牙鲆养殖循环系统中固体废物的去除研究

Removal performance of solid wastes in Japanese flounder(Paralichthys olivaceus) culture in a recirculating system

对自行设计的牙鲆Paralichthys olivaceus循环养殖系统采用斜板式沉淀槽、水力旋流器、泡沫分离器去除固体颗粒物的效果进行了研究。结果表明:该系统实际运行过程中,养殖槽的固体颗粒物含量小于10 mg/L;对养殖水中总悬浮固体颗粒物的去除能力,沉淀槽最强,去除量(干重,下同)为(11.3±3.5)g/d,占69.2%,水力旋流器为(4.8±1.0)g/d,占29.5%,泡沫分离器为(0.2±0.1)g/d,占1.3%;对难沉降颗粒物的去除能力,泡沫分离器较强,去除量为(4.2±1.1)g/d,占53.1%,其中挥发性悬浮固体占93.2%,沉淀槽为(3.6±0.7)g/d,占44.8%,水力旋流器为(0.2±0.0)g/d,占2.1%;牙鲆摄食饲料所产生的固体废物量(干重)约为245.8 g/kg。

The solid wastes in Japanese flounder（ Paralichthys olivaceus） cuhure was eliminated by settling basin, hydrocyclone, and foam fractionator in a recirculating system. There was less than 10 mg/L of particles in the rearing tanks because the dry weight of solids removal by settling basin, foam fractionator, and hydrocyclone was （ 11.3 ± 3.5）, （4. 8 ± 1.0） and （0.2 ± 0.1 ） g/d, respectively. A better removal performance of non - settleable solids was found in the foam fractionator which eliminated （4. 2 ± 1.1 ） g/d of dry weight of solid wastes containing 93.2% of volatile suspended solids. Approximately 245.8 g of dry weight of solids waste was produced per kg of feed.