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Studies on the Circulating Water Treatment Technique and Cultural Effect for Eel Cultivation

Author: ZhangZhe
Tutor: GuanRuiZhang
School: Jimei University
Course: Aquaculture
Keywords: Recirculation Aquaculture mode The pond intensive mode Aquaculture wastewater treatment system Eel culture Microporous aeration
CLC: S959
Type: Master's thesis
Year: 2011
Downloads: 87
Quote: 1
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Abstract

In recent years with the increased pollution of the water environment, and rely on good water aquaculture eel has been a great challenge, which makes the development of recycling water aquaculture mode is of particular significance. Our group to design a simple cycle of eel aquaculture system, the system consists of A, B two different sets of sewage treatment process: two sets of sewage treatment area were 302.86 m ^{2 196.17 m ^{2 , A set of treatment process for aquaculture wastewater in turn flows through the downstream biofilm pool, upstream biofilm pool, downlink the oyster shell pool and uplink oyster shell pool biological and physical purification; farming sewage B sets only flowing through the downstream oyster shell pool and the upstream pool purification of oyster shells into the breeding pool, and then through the aeration recycling. This thesis is focused on two sets of process to carry out pilot studies A different sets of daily sewage treatment capacity of its treatment effect, compare A and B two sets of treatment effect differences, compare A set of polyamide silk and B sets of oyster shells, two kinds the filler processing performance while the oxygen effect is a recirculating aquaculture different aerobic equipment as well as ponds intensive mode with the mode of recirculating aquaculture eel farming effects, the results are as follows. 1.A sleeve sewage treatment effect. Three different daily sewage treatment capacity, the biofilm pool and the series of oyster shell pool mode farming sewage treatment has a significant effect. A set treatment pond TAN (ammonia), NO ₂ ^{- -N, turbidity average daily processing capacity of 672 m ^{3 removal rates were 86.53 ± 2.03%, 95.32 ± 1.54%, 90.5 ± 2.4%, influent pH of 7.39, the effluent pH of 8.56. Daily processing capacity of 846 m ^{3 on the the TAN, N0 ₂ ^{- -N, turbidity average removal rate of 82.3 ± 3.83 %, 94.2 ± 1.34%, 91.5 ± 2.6%, influent pH 7.39, the effluent pH 8.26; daily processing capacity of 1560 m ^{3 , TAN, NO _{2 ^{- -N, turbidity average removal rate was 58.25 ± 8.88%, 86.92 ± 1.51%, 88.9 ± 3.5%, influent pH 7.53, the effluent pH 8.05. With the increasing amount of daily processing, reduce the removal efficiency of the system, the effluent quality meet Fisheries water quality standards. 2 Comparative Study of A, B two sets of process wastewater treatment effect. The results show that the daily processing capacity of 432m ^{3 / d under the conditions of the sets A and B sets treatment pond effluent pH were increased influent pH was 7.36, the effluent pH increased to 8.65 and 8.87, respectively. The influent DO (dissolved oxygen) to 8.89 ± 0.93 mg / L, the effluent DO were 9.34 ± 0.69 mg / L and 8.28 ± 0.75 mg / L. Sets A and B sets treatment pond turbidity removal rates reached 94.54 ± 2.43% and 91.73 ± 3.94%. Of ammonia removal unit area were 1325.13 ± 171.49 mg / (m ^{2 · d) and 1838.81 ± 269.16 mg / (m ^{2 · d) per unit area both the removal has a significant difference (P LT; 0.05). Remove the amount of nitrite nitrogen per unit area were 687.53 ± 91.66 mg / (m ^{2 · d) and 678.27 ± 122.74 mg / (m ^{2 · d) per unit area to remove the amount of both is not a significant difference (P>; 0.05). 3 different daily sewage treatment capacity. To compare A set of processing pool polyamide elastic filler and B sets of processing pool oyster shell filler treatment effect. In comparative tests, the daily processing capacity of 432 m ^{3 / d when polyamide elastic filler and oyster shell packing unit area of ??ammonia removal respectively 2238.63 ± 168.83 mg / (m ^{2 · d) and 1625.94 ± 181.28 mg / (m ^{2 · d); nitrite nitrogen removal respectively 1142.64 ± 317.29 mg / (m ^{2 < / sup> · d) and 862.52 ± 236.12 mg / (m ^{2 · d); reactive phosphorus removal were 1347.84 ± 535.17 mg / (m ^{2 · d) and 1548.86 ± 491.76 mg / (m ^{2 · d); removal of CODcr were 91597.36 ± 8262.62 mg / (m ^{2 · d) and 68157.21 ± 7415.47 mg / (m ^{2 · d). Daily processing capacity of up to the 672 m ^{3 / d, polyamide elastic fillers and oyster shell packing unit area of ??ammonia removal respectively 2217.64 ± 878.19 mg / (m ^{2 · d) and 1486.47 ± 664.19 mg / (m ^{2 · d); nitrite nitrogen removal was 937.43 ± 147.19 mg / (m ^{2 · d) and 611.10 ± 95.78 mg / (m ^{2 · d); reactive phosphorus removal were 923.44 ± 233.00 mg / (m ^{2 · d) ^{2 · d) and 1607.59 ± 300.34 mg / (m; removal of CODcr were 73734.93 ± 3934.23 mg / (m ^{2 · d) and 55935.16 ± 2050.11 mg / (m ^{2 · d). 4. Application A set of recirculating aquaculture mode with traditional pond intensive mode of comparison. Results show that using indoor recirculating aquaculture mode eels growth rate of 56.9%, feed conversion rate of 60.6%, the survival rate was 99.9%, the of eels using the traditional pond intensive mode growth rate was 25.0%, feed conversion rate of 56.5 %, the survival rate was 97.6%, and The recirculating aquaculture mode, TAN concentration of 0.61 ± 0.31 mg / L NO2 - N mass concentration was 0.15 ± 0.10 mg / L DO concentration of 5.46 ± 0.56 mg / L, pH was 7.36 ± 0.26, Pond intensive mode the TAN mass concentration of 0.84 ± 0.15 mg / L NO2 - N mass concentration of 0.11 ± 0.06 mg / L DO concentration of 6.08 ± 0.60 mg / L, pH 7.53 ± 0.06, meet the quality requirements of eel growth. In energy saving mode units of recirculating aquaculture farming area savings of more than about 10.2% of the electrical energy, farming sewage recycling rate to 83.7%, with good economic and ecological benefits. Application of microporous aeration, paddlewheel aerator in two ways oxygen effect comparison. Eel recirculating aquaculture, not containing the fish, the aerobic capacity of the two oxygen way has a highly significant difference (P lt; 0.01), of microporous aeration than paddlewheel aerator units water aerobic capacity increased by 15.85%, the the aerator power efficiency is 2.36 times the paddlewheel aerator. In the case containing the fish farming, of microporous aeration test pool surface water average dissolved oxygen value of 5.81 ± 0.14 mg / L, and use paddlewheel aerator surface average dissolved oxygen value of 6.39 ± 0.25 mg / L, the former was significantly lower than that of the latter (P lt; 0.05), but the bottom water dissolved oxygen 5.74 ± 0.14 mg / L and 5.75 ± 0.26 mg / L respectively, both were no significant differences (P gt; 0.05). Microporous aeration way unit farming the paddlewheel aerator saves 57.6% of electricity than water, and no security risks. Microporous aeration pond liquidity, reduced energy consumption of eel activities, and the water temperature is higher, increased food intake. Therefore, the microporous aeration of eel farming better. A set of treatment pond in the amount of three sewage treatment, water quality and stability, and comply with the quality requirements of eel growth in daily production. A B two sets of treatment ponds mass concentration of the treatment effect on the water quality indicators significantly, the effluent pH were higher phenomenon, where B sets per unit area of ??the turbidity and nitrite nitrogen removal A set of fairly and B sets of simple structure, low-cost processing. A B sets in two fillers processing performance differences significantly polyamide filler because of its large surface area, removal of ammonia nitrogen, nitrite nitrogen and CODcr better, but not as reactive phosphorus and turbidity removal The oyster shell filler B sets new treatment pond less overall biofouling, the treatment effect needs further study, therefore, in the production of oyster shells filler has a higher price. The recirculating aquaculture applications A system mode aquaculture effective the good in pond intensive mode. Microporous aeration eel recirculating aquaculture pool aerobics effect was significantly better than the paddlewheel aerator, operational safety, save energy, etc..}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}

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