Toxicity of domestic wastewater pH to key species within an innovative decentralised vermifiltration system
Hughes, R.J., Nair, J., Mathew, K. and Ho, G. (2007) Toxicity of domestic wastewater pH to key species within an innovative decentralised vermifiltration system. In: Small Water and Wastewater Systems VII: 7th IWA International Specialty Conference on Small Water and Wastewater Systems, 7-10 March 2006, Mexico City.
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The development of innovative decentralised wastewater treatment systems is pertinent to environmental sustainability. However for their appropriate use they require significant research and design to ensure they can be relied upon in the future and in most cases they have received less attention and research than large-scale sewage systems. This study assessed the likelihood of biological inhibition and disruption from pH to key species for vermifiltration. The test firstly assessed the buffer capacity of a vermicompost + manure media finding it had a relatively high buffering capacity for pH. The toxicity after the buffer capacity experiment showed that the species would survive between pH levels of 6.2 and 9.7. At the higher and lower pH levels however the survival of juveniles was impaired, probably due to their ability to uptake greater amounts of soluble salts and inability to regulate them. Overall the study showed that the tolerance of the key vermifiltration species to pH was far less than their survival as previously proposed and further research assessing their long-term population dynamics in a vermifiltration system with pH is warranted.
|Publication Type:||Conference Paper|
|Murdoch Affiliation:||Environmental Technology Centre|
|Publisher:||International Water Association Publishing|
|Copyright:||© IWA Publishing 2007.|
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