Nitrogen Transformations in a Polluted Estuary

Wilkinson, Louise

doi:10.1016/b978-1-4832-8391-3.50056-7

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…Occurrence of species of Ulva and Enteromorpha in quantity has been reported by several workers in estuaries, harbours and in shore waters polluted by sewage and high nitrate content present in sewage effluents was found to be responsible for the fertüizing effects and prolific growth of these algae (Nasr and Aleem 1948, Wilkinson 1963, Subbaramiah and Parekh 1966, Burrows 1971. Similar response in growth was not observed in the present studies and Ulvafasciata was not collected from Visakhapatnam Harbour during our regulär visits, though this alga grows äs a dominant member in the intertidal region along the coastline of Visakhapatnam (Umamaheswara Rao and Sreeramulu 1964).…”

Section: Discussionmentioning

confidence: 92%

On the Growth and Survival of Ulva fasciata in the Polluted Waters of Visakhapatnam Harbour

Sreeramulu¹,

Rao²,

Premila³

1977

Botanica Marina

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Experiments were conducted to assess the effects of polluted seawater of the Visakhapatnam Harbour o n the growth and survival of Ulva fasciata Delile. Rapid degeneration of ülva discs with marked reduction in growth was observed in the waters collected near Southern lighter canal which are polluted by untreated town sewage. In the waters of Northern and Western arrns of the Harbour, growth rate was slightly more than that observed in unpolluted seawater used äs control, but 22 to 30 per cent of Ulva discs died at end of the experiments. Results of these experiments indicate that the waters of Visakhapatnam Harbour are toxic to the growth of Ulva fasciata and waters of Southern lighter canal are more polluted than the waters of Northern and Western arms.

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Section: Discussionmentioning

confidence: 92%

On the Growth and Survival of Ulva fasciata in the Polluted Waters of Visakhapatnam Harbour

Sreeramulu¹,

Rao²,

Premila³

1977

Botanica Marina

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“…Many observations have been made over the years which help us to understal something of the effects of pollution, but which cannot themselves be used lrx indicator purposes. Attention was drawn at the beginning of this century to te apparent correlation between sewage pollution of estuaries and the presence f extensive sheets of Ulva latissima (= U. lacuta L.) which on o ticularly after a hot summer, could cause considerable inconvenience by the sml they generated on decomposition and even by blackening paint on nearby hous due to the action of the hydrogen sulphide produced (Letts & Richards 19151 Cotton 1911 Wilkinson (1964) has shov that Ulva responds to the presence of sewage pollution in a number of ways: it ch make use of nitrogen in the form of ammonia and under polluted conditions t!' plants have a high nitrogen and organic sulphur content compared with that und' unpolluted conditions.…”

Section: Hartley Botanicalmentioning

confidence: 99%

Assessment of pollution effects by the use of algae

1971

Proc. R. Soc. Lond. B.

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An attempt has been made to use the growth rate in culture of some of the larger attached algae for indication of pollution. Ulva lactua has a high potential from this point of view because of the ease with which it can be cultured and also because of its reactions to pollution by sewage. The growth rate of Laminaria saccharina shows a graded response to changes in total medium and physical conditions and to concentrations of added single substances. This species could be a useful pollution indicator, not only because of its sensitivity to changes, but also because of the part it plays in the ecosystems round our coasts.

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“…To these, ought to be added a production of 50000 m 3 H 2 S, as estimated according to Wilkinson (1963). Ulva harvest and its treatment appear, in the light of these observations, as an absolute necessity (Charlier & Morand, 2005).…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Digestion of Ulva sp. 3. Liquefaction Juices Extraction by Pressing and a Technico-Economic Budget

Morand

Briand

Charlier³

2006

J Appl Phycol

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In many countries, the algae of "green tides" are harvested in the fight against pollution. Ulva often represents the main component of the tide, and intensive research has been conducted on the possibility to use the algae as a methanisation substrate. However, methanisation is hampered by various practical obstacles, which requires a compromise between productivity and biological yield.The process described here calls upon a pre-digestion phase of Ulva which, besides the economy of time and volume of the digestion, makes it possible to obtain a biogas of good quality. The methanisation substrate is the hydrolysis juice collected by draining, followed by pressing. The cake resulting from the pressing process can be used as organic enriching or fertilizing agent in agriculture. Various presses were tested. The screw press was found the most suitable to recover a great quantity of sufficiently loaded pressing juice after only a short hydrolysis time. For a 3 month hydrolysis period, the different fractions amounted to 158 L of hydrolysis juice, 192 L of pressing juice, and 0.075 m 3 of cake per m 3 of initial algae.The bi-phasic anaerobic digestion with forced recuperation of juices offers interesting pollution abatement perspectives, with total and soluble chemical oxygen demand cleaning rates of respectively 79 and 95% during the methanogenic phase, for a volume productivity of 1.5 m 3 CH 4 m −3 digester day −1 . The quality of the Ulva juice also makes it suitable for use as substrate for industrial processes or co-substrate of methanisation in pre-existing reactors, so that subsequent investment could be avoided.

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Nitrogen Transformations in a Polluted Estuary

Cited by 6 publications

References 3 publications

On the Growth and Survival of Ulva fasciata in the Polluted Waters of Visakhapatnam Harbour

On the Growth and Survival of Ulva fasciata in the Polluted Waters of Visakhapatnam Harbour

Assessment of pollution effects by the use of algae

Anaerobic Digestion of Ulva sp. 3. Liquefaction Juices Extraction by Pressing and a Technico-Economic Budget

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