The feasibility of separating aquaculture waste based on the principle of energy dissipation in orifice plates
Residual feed and excrement are the main pollution sources in aquaculture,which often lead to water eu-trophication,pathogen breeding,and ecological imbalance,endangering the health of aquatic animals and local aquatic ec-ological safety.Development and utilization new solid-liquid separation technology and transferring the aquaculture waste out of the culture system timely and efficiently is the key to solve the pollution of aquaculture.In the present study,we introduced a new solid-liquid separation technology for the efficient removal of aquaculture waste based on the energy dis-sipation principle of the orifice plate.Then,a five-week feeding trial was conducted to evaluate the efficiency of the orifice plate in separating aquaculture waste,in which 192 Carassius auratus of(28.16±0.43)g in weight were assigned to six tanks at random,and a commercial diet was used.Culture water was sampled on the 0st,1st,2nd,5th,10th,15th,20th,25th,30th,and 35th day for water quality determination and the indexes determined were suspended solids,permanganate index,total nitrogen,total phosphorus,ammonia nitrogen,and nitrite nitrogen contents.The results showed that all in-dexes determined were significantly lower in orifice plate groups than those in control groups throughout the whole trial(P＜0.05).The orifice plate showed the greatest efficiency in controlling nitrite nitrogen,followed by suspended solids.Moreover,fish growth performance in the orifice plate group was also better than in the control group,though the differ-ence was insignificant.A further in-depth study on factors that affect waste collection efficiency will even improve its power and establish efficient in situ separation technology for the aquaculture industry,and in turn,promote sustainable development of aquaculture.
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