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52.
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用硝酸银滴定法测定水中氯离子时,存在S~2-、SO_3~2-、S_2_O_3~2-的干扰,原用H_2O_2消除干扰,但滴定到达终点后,颜色不太稳定,为此,我们采用过硫酸钾氧化法进行消除干扰的试验。实践证明,该方法对消除上述干扰物是可行的,对测定石油勘探开发废水中氯离子时消除干扰是适用的。 相似文献
54.
The mechanochemical dechlorination of pentachlorophenol (PCP) was studied using CaO and SiO2 powder as additives. The e ects
of the milling time and additives on the dechlorination rate were investigated. The resulting product was characterized by X-ray
di raction (XRD), Fourier transform infrared spectra (FT-IR), thermogravimetric analysis (TG) and ion chromatography (IC). It is
found that grinding operation could dechlorinate PCP, with the formation of inorganic chloride and amorphous carbon. The addition
of quartz to the grinding mixture facilitated dechlorination. On the basis of the experimental results, the decomposition mechanism
was proposed. Decomposition predominantly proceeds through rupture of C–Cl bond in PCP molecule, followed by the formation of
inorganic chlorides. 相似文献
55.
Dissolved organic matter(DOM) has been identified as precursor for disinfection by-products(DBPs) formation during chlorination. Recently,it has been demonstrated that the characteristics of DOM influence the DBPs formation mechanism. A study was,therefore,initiated to investigate the effects of DOM fractions on DBPs formation mechanism. In the chlorination process,organic acids are dominant precursors of total thihalomethanes(TTHM) because of the νC-O and unsaturated structures. Furthermore,the TTHM format... 相似文献
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乙基氯化物是重要的农药中间体,广泛用于生产高效低毒有机磷农药,在生产过程中产生大量高COD、高磷、高硫等污染物的有毒废水。文章针对该废水的水质,提出了一种新的预处理工艺:吹脱-Fenton氧化-沉淀反应。试验结果表明:当吹脱时间为20 min,pH为3.10,Fenton反应双氧水与亚铁离子摩尔比为4:1,双氧水投加量为5 mL/L以及沉淀反应石灰投加量为14.5 g/L时,废水中的COD从228 g/L降低到56.60 g/L,硫离子浓度从88.94 g/L降低到12.26 g/L,总磷含量从10.37 g/L降低到0.98 g/L。 相似文献
58.
Al13 or Alb is usually regarded as the most efficient species of polyaluminum chloride(PAC), the performance flocculant for water treatment. This paper was intended to report a new method to synthesize PAC with high content Alb, by using the membrane reactor. NaOH solutions were managed to permeate slowly through the micropores of ultrafiltration membrane into AlCl3 solutions under the suitable transmembrane pressure(TMP). Meanwhile NaOH drops size was limited to nano-scale, resulting in dramatical reduction of the characteristic diffusion time and great increment of contact interface between the strong base and AI ions in solution to favor the formation of Al(OH)4^-, the precursor of AI,3, so few precipitates and much Alb are produced. When the initial concentration of AlCl3/NaOH is 0.40/2.0 (mol/L), MWCO = 10000, TMP = 0.0085 MPa, T= 305 K and B(molar ratio of OH^-/Al^3 ) = 2.25, the quantity of Alb attains about 80%. The results of ^27Al-NMR determination showed that the Al13 content is equal to Alb content. And our PAC product has shown better flocculation effects than the commercial product. 相似文献
59.
在氯碱工业加工过程中会产生大量的甲烷氯化物废水,废水中含有大量的甲烷氯化物,该类废水不易处理,极大地影响了后续废水处理工作的开展。本文以某司甲烷氯化物具体试验为例,探讨高分子吸附剂在甲烷氯化物废水处理过程中的应用,在利用高分子吸附剂进行吸附的同时通过蒸汽吹脱使树脂中富集下来的甲烷氯化物得到分离回收,从而实现了废水的资源化,达到治废与资源利用的双重效果。 相似文献
60.