磷肥酸性废水中磷资源的回收利用方法

为回收利用磷肥行业酸性废水中的磷资源,对磷肥废水处理及渣的回收利用方法进行研究。介绍了具体的实验方案、工艺流程、工艺指标控制。结果表明,废水经处理后可达标排放;产生的渣中w(P2O5)≥34%,可以作为白肥或用于生产磷酸,经济效益达470元/t以上,减少了废渣堆存的压力。     

从钛白酸性废水中回收偏钛酸的方法

一种从钛白酸性废水中回收偏钛酸的方法：1）将钛白酸性废水用泵送至高效混凝器，同时加入高效混凝剂聚合硫酸铝和纳米级二氧化钛，搅拌3～8min；2）放入混凝池，停留25～35min；3）用泵送入高效絮凝器中，投入高效絮凝剂聚丙烯酰胺，搅拌3～8min；4）放入偏钛酸浓缩槽，     

利用活性炭处理酸性矿井废水研究

以酸性矿井废水为处理对象,研究了以活性炭作为反应介质的可渗透反应墙(PRB)对其pH的调节效果以及对其COD、SO42-、Cd2+、Cu2+及Zn2+的去除效果。结果表明,活性炭对酸性矿井废水有较好的处理效果,在反应8 h对COD、硫酸根的去除率最高分别可达46.7%、70%;对Cd2+、Cu2+、Zn2+的去除率最高分别可达90%、98.8%、90%,反应200 h对Cu2+的去除率仍有80%。同时对吸附饱和的活性炭进行酸再生,发现再生活性炭对酸性矿井废水也有较好的处理效果。     

扩散渗析法回收硝化棉生产酸性废水

为了探讨回收硝化棉生产酸性废水的可行性,采用扩散渗析法回收某化工厂硝化棉生产酸性废水。考察了流速、流量比、酸度、温度等因素对酸回收及COD分离效果的影响。结果表明:处理水量为10 mL/min,在回收液与残液出水流量比为1:1,流速为1.0 m/h,酸度为9.5 g/L,温度为30℃时,酸回收率可达到94.16%,COD截留率可达84.81%。扩散渗析可以实现酸性废水的回收利用和COD的有效分离,具有技术可行性。     

树脂塔再生酸碱废水的回收利用

介绍了焦作煤业（集团）开元化工有限责任公司氯碱生产工艺中树脂塔再生酸碱废水的回收利用经验.     

树脂塔再生废水的分阶段回收利用

介绍了在烧碱系统螯合树脂塔废水回收方面所做的技术改造,实现了废水的分阶段回收利用,达到了降本增效的目的.     

混床再生废水的回收利用

介绍了生产脱盐水过程中混床再生废水分段回收利用的措施。     

氯碱生产工艺中废水回收利用

公司5万t/a氯碱装置产生大量的废水,多年来一直是我公司环保的头疼问题。介绍了采取种种措施将氯碱生产装置中的废水经处理回收再利用,既降低能耗、减少生产成本、增加企业经济效益又达到环保减排的目的。     

从含钪酸性废水中回收氧化钪

1.前言氧化钪(Sc_2O_3)是宇航、激光、彩色显像管、电光源、原子能、超导等高科技领域材料中重要的添加成份,由于钪在矿石中的含量非常低,提取工艺非常复杂,故世界年产量很低,价格十分昂贵。我省有十几家钛白粉厂,年排放含钪(7g/m~3)酸性废水近5×10~4m~3,是极有价值的钪资源。若按氧化钪回收率60%计,每年可回收氧     

乙醛装置的废水回收利用

１概述扬子石化股份有限公司的乙醛装置自德国赫希斯特（ｈｏｅｃｈｓｔ）公司成套引进 ,于１９８９年５月建成投产。生产工艺采用乙烯、氧气为原料 ,在温度为１２５～１３５℃、压力为０ ３～０ ３７ＭＰａ ,催化剂为ＣｕＣｌ２、ＰｄＣｌ２ 的盐酸水溶液中 ,一步氧化成乙醛 ,经过吸收塔加入低硅水吸收其中的乙醛 ,在塔底得到浓度为８%～１３%的粗乙醛 ,未反应的气体（循环气）从塔顶排出经压缩后与原料乙烯混合进入反应器继续反应。粗乙醛送往蒸馏单元 ,经过脱轻组份塔、精馏塔蒸馏 ,得到成品乙醛。从精馏塔底排出的化学废水送往本公司水…     

Electrochemical Regeneration of Zn-Saturated Granular Activated Carbon from Electroplating Wastewater Plant

An electrically assisted regeneration (EAR) process was used to assess the effectiveness of regenerating exhausted granular activated carbon (GAC) preloaded with electroplating wastewater containing hyper Zn concentration at a concentration of 950.5 mg L ^?1  (1.45 × 10 ^?2  mol L ^?1 ). The electrochemical rege-neration process supplied with direct current was controlled at a constant voltage of 5.0 V. Two regeneration methods were tested and compared: first, acid washing (pH 1.0) and, second, electrically assisted acid washing. Results showed that the Zn adsorption capacity of GAC regenerated by EAR was significantly higher than that of GAC regenerated by acid washing. The effectiveness of the Zn desorbing efficiency from GAC was enhanced by electric current in the electrochemical regeneration process. Using the EAR method, a regeneration efficiency of 88.3% was observed for GAC, whereas using acid regeneration, the efficiency was only 25.3%. These observations reveal that EAR could be a potential alternative to acid washing for the regeneration of GAC saturated with Zn.     

吸附-热再生法回收废水中醋酸的研究

针对浓度为3%的醋酸废水,选用YK-15椰壳炭为吸附剂,采用吸附和分步热再生法从废水中分离醋酸,达到了废水处理和醋酸回收的双重目的.系统地考察了动态吸附和分步热再生的工艺条件,结果表明,在温度为30℃,废水流速为7.3×10-5 m·s-1的适宜条件下,YK-15椰壳炭对醋酸的动态吸附容量为161.0 mg·g-1,穿透点处废水的处理能力为4.7 g(废水)·g-1(活性炭).对吸附剂进行分步热再生的适宜条件是,第一步控制温度为110～130℃,脱除吸附柱内35%～40%的残余水,以浓缩醋酸.第二步继续升温至320℃,脱附并回收醋酸,醋酸的脱附率可达96%以上,收率为87%,回收醋酸的浓度为30%左右.吸附–脱附的循环实验表明,活性炭的吸附和脱附性能稳定,数据重现性好.     

水处理活性炭的电化学再生技术研究

选择椰壳水处理活性炭作为吸附剂吸附处理低浓度苯酚废水,在室温条件下,在静止的电化学电极上对吸附苯酚后的活性炭进行电化学再生,探讨了各个操作参数对活性炭的电化学再生效率的影响。实验结果表明,电化学再生活性炭的效率较好,基本没有二次污染。再生效率随着电解质（氯化钠）溶液浓度的增加而增加,但达到１％以后基本没有变化。同时,再生效率随着再生电流的增加而提高,随着再生时间的增加,再生效率亦随之提高,但到５ｈ以后,再生效率基本不随时间的变化而变化。     

活性炭吸附法脱除废水中的苯酚及吸附剂再生的研究

对活性炭对废水中苯酚的吸附平衡以及活性炭的再生进行了试验性研究和理论性探讨。结果发现,温度对活性炭的吸附能力有显著的影响,低温地吸附有利,吸附平衡可用Ｌａｒｇｍｕｉｒ方程描述;ＰＨ值对活性炭对苯酚捐附也有较强的影响,酸性的水溶液对吸附有利,强碱性水溶液对再生有利。分别采用乙醇、丙酮、ＮａＯＨ溶液、ＮａＯＨ溶液＋乙醇的混合液对吸附剂活性炭进行再生,再生率均能达到８５％以上,基本满足工业要求。     

Adsorption Characteristics of Polyvinylpyridine and Activated Carbon for Lactic Acid Recovery from Fermentation of Lactobacillus delbrueckii

ABSTRACT

Polyvinylpyridine (PVP) and activated carbon were examined for the adsorption characteristics pertinent to their application in lactic acid fermentation. For PVP the linear adsorption constant, K_ad , was between 0.7 and 1.0 for an equilibrium pH range of 3 to 9. The pH was adjusted by acid/base addition, similar to pH control in fermentation. The values of K_ad> in the pH-adjusted systems were much lower than that reported for pure lactic acid solutions, i.e., about 9.7. Furthermore, no clear effect of pH was observed. These are attributed mainly to the competition of anions (Cl～ and lactate) for the adsorption sites of protonated pyridinal N. Its adsorption capacity was also found to decrease with the base regeneration (by about 14% each time) after being contacted with the culture broth. These limit its potential application in lactic acid fermentation. Activated carbon was much more effective in lactic acid/lactate adsorption than PVP. At pH 5.5 (optimal for fermentation), the value of K_ad of activated carbon was about 7. The adsorption further favored lower pH under acid (HC1) addition. Activated carbon has been reported to adsorb glucose. However, the presence of glucose in 0–70 g/L was found in this study to have an insignificant effect on lactate adsorption. Cells of Lactobacillus delbrueckii also adsorbed rapidly on activated carbon. This cell adsorption had a negative effect on lactate adsorption.     

微生物-化学耦合法再生活性炭的研究(英文)

In this study,spent activated carbon(AC) saturated with caramel was regenerated by using yeast and NaOH.The efficiency of regeneration was evaluated under parameters such as amount,treatment time,temperature,pH value,stirring temperature of yeast and NaOH concentration.The optimum condition for AC regeneration was 8 h for yeast treatment time,35 ℃ for 0.075% yeast culture temperature,a pH value of 6 for the yeast dealing with the spent AC,90 ℃ for NaOH stirring temperature of AC and 6% NaOH for washing after the spent AC was treated by yeast.Under these conditions,methylene blue(MB) adsorption was 213 mg·g-1 in comparison with 60 mg·g-1 of spent AC.The micro structure and surface area of the regenerated AC were characterized by scanning electron mi-croscope(SEM) and N2 sorption,respectively.The pore size distributions of virgin and regenerated AC were ana-lyzed by means of H-K equation,resulting in a mean pore diameter of 1.28 nm and a pore volume of 1.13 cm3·g-1.This study provides data for theoretical support of the AC regeneration technology.     

焦化废水吸附饱和活性炭的超声波再生研究

浸没式超滤配合粉末活性炭工艺对焦化废水二级生化出水进行深度回用处理,饱和的活性炭采用超声波技术进行再生后重复使用,研究考察以自来水、焦化废水二级生化出水做再生介质的情况下,再生时间、超声波频率对活性炭再生效果的影响,结果表明,自来水再生介质下,活性炭可以达到50%左右的再生效果,而利用焦化废水作为再生介质最多只能达到16%左右的再生效果,但通过与自来水配水,可以达到活性炭脱附再生目的,当焦化废水与自来水体积比为1∶3时,再生率可以达到36%左右,在一定程度上降低了活性炭再生的成本。     

活性炭再生技术

介绍了几种活性炭再生的主要方法:热再生法、化学药品再生法、电化学再生法、光催化再生法超临界萃取再生法和生物再生法,论述了电化学再生法和超临界萃取法的再生机理,最后指出光催化再生法和临界或亚临界液态水脱附再生法的发展潜力。     

活性炭的再生方法

介绍了几种废活性炭的再生方法,主要有电化学再生法、超声波再生法、催化湿式氧化再生法、微波辐射再生法、超临界流体再生法。对影响活性炭再生效率的因素进行对比探讨。     

自来水厂生产废水的回收与利用研究

水资源的合理利用和循环利用,就是自来水厂要提高运营能力,以做到水资源的高效利用,还要将循环经济理念注入其中,将所产生的废水经过技术处理后回收利用,以减少废水的产出。针对南坑水厂生产废水的回收与利用展开研究。