腐殖质在工业污染场地土壤修复中的应用综述

随着城市化发展和产业结构调整,大量遗留的工业污染场地对生态环境和人类健康构成严重威胁,新的修复技术和修复材料亟待开发,腐殖质作为天然有机材料对污染场地土壤修复的作用已经引起研究人员的广泛关注。综述了土壤腐殖质的结构与性质、分离与纯化方法,在此基础上阐述了腐殖质在工业污染场地土壤修复,特别是有机污染物和重金属修复中的作用,并介绍了腐殖质作为有机修复剂在土壤修复工程实践中的应用现状,最后提出腐殖质在土壤修复中还需要重点研究的方向,以期为腐殖质作为新的工程材料在土壤修复中的开发利用提供理论基础和技术参考。     

冻融-化学淋洗法协同修复重金属Cd和Pb污染黏性土

针对质地黏重、低渗透性黏性土的淋洗效率低下,该文提出冻融协同化学淋洗的修复方案,并以某冶炼厂受Cd、Pb污染场地黏性土为研究对象,选用乙二胺四乙酸二钠(ethylene diaminetetraacetic acid disodium salt,EDTA)为淋洗剂,进行了冻融-淋洗土柱的实证试验。结果表明,土体的反复冻融(冻胀-吸水、融沉-排水)破坏土体颗粒原有结构,有助于淋洗液与污染物充分接触,淋洗效果明显,经7次冻融后,Cd、Pb去除率分别达到77.24%、37.78%。采用改进的BCR(European Communities Bureau of Reference)连续提取法分析了土柱中Cd、Pb的赋存特征,经7次冻融后,土壤中弱酸提取态、可还原态、残渣态结合的Cd质量分数较淋洗前分别降低了41.46%、63.02%、26.33%,而土壤中可还原态和残渣态结合的Pb质量分数分别降低了32.32%、67.36%。冻融协同化学淋洗修复技术的淋洗剂用量远小于传统淋洗法,为今后利用寒区冻融交替现象,大规模对季冻区重金属污染土壤的异位修复提供了新的思路。     

淋洗法修复铬渣污染场地实验研究

铬渣污染场地已经列为我国土壤污染重点治理对象,急需修复铬渣污染土壤的关键技术。本文通过室内模拟实验,采用振荡淋洗的方法研究了水、EDTA、EDDS、柠檬酸、草酸、盐酸、磷酸、环糊精和十二烷基苯磺酸钠等淋洗剂对铬渣污染场地Cr的淋洗效果,探讨了淋洗剂浓度、淋洗时间、土水比、淋洗次数等对淋洗效果的影响,并研究了不同淋洗剂复合对Cr的淋洗效果以及不同浓度柠檬酸淋洗前后重金属形态的变化。结果表明：水、EDTA、EDDS、环糊精和十二烷基苯磺酸钠对Cr的去除率较低,柠檬酸在浓度为0.5mol·L-1、土水比1：20、反应时间为24h、淋洗次数为2次的条件下可以达到最佳淋洗效果,Cr的去除率可达到82.8%;SDBS、EDTA与柠檬酸单独组合顺序或者混合淋洗,都没有增加柠檬酸对Cr的去除率。重金属形态分析表明,柠檬酸淋洗有效地改变了Cr的形态从而达到较高的修复效果。当柠檬酸浓度小于0.25mol·L-1时,对铬的去除主要以C（rⅥ）为主;当柠檬酸浓度大于0.25mol·L-1时,对铬的去除主要以C（rⅢ）为主。本文的研究结果为异位淋洗修复铬渣污染土壤提供理论依据。     

花生油与羟丙基β环糊精对有机氯农药污染场地土壤异位增效淋洗修复研究

针对长三角典型区域内某废弃有机氯农药(OCPs)污染场地土壤,选择花生油和羟丙基β环糊精(HPCD)作为环境友好的淋洗剂,并嵌合超声强化、升温辅助等增效洗脱技术,研究了其对OCPs污染场地土壤的洗脱修复效果。结果发现,在100 ml/L 花生油和50 g/L HPCD、50?C水浴和35 kHz超声 30 min、连续淋洗5次条件下,土壤中DDTs、氯丹(Chlordanes)、灭蚁灵(Mirex)和总量OCPs的最大去除率分别为99.6% ± 2.2%、94.0% ± 1.3%、91.3% ± 2.0% 和96.0% ± 2.5%。同时采用Tenax TA树脂连续提取法,监测每次连续淋洗后土壤中各组分OCPs解吸特性,发现随着淋洗次数的增加,土壤中OCPs的400-h Tenax 可提取量逐渐减少,OCPs的快速解吸组分(Fr)和慢速解吸组分(Fsl)比例较原始土壤中的相应比例显著下降(P<0.01),OCPs的快速解吸速率常数(kr)、慢速解吸速率常数(ksl)和超慢速解吸速率常数(kvl)也较原始土壤中相应解吸速率常数显著降低(P<0.01)。综合考虑修复效率和土壤修复后潜在环境风险,3次淋洗可以认为较为合理。本研究为OCPs污染场地土壤的异位增效淋洗技术研发和淋洗终点判断提供了一种有效手段。     

工业废弃地多金属污染土壤组合淋洗修复技术研究

采用批量淋洗实验方法,对比了采用人工螯合剂乙二胺四乙酸二钠盐(EDTA-Na2)和天然有机酸草酸(oxalic acid,OX)对工业废弃地污染土壤中重金属的去除效果,并采用不同浓度草酸和EDTA组合的两步淋洗法研究多金属污染土壤的最佳淋洗方式。结果表明,EDTA淋洗剂对土壤中Zn、Pb、Cu、Ni去除效果较好,而对Cr去除效果较差,实验条件下,EDTA对金属的去除率并未随着浓度增加而增加;相反,草酸对Cr去除效果较好,且去除率随着淋洗剂浓度的增加而增加,而对Zn、Cu、Ni的去除效果随着淋洗剂浓度增加而降低,对Pb的去除率非常低;采用先以0.20 mol L-1草酸提取2 h,再以0.01 mol L-1EDTA提取2 h的两步淋洗法可以达到对多金属同时去除,且对Zn、Cu、Cr、Ni的去除率明显高于单用草酸和EDTA,总去除率分别为Zn 75.21%、Pb 21.30%、Cu 59.81%、Cr 60.72%和Ni 62.10%,更为有意义的是两步淋洗法对非残渣态金属去除效果分别高达Zn 91.93%、Pb 57.75%、Cu 75.33%、Cr 73.94%、Ni 77.99%。利用不同化学淋洗剂对金属去除能力的差异进行组合的多步淋洗法是一种较为高效的去除工业废弃地污染土壤中重金属的化学淋洗修复方法。     

化工厂遗留地铬污染土壤化学淋洗修复研究

选取了济南市某铬渣堆放场地表土壤为实验目标,采用振荡淋洗法研究了水、EDTA、柠檬酸、盐酸、Ca Cl2、Na OH和磷酸等淋洗剂对铬污染场地铬污染物的淋洗效果,并从中筛选出最佳淋洗剂,探讨了淋洗剂浓度、土液质量比、振荡淋洗时间、淋洗液p H等对淋洗条件的影响。结果显示,选取的土壤样品均超过国家土壤标准,钛白生产车间土样污染程度最轻,北部厂区污染最重,最高铬污染物含量达到7 149 mg kg-1;土壤活性指数I显示,万吨铬盐生产车间土壤的活性指数最高达到0.291 8,铬盐生产车间活性指数最低;水、盐酸、柠檬酸、Ca Cl2、Na OH、磷酸等对总铬的去除率比较低,EDTA的淋洗效果最佳;EDTA的最佳淋洗浓度为0.1 mol L-1;最适土液质量比为1∶10;最适振荡淋洗时间为1 h;最适淋洗液p H为5;所有淋洗试验最高去除率为p H 10时,北部厂区样品在0.1 mol L-1EDTA淋洗液,土液质量比为1∶10,振荡淋洗时间1 h取得,总铬的去除率可达到22%,Cr6+去除率可达到98.5%。     

柠檬酸/柠檬酸钠淋洗铬污染土壤效果及弱酸可提取态铬含量的变化

研究了用0.2 mol.L-1柠檬酸/柠檬酸钠（摩尔比为1∶1）复合淋洗剂对污染土壤中铬的淋洗效果,及淋洗过程中C（rⅥ）和C（rⅢ）以及弱酸可提取态的含量随淋洗时间的变化,污染土壤取自于沈阳市沈北新区铬渣堆放场地污染土壤。结果表明,在该复合淋洗剂的解吸附与络合的双重作用下,总铬的短时间去除效率较高,淋洗8 h和24 h的去除率分别为33.6%和36.0%,其中淋洗24h时C（rⅥ）和C（rⅢ）的去除率分别达到38.5%和30.0%。淋洗过程中土壤中铬的形态发生了重新分配,弱酸可提取态占总铬比例增加,从而有利于铬在土壤中的迁移。     

菌根真菌对土壤有机污染物的生物降解

利用土壤真菌和植物的结合体菌根真菌修复土壤，尤其是修复有机污染的根际土壤，正作为一个新的研究方向开始受到广泛关注。菌根真菌作为土壤真菌的一种，与放线菌和细菌等微生物相比，对土壤中有更大的忍耐能力，并且能将许多持久性有机污染物（POPs）做为碳源来获取能量。文章通过总结近20年菌根真菌与土壤有机污染物关系的研究。列出了43种能分解POPs的菌根真菌，并探讨了菌根真菌通过直接分解和共代谢的方式降解土壤有机污染物的可能性，为进一步研究菌根真菌生物降解土壤中持久性有机污染物，利用菌根植物生物修复有机污染土壤提供信息。     

过一硫酸盐的化学氧化机理及在有机污染土壤修复中应用研究进展

基于过一硫酸盐(PMS)的高级氧化技术因反应快速高效、降解有机污染物效果优越,在环境修复领域拥有广阔的应用潜能。经过活化的PMS化学氧化技术在有机污染废水处理中被广泛应用,污染物的去除机制也在不断被发现并完善,其在有机污染土壤修复中也已得到应用。本文综述了PMS对有机污染物的化学氧化机制,分析了有机污染物降解的自由基和非自由基反应过程,探讨了不同活化方式(碱、过渡金属、碳基材料、辐射等)对PMS降解有机污染物的影响,阐述了PMS在有机污染土壤修复中的研究进展和存在问题,并进行了研究展望。     

多环芳烃污染土壤生物联合强化修复研究进展

多环芳烃(polycyclic aromatic hydrocarbons,PAHs)是广泛存在于环境中的一类有毒有机污染物。在PAHs污染土壤修复领域中,运用一些生物化学的方式来强化生物联合修复技术可以有效缩短生物修复的时间,大大提高修复效率,最具发展前景和应用价值。本文主要以植物-微生物、植物-微生物-土壤动物两种生物联合修复方式为对象,结合各自的特点、机理和实例,推断了其修复机制的内在原因,总结了影响土壤中PAHs降解效率的主要因素(包括:PAHs的浓度水平、根系分泌物的种类、外源添加降解菌和土壤动物的数量和种类、菌属或土壤动物之间的种间竞争和部分环境因素等);同时通过综述近年来国内外强化生物联合修复PAHs污染土壤的技术原理、应用成果和存在的一些问题,指出了不同情况下制约PAHs强化降解进程的潜在限制因子(包括:表面活性剂和固定化微生物的添加量、不同表面活性剂的适度混合、载体材料的性质、固定化方式的选取、土壤养分和水分含量等);并强调在进行强化修复的过程中,要注重现场应用和安全性评价,为多环芳烃污染土壤的生物联合强化修复研究提供了理论依据和技术参考。     

Biodegradation combined with ozone for the remediation of contaminated soils

The effectiveness of the SS-SBR (Soil Slurry – Sequencing Batch Reactor) process for the remediation of soils contaminated by several organic pollutants has been evaluated. Experimental tests have been performed on two different soils, a spiked one and an industrial aged soil. The spiked soil, artificially contaminated, has been prepared trying to simulate the pollution of an industrial aged soil in terms of number and kind of contaminants. PAHs (Polycyclic Aromatic Hydrocarbons) and phenols degradation has been particularly investigated because they are considered persistent and recalcitrant. Concerning the spiked soil, removal efficiencies higher than 95% in 6 to 9 weeks have been found for all the pollutants, except for five-rings PAHs; however, these compounds were partly removed in 11 to 13 weeks. Good results have been achieved also for the industrial aged soil with a maximum removal of about 80% in 7–8 weeks. To enhance the pollutants degradation, trying to obtain a faster remediation, the biological treatment has been combined with a chemical oxidation with ozone. The best degradation effectiveness of the combined process has been obtained applying the ozonation after few days of the biological treatment. Therefore, a combined biological and chemical treatment allowed to markedly improve the remediation of contaminated soils.     

EDTA Leaching of Cu Contaminated Soils Using Ozone/UV for Treatment and Reuse of Washing Solution in a Closed Loop

Ozone and UV irradiation were used for oxidative decomposition of EDTA-Cu complexes in washing solution obtained during multi-step leaching of Cu (344,1?±?36.5 mg kg^?1) contaminated vineyard soil with EDTA as a chelant. The released Cu was absorbed from the washing solution on a commercial mixture of metal absorbing minerals, and the treated washing solution then reused for removal of soil residual Cu-EDTA complexes in a closed-loop process. Six consecutive leaching steps (6?×?2.5 mmol kg^?1 of EDTA) removed 38.8 % of Cu from soils, and reduced Cu soil mobility, determined using the toxicity characteristic leaching test (TCLP), by 28.5%. The final washing solution obtained after soil remediation was colourless, with a pH close to neutral (7.5?±?0.2) and with low concentrations of Cu and EDTA (0.51?±?0.22 mg L^?1 and 0.083 mM, respectively). The proposed remediation method has therefore potential not just to recycle and save process water, but also not to produce toxic wastewaters. Soil treatment did not substantially alter the soil properties determined by pedological analysis, and had relatively little impact on soil hydraulic conductivity and soil water sorption capacity.     

Remediation of lead-, arsenic-, and cesium-contaminated soil using consecutive washing enhanced with electro-kinetic field

Purpose

Extensive deposition of Pb, As, and Cs in soils may damage ecosystems and human’s health. Soil washing is the most conventional remediation method, and its efficiency depends on metal solubility in soil. This study aims to optimize operating variables of electro-kinetic field (EKF)-enhanced soil washing procedures.

Materials and methods

Soil samples from a Mississippi River Delta rice field were homogeneously spiked with Pb, As, and Cs, and contaminated soil was aged for 3 months. The remediation involved a first stage electro-kinetic process, followed by a soil washing procedure. Soil pH changes under EKF were studied. Effects of citric acid and reversed EKF were investigated for alleviating possible alkaline precipitation. In the washing procedure, soil washing time and cycles with different extractants were examined. The overall EKF-enhanced soil washing efficiencies were discussed as well.

Results and discussion

The implement of EKF offered an acidic soil environment around the anode areas for solubilizing metal(loid)s. Combined with EKF, citric acid was more conductive to desorb metal(loid)s. In addition, the reversed EKF effectively alleviated metal(loid) precipitation caused by alkalization in the first stage cathode areas. The EKF significantly enhanced metal(loid) extractions in the anode area of soils using Na₂EDTA, CaCl₂, and citric acid at pH of 2. The most preferable removal of Pb (80–98 %), As (48–63 %), and Cs (10–13 %) was achieved with three extractants. CaCl₂ and citric acid were proved to be suitable alternatives to Na₂EDTA for Pb extraction. A washing process of 2 h extraction with double washing cycles was optimized.

Conclusions

Soil washing time and cycles were major factors governing the metal(loid) removal from soil. Washing process of 2 h extraction with double cycles was optimized for further extraction based on higher washing efficiency. The EKF effectively improved washing efficiency while some electrical parameters need further studies for cost performance consideration.

     

土壤重金属生物淋滤修复过程中廉价碳源的筛选研究

在室内模拟实验条件下,重点研究了一步和二步生物淋滤过程中黑曲霉利用各种廉价碳源替代蔗糖产酸修复重金属污染土壤的效果。结果发现,杨树叶、桃树叶、土豆皮去除重金属效果较好。其中杨树叶对冶炼厂土壤中重金属去除率分别为Cu63．5％、Cd100％、Pb16．8％和Zn27％;桃树叶去除效果分别为Cu61．8％、Cd100％、Pb14．6％和Zn28．5％;土豆皮去除效果分别为Cu61％、Cd100％、Pb10．6％和Zn34％。廉价碳源的使用可降低污染土壤生物淋滤修复成本。     

Tween 80对DDTs污染场地土壤的增溶洗脱效果研究

以苏南某滴滴涕类化合物（DDTs）污染场地土壤为研究对象,进行实验室批量洗脱试验,研究了环境友好型表面活性剂Tween 80对土壤中DDTs的增溶洗脱效果及其影响因素。结果表明,Tween 80显著地增加了DDTs表观溶解度,在临界胶束浓度（CMC）以上对DDTs的增溶曲线呈指数衰减函数关系,DDTs各组分洗脱量顺序为4,4′-DDT〉4,4′-DDD〉2,4′-DDD〉2,4′-DDT。Tween 80的浓度、洗脱次数及土壤吸附作用共同影响其对DDTs的洗脱效果。去离子水能有效去除土壤中残留Tween 80,Tween 80解吸附率最高可达72.66%,大大降低了Tween 80二次污染土壤的风险。Tween 80增溶和去离子水解吸附联合过程对DDTs洗脱效果产生显著的协同作用。10 000 mg·L^-1浓度条件下Tween 80对DDTs的去除率最高为72%,其次为8 000 mg·L^-1 的Tween 80水溶液,去除率为66.72%。采用8 000 mg·L^-1的Tween 80溶液进行土壤洗涤处理,结合其他修复技术,可能会是修复DDTs污染土壤的有效技术方案之一。     

Comparison of Fenton's Reagent and Ozone Oxidation of Polycyclic Aromatic Hydrocarbons in Aged Contaminated Soils (7 pp)

Background, Aim and Scope   Polycyclic aromatic hydrocarbons (PAHs) are formed as a result of incomplete combustion and are among the most frequently occurring contaminants in soils and sediments. PAHs are of great environmental concern due to their ubiquitous nature and toxicological properties. Consequently, extensive research has been conducted into the development of methods to remediate soils contaminated with PAHs. Fenton's reagent or ozone is the most commonly studied chemical oxidation methods. However, the majority of remediation studies use soils that have been artificially contaminated with either one or a limited number of PAH compounds in the laboratory. Hence, it is essential to extend such studies to soils contaminated with multiple PAHs under field conditions. Objectives   The objective of this study is to investigate the capacity of Fenton's reagent and ozone to degrade PAHs in soils. The soils have been collected from a number of different industrial sites and, therefore, will have been exposed to different PAH compounds in varying concentrations over a range of time periods. The capacity of Fenton's reagent and ozone to degrade PAHs in industrially contaminated soils is compared to results obtained in studies using soils artificially contaminated with PAHs in the laboratory. Materials and Methods: Nine soil samples, contaminated with PAHs, were collected from five different industrial sites in Sweden. For the Fenton's reagent procedure, the pH of the soil slurry samples was adjusted to pH 3 and they were kept at a constant temperature of 70oC whilst H2O2 was added. For the ozone procedure, soil samples were mixed with 50% water and 50% ethanol and kept at a constant temperature of 45 oC. Ozone was then continually introduced to each soil sample over a period of four hours. Following the Fenton's reagent and ozone oxidation procedures, the samples were filtered to isolate the solid phase, which was then extracted using pressurized liquid extraction (PLE). The sample extracts were cleaned up using open columns and then analysed by gas chromatography-mass spectrometry (GC-MS). Results: The relative abundance of the detected PAHs varied between soils, associated with different industries. For example, low molecular weight (LMW) PAHs were more abundant in soil samples collected from wood impregnation sites and high overall PAH degradation efficiencies were observed in soils originating from these sites. In the contaminated soils studied, PAHs were more effectively degraded using Fenton's reagent (PAH degradation efficiency of 40-86%) as opposed to ozone (PAH degradation efficiency of 10-70%). LMW PAHs were more efficiently degraded, using ozone as the oxidizing agent, whereas the use of Fenton's reagent resulted in a more even degradation pattern for PAHs with two through six fused aromatic rings. Discussion: The degradation efficiency for both methods was largely dependent on the initial PAH concentration in the soil sample, with higher degradation observed in highly polluted soils. LMW PAHs are more susceptible to degradation than high molecular weight (HMW) PAHs. As a result of this the relative abundance of large (often carcinogenic) PAHs increased after chemical oxidation treatment, particularly after ozone treatment. Repeated Fenton's reagent treatment did not result in any further degradation of soil PAHs, indicating that residual soil PAHs are strongly sorbed. The effectiveness of the two oxidation treatment approaches differed between industrial sites, thus highlighting the importance of further research into the influence of soil properties on the sorption capacity of PAHs. Conclusions: This study demonstrates that the degree to which chemical oxidation techniques can degrade soil bound PAHs chemical degradation is highly dependent on both the concentration of PAHs in the soils and the compounds present, i.e. the various PAH profiles. Therefore, similarities in the PAH degradation efficiencies in the nine soil samples studied were observed with the two chemical oxidation methods used. However, the degradation performance of Fenton's reagent and ozone differed between the two methods. Overall, Fenton's reagent achieved the highest total PAH degradation due to stronger oxidation conditions. LMW PAHs showed higher susceptibility to oxidation, whereas high molecular weight (HMW) PAHs appear to be strongly sorbed to the soils and therefore less chemically available for oxidation. This study highlights the importance of including soils collected from a range of contaminated sites in remediation studies. Such soil samples will contain PAH contaminants of varying concentrations, chemical and physical properties, and have been aged under field conditions. In addition to the chemical and physical properties of the soils, these factors will all influence the chemical availability of PAHs to oxidation. Recommendations and Perspectives: We recommend including aged contaminated soils in chemical degradation studies. In future chemical remediation work, we intend to investigate the potential influence of the chemical and physical properties of PAHs and soil parameters potential influence on the chemical oxidation efficiency in aged contaminated soils. Due to the vast number of contaminated sites there is a great need of efficient remediation methods throughout the world. This study shows the difficulties which may be experienced when applying remediation methods to a variation of contaminated sites.     

Community structure of arbuscular mycorrhizal fungi associated with Robinia pseudoacacia in uncontaminated and heavy metal contaminated soils

The significance of arbuscular mycorrhizal fungi (AMF) in soil remediation has been widely recognized because of their ability to promote plant growth and increase phytoremediation efficiency in heavy metal (HM) polluted soils by improving plant nutrient absorption and by influencing the fate of the metals in the plant and soil. However, the symbiotic functions of AMF in remediation of polluted soils depend on plant–fungus–soil combinations and are greatly influenced by environmental conditions. To better understand the adaptation of plants and the related mycorrhizae to extreme environmental conditions, AMF colonization, spore density and community structure were analyzed in roots or rhizosphere soils of Robinia pseudoacacia. Mycorrhization was compared between uncontaminated soil and heavy metal contaminated soil from a lead–zinc mining region of northwest China. Samples were analyzed by restriction fragment length polymorphism (RFLP) screening with AMF-specific primers (NS31 and AM1), and sequencing of rRNA small subunit (SSU). The phylogenetic analysis revealed 28 AMF group types, including six AMF families: Glomeraceae, Claroideoglomeraceae, Diversisporaceae, Acaulosporaceae, Pacisporaceae, and Gigasporaceae. Of all AMF group types, six (21%) were detected based on spore samples alone, four (14%) based on root samples alone, and five (18%) based on samples from root, soil and spore. Glo9 (Rhizophagus intraradices), Glo17 (Funneliformis mosseae) and Acau3 (Acaulospora sp.) were the three most abundant AMF group types in the current study. Soil Pb and Zn concentrations, pH, organic matter content, and phosphorus levels all showed significant correlations with the AMF species compositions in root and soil samples. Overall, the uncontaminated sites had higher species diversity than sites with heavy metal contamination. The study highlights the effects of different soil chemical parameters on AMF colonization, spore density and community structure in contaminated and uncontaminated sites. The tolerant AMF species isolated and identified from this study have potential for application in phytoremediation of heavy metal contaminated areas.     

锯末对生物修复荧蒽和芘污染土壤的强化作用及影响因素

通过土壤微宇宙培养试验,研究了锯末尺寸、添加量和种类等因素对荧蒽特效降解菌MC(Mycobacterium flavescens)修复污染土壤(潮土、红壤、黑土、黄棕壤和水稻土)的效果.结果表明:锯末联合降解菌MC修复荧蒽污染的黄棕壤效果较好,优化条件下25 d荧蒽降解率为42.63％ ±1.05％;该联合修复对黑土和...     

基于AHP筛选的有机污染土联合修复技术案例研究

为了研究联合修复技术在有机物污染场地中的筛选方法以及修复效果，以山西某搬迁遗留场地土壤修复工程为案例，本文提出了采用层次分析法（AHP）对常用的物理、化学、生物修复技术方法进行优选，最终确定“常温解吸+异位热脱附+填埋场覆土利用+水泥窑协同处置”的新联合修复模式，并且研究了该联合修复模式的处理效果及其对环境造成的影响。结果表明，AHP可用于有机污染场地修复最佳方案的筛选；采用该联合修复模式费用低、效果良好且未对周围环境造成影响。可见该联合修复模式能够有效地处理此类型场地污染土体。该修复模式的成功实施为类似污染场地土壤修复项目提供了借鉴和参考价值，并在一定程度上控制了土壤资源的流失。