猪场污水中浮萍生物量和淀粉含量变化研究

The analysis of the biomass and starch content of duckweed growing in swine wastewater

以四川常见的青萍(Lemna minor)、少根紫萍(Spirodela olygorrhiza)、稀脉浮萍(L.perpusilla)和紫萍(S.polyrrhiza)为研究对象,研究了猪场污水浓度和接种量对其生物产量和淀粉含量的影响.结果表明在5%的猪场污水中,浮萍科的4个种都有较高的生长速率.在35.4 g/m^2的接种量时,青萍的淀粉含量最高可以达到干重的32.9%;在17.7 g/m^2的接种量时,少根紫萍、稀脉浮萍和紫萍的最高淀粉含量分别可达到干重的44.4%、38.0%和35.5%.在单位时间内,紫萍具有更大的生物产量,每公顷每年的产量(鲜重)89.7t,但淀粉含量偏低.经综合研究比较,在四川地区气候条件下,少根紫萍能够制造更多淀粉,每公顷每年大约能生产淀粉11.4 t,适宜作为能源植物推广.

The biomass and starch content of duckweed Lemna minor, Spirodela olygorrhiza, L. perpusilla and S. polyrrhiza, collected from Chengdu in Sichuan, were investigated when they were cultured in swine wastewater. The results showed the common duckweed could grow fast in the 5% swine waste water. At an optimal initial inoculum size of 35.4 g/m2, the maximum starch content of Lemna minor was 32.9% on a dry weight basis. At an optimal initial inoculum size of 17.7g/m2, the highest starch content of S. olygorrhiza, L. perpusilla and S. polyrrhiza was 44.4%,38.0% and 35.5% on a dry weight basis, respectively. In the climate condition of Chengdu, S. polyrrhiza could produce the most biomass and S. olygorrhiza could produce the most starch.S. polyrrhiza could produce 89.7 tons biomass（fresh weight） per hectare per year. S. olygorrhiza could produce 11.4 tons starch per hectare per year and would be able to be a new energy plant widely used.