污泥厌氧消化中新型污染物去除的研究进展*
2016-03-13杨安琪张光明王洪臣王园园
杨安琪 杨 光 张光明 王洪臣 王园园
(中国人民大学环境学院,北京 100872)
随着社会经济和工业技术的快速发展,多种有毒性、难降解的新型物质得到广泛应用,在给人们日常生活带来诸多便利的同时,对生态环境及人体健康产生潜在威胁。近年来,城市污水中检出多种新型污染物[1-2],主要包括药物、个人护理品(PCPs)、雌激素、表面活性剂、工业添加剂和阻燃剂等[3]。
城市污水经活性污泥法处理后,近65%(质量分数)的新型污染物通过吸附、降解等作用转移到污泥中[4-5]。截至2014年,我国污泥年总产量近3 359万t[6],含有新型污染物的污泥在脱水农用、焚烧或直接填埋过程中均会对环境带来严重破坏。厌氧消化因能有效实现污泥的减量化和资源化被越来越多地运用到污泥处理中[7]。厌氧消化对污泥中新型污染物的去除效果是目前的研究热点,而新型污染物种类繁多复杂,浓度差异大,且具有一定区域特性,鉴于此,本研究归纳总结了污泥中新型污染物的种类、来源及检出现状,并分析其在厌氧消化过程中的去除情况,以期为我国在此方面的后续研究提供理论依据。
1 污泥中的新型污染物
目前,新型污染物的定义尚不明确,通常指能在环境中检测出但未列入常规监测的一类对生态环境及人体健康存在威胁的污染物[8-9]。不同种类的新型污染物在危害、主要来源以及在污泥中的浓度范围上存在很大差别。
1.1 新型污染物的种类
对2000—2015年有关污泥中各类新型污染物的文献进行整理分析,将污泥中检测出的新型污染物分为8类(见表1),经核算得出药物、工业添加剂、表面活性剂及其代谢产物是目前研究最多的3种新型污染物。
表1 污泥中新型污染物种类
污泥中的药物主要包括抗生素类药物(如土霉素、氧氟沙星、磺胺甲恶唑等)及精神性药物(如卡马西平等)。目前,已有研究发现,在长期的低剂量药物条件下,污泥中的微生物会被诱导产生耐药性基因,污泥经填埋或农用后,带有耐药性基因的微生物将参与到物质能量循环中并最终进入人体,经不断积累使人类产生抗药性[10-11]。污泥中的工业添加剂主要有多氯联苯、邻苯二甲酸酯等,此类物质多具有亲脂性、不易降解等特点,可通过食物链的放大作用在生物体内蓄积,从而对生态平衡及人类健康造成巨大影响[12-13]。
表面活性剂是指具有一定亲水、亲油基团结构,能显著降低溶剂表面张力和液液界面张力的物质[14]。目前,污泥中已检测出的表面活性剂主要包括阴离子表面活性剂直链烷基苯磺酸、非离子表面活性剂壬基酚聚氧乙烯醚及其他阳离子表面活性剂等,而壬基苯酚作为表面活性剂的代谢中间体也大量存在于污泥中。
1.2 新型污染物的来源
由于各类新型物质在生产、生活中的广泛应用,污泥中新型污染物的来源有很多,污泥中的药物主要通过医院废水、制药废水和养殖场废水等进入城市污水处理系统[15-16],而多氯联苯、双酚A等工业添加剂及有机锡化合物、全氟化合物大多是在化工厂的生产、加工过程中通过残留在工厂废水中进入污水管网,并最终进入污泥。表面活性剂由于具有增溶、洗涤、抗静电等一系列物理化学作用,是洗涤剂的主要成分,主要通过生活污水进入城市污水处理系统。由于三氯生、三氯卡班等物质具有较强的疏水性,因此污水中超过80%(质量分数)的个人护理品均被吸附到污泥中[17-18]。溴系阻燃剂和部分工业添加剂主要来源于电子产品和塑料制品,通过生活污水和垃圾渗滤液进入城市污水处理系统,从而吸附到污泥中。有机锡化合物、雌激素类物质是农用杀虫剂的主要成分,因此水果、蔬菜上残留的农药多经过生活污水进入城市污水处理系统,且多数雌激素类物质具有较强的疏水性,不易降解,容易富集在污泥中[19-20]。
1.3 检出情况
新型污染物来源广泛,不易降解,物理化学性质各异,其在污泥中的含量由于污水处理系统运行参数及地区差异等因素存在很大差异。
表2 污泥中各类新型污染物的质量浓度
注:1)指在干污泥中的质量浓度。
目前,污泥中检测出的药物质量浓度为0.1~58 100.0 μg/kg(以干污泥中的质量浓度计,下同)。CHEN等[21]从我国13个省份采集了45个污泥样品进行分析,从中检出30余种药物,其中氧氟沙星含量最高,质量浓度可达24 760 μg/kg。对于工业添加剂,由于多氯联苯、双酚A、邻苯二甲酸酯等物质在常规的污水处理系统中基本得不到降解,大多通过吸附作用转移到污泥中,因此其在污泥中浓度范围较广。表面活性剂及其代谢产物是污泥中含量最高的新型污染物[22-24]。污泥中各种新型污染物的质量浓度范围汇总见表2。
2 厌氧消化对污泥中新型污染物的去除
由于检测难度较大,目前我国还未将新型污染物列入污泥常规检测项目,但其对生态环境及人类健康的危害已日益凸现,因此新型污染物在污泥处理处置过程中的去除情况受到越来越广泛的关注。
在污泥厌氧消化过程中,生物降解和吸附是新型污染物的主要去除途径[52]。其中,大多数新型污染物通过生物降解去除[53],而具有疏水性的新型污染物主要通过吸附到悬浮颗粒物或胶体上得以去除[54]。厌氧消化运行参数对不同新型污染物的去除可产生不同的影响。如污泥停留时间(SRT)和温度对药物、阴离子表面活性剂、合成麝香和双酚A的去除没有明显的影响,而对于雌三醇,中温厌氧消化较高温厌氧消化的去除效果好,但高温厌氧消化却能显著提高雌酮、壬基苯酚等的去除效果[55]。厌氧消化条件下污泥中新型污染物去除率汇总见表3。
2.1 药 物
药物具有来源多、浓度范围广、毒性强等特点,已成为污泥中研究最多的一类新型污染物。药物中不同物质在厌氧消化过程中的去除效果存在很大差异。CARBALLA等[56]研究了相同消化条件下不同药物的去除情况,结果表明,厌氧消化对污泥中磺胺甲恶唑的去除率可达99%以上,而对卡马西平几乎不降解去除。NARUMIYA等[57]也发现类似的结果,其研究还发现,磺胺甲恶唑的去除率总体大于90%,而氧氟沙星的去除率在30%~50%。
2.2 雌激素
表3 厌氧消化条件下污泥中不同新型污染物的去除率
注:1)指在混合污泥中的质量浓度;2)指在初沉污泥中的质量浓度。
目前,有关雌激素在污泥厌氧消化中的去除效果研究存在着争议。ANDERSEN等[63]认为,雌酮、雌二醇在厌氧条件下几乎不降解。但有研究发现,雌激素在厌氧消化条件下不仅可以降解,且去除率随着温度的上升得到提高[64]。此外,PATERAKIS等[58]在比较初沉污泥和混合污泥厌氧消化去除雌激素的实验中发现,雌酮与雌三醇在初沉污泥厌氧消化中的去除率明显高于在混合污泥中的去除率,其原因可能与初沉污泥中松散的有机污泥絮体更容易被微生物充分利用有关。
2.3 表面活性剂及其代谢产物
有研究表明,由于部分阴离子表面活性剂可作为碳源被厌氧消化细菌利用,因此在无共基质存在的条件下,阴离子表面活性剂更容易被微生物利用从而达到较高的降解效率[65]。与阴离子表面活性剂相比,阳离子表面活性剂的降解相对困难。TEZEL等[66-67]研究发现,阳离子表面活性剂在污泥厌氧消化过程中几乎不能被生物降解。但ISMAIL等[68]研究发现,阳离子表面活性剂中烷基链的增长有助于提高其吸附去除效果。LU等[69]发现,与中温厌氧条件相比,壬基酚聚氧乙烯醚在高温厌氧条件下更容易被降解。PATUREAU等[70]的实验结果表明,壬基酚聚氧乙烯醚在污泥高温厌氧消化中的最终去除率可达30%。CHANG等[71]发现,当易生物降解的碳源与表面活性剂的代谢产物壬基苯酚共存时能提高其生物降解速率,主要原因是易降解碳源对整体代谢的刺激促进了壬基苯酚的生物降解进程。
2.4 个人护理品
个人护理品在污泥中的检测已受到广泛关注,但有关其在污泥厌氧消化中去除情况的研究却不多见。目前,有关三氯生和三氯卡班去除效果的研究仍存在争议。HEIDLER等[72]认为,污泥厌氧消化不能对此类物质进行有效降解。而VEETIL等[73]研究发现,当有醋酸盐作为共基质存在时,三氯生可在污泥厌氧消化过程中得到有效的生物降解,其主要降解产物为苯酚、邻苯酚和2,4-二氯苯酚。此外,佳乐麝香和吐纳麝香在厌氧消化中的去除率分别可达到69%±9%、63%±14%[74],且均以吸附在悬浮颗粒物上为主要的去除方式。
2.5 溴系阻燃剂
多溴联苯醚是溴系阻燃剂中最主要的一类[75-76]。研究发现,多溴联苯醚在厌氧消化中的去除率为22%~40%,推测微生物的还原脱溴作用是其降解的主要原因。此外,有研究指出,由于多溴联苯醚的生物活性较低,限制了其在污泥厌氧消化的生物降解效率,因此多溴联苯醚在厌氧消化池中存在一个阈值浓度,低于该阈值浓度时脱卤过程将无法进行[77]。
2.6 工业添加剂
邻苯二甲酸酯在污泥厌氧消化过程中的去除与其烷基链的长度密切相关,烷基链越长,越难降解[78]。有研究发现,邻苯二甲酸酯的去除路径以侧链酯的连续水解开始,此后邻苯二甲酸和烷基醇被逐渐降解为甲烷和二氧化碳,其中90%(质量分数)的甲烷产生于邻苯二甲酸二异辛酯(DEHP)[79]。因此,以往研究中多数学者主要关注DEHP在污泥厌氧消化过程中的去除效果。MARTTINEN等[80]发现,DEHP在污泥厌氧消化中的去除率为32%。有学者认为,DEHP在厌氧消化中的降解效率由接种污泥的性质决定,当接种污泥中的微生物能有效抵抗DEHP造成的毒性环境时,其降解效率将大幅提高[81]。对于另一种工业添加剂——双酚A,STASINAKIS等[82]研究发现,其在的污泥厌氧消化过程中的去除效果不受SRT影响。
2.7 有机锡化合物
目前,有关有机锡化合物在厌氧消化中去除情况的研究鲜有报道,主要是由于有机锡化合物在厌氧消化条件下的去除率很低,一般低于30%。VOULVOULIS等[83]认为,有机锡化合物降解效率低的原因可能与其对发酵细菌的抑制作用有关。
2.8 全氟化合物
全氟化合物具有极高的稳定性,一般的水解、光解和生物降解对其影响甚小。LIOU等[84]研究发现,全氟化合物在长期厌氧消化中并未发生降解。此外,SCHULTZ等[85]利用质量平衡法研究污泥厌氧消化过程中全氟化合物的降解情况,发现全氟癸磺酸钠、全氟癸酸甲酯的含量没有变化,而全氟辛烷磺酸、全氟壬酸的含量却有所增加,说明在污泥厌氧消化过程中可能存在前体物质的转化。
3 结 语
本研究总结了污泥中各类新型污染物的来源、浓度范围及其在厌氧消化过程中的去除情况。可以看出,表面活性剂及其代谢产物是污泥中浓度最高的新型污染物,目前有关药物在厌氧消化过程中去除及降解路径的研究最多。不同新型污染物在污泥厌氧消化进程中的去除率和去除路径受污染物的生物降解特性、SRT、温度、污泥性质等条件影响。其中,卡马西平、壬基苯酚、三氯卡班、有机锡化合物和全氟化合物等物质在污泥厌氧消化中的去除效果不好。
随着各类新型物质在不同领域中的应用不断增加,必然导致更多的新型污染物进入污水和污泥中,其对环境和人类健康的危害也会相应加大,为了实现厌氧消化对污泥中新型污染物更好地去除,今后研究需关注如下几点:(1)由于新型污染物种类繁多,目前的研究仅涉及极小部分新型污染物,因此应加强厌氧消化对污泥中更多种新型污染物去除的研究;(2)已有研究表明,部分预处理方式(如臭氧、超声波)能显著提高新型污染物在污泥厌氧消化进程中的去除率,因此未来研究应尝试采用更多的预处理方法以及联合预处理方式提高污泥厌氧消化中新型污染物的去除效率;(3)在关注各种新型污染物去除效率的同时,应加强不同新型污染物在污泥厌氧消化中去除路径和降解机制的探究;(4)由于污泥中的新型污染物主要来自城市生活污水和工业污水,因此应加强新型污染物在污水中迁移、转化、去除的研究,这对于研究新型污染物在污泥厌氧消化过程的去除路径具有重要的指导意义;(5)目前污泥的主要处置方式为土地利用,因此污泥中新型污染物对土壤环境的影响及其影响机制有待进一步探索。
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