Do poly aluminum chloride and poly ferric sulfate affect was digestion?

Poly aluminum chloride (PAC) and poly ferric sulfate (PFS) are widely used in wastewater treatment and sludge dewatering, resulting in their amounts being accumulated substantially in waste activated sludge (WAS). Till now, however, little information about their influence on WAS digestion is available.

Does PAC improve dewaterability of digested sludge?

PAC improved dewaterability of digested sludge more obviously. Poly aluminum chloride (PAC) and poly ferric sulfate (PFS) are widely used in wastewater treatment and sludge dewatering, resulting in their amounts being accumulated substantially in waste activated sludge (WAS).

How is PAFC synthesized?

PAFC was synthesized following two steps: First, 50 g of blast furnace dust was placed in a 500 mL three-necked round bottom flask equipped with stirrer and reflux device. Then, 2 g NaF, 150 mL of HCl diluted solution (36%, freshly diluted 1:1 with ultrapure water) and 5 mL of HNO 3 were added.

How to extract (Al + Fe) B species from PAFC?

The mixture solution of ethanol, propylene glycol, and acetone could be used as precipitation solvents to extract the (Al + Fe) b species from PAFC. The optimal separation and purification conditions were organic solvents volume ratio = 2:1:7 and the middle organic solvents dosage V2 = 100 mL ( V1 = V3 = 50 mL, for 10 mL of 0.3 M PAFC solution).

What is the difference between Pac and PAFC?

The Infrared spectrum of PAFC, extracted (Al + Fe) b species and commercial PAC showed higher content of aluminum and iron polymer linked by hydroxyl bridge in the extracted (Al + Fe) b samples compared to PAC and PAFC. The micro-morphology of the extracted (Al + Fe) b species has a three-dimensional network structure with rough branching surfaces.

Does PAC reduce sulphide production during sludge anaerobic process?

Particularly, PAC with ability to depress sulphide production during sludge anaerobic process and enhance the dewaterability of digested sludge compared with control and PFS sludge.