Denitrification and nitrogen recovery method for nitrification-type biofloc aquaculture wastewater
A biological flocculation and aquaculture technology, applied in chemical instruments and methods, animal husbandry wastewater treatment, water/sludge/sewage treatment, etc. Conducive to environmental protection and the effect of saving natural resources
Inactive Publication Date: 2020-07-14
SHANGHAI OCEAN UNIV
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Problems solved by technology
Biological denitrification reactors have been widely studied and applied as a type of professional water treatment equipment, but dedicated biological denitrification reactors undoubtedly increase the fixed investment costs and operational management difficulties of aquaculture enterprises
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Embodiment 1
[0023] Using nitrification-type biofloc technology to culture tilapia in freshwater for 116 days, after catching tilapia, the biofloc concentration (total suspended solids, TSS) obtained was 913.3g / m 3 , The concentration of nitrate nitrogen is 268.9g / m 3 of initial aquaculture wastewater. followed by figure 1 The method steps of natural precipitation, water body transfer, dosing of carbon source, denitrification treatment, and recovery of flocs are shown to perform denitrification treatment and nitrogen recovery on the initial aquaculture wastewater, and the specific operations are as follows:
[0024] (1) Natural sedimentation: Use a water pump to transfer the initial aquaculture wastewater to a circular water tank with an inner diameter of 1.5m, without aeration, oxygenation and / or stirring equipment, and leave it for 1 hour to obtain a supernatant.
[0025] (2) Water body transfer: Use three circular buckets with an inner diameter of 0.45m, and transfer 0.06m into each b...
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The invention belongs to the field of aquaculture, and particularly relates to a denitrification and nitrogen recovery method for nitrification type biofloc aquaculture wastewater, which comprises thefollowing steps: removing naturally precipitated biofloc in the aquaculture wastewater to obtain aquaculture wastewater with residual biofloc, wherein the aquaculture wastewater contains nitrate nitrogen; adding a carbon source into the aquaculture wastewater with the residual biofloc, keeping a turbid state or a standing state, carrying out denitrification nitrogen removal treatment, and proliferating the residual biofloc so as to obtain denitrified water with proliferated residual biofloc; and separating proliferated residual biofloc in the denitrified water. According to the method, a special biological denitrification reactor is not needed; inorganic nitrogen can be subjected to denitrification treatment by adding an exogenous carbon source, the inorganic nitrogen is assimilated intoan organic component of proliferation flocs, partial recovery of inorganic nitrogen such as nitrate nitrogen is realized, the requirements on equipment and environment are low, the operation is simpleand convenient, the control is easy, special pretreatment and / or earlier-stage culture are / is not needed, the benefit is high, and the cost is low.
Description
technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a method for denitrification and nitrogen recovery of nitrifying biofloc aquaculture wastewater. Background technique [0002] Environmental issues and limited natural resources place higher demands on aquaculture technology and water treatment technology. Biofloc Technology (BFT) is based on the addition of a large amount of additional carbon sources, which regulates pollutants in aquaculture and recycles and reuses nutrients (such as nitrogen) through assimilation. In the BFT aquaculture water, a large number of suspended bioflocs, under the promotion of a large amount of carbon sources, assimilate and recycle the ammonia nitrogen in the aquaculture environment, and convert it into the biomass of the microorganism itself, which can be filtered by the aquaculture animals. be reused. Studies have also shown that the collected bioflocs can be used as raw materials for aqua...
Claims
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IPC IPC(8): C02F3/28C02F103/20C02F101/16
CPCC02F3/28C02F2101/16C02F2103/20
Inventor 谭洪新刘文畅罗国芝孙大川扶泽发付贤茂
Owner SHANGHAI OCEAN UNIV