本文關(guān)鍵詞： 城市污水處理 進水鹽度波動 運行調(diào)控 硝化液回流比 水量調(diào)節(jié)　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：我國南方沿海某城市污水廠原水直接取自感潮河道,漲潮時,越來越多的海水回流進入感潮河道,導致污水廠進水鹽度逐漸升高,而退潮時,與河道中污水混合的海水比例降低,污水廠進水鹽度逐漸降低。伴隨海洋潮汐變化,污水廠進水鹽度在短時間內(nèi)發(fā)生周期波動,對污水廠處理效果產(chǎn)生影響。目前,針對鹽度對污水處理效果的影響主要集中于原水中鹽度固定的條件下,而對原水中鹽度周期波動的研究尚未見相關(guān)報道。本文在對深圳市某存在進水鹽度波動的污水廠進行現(xiàn)狀調(diào)研的基礎(chǔ)上,結(jié)合實驗室小試試驗,考察了進水鹽度波動對污水處理效果的影響,并研究了對應的調(diào)控措施。調(diào)研發(fā)現(xiàn),全年進水鹽度波動受降雨影響較大,雨季4～9月進水鹽度波動范圍較小,為0%～2‰;而旱季1～3月和10～12月,進水鹽度波動范圍達0‰～8‰。同時,雨季和旱季水溫較高時,污染物去除效果較好,出水COD、NH_4~+-N和TN等均可達一級A排放標準;而旱季,因為鹽度波動范圍大、水溫相對較低,雖對COD仍有較好去除效果,但出水NH_4~+-N和TN存在超標現(xiàn)象。根據(jù)調(diào)研結(jié)果,發(fā)現(xiàn)進水鹽度波動和溫度對實際污水廠運行效果影響較大,但由于實際污水廠原水等其他因素波動較大,難以真正確定鹽度波動對處理效果的影響。因此,通過小試試驗,在其他因素一致的情況下,系統(tǒng)研究不同鹽度波動范圍和溫度對污水處理效果的影響。結(jié)果表明:在25±2℃和15±2℃下,鹽度波動范圍由0‰～2‰增大至0‰～10‰過程中,對COD去除均無明顯影響,但對NH_4~+-N和TN的去除效果均隨鹽度波動范圍增加而變差,并且,相同鹽度波動條件下,15±2℃下的NH_4~+-N和TN去除效果更差,當鹽度波動范圍在0‰～4‰以上時,出水水質(zhì)超過一級A排放標準。針對污水廠旱季進水溫度低、鹽度波動范圍大時出水存在超標現(xiàn)象,考察水廠前端增建調(diào)節(jié)池、調(diào)節(jié)硝化液回流比和水量季節(jié)調(diào)配三種方式對處理效果的影響。試驗結(jié)果表明:當進水鹽度的波動范圍為0‰～6‰時,前端增設(shè)0.3倍設(shè)計進水量的調(diào)節(jié)池或調(diào)節(jié)硝化液回流比為300%時,均能保證進水鹽度波動范圍控制在0‰～4‰,出水能達到一級A標準。對于水量季節(jié)調(diào)配方案,在雨季按1.3倍設(shè)計水量、旱季溫度較高時按正常水量、較低時按0.5倍設(shè)計水量運行,可保證在出水水質(zhì)達標的基礎(chǔ)上,保證處理水量達到或超過設(shè)計值。
[Abstract]:The raw water of a municipal wastewater treatment plant in the southern coastal area of China is taken directly from the tidal channel. When the tide rises, more and more sea water flows back into the tidal channel, which leads to a gradual increase in the salinity of the influent of the wastewater treatment plant and a decrease in the tide. The ratio of seawater mixed with sewage in river decreases, and the salinity of influent of wastewater treatment plant decreases gradually. With the change of ocean tide, the salinity of influent in wastewater treatment plant fluctuates periodically in a short period of time, which has an effect on the treatment effect of wastewater treatment plant. The effect of salinity on sewage treatment is mainly concentrated in the condition of fixed salinity in raw water. However, the study on the periodic fluctuation of salinity in raw water has not been reported. Based on the investigation of the current situation of a wastewater treatment plant with influent salinity fluctuation in Shenzhen, combined with the laboratory test, The effect of influent salinity fluctuation on sewage treatment effect was investigated, and the corresponding control measures were studied. It was found that the influent salinity fluctuation was greatly affected by rainfall in the whole year, and the fluctuation range of influent salinity from 4 to September in the rainy season was small, which was 0 ~ 2 鈥，

本文編號：1550913