废弃油基钻井液热化学破乳-离心分离实验

废弃油基钻井液是一种含油量较高的油包水稳定体系,具有回收利用价值。采用热化学破乳-离心分离的方法,考察了破乳剂加量、破乳温度、离心机转速、破乳时间、离心时间和破乳剂浓度对废弃油基钻井液分离的影响。通过实验确定了破乳效果最好的破乳剂为巴斯夫L62,并对热化学破乳-离心分离废弃油基钻井液的影响因素进行了优化实验研究。实验结果表明,在破乳剂加量300 mg/L、离心机转速8 000 r/min、破乳温度80℃、破乳时间3 h、离心时间25 min和破乳剂质量浓度0.25%的条件下,热化学破乳-离心法处理废弃油基钻井液的脱水率达75%、脱油率达72.73%。热化学破乳-离心分离方法回收废弃油基钻井液中的油具有潜在的应用价值。     

废弃油基钻井液提取柴油剩余废弃物无害化处理研究

针对废弃油基钻井液中柴油回收过程产生的泥渣、废水、废白土和酸碱废渣具有高色度、高pH、高COD和高石油类的特点,通过优化实验得出了一步法无害化处理废弃混合物的最佳固化配方:水泥和粉煤灰加量分别为12.5%,激活剂SG加量1.5%,促凝剂LSL加量1.5%,石灰加量1%。在最佳固化配方下,固化体浸出液的各主要污染指标都符合《污水综合排放标准》(GB 8978-1996)一级标准,固化成本约100元/m3,与分别处理废渣、废液相比,其处理成本可降低约20%。     

逆流萃取+臭氧氧化联合工艺处理油基岩屑的效果

为解决页岩气开采过程中产生的油基岩屑的资源化、无害化处理问题,采用逆流萃取+臭氧氧化联合的方法对其进行处理,并分别对逆流萃取、臭氧氧化环节的工艺参数进行了优化。结果表明,在最优条件下,经过处理后的油基岩屑的含油率可由原始的39.42%降低到0.18%,达到了GB 4284-2018中规定的处置要求,处理过程中回收的油分可重新用于配制钻井液。通过对油基岩屑固相的表征,发现其具备臭氧催化氧化催化剂的明显特征,是一种天然的臭氧催化氧化催化剂,并从反应动力学角度对臭氧氧化环节的反应特性进行了定量分析。结果表明,其满足一级反应动力学特征,反应活化能为6.194 kJ·mol~(-1)。以逆流萃取+臭氧氧化为核心的联合工艺为油基岩屑的资源化、无害化处理提供了参考。     

基于响应面法优化废弃油基钻井液的萃取方法

针对油气田钻井过程中经多次循环导致基液老化变质而无法使用的废弃油基钻井液,采用响应面法优化废弃油基钻井液萃取实验。以石油醚(60~90℃)作为萃取剂,通过单因素实验确定了编码参数,考察了液料比(萃取剂与废弃油基钻井液加量质量比,g/g)、萃取温度、萃取时间3因素5水平的中心组合设计,建立数学模型并进行验证。结果表明,对于液料比1.5∶1,萃取时间25 min,萃取温度36.5℃的最佳萃取条件,萃取率的预测值为82.97%,实测值为82.18%,相对误差仅有0.95%。     

含油钻屑高效除油剂及除油机理研究

油基钻井液在复杂井、深井的钻井作业中受到越来越多的使用和重视,但相应也产生了大量的废弃含油钻屑,带来了环境污染问题。针对含油钻屑的特点,研制了一种高效除油剂HBS-6,在阴离子表面活性剂、非离子表面活性剂、溶剂和软水剂等组分的协同作用下,利用强化分离设备,实现了钻屑含油的去除与无害化处置,含油钻屑除油率达90%以上。同时,还采用红外光谱、气相色谱和液相色谱等分析手段,研究了除油剂HBS-6的作用机理。HBS-6含有HLB值高且能生物降解的阴离子表面活性剂,以保证除油剂的清洗能力和环保性,同时还采用HLB值低的非离子表面活性剂,以提高对油的乳化和除油能力,为含油钻屑的无害化处理拓展了一条新的技术途径。     

页岩气开发油基钻屑真空热解资源化处理

在页岩气开采过程中,因油基钻井液具有稳定性强、润滑力强等优势得以广泛应用,但也带来了油基钻屑处理问题。目前油基钻屑处理技术较落后,存在成本高、效果不理想等问题,探索一种高效油基钻屑处理技术非常紧迫。探讨了真空热解的各个条件对油基钻屑真空热解效果的影响,研究了不同热解条件下的热解特性并回收分析了热解油。研究结果表明:1)热解终温是影响油基钻屑热解效果的主要因素,随着热解终温、终温时间及真空度的提高,油基钻屑的热解效果提高;随着升温速度的提高,热解效果降低;2)油基钻屑热解的最优条件为:终温500℃,终温时间60 min,升温速度30℃·min~(-1)和真空度80 k Pa,在此条件处理后残渣含油率0.135%,低于国内外最严格排放标准值(0.3%),因此,真空热解资源化处理油基钻屑是可行的。     

超临界丙酮降解废弃线路板中的溴化环氧树脂

探讨废弃线路板中溴化环氧树脂在超临界丙酮中的脱溴降解特性,重点考察了温度、反应时间和有机溶剂添加量对溴化环氧树脂降解特性的影响,确立的最佳实验条件为:温度260℃、保温时间1~2 h、丙酮添加量20~40 mL,系统压强3~6 MPa,此时溴化环氧树脂能够快速降解,脱溴率达到97.94%,降解产物主要为苯酚和异丙基苯酚,含量分别为60.99%和3.12%,降解产物中溴主要以HBr的形式存在于油相中,可以用碱液从油相中萃取脱除。线路板经超临界丙酮处理后,铜箔与玻璃纤维自动分层解离便于后续破碎回收,为废弃线路板的无害化处理和资源回收利用提供了一条新途径。     

超临界丙酮降解废弃线路板中的溴化环氧树脂简

探讨废弃线路板中溴化环氧树脂在超临界丙酮中的脱溴降解特性，重点考察了温度、反应时间和有机溶剂添加量对溴化环氧树脂降解特性的影响，确立的最佳实验条件为：温度260℃、保温时间1~2 h、丙酮添加量20~40 mL，系统压强3~6 MPa，此时溴化环氧树脂能够快速降解，脱溴率达到97.94%，降解产物主要为苯酚和异丙基苯酚，含量分别为60.99%和3.12%，降解产物中溴主要以HBr的形式存在于油相中，可以用碱液从油相中萃取脱除。线路板经超临界丙酮处理后，铜箔与玻璃纤维自动分层解离便于后续破碎回收，为废弃线路板的无害化处理和资源回收利用提供了一条新途径。     

废弃荧光灯的回收处理方法及对策

废弃荧光灯不加处理或处置不当,会对人类健康产生极大危害.同时其中的有价资源可回收再利用.综述了国内外对废弃荧光灯的回收处理现状,总结了国内外废弃荧光灯的资源回收与处理方法,重点介绍了废弃荧光灯中汞和稀土元素的回收处理研究进展,提出了废弃荧光灯回收处理的相应对策.     

气井废弃泥浆微生物-固化复合处理技术

废弃泥浆的无害化处理对于油气田开发的可持续发展具有重要意义。针对废弃泥浆的特性,以浸出液重金属含量及COD等为考核指标,通过固化剂配方优选、微生物菌种优选与复配,对废弃泥浆进行了微生物-固化复合处理。结果表明,固化剂加量为20%、复合菌液4.0 m L,处理15 d后,废弃泥浆固化后的含水率为45%以下,浸出液的pH为7.2~9.0,Cu、Cd和Pb等重金属离子含量分别为17、0.28和8.7μg/L以下,COD低于100 mg/L,浸出液成分均符合GB 8978-1996Ⅰ级排放标准。     

医院旱厕粪便无害化处理研究

粪便是多种疾病的传染源。病人、潜伏期病原携带者、慢性病原携带者等，通过粪便排出病原体，使健康者受感染。医院是各类病人集中的地方，医院厕所粪便则是重要的疾病传染源。据有关报导，我国中小城镇排污处理设施不足，污水处理系统严重欠缺。乡、镇基层医院仍以旱厕为主，兼有少数水冲厕。贵州省现有县级及县级以下医院约２０００所，一般为旱厕，其粪便均未经无害化处理，成为当地重要的疾病传染源。文章着重介绍以两级厌氧池（Ａｎａｅｒｏｂｉｃｔａｎｋ）去除好氧病原菌为主，再由两级氧化池（Ｏｘｉｄａｔｉｏｎｔａｎｋ）去除厌氧病菌的双Ａ双Ｏ法，处理贵阳市传染病院门诊旱厕粪便，使其达到粪便无害化卫生标准（ＧＢ７９５９－８７），预防减少疾病传播；同时进行制取生物质能沼气的试验及研究。     

污水处理厂污泥无害化处置工艺探讨

随着当前的污泥处置技术的发展,在对污水处理厂污泥处置工艺经济可行性分析的基础上,按照因地制宜原则提出一种适宜于江阴市污水处理厂污泥无害化处置方案。即污泥经改性深度脱水至含水率50%以下,再送热电厂掺煤焚烧处置工艺路线。     

电解锰渣无害化处理技术简

电解锰渣是湿法电解金属锰工艺产生的废渣，环境危害性大、治理难度大。为消除锰渣的污染性，实验研究了锰渣浸出液中污染物种类，并分别采用生石灰和氢氧化钠作处理剂，从成本、处理效果方面进行比较，确定处理剂以及最佳运行条件。得出结论：锰渣中主要污染物为锰和氨氮（分别超过相关标准453倍和26倍），选取生石灰做处理剂，处理后的锰渣，浸出液中锰离子和氨氮的减排量分别达到99%和97%以上，水溶性锰离子浓度低于5 mg/L、氨氮浓度低于25 mg/L，均达到《污水综合排放标准》（GB8978-1996）中的排放标准；反应时间30 h以上、避免雨淋、不通风、无日照为最佳反应条件。     

城市垃圾焚烧飞灰重金属药剂配伍稳定化实验研究

以飞灰中富含的Pb和Zn为目标重金属,对飞灰中重金属药剂配伍稳定化效果了实验研究.选用EDTA、Na2S、NaH2PO4等稳定化药剂和pH值控制,首先将试剂单独投加飞灰中测定重金属浸出浓度,分析各试剂的稳定化效果;然后通过系列试验观察现象,确定试剂最优投加顺序;最后,按照试剂性质制定4个配伍方案,按照最优投加顺序投加试剂,测定分析各个配伍方案的稳定化效果.结果表明:pH值保持在弱碱性(10左右),重金属稳定化效果较好.EDTA二钠、NaH2PO4和Na2S重金属稳定化效果明显,而有机试剂EDTA二钠稳定化效果明显优于NaH2PO4和Na2S;稳定化药剂投加顺序以Na2S、EDTA二钠、NaH2PO4顺序投加处理效果为最佳;配伍方案4处理效果明显优于其他方案,可以实现稳定化药剂配伍相合,提高飞灰中重金属稳定化效果,同时减少有机螯合剂的使用量,从而降低处理成本.     

Evaluation of trichloroethene recovery processes in heterogeneous aquifer cells flushed with biodegradable surfactants

The ability of two biodegradable surfactants, polyoxyethylene (20) sorbitan monooleate (Tween 80) and sodium dihexyl sulfosuccinate (Aerosol MA), to recover a representative dense non-aqueous-phase liquid (DNAPL), trichloroethene (TCE), from heterogeneous porous media was evaluated through a combination of batch and aquifer cell experiments. An aqueous solution containing 3.3% Aerosol MA, 8% 2-propanol and 6 g/l CaCl(2) yielded a weight solubilization ratio (WSR) of 1.21 g TCE/g surfactant, with a corresponding liquid-liquid interfacial tension (IFT) of 0.19 dyn/cm. Flushing of aquifer cells containing a TCE-DNAPL source zone with approximately two pore volumes of the AMA formulation resulted in substantial (>30%) mobilization of TCE-DNAPL. However, a TCE mass recovery of 81% was achieved when the aqueous-phase flow rate was sufficient to displace the mobile TCE-DNAPL toward the effluent well. Aqueous solutions of Tween 80 exhibited a greater capacity to solubilize TCE (WSR=1.74 g TCE/g surfactant) and exerted markedly less reduction in IFT (10.4 dyn/cm). These data contradict an accepted empirical correlation used to estimate IFT values from solubilization capacity, and indicate a unique capacity of T80 to form concentrated TCE emulsions. Flushing of aquifer cells with less than 2.5 pore volumes of a 4% T80 solution achieved TCE mass recoveries ranging from 66 to 85%, with only slight TCE-DNAPL mobilization (<5%) occurring when the total trapping number exceeded 2 x 10(-5). These findings demonstrate the ability of Tween 80 and Aerosol MA solutions to efficiently recover TCE from a heterogeneous DNAPL source zone, and the utility of the total trapping number as a design parameter for a priori prediction of DNAPL mobilization and bank angle formation when flushing with low-IFT solutions. Given their potential to stimulate microbial reductive dechlorination at low concentrations, these surfactants are well-suited for remedial action plans that couple aggressive mass removal followed by enhanced bioremediation to treat chlorinated solvent source zones.     

Chloroaromatic pollutants in mussels incubated in two finnish watercourses polluted by industry

Concentrations of different chlorinated compounds were measured in mussels incubated in two polluted watercourses, a river (the River Kymijoki) and a lake (Lake Vanaja) for four weeks in summer 1995. The sum concentrations of polychlorinated phenols (PCP) and biphenyls (PCB) were both about 1 μg/g lipid weight (lw) in Lake Vanaja mussels, while in the River Kymijoki mussels PCPs were non-detectable and PCBs were measured 120 ng/g lIw. The concentrations of toxic polychlorinated dibenzo-p-dioxin (PCDD) and dibenzofuran (PCDF) congeners ranged between <17 and 370 pg/g Iw in Lake Vanaja mussels and between <38 and 11,000 pg/g lw in the River Kymijoki mussels. Polychlorinated diphenyl ethers (PCDE) were detected in the mussels incubated in the River Kymijoki (0.4–1.1 ng/g Iw), but not in those incubated in Lake Vanaja. Polychlorinated phenoxyanisoles (PCPA) were measured 33 ng/g lw and polychlorinated phenoxyphenols (PCPP) 300 ng/g lw in the mussels incubated in the River Kymijoki. PCPAs were also detected in reference samples, which were sediment and pike from the River Kymijoki and Baltic salmon, seal and white-tailed sea eagle.     

The variation of street air levels of PAH and other mutagenic PAC in relation to regulations of traffic emissions and the impact of atmospheric processes

The occurrence of particle associated PAH and other mutagenic PAC was determined in 1996 in the street air of Copenhagen. In addition, particle extracts were tested for mutagenicity. The measurements were compared with previous measurements in 1992/1993. The levels had decreased in this period. The decrease was caused by an implementation of light diesel fuels for buses and the exchange of older petrol-driven passenger cars with catalystequipped new ones. About 65% of the reduction was caused by the application of the light diesel fuels. Under special conditions, chemical processes in the atmosphere produced many more mutagens than the direct emissions. The concentrations of S-PAC and N-PAC were 10 times lower than those of PAH, while the levels of oxy-PAH were in the same order of magnitude as those of PAH. Benzanthrone, an oxy-PAH, is proposed to be formed in the atmosphere in addition to direct emissions. Benzo(a)pyrene, often applied as an air quality criteria indicator, was photochemically degraded in the atmosphere. A strong increase in the mutagenic activities was observed to coincide with a depletion of benzo(a)pyrene.     

Teratological effects of pesticides in vertebrates: a review

Abstract

In the last decades, the use and misuse of pesticides in the agriculture have increased, having a severe impact on ecosystems and their fauna. Although the various effects of pesticides on biodiversity have been already documented in several studies, to our knowledge no consistent overview of the impact of pesticides in vertebrates, both terrestrial and aquatic, is available. In this review, we try to present a concise compilation of the teratogenic effects of pesticides on the different classes of vertebrates – mammals, birds, reptiles, amphibians and fish.     

Book review

The Pesticide Manual ‐ A World Compendium, 8th Edition, C.R. Worthing, Editor and S.B. Walker, Assistant Editor, British Crop Protection Council, BCPC Publications Sales, Bear Farm, Binfield, Bracknell, Berkshire RG12 5QE, England. 1987, 1100 pp., UK £50; Overseas £56. ISBN 0–948404–01–9.