| 摘要 |
PURPOSE: An advanced biological treatment system of sewage is provided, which can produce organic acid 780mg per liter for 8-10 hours of reaction, remove phosphorus by 90% as total, can nitrify by 95% at the primary nitrification tank(14-2) and by almost 100% at the secondary nitrification tank (14-4) and can denitrify by 78% at the primary denitrification tank(14-1) and by 90% at the secondary denitrification tank(14-3). The system do not need any carbon source by using organic acid as the source. CONSTITUTION: The system comprises the followings: (i) a primary treatment process(10) that consists of two chemical tanks(10-1,10-2), a sump tank(11) for collecting and agitating by agitating blade, a cohesion tank(12-1) for cohesion of sewage, a coagulation tank(12-2) for coagulating by coagulating adjuvant and a primary settling tank(13-1) for settling sewage of low COD; (ii) a secondary treatment process(20) that consists of a fermentation tank(15-1) for fermenting the sludge of the primary settling tank(13-1) to a suitable BOD, a concentration separation tank(15-3) for discharging volatile organic acid and sludge and a storage tank(15-2) for storing organic acid of the separation tank(15-3); and (iii) a tertiary treatment process(30) that consists of a primary denitrification tank(14-1), a primary nitrification tank(14-2), a secondary denitrification tank(14-3), a secondary nitrification tank(14-4) for removing nitrogen in sewage and a blower(14-5).
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