|
The swine wastewater mainly include livestock manure and flush the waste water with high ammonia, high concentration of organic matter, suspended solids and other characteristics. In many areas, the swine wastewater have been or are to become a greater source of pollution than industrial wastewater and domestic sewage. The authors carried out the research and analysis of the existing process of the pig farm, discovered how to remove the high concentration of ammonia nitrogen in the wastewater to meet emission standards, has been facing problems in swine wastewater treatment. Nitrosated - anaerobic ammonia oxidation process is a new type of biological nitrogen removal process, its significant advantages of wide attention, the process involves two steps. First Ammonia is oxidized at a low dissolved oxygen under conditions into nitrite nitrogen product Nitrite with ammonia, and then under anaerobic conditions to the proportion of reaction proximity versa directly generate a small amount of gaseous nitrogen and nitrate nitrogen, so as to achieve biological denitrification purposes. In this thesis, the raw water using anaerobic digestion of swine wastewater expedition the swine wastewater nitrosated to match subsequent anaerobic ammonia oxidation, test a conventional activated sludge as seed sludge was successfully cultured to nitrite bacteria mainly based on activated sludge through the regulation of SBR system the pH, DO, ammonia load, organic load, temperature and other operating parameters, find can match anammox nitrosated optimum operating parameters of the process and its mechanism of Microbiology, total nitrogen loss during the course of the reaction substrate conversion laws are discussed. Experimental results show that: (1) Firstly nitrosated reactor treating swine wastewater start. The tests showed that: at a temperature of 32 ° C and the starting pH of 8.2 ~~ 8.5, by adjusting the aeration time and the amount of aeration, and gradually increase the load to the raw water, after more than two months of sludge acclimation culture, successful accumulation of nitrite in the reactor bacteria. (2) determine the best running way of handling livestock pig wastewater nitrification reactor. The tests showed that: aeration time in the reactor will be controlled at 23h, either the high concentration of organic matter in the wastewater to achieve high removal rate and make the water NH - -N and NO 2 - ratio is about 1:1.32. Meet the influent of the anaerobic ammonia oxidation reactor. (3) the optimal operation mode, temperature, pH, organic matter, free ammonia, dissolved oxygen nitrosation and determine the best control range of the various factors. The tests showed that: the nitrosated reactor, the temperature in the range of 20 ℃ to 32 ℃, pH 8 to 8.2, the vote plus NaHO 3 50g, the amount of aeration from 0.2m 3 / h, the effluent can meet the water requirements of the anammox. When the influent COD, NH 4 -N concentration control 1800mg / L and 1400mg / L increased influent load should be appropriate to increase the reactor exposure Volumes and aeration time, does not require the DO maintained at a low range (<1mg / L). (4) to study the conversion law for each indicator and stable operation under optimized conditions, tests showed that: stable operation, the ammonia concentration with the passage of time gradually reduce nitrite nitrogen concentration over time gradually increased, the conversion of the two rate are first slowly and then speed up again after reducing nitrate nitrogen concentration in the whole process has been low: pH increased slightly within the first 30 min of aeration, the rest periods are declining in the whole process: DO uptrend. Ammonia degradation process to follow first-order kinetics, the degradation rate constants for 19.11L / h. The nitrosation of total nitrogen loss (5) tests showed that aeration stripping, denitrification, microbial endogenous respiration so that the total nitrogen reduction.
|