Abstract
Enteromorpha prolifera polysaccharide (EP) was extracted under different preparation conditions and then used in conjunction with polyaluminum chloride (PAC) or ferric chloride (FeCl3) for surface water treatment. The coagulation behavior of PAC-EP was investigated under different coagulant dosages, reaction temperatures and solution pH values. Statistical analysis was conducted to explore the main factors affecting the coagulation performance of PAC-EP. In addition, the floc structure was characterized to determine the underlying flocculation mechanism of EP in the water treatment process. The results showed that EP was a water-soluble sulfated polysaccharide with a maximum extraction rate of 15%. Compared with FeCl3, PAC exhibited a better cooperation effect with EP, and the coagulation efficiency could be enhanced by 20%−40% under a moderate dosage of EP 30 s after PAC addition. Moreover, the coagulation performance of the PAC-EP treatment was maintained at a high level over relatively wide pH (6.0–9.0) and temperature ranges (5–20 ℃). The statistical results indicated that the EP dosage was the main factor affecting the removal of organic substances. For water obtained from the Kui River, the optimal PAC-EP dosage was 1–4 mg/L, which adequately removed protein-like and humic acid-like organic substances. The aid mechanism of EP was attributed to the bridging effect of its long-chain molecular structure, which could connect PAC hydrolysates and colloidal particles effectively to form complex compounds, thus facilitating the formation of large flocs.
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