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| Preparation of Polymeric Ferric Sulfate from Paper Mill Sludge and Its Flocculation Properties |
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| DOI：10.11981/j.issn.1000-6842.2014.03.20 |
| Key Words:pulp mill sludge; polymeric ferric sulfate; sodium chlorate; flocculation |
| Fund Project:浙江省重大科技专项(2009C030063)。 |
| Author Name | Affiliation | | 杨建邦 | 温州大学生命与环境科学学院，浙江温州，325000 | | 张福亿 | 温州大学生命与环境科学学院，浙江温州，325000 | | 肖继波* | 温州大学生命与环境科学学院，浙江温州，325000 |
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| Abstract: |
| Liquid polymeric ferric sulfate (PFS) was prepared from paper mill sludge containing ferric using sodium chlorate as oxidant. Effects of acid extraction temperature and time on ferric extraction efficiency were investigated. The influence of sodium chlorate dosage, oxidation time and temperature on the quality of PFS in term of Fe2+ concentration was studied. Extraction was favored at reaction time 5 h and temperature 80~90℃. The quality of liquid PFS obtained under the ratio of sodium chlorate to ferric ions of 0.18, reaction time of 3 h met the requirement of the first class of the national standard. The flocculation properties of PFS was further compared with commercial PFS and polyaluminium chloride (PAC). Results showed prepared PFS was more efficient than commercial PFS and PAC for COD removal of pulp mill waste water, and the proper dosage was 30~45 mg/L; there was no significant difference between prepared PFS and commercial one for COD removal of pharmaceutical waste water, and the proper dosage of prepared PFS was 20~30 mg/L. |
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