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Combined ozonation and biofilm treatment for reuse of papermill wastewaters.
- Source :
-
Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2004; Vol. 49 (4), pp. 319-23. - Publication Year :
- 2004
-
Abstract
- A process of advanced oxidation treatment discussed here has been developed in the last seven years. A technical plant for treatment of paper mill wastewater started operation in 1999. Advanced oxidation treatment is defined here as a combination of chemical and biochemical oxidation applied to a completely biodegraded effluent. The process is a combination of ozonation with following biodegradation in a biofilm reactor. The combination makes use of the effect of partial oxidation in which with reduced use of expensive chemical oxidants persistent COD becomes biodegradable. A far-reaching elimination of AOX, colour and other disturbing substances like complexing agents is achieved simultaneously. The partially oxidized compounds, now biodegradable, are eliminated in a following biofilm reactor. Using single-stage systems, COD elimination rates of up to 60% are achieved with 0.4 to 1.0 g ozone per g COD eliminated in the combined process. With a two-stage system COD elimination of 85% with 0.65 g/g has been achieved in pilot tests. The quality of the treated effluent suits fresh water requirements for most types of paper production, so that either a total closure of the water circuits or - due to increasing concentrations of electrolytes, which are not eliminated by this process - a substantial closure to about 20% of the original amount of fresh water can be achieved.
Details
- Language :
- English
- ISSN :
- 0273-1223
- Volume :
- 49
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Water science and technology : a journal of the International Association on Water Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 15077990