Abstract
This study aims to probe the potential adsorbent of the biochar produced from spent mushroom substrate (SMS), of which pyrolysis temperature is 400°C, in improving the qualities of sediment and water quality in aquaculture pond. In the first trial, the adsorption of biochars to the ammonia-N and nitrite-N in water was evaluated, and the results showed that the SMS-derived biochars had the ability to adsorb ammonia-N rather than nitrite-N. Additionally, the adsorption capability of biochars to ammonia-N decreased as ambient salinity was increased. The SMS-derived biochars can also increase the pH of water. In view of the improvement of sediment, SMS-derived biochars was able to increase sediment pH and decrease the levels of ammonia-N and sulphite in sediments. In field trial, SMS-derived biochars was applied to a red claw crayfish farming. As the SMS-derived biochars had been thrown to the crayfish pond, pond conditions were improved because the pH of water and sediment increased, and the level of ammonia-N in water decreased, and the levels of ammonia-N and sulphide in sediment decreased. Therefore, the SMS-derived biochars was considered great potential as sorbents to adsorb the toxic substances, such as ammonia-N and sulphide in water and sediment.
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