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S.W. Hobma

Bio: S.W. Hobma is an academic researcher. The author has contributed to research in topics: Sewage treatment & Anaerobic filter. The author has an hindex of 5, co-authored 7 publications receiving 1624 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the main results obtained with the process in the laboratory as well as in 6 m3 pilot plant and 200 m3 full-scale experiments are presented and evaluated in this paper.
Abstract: In recent years considerable effort has been made in the Netherlands toward the development of a more sophisticated anaerobic treatment process, suitable for treating low a strength wastes and for applications at liquid detention times of 3–4 hr. The efforts have resulted in new type of upflow anaerobic sludge blanket (UASB) process, which in recent 6 m3 pilot-plant experiments has shown to be capable of handling organic space loads of 15–40 kg chemical oxygen demand (COD)·m−3/day at 3–8 hr liquid detention times. In the first 200 m3 full-scale plant of the UASB concept, organic space loadings of up to 16 kg COD·m−3/day could be treated satisfactorily at a detention times of 4 hr, using sugar beet waste as feed. The main results obtained with the process in the laboratory as well as in 6 m3 pilot plant and 200 m3 full-scale experiments are presented and evaluated in this paper. Special attention is given to the main operating characteristics of the UASB reactor concept. Moreover, some preliminary results are presented of laboratory experiments concerning the use of the USB reactor concept for denitrification as well as for the acid formation step in anaerobic treatment. For both purposes the process looks feasible because very satisfactory results with respect to denitrification and acid formation can be achieved at very high hydraulic loads (12 day−1) and high organic loading rates, i.e., 20 kg COD·m−3/day in the denitrification and 60–80 kg COD·m−3/day in the acid formation experiments.

1,339 citations

Journal ArticleDOI
TL;DR: High-Rate Anaerobic Waste-Water Treatment Using the UASB Reactor under a Wide Range of Temperature Conditions under a wide range of temperature conditions is described.
Abstract: (1984). High-Rate Anaerobic Waste-Water Treatment Using the UASB Reactor under a Wide Range of Temperature Conditions. Biotechnology and Genetic Engineering Reviews: Vol. 2, No. 1, pp. 253-284.

192 citations

Journal ArticleDOI
TL;DR: In this paper, the authors contribute to the assesment of a (more) optimal design and operation of a high-rate anaerobic waste water treatment process by making use of available information of modern Anaerobic Waste Water Treatment processes, such as the upflow Anaerobic Sludge Blanket process and recently introduced Attached Film processes.

97 citations

Book ChapterDOI
TL;DR: In this paper, the Upflow Anaerobic Sludge Blanket (UASB) process was shown to be feasible for handling a large variety of industrial wastes at exceptionally high organic loading and hydraulic loading rates.
Abstract: Comprehensive laboratory and pilot plant studies conducted in recent years in The Netherlands have resulted in the development of a new anaerobic treatment process, i.e. the Upflow Anaerobic Sludge Blanket (UASB) process, which was shown to be feasible for handling a large variety of industrial wastes at exceptionally high organic loading and hydraulic loading rates. So with sugar beet and potato processing wastes organic loading rates have been applied up to 30 and 45 kg COD m −3 day −1 respectively at 27–35 °C and liquid retention times of 4–8 hrs. In addition to the treatment of low strength industrial wastes the UASB-process has been investigated for its feasibility in treating domestic sewage. Results obtained in 1–2 m high UASB-reactors indicate that anaerobic pretreatment of domestic sewage may represent an attractive proposition, because it was shown that: (a) 50–80% COD-reduction could be obtained in 12–24 hrs retention time at a temperature between 13 and 30 °C; (b) the process can be combined — if required — with various simple post-treatment methods in order to achieve a 90% COD-reduction. An active anaerobic sludge can be preserved unfed for a period of one year and more, the application of anaerobic treatment for wastes of campaign industries and of domestic sewage originating from camping sites is very attractive. Moreover, the UASB process in its full-scale design is fairly simple and cheap, and the process can be well combined with other recycle methods, such as for NH + 4 -N. The main features of the UASB process as well as the results obtained with the process in pilot and full-scale plants with various types of waste ( e.g. of the sugar beet, potato processing industry, domestic sewage) will be described and evaluated.

6 citations


Cited by
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Journal ArticleDOI
TL;DR: This paper provides a critical review on the current technologies available for decolourisation of textile wastewaters and it suggests effective and economically attractive alternatives.

1,242 citations

Journal ArticleDOI
TL;DR: There are several biological processing strategies that produce bioenergy or biochemicals while treating industrial and agricultural wastewater, including methanogenic anaerobic digestion, biological hydrogen production, microbial fuel cells and fermentation for production of valuable products, but there are also scientific and technical barriers to the implementation of these strategies.

1,122 citations

Journal ArticleDOI
TL;DR: These challenges are identified, an overview of their implications for the feasibility of bioelectrochemical wastewater treatment is provided and the opportunities for future BESs are explored.

1,090 citations

Journal ArticleDOI
TL;DR: The transfer of hydrogen and formate between bacteria and archaea that helps to sustain growth in syntrophic methanogenic communities is reviewed and the process of reverse electron transfer is described, which is a key requirement in obligately syntrophic interactions.
Abstract: Interspecies electron transfer is a key process in methanogenic and sulphate-reducing environments. Bacteria and archaea that live in syntrophic communities take advantage of the metabolic abilities of their syntrophic partner to overcome energy barriers and break down compounds that they cannot digest by themselves. Here, we review the transfer of hydrogen and formate between bacteria and archaea that helps to sustain growth in syntrophic methanogenic communities. We also describe the process of reverse electron transfer, which is a key requirement in obligately syntrophic interactions. Anaerobic methane oxidation coupled to sulphate reduction is also carried out by syntrophic communities of bacteria and archaea but, as we discuss, the exact mechanism of this syntrophic interaction is not yet understood.

1,052 citations

Journal ArticleDOI
TL;DR: The various techniques, which could be used to enhance the gas production rate from solid substrates are reviewed.

978 citations