河蟹工厂化育苗中人工半咸水的净化与循环利用

Purification and Re-utilization of Formulated Brackish Water in Recirculating System for Artificial Breeding of Mitten Crab

采用室内、室外大循环的水交换形式及生物净化和物理、化学处理相结合的方法，对河蟹育苗废水进行净化与循环利用，可将育苗用人工半咸水的利用率提高２～３倍，节约配水原料５０％以上。另外，把育苗废水的生物净化与单胞藻、轮虫的培养结合在一起，既可净化水质，又能为蟹苗提供大量的生物饵料。试验池蟹苗的成活率较对照池提高１．０％～２．５％。

In the indoor and outdoor water recirculating system, the methods of bio purification combined with physi-chemical treatment were adopted to purify and re-utilize the waste water from artificial breeding of mitten crab. The results showed that the utilization rate of the formulated brackish water in hatchery could be increased 2- 3 times and over 50% of the raw materials for brackish water preparation could be saved. Basides,bio -purification of waste water was combined with cultivation of single -celled algae and rotifers, thus improving the water quality and providing food organisms for crab seeds at the same time. The survival rates in the experimental tanks were 1. 0-2. 5% higher than those in the control.