Study On Reinforcing In-Situ Remediation By Carbon Fiber In Aquaculture Water Treatment

This topic is to use biological carbon fiber’s excellent adsporption performance and good biocompatibility to strengthen biological in-situ remediation technology, and using this technology in aquaculture water purification. In experiment of water exchanging rate, we tested the capacity of strengthen in-situ bioremediation’s treatmenting by purifying aquaculture water in the simulated intensive environment. We kept the pH in the range of7to8.5, dissolved oxygen in the range of6.5mg·L-1to7.5mg·L-1, we can conclude that the group reinforced by optimal density biological carbon fiber compared to the group without any purification meature, the periods for changing water can be prolong more than300%, and compared to non-biological carbon fiber reinforced group the periods for changing water can be prolong150%. Comparing with the average quality of water in the two months, the NH4+-N on average decreased 31.3%and30.3%to the control group and no enhancement group; the average level of NO2--N decreased52.7%and12%, the average turbidity decreased94.8%and64.2%. The reinforced experimental group prolong the periods of water while maintaining the better water quality.The experiment of various factors’contribution in same period of changing water show that:in treatmenting NH4+-N、NO2--N、turbidity and COD, the group of microbial remediation reinforced by carbon fiber has respectively reduced36.1%、71.5%、91.16%、50.63%,the group of plant remediation has respectively reduced22%、7.6%、84.29%、34.5%,the comprehensive strengthening group has respectively reduced50.6%、73.8%、96.6%、54.1%.Both of these two purification method have achieved good results, but the microbial remediation is better.The experiment of DO show that:when using the biological in-situ remediation technology which strengthen by biological carbon fiber in purifying high density aquaculture water, DO in the has played a very important role in reducing NH4+-N and NO2--N. In the high density aquaculture water, in order to keep NH4+-N in a low level, we should keep the DO at7mg·L-1around,and for the NO2-N,wo should keep the DO above6.5mg·L-1.On account of above experiments, we strengthen artificial floating islands by carbon fiber implement engineering test, the result show that: through the about4month experiment period, the rate of every day’s water exchanging is0.85%,which could meet the requirement of circulating water aquaculture; the average concentration of NH4+-N is at o.5mg·L-1around, and in the excellent stage the average concentration of NH4+-N is below0,4mg·L-1;the average concentration of NO2-N of pool1is at0.14mg·L-1around, and pool2s’is at0.1mg·L-1around; the turbidity of these two pools both keep below10,the water is clear and bright; the average concentration of COD is at25mg·L-1the plants growed very well, so the aquaculture water could provide enough nutrient to satisfy the needs of plant growth; fish growth in good condition, the situ repair hasn’t made any negative effect on fish’s normal life, there is no disease and high survival rate of fish, moreover the fish grow quickly. Biological carbon fiber reinforcement in situ repair, as a kind of purification method to treatment micro processing pollution and eutrophication water, with it’s low investment, high efficiency and no secondary pollution to environment, has a wide application prospect in intensive aquaculture water treatment.