• 关键词：剩余污泥  厌氧系统  铁源  磷回收  蓝铁石

• 基金项目：省部共建西北旱区生态水利国家重点实验室基金资助项目（No.2016ZZKT-8）；水利水电学院国家级实验教学示范中心项目（No.WRHE1709）

• 胡德秀
• 西安理工大学省部共建西北旱区生态水利国家重点实验室，西安 710048

• 闫怡心
• 西安理工大学省部共建西北旱区生态水利国家重点实验室，西安 710048

• 李瑶
• 西安理工大学省部共建西北旱区生态水利国家重点实验室，西安 710048

• 朱念
• 西安理工大学省部共建西北旱区生态水利国家重点实验室，西安 710048

• 张聪
• 西安理工大学省部共建西北旱区生态水利国家重点实验室，西安 710048

• 摘要：以污水处理厂剩余污泥为研究对象，污泥经酸/碱预处理（pH=3.0/pH=10.0）后，分别以FeOOH、FeCl₃及Fe₂O₃为外加铁源，进行厌氧发酵，探究铁源对厌氧系统中蓝铁石晶体生成的影响.结果表明：FeCl₃和FeOOH可以高效地被还原为Fe²⁺，其铁还原效率（E_Fe）最高为56.24%~80.10%，且酸处理效果优于碱处理（3.00%~13.31%），而Fe₂O₃的E_Fe相对较低，最高分别为31.94%（pH=3.0）和50.1%（pH=10.0）.FeOOH和Fe₂O₃的投加，可促进胞外聚合物（EPS）中蛋白质含量的提升，增强胞外电子传递能力，但Fe₂O₃因其结晶度高，阻碍了铁还原微生物对铁源的利用，导致铁还原效率低.上清液PO₄^3-浓度、污泥Fe-P比例与E_Fe呈负相关，E_Fe越高则PO₄^3-浓度、Fe-P比例越低.FeOOH组上清液PO₄^3-浓度下降幅度最大，反应第9 d PO₄^3-浓度最低，仅为对照组的10.30%（pH=3.0）和17.20%（pH=10.0），其次是FeCl₃组（22.83%/27.87%），Fe₂O₃组最终剩余较多PO₄^3-（65.02%/56.33%）；FeOOH、FeCl₃和Fe₂O₃酸/碱组的Fe-P比例分别为32.19%/21.20%、34.41%/23.09%和20.92%/11.99%.铁源的添加提高了污泥的磷回收率（R_p），并且酸预处理效果优于碱处理，其中FeCl₃组R_p最高，是对照组的2.91倍，其次是FeOOH组（2.63倍）和Fe₂O₃组（2.12倍）.XRD分析表明，FeOOH和FeCl₃酸/碱预处理组均生成了蓝铁石晶体.

• Abstract：In oder to investigate the effects of external irons on vivinaite formation during anaerobic fermentation （AF）， the waste activated sludge （WAS） from wastewater treatment plant was selected as a sample. After performing acid/alkali pretreatment （pH=3.0/pH=10.0） on WAS， FeOOH， FeCl₃ and Fe₂O₃ were added as external irons， respectively. The results indicated that FeCl₃ and FeOOH can be reduced to Fe²⁺ efficiently and the maxium iron reduction efficiency（E_Fe） ranged from 56.24% to 80.1%. Furthermore， E_Fe of acid treatment groups was 3.00%~13.31% higher than that of alkali treatment. The E_Fe of Fe₂O₃ was 31.94% （pH=3.0） and 50.10% （pH=10.0）. The addition of FeOOH and Fe₂O₃ promoted the increase of protein in the extracellular polymeric substances （EPS） of WAS during AF， which enhanced the ability of extracellular electron transfer. However， the degree of iron reduction of Fe₂O₃ group is weak， because its high crystallinity prevented iron-reducing bacteria from utilizing iron. The concentration of PO₄^3- in supernatant and the ratio of Fe-P in WAS was negatively correlated with E_Fe. The higher the E_Fe， the lower the concentration of PO₄^3- and the ratio of Fe-P. The concentration of PO₄^3- in the supernatant of FeOOH group decreased and reached the minimum on 9th day， accounting for 10.30%（pH=3.0） and 17.20%（pH=10.0） of control group， followed by FeCl₃ （22.83%/27.87%） and Fe₂O₃ groups（65.02%/56.33%）. The ratios of Fe-P of FeOOH， FeCl₃ and Fe₂O₃ （acid/alkali pretreatment） groups were 32.19%/21.20%， 34.41%/23.09% and 20.92%/11.99%， respectively. The addition of iron increased the phosphorus recovery rate （R_p） of WAS， and the efficiency of acid pretreatment was better than that of alkali treatment. The R_p of FeCl₃ with acid pretreatment group was the highest， which was 2.91 times that of control group， followed by FeOOH （2.63 times） and Fe₂O₃ groups （2.12 times）. The results of XRD analysis showed that both FeOOH and FeCl₃ with acid/alkali pretreatment groups produced vivianite crystals.

• Key words：waste activated sludge  anaerobic fermentation  external iron  phosphorus recovery  vivianite

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