Study On The Treatment Of Aquaculture Wastewater By SBR And SBBR Reactors

Aquaculture wastewater is a common pollutant, large emissions have seriousdamage to the coastal waters, aquaculture and ecological system. After theaquaculture wastewater discharged into natural water which can lead to the elevatedof nutrient levels, causing trigger red tides and algal blooms. It also damage to theaquatic species diversity, causing water quality deterioration, the toxic and harmfulbacteria in water blooms. Antibiotics and other pollutants contained in wastewater andaquaculture in organisms accumulation, and eventually enter the human body anddirect risks to human health.This paper systematically analyzes the harm and the nature of aquaculturewastewater. Describes the current method of handling a variety of domesticaquaculture wastewater. Studied the sequencing batch reactor (SBR) and sequencingbatch biofilm reactor (SBBR) treatment of aquaculture wastewater. With aerobic-anoxic (O/A) and an anoxic-aerobic (A/O) respectively mode of SBR reactor andSBBR reactor. By adjusting the aerobic time and anoxic time can optimal operationconditions of aquaculture wastewater treatment. Analysis the changes of activatedsludge reactor activity index in SBR and SBBR with different aerobic anoxiccondition, and the extracellular polymer components and microbial communitystructure changes. The results show that better removal effect can be achieved withthe A/O reactor. When the operating conditions of anoxic9h and aerobic1h SBR andSBBR aerobic reactor effluent effects are best, the removal rate of COD, NH4+-N,NO2--N, NO3--N, are98.4%,92.5%,85%and36.5%, respectively. In the SBR. Theremoval rate of COD, NH4+-N, NO2--N, NO3--N, are98%,92.5%,88%and70%,respectively. in the SBBR. recirculating aquaculture system to meet the requirementsof the biological treatment process links, smaller destroy toxic to aquatic organismsand the environment. Compared to SBBR reactor, SBR reactor microbial nitrificationrate is slightly higher, but activated sludge denitrification rate higher in SBBR reactor, which can obtain the better denitrification effect. Changes in aerobic activity indicatorfor hypoxia microorganisms may produce a certain effect while the effect is notparticularly conspicuous. The extracellular polymer component and content can bechanged by aerobic and anoxic time. Prolonged aerobic time make microbialextracellular polymers (PN) proteins and polysaccharides (PS) content increased. Theuse of three-dimensional Fourier transform infrared spectroscopy and fluorescencespectra of LB-EPS and TB-EPS detects changes in hypoxic conditions drawn aerobicintensity infrared spectrum will lead to changes in the protein peak. Use DGGEtechnique to analyze microbial diversity settlements showed that the microbial speciesare more abundant in SBBR reactor.This paper studied the oxytetracycline which was widely found in aquaculturewastewater in appropriate operating conditions. Through improving the terramycinconcentration in the simulation wastewater, the effectiveness of SBR and SBBR canbe investigated. The COD removal rate of SBR system dropped by40%whenoxytetracycline concentrations up to12mg/L from0mg/L, ammonia removalefficiency decreased by about75%and the nitrate removal a decrease ofapproximately25%. The COD removal of SBBR also decreased by about30%,ammonia removal efficiency decreased by about50%. The experimental resultsshowed that oxytetracycline had toxic effects on organisms, while SBBR reactor has abetter ability to withstand external toxic stimuli.The effect of oxytetracycline concentration on the activity of microorganismindex system was determined in this paper, and the results further confirmed thetoxicity of oxytetracycline. Analysis of the activated sludge extracellular polymer, theresults showed that activated sludge will secrete more EPS to protect themselves fromthe outside world poisoned when the concentration of microorganisms increased.Analysis the C, N, O of EPS by XPS spectrum technique, the effects ofoxytetracycline for suspended sludge in SBBR system is more obvious. The microbialcommunity structure showed that the microbial community structure changed whenoxytetracycline concentration, while the microbial diversity index decreased.