Study On Treatment Of High Concentration Of Swine Wastewater By Enhanced Coagulation-MAP Percipitation-fenton Oxidation

In recent years, with the development of livestock industry. Waste water discharge is concentrated. This wastewater discharge, high concentrations of organic matter, high ammonia concentrations. However, aquaculture meager cost, waste water is discharged without treatment depth. Discharge water quality is not up to standard. This phenomenon has resulted in breeding areas surrounding environment is severely polluted. In this paper,using enhanced coagulation- precipitation of Magnesium Ammonium Phosphate(MAP)-Fenton oxidation technology to handle high concentrations of swine wastewater.Investigation Process for swine wastewater treatment effect of high concentration and to explore the optimal reaction conditions. Experimental results show that:(1)Using six kinds of flocculants: Al2(SO4)3, crystallized AlCl3, polymeric Al2(SO4)3,polymerized AlCl3(PAC), polyacrylamide(PAM), chitosan(CTS) respectively treates swine wastewater. The results showed that the inorganic flocculants PAC treating wastewater pollutant degradation rate is better, organic flocculants chitosan treating waste water flocculation effect is more significant. Using PAC-CTS composite flocculant in swine wastewater treatment was better than the effect of inorganic flocculants PAC and an organic polymer flocculants chitosan(CTS) alone treated swine wastewater. Enhanced Coagulation range analysis of orthogonal experiments found that the pH of the wastewater, PAC dosage and CTS dosage three factors that affect water turbidity, varying degrees of CODcr, NH3-N and TP removal rate. While, optimal conditions are different. For water turbidity was 11500 degrees, CODcr was 18370 mg / L, NH3-N was 2116 mg / L and TP was 278 mg / L wastewater. Adjusting the pH of the wastewater is 6, 50 g / L PAC dosage was 4 mL, 5 g / L CTS dosage was 21 mL, turbidity, CODcr, NH3-N and TP removal rate reached 94.35%,85.30%, 65.50% and 75.90%, then the turbidity is 650 degrees, CODcr was 2700 mg / L,NH3-N was 730 mg / L, TP is 67 mg / L.(2)MAP precipitation treats swine wastewater after strengthening coagulation with good results. In the experiment, wastewater not only can increase ammonia removal, but also can reduce total phosphorus concentration while adding phosphate and magnesium. By the orthogonal experiment results that range analysis, pH value of the reaction, n(P): n(N)molar ratio, n(Mg): n(N) molar ratio of the three factors affecting nitrogen and total phosphorus removal in wastewater different levels of rates. Adjusting the pH of the wastewater is 10, n(P): n(N) molar ratio is 1.1, n(Mg): n(N) molar ratio is 1.3, NH3-N and TP removal rate reached 72.89% and 79.87%. In this case the effluent NH3-N is 198 mg / L,TP is 13 mg / L.(3)Fenton reagent can be effectively degraded by MAP precipitation treatment of swine wastewater pollutants. PH value, FeSO4 dosage, H2O2 dosage and reaction time will affect the wastewater CODcr removal. When the wastewater pH = 3.5, dosage of FeSO4 was 5 mmol·L-1, the dosage of H2O2 was 40 mmol·L-1, to control the reaction time 45 min.The experiment to get the best removal rate of CODcr. Following the enhanced coagulation sedimentation process and MAP precipitation process and then by Fenton oxidation process,the maximum removal CODcr was 50.07%. CODcr effluent is 1072 mg / L.Composite coagulation sedimentation- MAP precipitation- Fenton oxidation process for the total CODcr removal rate reached 94.16%, NH3-N removal rate reached 93.05%, TP removal efficiency of 96.76%. This process can reduce the pollution load for further biological treatment.