Evaluation of on-farm biological treatment processes for wastewaters from vegetable peeling

This study highlights the need for the development of simple, efficient, and cost-effective farm-scale applications to treat wastewater arising from vegetable-peeling operations. The aim was to evaluate two full-scale biological wastewater treatment systems, a sequencing batch reactor (SBR) and a bi...

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Bibliographic Details
Published in:	Environmental technology Vol. 30; no. 1; pp. 3 - 10
Main Authors:	Lehto, M., Sipilä, I., Sorvala, S., Hellstedt, M., Kymäläinen, H.-R., Sjöberg, A.-M.
Format:	Journal Article
Language:	English
Published:	Abingdon Taylor & Francis Group 01-01-2009 Taylor & Francis
Subjects:	Agriculture - methods Applied sciences Biological and medical sciences Bioreactors Biotechnology Chemical engineering Exact sciences and technology Food Handling - methods Fundamental and applied biological sciences. Psychology General purification processes General treatment and storage processes Methods. Procedures. Technologies Others Pollution Reactors SBR Seasons Solanum tuberosum Various methods and equipments vegetable peelings Vegetables Waste Disposal, Fluid - methods Wastes wastewater treatment Wastewaters Water treatment and pollution British Isles SBR Edible species Waste treatment wastewater treatment Sulfates vegetable peelings Waste water Biological purification Design Trophic chain Potato Bioreactor Sequencing batch reactor Chemical oxygen demand Water quality pH Biological treatment Biofilter Waste water purification
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Summary:	This study highlights the need for the development of simple, efficient, and cost-effective farm-scale applications to treat wastewater arising from vegetable-peeling operations. The aim was to evaluate two full-scale biological wastewater treatment systems, a sequencing batch reactor (SBR) and a biofilter, and a chemical wastewater treatment system on farms carrying out peeling of vegetables. The types, design criteria and parameters of the processes, as well as properties of the untreated and treated wastewaters were presented and evaluated. Seven-day biochemical oxygen demand (BOD 7 ) entering the SBR was 3100 ± 529 mg l −1 (mean ± standard deviation). The results showed that the SBR was very stable and effective in the treatment of carrot-processing wastewaters, the BOD 7 for effluent being about 10 mg l −1 . The biofilter examined did not operate well because the pH too low: the reduction for BOD 7 was 63% and, for COD, 58%. When wastewater from potato processing was treated with aluminium sulphate and conveyed to an artificial pond, removal of BOD 7 was 67% and that of COD 69%. This method is only suitable for pre- or post-treatment of these wastewaters. Control of the treatment processes appeared to be essential for their proper functioning.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0959-3330 1479-487X
DOI:	10.1080/09593330802417019