XU Zhi qiang,LI Yao,ZHOU Ai chao,et al.Phosphate Release and Influencing Factors Analysis during Sludge Thermal Hydrolysis[J].China Water & Wastewater,2018,34(21):24-30.
污泥熱水解過(guò)程中磷的釋放規(guī)律與影響因素
- Title:
- Phosphate Release and Influencing Factors Analysis during Sludge Thermal Hydrolysis
- 文章編號(hào):
- 1000-4602(2018)21-0024-07
- 分類號(hào):
- TU992
- 文獻(xiàn)標(biāo)志碼:
- A
- 摘要:
- 剩余污泥中富含磷物質(zhì)，具有較大的回收利用價(jià)值。從污泥中高效回收磷最重要的步驟是將磷盡可能地釋放到溶液中。以含固率為5%的剩余污泥（干污泥中磷占比為1.1%）為研究對(duì)象，進(jìn)行了熱水解磷釋放規(guī)律研究。結(jié)果顯示：當(dāng)采用低溫水解與投加酸聯(lián)合處理剩余污泥時(shí)，污泥絮體被破壞，磷的釋放量顯著增加。當(dāng)溫度為75 ℃、加熱時(shí)間為1 h、pH值為3時(shí)，TP和IP的釋放量可達(dá)到最大，分別為311.9 mg/L和293.8 mg/L，是原污泥液相中TP和IP含量的7.9倍和8.4倍。將經(jīng)上述條件處理的污泥混合液在35 ℃下靜置24 h，污泥液相中NH+4-N濃度由96.0 mg/L提高到318.7 mg/L，同時(shí)伴隨著SCOD濃度的明顯減小。因此，通過(guò)低溫短時(shí)熱水解聯(lián)合酸處理可顯著提高污泥中磷和氨氮的釋放量，可為后續(xù)以鳥(niǎo)糞石沉淀法回收磷創(chuàng)造有利條件。
- Abstract:
- The phosphorus (P) in excess sludge (ES) produced by the sewage treatment plant has huge recycling value. The most important step of P recovery from the ES is to release as much P as possible into the solution. In this work, the ES with a solid content of 5% was used to study P release during the thermal hydrolysis. The results showed that when the ES was treated with low?temperature and pretreated with acid, the floc of the sludge was destroyed, and the release of P increased significantly. When the temperature was 75 ℃ for 1 h, the release of the total P (TP)and dissolving inorganic P (IP) in the liquid phase of raw sludge reached the maximum level, 311.9 mg/L and 293.8 mg/L, respectively, and was increased by 7.9 times and 8.4 times compared with raw sludge. When the sludge mixture was allowed to stand for 24 h at 35 ℃, the concentration of ammonia nitrogen (NH+4-N) increased from 96.0 mg/L to 318.7 mg/L, accompanied by a significant decrease in the concentration of soluble chemical oxygen demand (SCOD).These results demonstrated that the combination of low?temperature and short?time thermal and acid pretreatment could significantly increase the P and NH+4-N release in the sludge, which created favorable conditions for P recovery by struvite precipitation.
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備注/Memo
基金項(xiàng)目：陜西省教育廳重點(diǎn)項(xiàng)目（17JS103）作者簡(jiǎn)介：徐志嬙（1969- ），女，重慶人，博士，教授，主要從事污水再生利用與水生態(tài)修復(fù)技術(shù)研究。
E-mail:595269472@qq.com
收稿日期：2018-06-05
來(lái)源： http://zggsps.paperonce.org/oa/DArticle.aspx?type=view&id=201821005
