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High efficiency and energy saving nitrogen and phosphorus removal technology for organic wastewater
Taking slaughter wastewater as an example, the wastewater is characterized by high organic matter, high ammonia nitrogen and total nitrogen。In the case of suitable C/N ratio, the removal of total nitrogen requires a large amount of nitrification reflux。The traditional AAO nitrogen and phosphorus removal process requires a high-power sewage pump to return the nitrification solution to the anoxic pool to complete the denitrification effect. In view of this phenomenon, the company's technical research and development personnel will improve the AAO process, and the improved process has a better nitrogen and phosphorus removal effect, and the water output can be stable to the standard。And it can save at least 1/3 of the power consumption of the biochemical part, which is reflected in:
(1) According to the calculation of nitrogen removal efficiency, when the external reflux (that is, the sludge reflux) is 100%, the internal reflux (that is, the nitrification reflux) is at least 600%。In actual operation, sludge reflux is controlled at 100%, nitrification reflux (secondary O pool to primary A pool) is controlled at 200%, and effluent ammonia nitrogen can reach the standard。
(2) The aerobic tank is a push flow, and the oxygen demand shows a decreasing trend with the reduction of organic matter. In the design of the aeration system, the aeration capacity of the aerobic tank is carried out according to the gradient from more to less。In this way, the air volume of the fan can be fully utilized and the unnecessary air volume loss can be minimized。This phase can save about 1/6 air volume。