Can chitosan & polyaluminum chloride be used to flocculate pig biogas SL?

In this study, to fully utilize the advantages of the two flocculants and achieve efficient removal rates of nitrogen and phosphorus from a biogas slurry, chitosan (CTS) and polyaluminum chloride (PAC) were used as a composite flocculation agent to flocculate pig biogas slurries.

Is chitosan a useful coagulant & flocculant?

This amino-biopolymer has also received a great deal of attention in the last decades in water treatment processes for the removal of particulate and dissolved contaminants. In particular, the development of chitosan-based materials as useful coagulants and flocculants is an expanding field in the area of water and wastewater treatment.

Which chitosan flocculant is best?

The ratio of performance to price of composite chitosan flocculant of 1.8 mg/L CTS plus 320 mg/L PAC is the highest one which is 1.755 times as that of pure PAC. So the composite chitosan flocculant of 1.8 mg/L CTS plus 320 mg/L PAC is the best one among all the 10 flocculants. Fig. 3.

How much does chitosan flocculant cost in China?

Cost of this composite chitosan flocculant reduced 7–34% (or cut 7–34% down), compared with that of pure PAC. Nowadays the dosage of pure PAC used for city’s sewage and feedwater treatment is about 50,000 tons in China every year. The price of PAC’s is about 241 US dollars per tonne.

Does chitosan flocculant remove Cod SS & Al 3+?

Compared with the conventional flocculant such as PAC, the percentage of removing COD, SS and Al 3+ in the treated water using this novel composite chitosan flocculant were enhanced by 1.8–23.7%, 50% and 61.2–85.5%, respectively, and its cost was cut down 7–34%.

What are the advantages and disadvantages of chitosan flocculants?

Compared with traditional chemical flocculants, chitosan has the following advantages: the required dosage is less, a quicker depositing velocity, a higher efficiency of removing COD, SS and metal ions, easier sludge treatment, and there is no further pollution.