Improvement of coagulation–flocculation process using anionic polyacrylamide as coagulant aid

Using Chemically Enhanced Primary Treatment (CEPT) as a Pretreatment Option for Anaerobic Digestate from Cattle Manure Digestion System

“…The combined uses of anionic polyacrylamide (APAM) with coagulants in wastewater treatment have been reported as resulting in a number of benefits, for example: improving efficiency in removing pollutants while saving coagulants; and producing less sludge volumes with good dewaterability [31][32][33]. In Figure 3, it was shown that the addition of APAM can increase COD removal efficiencies for CEPT, while no obvious effects were noted for TP removal.…”

“…The combination of coagulants with anionic polymers as a coagulant aid for CEPT of wastewater also exhibited better removal efficiencies for pollutants [31,32]. The combined uses of anionic polyacrylamide (APAM) with coagulants in wastewater treatment have been reported as resulting in a number of benefits, for example: improving efficiency in removing pollutants while saving coagulants; and producing less sludge volumes with good dewaterability [31][32][33].…”

Treatment of automotive wastewater by coagulation-flocculation using poly-aluminum chloride (PAC), ferric chloride (FeCl3) and aluminum sulfate (alum)

“…FIGURE 7 demonstrates that the nickel removal trend by three coagulants were similar to that of zinc. PAC produced 63% of zinc removal under the optimum dose of polymer, while alum remained the lowest at 24%, under optimum condition of 4 mg/L polyacrylamide dose.Generally, a little amount of polyelectrolyte dosage isenough to reach high efficiency because it hassome advantages including the possibility of structurationin response to specific requirements, greater purity, higherquality, stability and greater efficiency [21]. Withpolyacrylamide as acoagulant aid, the metal coagulantdosage can be reduced without cutting down the performance.…”

Flocculation-ultrasonic assisted extraction and solid phase clean-up for determination of polycyclic aromatic hydrocarbons in water rich in colloidal particulate with high performance liquid chromatography and ultraviolet-fluorescence detection

“…According to the literatures reported, with this process, 80% of organic compounds and at least 85% of suspended solid could be removed from water [19]. And additions of some adsorbents or flocculant aids such as activated carbon [20], organobenite [21], metal oxides [22] to the system may considerably promote the removal further due to the synergetic effect of the accelerated kinetics of coagulation-flocculation, sedimentation, and particularly of adsorption.…”