BH1型混凝脱色剂处理针织印染废水的实验研究

采用新研制的BH1型混凝脱色剂对针织印染废水的脱色和COD去除效果进行了实验研究。结果表明,BH1型混凝脱色剂的最佳pH为8,最佳投药量为1．2ml／L,此时COD、色度去除率分别为64％、89％,与硫酸铝、硫酸亚铁等常规混凝剂相比,COD、色度的去除率均有明显提高,其中处理后出水的色度迭40倍以下,色度可满足《污水综合排放标准》（GB8978—1996）表4中的一级标准。     

Effects of nature organic matters and hydrated metal oxides on the anaerobic degradation of lindane,p,p''''-DDT and HCB in sediments

IntroductionLindane ,p,p’ DDTandHCBaresemivolatileandlipophilic ,andtheyfallintotheclassofcompoundsdescribedaspersistentorganicpollutants.Moreover,thesecompoundshavebeenidentifiedaspotentendocrinedisrupters(Smith ,2 0 0 2 ;Willett,1 998;Robert,2 0 0 1 ) .Ithasbeenreportedchlorinatedorganiccompoundscanbedecomposedveryslowlyinsedimentsthroughvariousreactions(Niesl,1 990 ) .Factorsinfluencingthebiodegradationofcompoundsarevarious.Amongthem ,itwasreportedthattheeffectsofnaturalorganicmatters…     

Enhanced mixing state of black carbon with nitrate in single particles during haze periods in Zhengzhou, China

Black carbon（BC） plays an important role in air quality and climate change, which is closely associated with its mixing state and chemical compositions. In this work the mixing state of BC-containing single particles was investigated to explore the evolution process of ambient BC particles using a single particle aerosol mass spectrometer（SPAMS） in March 2018 in Zhengzhou, China. The BC-containing particles accounted for 61.4% of total detected ambient single particles and were classified into f...     

HSE体系中环保管理在异常作业过程的实践

分析检修异常作业过程中实施重要环境因素识别,进行环保排污申报与审批的重要性.为加强环保全过程管理提供参考和借鉴.     

Impact of soluble organic matter and particulate organic matter on anammox system: Performance,microbial community and N2O production

In this study,the effects of soluble readily biodegradable COD (sCOD) and particulate slowly biodegradable COD (pCOD) on anammox process were investigated.The results of the longterm experiment indicated that a low sCOD/N ratio of 0.5 could accelerate the anammox and denitrification activity,to reach as high as 84.9%±2.8% TN removal efficiency.Partial denitrification-anammox (PDN/anammox) and denitrification were proposed as the major pathways for nitrogen removal,accounting for 91.3% and 8.7% o...     

Effects of disinfection efficiency on microbial communities and corrosion processes in drinking water distribution systems simulated with actual running conditions

The effects of disinfection efficiency on microbial communities and the corrosion of cast iron pipes in drinking water distribution systems (DWDSs) were studied. Two annular reactors (ARs) that simulated actual running conditions with UV/Cl₂ disinfection and chlorination alone were used. High chlorine consumption and corrosion rate were found in the AR with UV/Cl₂. According to functional genes and pyrosequencing tests, a high percentage of iron recycling bacteria was detected within the biofilm of the AR with Cl₂ at early running stage, whereas siderophore-producing bacteria were dominant in the biofilm of the AR with UV/Cl_2. At the early running stage, the sequential use of UV light and an initial high chlorine dosage suppressed the biomass and iron-recycling bacteria in both bulk water and biofilms, thereby forming less protective scales against further corrosion, which enhanced chlorine consumption. Non-metric multidimensional scaling analysis showed that the bacterial communities in the ARs shaped from within rather than being imported by influents. These results indicate that the initial high disinfection efficiency within the distribution system had not contributed to the accumulation of iron-recycling bacteria at the early running stages. This study offer certain implications for controlling corrosion and water quality in DWDSs.     

Role of hydrogen bond capacity of solvents in reactions of amines with CO2: A computational study

Various computational methods were employed to investigate the zwitterion formation,a critical step for the reaction of monoethanolamine with CO₂,in five solvents(water,monoethanolamine,propylamine,methanol and chloroform) to probe the effect of hydrogen bond capacity of solvents on the reaction of amine with CO₂ occurring in the amine-based CO₂ capture process.The results indicate that the zwitterion can be formed in all considered solvents except chloroform.For...     

二噁英分析检测方法研究进展及展望

二噁英是系列多氯代二苯并二噁英和多氯代二苯并呋喃的总称,是广泛存在于几乎整个生态系统如空气、土壤、底质、生物体中的一组剧毒致癌物质.它们通过各种燃烧过程、化学制造、工业生产等途径进入环境,并在环境中长期滞留和生物体内富集,给人类带来一系列毒副作用:如生殖、生长毒性、内分泌毒性、免疫抑制作用以及致癌性.本文首先对二噁英进行概述,并对其污染状况进行分析.在此基础上,阐述了二噁英分析方法的研究进展,最后论述了中国二噁英检测的进程.中国二噁英研究任重而道远,仍为今后研究重点和热点.     

太阳能电池生产废水处理工程设计

太阳能电池作为一种清洁能源,应用越来越广泛,然而其生产废水中因含有大量F-及酸碱物质,腐蚀性强,治理困难。采用石灰乳+CaCl2+PAC混凝沉淀工艺处理太阳能电池生产废水。工程设计规模为浓含氟废水7 m3/d、稀含氟废水200 m3/d、酸碱性废水200 m3/d、含IPA废水1 m3/d,经过3个多月的调试运行,出水中ρ(COD)≤500 mg/L,ρ(BOD5)≤300 mg/L,ρ(SS)≤400 mg/L,pH保持在6～9,ρ(F-)≤20 mg/L,达到GB 8978—1996《污水综合排放标准》三级标准。废水处理工艺紧凑,处理效果好、运行稳定、具有推广价值。