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Soil bioassays as tools for sludge compost quality assessment.
Xavier Domene1, Laura Solà, Wilson Ramírez
1Center for Ecological Research and Forestry Applications (CREAF), Facultat de Ciències i Biociències, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain. x.domene@creaf.uab.es
Waste Management (New York, N.Y.)
|November 16, 2010
Summary
Compost bioassays reveal that plant germination and collembolan reproduction are inhibited by unstable compost, while earthworms benefit. These tests effectively assess compost quality for safe soil reuse.
Area of Science:
- Environmental Science
- Soil Science
- Waste Management
Background:
- Composting is a key waste management strategy for sewage sludge reuse in soil.
- Increasing sludge production necessitates reliable methods for assessing compost quality.
- Bioassays are crucial for evaluating the ecological safety and quality of compost.
Purpose of the Study:
- To assess the utility of various bioassays for compost quality evaluation.
- To investigate the impact of compost stability and decomposition end-products on bioassay organisms.
- To determine the sensitivity of bioassays in differentiating compost quality from different processes.
Main Methods:
- Compost samples were collected throughout the composting process from two plants.
- Bioassays included plant germination, earthworm survival/biomass/reproduction, and collembolan survival/reproduction.
- Compost samples were characterized for organic matter stability and decomposition end-products.
Main Results:
- Noxious effects in bioassays correlated with low organic matter stability and high decomposition end-products.
- Plant germination and collembolan reproduction were inhibited by uncomposted sludge.
- Earthworm biomass and reproduction were enhanced by sludge, while survival was unaffected by composting degree.
Conclusions:
- Bioassays are sensitive and useful tools for assessing compost quality.
- Compost stability and decomposition end-products significantly influence bioassay outcomes.
- Different composting processes yield composts with varying qualities, detectable by bioassays.
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