alum dosage for pace to flow at waste water plant.
calculation of alum dosage for pace to flow at waste water plant.
(OP)
i currently work at a waste water pollution control facility.we do approximately dose anywhere from 1300-3300 m3 of raw waste water per day. currently we use from 300-350 liters of liquid alum per day depending on volume of raw. I am wondering what formula would i use to calculate dosage mg/l. we have no way on doing draw downs. We are investigating on getting pace to flow.specific gravity is 1.33. can anybody help?





RE: calculation of alum dosage for pace to flow at waste water plant.
Al3+ + HnPO43-n ↔ AlPO4 + nH+
This reaction is deceptively simple and must be considered in light of the many competing reactions and their associated equilibrium constants and the effects of alkalinity, pH, trace elements found in wastewater. The dosage rate required is a function of the phosphorous removal required. The efficiency of coagulation falls as the concentration of phosphorous decreases. In practice, an 80-90% removal rate is achieved at coagulant dosage rates between 50 and 200 mg/l. Dosages are generally established on the basis of bench-scale tests and occasionally by full-scale tests, especially if polymers are used. Aluminium coagulants can adversely affect the microbial population in activated sludge, especially protozoa and rotifers, at dosage rates higher than 150 mg/l. Municipal wastewaters may contain from 5 to 20 mg/l of total phosphorous.
Read more: http://www.lenntech.com/phosphorous-removal.htm#ix...
http://www.ceep-phosphates.org/Files/Document/70/p...
http://www.pca.state.mn.us/index.php/view-document...
RE: calculation of alum dosage for pace to flow at waste water plant.
RE: calculation of alum dosage for pace to flow at waste water plant.
WASTEWATER FLOW (MEGALITER/DAY) X DESIRED ALUM DOSE (MG/L)
LITER/DAY ALUM USED (L) = __________________________________________________________
SPECIFY GRAVITY OF ALUM (KG/L) X ALUM CONCENTRATION (%)
1. Liquid alum concentration is a 48.86% solution (check with your supplier)
2. Liquid Alum Specific Gravity @ 60oF 1.33 (check with your supplier)
RE: calculation of alum dosage for pace to flow at waste water plant.
RE: calculation of alum dosage for pace to flow at waste water plant.