Abstract
The addition of excess coagulant and lowering the coagulation pH in order to improve the removal of NOM and DBP precursors have been defined as ‘enhanced coagulation’. However, as a consequence, sludge production and treatment costs are increased, and the chemical storage and feed facilities need to be changed. Through developments in coagulant chemistry, various types of pre-polymerised coagulants have been prepared in recent years and been applied widely. In comparison to conventional coagulants under such ‘enhanced coagulation’ conditions, pre-polymerised coagulants can improve NOM and THMFP removals at relatively lower dosages. In addition, this results in a reduction in the sludge production and treatment costs, and the existing facilities in a water treatment works need not be changed by the use of pre-polymerised coagulants.
Original language | English |
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Pages (from-to) | 937-950 |
Number of pages | 14 |
Journal | Environmental Technology (United Kingdom) |
Volume | 17 |
Issue number | 9 |
DOIs | |
Publication status | Published - Sept 1996 |
Externally published | Yes |
Keywords
- Enhanced coagulation
- poly-aluminium coagulants
- poly-ferric coagulants
- natural organic matter (NOM)
- trihalomethane formation potential (THMFP)
- sludge production
ASJC Scopus subject areas
- Environmental Chemistry
- Water Science and Technology
- Waste Management and Disposal