Influence of source characteristics, chemicals, and flocculation on chemically enhanced primary treatment.
The overall objective of this research was to investigate various methods and parameters to increase the efficiency of chemically enhanced primary treatment (CEPT). The performance of CEPT was evaluated based on its efficiency of removal of nonsettleable solids (NSS). Some of the source characteristics that influenced NSS concentration included influent total suspended solids, influent turbidity, and influent total chemical oxygen demand. A higher concentration of the influent constituents led to a higher NSS concentration, suggesting that NSS represented a somewhat fixed fraction or percent of these influent constituents. The specific particle surface area (SPSA) was found to correlate with percent NSS in the effluent. A higher SPSA is a result of smaller-sized nonsettleable colloidal particles, thus leading to an increase in percent NSS. In summary, there are several parameters that affect NSS, which could be used to control NSS to improve CEPT, as demonstrated by this study.
Metcalf and Eddy, Laurel, Maryland, USA.
Dilli R
DR
Neupane
Rumana
R
Riffat
Sudhir N
SN
Murthy
Marija R
MR
Peric
Thomas E
TE
Wilson
D002712:Chlorides; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D005427:Flocculation; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D002712:Chlorides; D005290:Ferric Compounds; D005296:Ferrous Compounds; D012722:Sewage; C029451:ferrous chloride; C024555:ferric chloride