The Study On Wastewater Of Coke And Chemical Industry Biological Nitrogen Removal By Shortcut Nitrification-Denitrification

Nitrogen is the one of the most important elements in the world. But if the organic nitrogen and istmmonia nitrogen flow into the river, the river will be polluted seriously, for example excess nourishment phenomenon. With the development of the environmental industry, the regulation of wastewater discharge are getting more and more strict, and the technology of biological nitrogen removal is one of most concerns.At the first the thesis introduce some general technologies of nitrogen removal, for example physical and chemical technology of nitrogen removal, including ammonia removal method by blowingx breakpoint chlorination Jon exchange method;and traditional technology^ biology nitrogen removal, including traditional technology of alive sludge and biolodical stabilization ponds technology; especially the technology og biological nitrogen removal which is cared about in great area, including the bardenpho technology of biological nitrogen removal, the A/0technology og biological nitrogen removal and the technology of biological nitrogen remove! by shortcut nitrification-denitrification.According to the experience from actual project, the thesis analyses the shortcoming of the traditional biological nitrogen removal technology in treating high ammonia nitrogen wastewater. And presents the advance technology and principles of biological nitrogen removal by shortcut nitrification-dinitrification.This technology's ultimate elements are: In one reactor container at first there is a reactor from ammonia to NO2- at the oxygen condition and then there is a reactor from NO2-to N2at lake oxygen condition. Through the compare of A/0 technology of biological nitrogen removal and the technology of shortcut nitrification-denitrification educe the excellence and engineering value of the second technology:(1) This technology can reactor in one container. Itcan predigest technological process; (2)This technology can shorten waterpower settle time and make reactor container cubage andarea more little. It also ecoraomize carbon source about 40 percent; (3)This technology can shorten 25 percent oxygensource in nitrification phase; (4)This technology can shorten reactor time and 30 percent to 40 percent subage of reactor container; (5)This technology has more high velocity ofdenitrification;(6)Corrupt can shorten sludge production; (7)This technology can shorten about 50 percentalkali quantity.So this project adopt the technology of biological nitrogen removal by shortcut nitrification-denitrification. The; key is controlling the reactor rest on NO2- phase farthest. The thesis detailedly introduce the method through controlling diffluence oxygen, pH, temperature, FA, alkali quantity, HRT etc. which can realize the technology in this project. The control parameter as the following:┌────────────────┬──────────┐│Nitrificatlon)ool │Denitrificatlon pool│├─────┬─────┬────┼─────┬────┤│pH │DO │ Alkali│PH │DO ││ │ │quantity│ │ │├─────┼─────┼────┼─────┼────┤│7．2～8．5│0．5～2．0│150～500│7．0～8．0│0～1．0 │└─────┴─────┴────┴─────┴────┘...