温度对超磁分离初沉污泥水解酸化的影响
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摘要
以超磁分离后初沉污泥作为研究对象,在维持初始pH在7.4～7.8的条件下,分别控制温度在20、25、30和35℃,探究温度对超磁分离初沉污泥厌氧水解酸化产物及产率的影响。结果表明,温度的升高加速了超磁分离初沉污泥的水解酸化。35℃时,SCOD在第3天即达到峰值970.32 mg·L~(-1),VFAs也达到峰值295.9 mg·L~(-1),此时,VFAs中含量最高的为乙酸217.1 mg·L~(-1),乙酸占比为73.3%;而25℃时,其占比为68%。超磁分离初沉污泥水解酸化获取内碳源的同时还伴随着N元素的释放,且温度越高,TN和NH_4~+-N的释放越明显。由于系统中聚合氯化铝((Al_2(OH)_nCl_(6-n))_m,PAC)的存在,所以并没有P元素的释放。在30℃的反应温度下,超磁分离初沉污泥水解酸化即可以获取更多的碳源,又可以避免产生过高的N、P负荷。
In this study, the effects of temperatures at 20, 25, 30 and 35 ℃ on anaerobic hydrolysis acidification products and productivity of ReCoMag separated primary sludge were investigated. The results showed that the increase of temperature accelerated the hydrolysis and acidification of the ReCoMag separated primary sludge. At 35 ℃, SCOD and VFAs reached their own peak values of 970.32 mg·L~(-1) and 295.9 mg·L~(-1) on the 3 rd day of anaerobic hydrolysis acidification process, respectively, and acetic acid in VFAs showed the highest content of 217.1 mg·L~(-1) and its ratio was 73.3%, while its ratio was 68% at 25 ℃. In addition, the release of N element occurred as autochthonous carbon was obtained from anaerobic hydrolysis acidification of ReCoMag separated primary sludge, and TN and ammonia nitrogen release were more significant at higher temperature. The polymerized aluminum chloride((Al_2(OH)_nCl_(6-n))_m, PAC) in the system resulted in no P element release. At 30 ℃, the anaerobic hydrolysis acidification of ReCoMag separated primary sludge could obtain more carbon sources, and avoid excessive yields of N and P loads.
In this study, the effects of temperatures at 20, 25, 30 and 35 ℃ on anaerobic hydrolysis acidification products and productivity of ReCoMag separated primary sludge were investigated. The results showed that the increase of temperature accelerated the hydrolysis and acidification of the ReCoMag separated primary sludge. At 35 ℃, SCOD and VFAs reached their own peak values of 970.32 mg·L~(-1) and 295.9 mg·L~(-1) on the 3 rd day of anaerobic hydrolysis acidification process, respectively, and acetic acid in VFAs showed the highest content of 217.1 mg·L~(-1) and its ratio was 73.3%, while its ratio was 68% at 25 ℃. In addition, the release of N element occurred as autochthonous carbon was obtained from anaerobic hydrolysis acidification of ReCoMag separated primary sludge, and TN and ammonia nitrogen release were more significant at higher temperature. The polymerized aluminum chloride((Al_2(OH)_nCl_(6-n))_m, PAC) in the system resulted in no P element release. At 30 ℃, the anaerobic hydrolysis acidification of ReCoMag separated primary sludge could obtain more carbon sources, and avoid excessive yields of N and P loads.
引文
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[19]万芳.剩余污泥快速碱处理发酵液的资源利用研究[D].哈尔滨:哈尔滨工业大学,2012.
[2]申晓莹,张统,李志颖,等.磁分离水体净化技术磁粉成核机理研究[C]//全国给水排水技术信息网.全国给水排水技术信息网年会论文集.北京,2011:150-152.
[3]吴一平,刘莹.初沉污泥厌氧水解/酸化产物作为生物脱氮除磷系统碳源的试验研究[J].西安建筑科技大学学报(自然科学版),2004,36(4):421-423.
[4]CHA G C,NOIKE T.Effect of rapid temperature change and HRT on anaerobic acidogenesis[J].Water Science and Technology,1997,36(6/7):247-253.
[5]FERREIRO N,SOTO M.Anaerobic hydrolysis of primary sludge:influence of suldge concentration and temperature[J].Water Science and Technology,2003,47(12):239-246.
[6]LI X,PENG Y,REN N,et al.Effect of temperature on short chain fatty acids(SCFAs)accumulation and microbiological transformation in sludge alkaline fermentation with Ca(OH)2adjustment[J].Water Research,2014,61:34-45.
[7]吴昌生,徐锐,刘绍根,等.温度对碱预处理絮凝污泥水解酸化影响研究[J].安徽建筑大学学报,2016,24(1):59-64.
[8]李军,任健,王洪臣,等.初沉污泥水解酸化实验研究[J].北京工业大学学报,2008,12(12):1304-1308.
[9]国家环境保护总局.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[10]高永青,张晶宇,彭永臻,等.pH值对剩余污泥水解酸化溶出物的影响[J].北京工业大学学报,2011,37(1):139-145.
[11]梅翔,潘蕊,李佳,等.利用皂角粉促进污泥水解酸化[J].环境工程学报,2016,10(10):5847-5854.
[12]宋艳美.生物强化剩余污泥发酵液厌氧产酸特性的研究[D].哈尔滨:哈尔滨工业大学,2014.
[13]FENG L,WANG H,CHEN Y,et al.Effect of solids retention time and temperature on waste activated sludge hydrolysis and short-chain fatty acids accumulation under alkaline conditions in continuous-flowreactors[J].Bioresource Technology,2009,100(1):44-49.
[14]刑光熹,曹亚烃.太湖地区水体氮的污染源和反硝化[J].中国科学(B辑),2001,31(2):130-136.
[15]苏高强,王淑莹,郑冰玉,等.温度和污泥浓度对碱性条件下剩余污泥水解酸化的影响[J].环境工程学报,2013,7(4):1231-1236.
[16]郭京京.强化污水处理厂剩余污泥微氧水解酸化的研究[D].北京:北京工业大学,2017.
[17]张胜.初沉污泥和剩余污泥的中温厌氧消化特性研究[D].北京:北京林业大学,2012.
[18]陈广银,吕利利,杜静,等.温度和紧实度对秸秆水解产酸的影响[J].环境工程学报,2017,11(1):522-528.
[19]万芳.剩余污泥快速碱处理发酵液的资源利用研究[D].哈尔滨:哈尔滨工业大学,2012.