te]Bio Return activated sludge Return activated siu TEnant Aerobic Eluent profluent (A Nitrox Heun actvasnd Eue h↓ 婉 idaion ach operon swithed from a aerobic to an gnomic operoting oondition by ting off the aeration and micer to mointain channel velocity. The pre depends on the use of oxidotion-reducion potential (ORP)oontrol n delermine when the nitrone is depleted during the anoxic operation and (2)restart aeration at selected times, the orators are tumed off and the miver is bumed on. when the nitrate is depleted in the oration OFF ORP drops dromoticoly. The ORP data is interpreted by a PC hich starts the aeration. a typical operating condition for the NitroxTM ocess is t hum the aerators off at last twice per day, usually in the moming when the lod is increasing and then in the eardy evening hours STensen and Coleman, 2000 ) The off time for the nitra oletion usually lasts 3 to 5 h depending on the plant lood and amount of nitrate in oxidation ditch. Efluent NO-N concentrations of less than 8 me/L and H-N 10k1.5 16
16
Bardenpho生物脱工艺 设立两个缺氧段,第一段利用原水中的有机物为碳 源和第一好氧池中回流的含有硝态氪的混合液进行 反硝化反应。 为进一步提高脱氮效率,废水进入第二段反硝化反 应器,利用内源呼吸碳源进行反硝化。 曝气池用于吹脱废水中的氮气,提高污泥的沉降性 能,防止在三沉池发生污泥上浮现象。 原污水(qv) 沉淀池处理水(qy) 缺氧池1好氧池1缺氧池2好氧池2 剩余污泥 污泥回流(0.50v) 图18-5 Bardenpho脱氮法流程 17
17 Bardenpho生物脱氮工艺 设立两个缺氧段，第一段利用原水中的有机物为碳 源和第一好氧池中回流的含有硝态氮的混合液进行 反硝化反应。 为进一步提高脱氮效率，废水进入第二段反硝化反 应器，利用内源呼吸碳源进行反硝化。 曝气池用于吹脱废水中的氮气，提高污泥的沉降性 能，防止在二沉池发生污泥上浮现象
「i - 后置反硝化工艺 Postanoxic Intent Aerobic b Avene In the single-sludge process (developed by Wuhrmann),nitro was oco lished in the activaled -sludge process by odding a mixed anoxic tank ofter aerobic nitrification. To achieve high nitrate-removal efficiency, a long detention time is required in the postanoxic tank
18 c. 后置反硝化工艺
t Oxidation ditch Retum swiveled sudo Depending on the aeration design and length of the oxidation ditch channel, anoxic denitrification zones can be established in oxidation ditches lo accomplish biological nitrogen removal in a single tank. an aerobic zone exists after the aerator, and as the mixed liquor rows dow the channel away from the aerator, the do concentration decreases due lo oxygen uptake by the biomass. At a point where the Do is depleted I an anoxic zone is created in the ditch channel and the nitrate will be used for endogenous respiration activity by the mixed liquor. Most of the BOd had been consumed previously in the aerobic zone.Because of the large tank volumes and long SRTs used in oxidation ditch processes, sufficient opacity is available to accommodate nitrification and denitrification zones. do control is neces to maintain a sufficient anoxic zone volume to allow for significant An approach that was most popular in the 1970s and is o s extemal carbon ethanol. The activated-sludge anoxic zone(1 to 3 h) is mixed and a short aeration time( <30 minl follows to strip nitrogen gas bubbles from the Roc and to provide aerobic oonditions to improve solids separaton in the darifer Methanol is a commonly use ther substates for enitrifiootion in terms of oost per unit of nitrate removed though its ield The lower igher ratio of nitrate used per g of substrate provided. typical ratosofo Id means that o gr methanol to nitrate removal are 3.0 bo 4.0 g/g depending on the amount of do in the infuent wastewater and the anoxic system SRT. Longer SRT ve greater amounts of biomass oxidized by end nitrate ratio con be lower. The use of methanol requires special storage and monioring precautions as it is a flammable substance. Because le, other substrates, such as acetate ho considered. Ached growth denitrification reactors with methanol addon bcanaobte n sed or poxonoasic nihon nmovd se
19
Sharon脱氪技术 荷兰 Delft大学发明,利用厌氧氨氧化和中温正硝化技术 厌氧氨氧化( ANAMMOX: Anaerobic AMMonium OXidation)指在厌氧或缺氧条件下,氨氮以狂硝酸盐氪 作为电子受体直接被氧化到氦气的过程 NH4+NO2 N2+2H2O 中温亚硝化( SHARON: Single reactor for High Ammoniun Removal Over Nitrite)是利用了温度高有利于正硝化细菌 增殖这一特点,使硝化菌失去竞争。 ANAMMOX工艺要和 SHARON工艺结合使用。 Sharon脱氮技术 Nitrogon removal from digested sludge processing recycle flows (m)Sharon(single-readtor high-activity ammonia removal over nitrie) taung anode porod) octivalad-oudoe doctor 进水 SHARON ANAMMOX 出水
20 Sharon脱氮技术 荷兰Delft大学发明，利用厌氧氨氧化和中温亚硝化技术： 厌氧氨氧化（ANAMMOX:Anaerobic AMMonium OXidation）指在厌氧或缺氧条件下，氨氮以亚硝酸盐氮 作为电子受体直接被氧化到氮气的过程： NH4 ++NO2 - N2+2H2O 中温亚硝化（SHARON: Single reactor for High Ammonium Removal Over Nitrite）是利用了温度高有利于亚硝化细菌 增殖这一特点，使硝化菌失去竞争。 ANAMMOX工艺要和SHARON工艺结合使用。 Sharon脱氮技术 进水 SHARON ANAMMOX 出水