Study on the technology of removal of nitrogen and phosphorus by magnesium ammonium phosphate process and it’s application – phd thesis – dissertation significado de anoxia

Abstract

The paper presents a high concentration of ammonia nitrogen wastewater and phosphate wastewater is treated with magnesium ammonium phosphate precipitation method based on optimization test, so that the effluent TP concentrations of 10mg / L, NH3-N content of about 50mg / L, and life nitrogen, phosphorus content of sewage close to dealing with water and sewage by mixing SBR biological treatment process to deal with mixed sewage to make it meet emissions standards. The paper discussed in detail the type of precipitating agent, ph value of wastewater, substance mole ratio, reaction time, reaction temperature, substance concentration, stirring speed, precipitating agent added, aging time factors such as the impact of both nitrogen and phosphorus removal.Significado de anoxia


of magnesium ammonium phosphate precipitation processing phosphates industrial wastewater, landfill leachate, phosphates industrial wastewater and landfill leachate wastewater. And to explore the feasibility of the effluent further processing of magnesium ammonium phosphate by SBR and its influencing factors. To study the mechanism of magnesium ammonium phosphate nitrogen and phosphorus removal technology. The thesis studies the content and conclusions are as follows: ① test, the main factors affecting the nitrogen and phosphorus removal of magnesium ammonium phosphate: 1) the type of precipitating agent: better precipitating agent for the treatment of high concentration of ammonia nitrogen wastewater: na2hpo4.12H2O mgcl2.6H2O and na2hpo4.12H2O mgso4.7H2O.Significado de anoxia better deal with the high concentration of phosphate wastewater precipitating agent: nh4cl mgcl2.6H2O and of nh4cl mgso4.7H2O. Better precipitating agent for processing at the same time containing high concentrations of ammonia nitrogen and phosphate wastewater the: mgcl2.6H2O and mgso4.7H2O. 2) ph value: ph = 8.5 1 0.0 range better while nitrogen and phosphorus removal, ph = 9.5 at the same time the nitrogen and phosphorus removal works best. 3) mg: P: N molar ratio: the wastewater ammonia and phosphate content is different, the best mg: P: N molar ratio. Processing PO 4 3 – -P content of 1700 1 800mg / L phosphate industrial wastewater optimal mg: P: N = 1.4:1.11:1.0 to deal with the content of NH3-N 2500 2 600mg / L of garbage leachate optimal mg: P: N = 1.3:1.15:1.0, comprehensive treatment of the phosphate industry wastewater and landfill leachate mg: P: N = 1.5:1.187:1.0. 4) the role of aging: the role of aging can significantly affect ammonia nitrogen and phosphate removal rate, when most of the sediment is generated magnesium ammonium phosphate, the aging time in about 24h to deal with the amount of residual ammonia nitrogen in water can be reduced by about 10%, the phosphate residual amount can be reduced by about 5%. 5) stirring speed: stirring speed is too low (less nitrogen and phosphorus removal: 50 r / min) or too high (such as: at 500 r / min) at the same time, the stirring speed of 200 r / min about the same time off the effect of nitrogen and phosphorus removal.Significado de anoxia better ② about 10mg / L, NH3-N content of about 50 mg / L, magnesium ammonium phosphate precipitation method to deal with different wastewater treated effluent TP test conditions: 1) the process PO 4 the content of the 3 – -P 1700 1 800 mg / L of phosphate industrial waste water, stirring speed of 200 r / min or so, the reaction time of 20 min, the ph = 9.5, mg: P: N = 1.4:1.11:1.0. The aging time of 30min, and the test conditions the PO 4 – -P removal efficiency of 98.69% processing effluent PO 4 3 – -P content was 9.16 mg / L, NH3-N content of 64.10mg / L. 2) handling NH3-N content of 2500 2 600mg / L of garbage leachate, stirring speed of 200 r / min or so, the reaction time of 20 min, ph = 9.5, mg: P: N = 1.3: 1.15:1.0.Significado de anoxia aging time of 30 min, and the test conditions, the removal rate of NH3-N was 97.05%, processing effluent NH3-N content of 75.86 mg / L, the PO 4 3 – -P content of 8.35mg / L. 3) 2500 integrated treatment of NH3-N content 2 600mg / L of garbage leachate and PO 4 3 – -P content of 1700 1 800 mg / L of phosphate industrial waste water, stirring speed of 200 r / min or so, the reaction time of 20 min, ph = 9.5, mg: P: N = 1.5:1.187:1.0. Aging time of 30min, and the test conditions the PO 4 3 – -P removal rate was 99.53%, NH3-N removal efficiency of 87.56%, the treated effluent PO 3 – -P content of 6.79 mg / L, NH3-N content of 76.12 mg / L,. Several wastewater obtained by X-ray diffraction spectra, and scanning electron microscopy characterization, handling most of the precipitate is a magnesium ammonium phosphate.Significado de anoxia the ③ trial showed that the conventional activated sludge after gradually increase the domestication of the salt content in the wastewater conductivity of about 15000μs/cm, the COD removal effects and nitrogen and phosphorus removal activated sludge still good. Magnesium ammonium phosphate precipitation process better test of the water used by SBR process operating conditions: 1) phosphate industrial wastewater treatment effluent and domestic sewage by volume mixed ratio of approximately 1:1 ratio, the electrical conductivity of the mixed sewage about for 15000μs/cm COD approximately 320.0mg / L, TN of about 50mg / L, TP approximately 7.0mg / L. Running period of 10h (which anaerobic 1.5h, aerobic 4.5h, hypoxia 2.5h, after oxygen consumption of 0.5h, precipitation drainage and idle 1.0h).Significado de anoxia the effluent TN smaller than the 15mg / L, TP less than 1.0mg / L, the COD of approximately 22mg / L, TN, TP, COD removal rate could reach 75%, 86%, 92% or so. 2) landfill leachate treatment effluent and sewage ratio of approximately 1:4 ratio by volume mixed the mixed sewage conductivity is about 15000μs/cm, COD to approximately 1150.0mg / L, TN is approximately 48mg / L, TP about 6.0mg / L. Run cycle for 12h (including anaerobic 2.0h aerobic 5.0h, hypoxia 3.5h, oxygen consumption after 0.5h, settling drainage and idle 1.0h). On the effluent TN less than 15 mg / L, less than 1.0mg / L, and COD is about 110mg / L, TN, TP, COD removal rate could reach 77%, 87%, 90%. 3) phosphate industrial wastewater and landfill leachate wastewater treatment effluent and domestic sewage by volume mixed ratio of approximately 1:1 ratio, the mixed sewage conductivity approximately 15000μs/cm COD approximately 630.0mg / L, TN about 51mg / L, and the TP about 6.0mg / L.Significado de anoxia running period of 10h (which anaerobic 1.5h, aerobic 4.5h, hypoxia 2.5h, after oxygen consumption of 0.5h, precipitation drainage and idle 1.0h). On effluent TN is less than 15 mg / L, less than 1.0mg / L, COD of approximately 45mg / L, TN, TP, COD removal rate could reach 78%, 88%, 93% or so. ④ kinetic trials studies show that at a ph = 9.5 hours, the total reaction system mainly occurs: of mg2 of NH4 HPO42-6H2O → mgnh4po4 · 6H2O ↓ H the reaction for the secondary reaction, the equilibrium constant for the kθ = 1.92, the rate constant for k = 3.75L.Mol -1 . S -1 , the activation energy ea = 14 02KJ.Mol -1 . Phosphate industrial wastewater and landfill leachate mixed sewage treatment effluent and sewage treatment in SBR, anaerobic stage COD removal kinetic equation: C t = C0 e -0.1888Xt ; phosphorus release kinetics of the anaerobic stage equation: the C pt = CP0 0 .0459 C0 (1-e -0.1888Xt ); aerobic stage COD removal kinetics the equation is: ct = C0 the e -0.0963Xt ; the aerobic segment phosphorus uptake kinetic equation: C pt = cp0 the e -0.1671Xt ; anoxic denitrifying phosphorus uptake kinetics equation: C pt = cp0 e -0.0773Xt .Significado de anoxia

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