Development of the Edible Mushroom Cultivation Technology Based on the Combined Use of Sewage Sludge and Local Biomass

Abstract

 In this study, we investigated if sewage sludge (dehydrated sludge) could be a nutrient supplement for growing oyster mushrooms, aiming for the expanded use of biomass generated from sewage treatment plants. As the result, though the sewage sludge was not effective alone, it accelerated mycelial growth, shortened the cultivating term by 10 days (the maximum) and increased the yield by 20% per 10g of the medium when it was combined with dry solid sweet potato shochu-lees. As for the nutritional effect, the fruit bodies from the sewage sludge and dry solid sweet potato shochu-lees media contained 3.4 times of free amino acid compared with those from the conventional media. No heavy metals such as Cr, were not detected in the fruit bodies from the sewage sludge and dry solid sweet potato shochu-lees media.