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1.
聚合硫酸铁改性研究   总被引:3,自引:0,他引:3  
在适宜的制备聚合硫酸铁的条件下考察了助聚剂的种类、用量、反应温度、原料浓度以及存放时间等因素对聚合硫酸铁溶液的全铁含量及盐基度的影响。结果表明:在体系中原料FeSO4质量浓度为30.6%,25℃时加入绿矾质量0.8%的合适的助聚剂,反应2.5h,可提高盐基度近20%,全铁含量不变,产品絮凝性能明显优于未改性聚合硫酸铁PFS及聚丙烯酰胺PAM。  相似文献   

2.
利用钛白粉副产品制备改性聚合硫酸铁   总被引:2,自引:0,他引:2  
以钛白粉副产品硫酸亚铁制备聚合硫酸铁,并在聚合过程中加入改性剂,可以制备不同盐基度的改性聚合硫酸铁,其混凝性能与应用条件优于聚合硫酸铁。  相似文献   

3.
以氧化铁矿为原料,采取直接酸浸溶出,在聚合硫酸铁的基础上制备聚合磷硫酸铁(PFPS).同时比较该絮凝剂和聚合硫酸铁(PFS)絮凝剂对模拟水样的净水效果,结果表明:该絮凝剂的除浊效果、沉降效果等都优于聚合硫酸铁(PFS).  相似文献   

4.
聚合硫酸铁制备若干工艺问题探讨   总被引:3,自引:0,他引:3  
根据聚合硫酸铁制备机理,体系的-pH图探讨了聚合硫酸铁制备工艺中硫酸的添加方式及反应最佳温度两个问题,指出酸度是影响FeⅢ水解和聚合的重要因素,因而制备过程中所投入的硫酸应均匀添加,温度是影响Fe2+催化氧化的重要因素,反应最佳温度为60℃。  相似文献   

5.
对聚合硫酸铁(PFS)的制备及应用进行了阐述。将废硫酸加入到硫酸亚铁中,再添加少量的MnO2做氧化剂,鼓入空气,进行水解氧化,聚合反应得聚铁。PFS是近几年来的新型絮凝剂,主要应用于各种工业废水和城市污水的处理。  相似文献   

6.
题目 (2005年上海高考题)硫酸铁(PFS)是一种新型高效的无机高分子絮凝剂,广泛用于水的处理,现以铁的氧化物为原料来制取聚合硫酸铁,为控制水解时Fe^3+的浓度,防止生成氢氧化铁沉淀,必须先将原料中的Fe^3+还原为Fe^2+,制取步骤如下:  相似文献   

7.
聚合硫酸铁制备新工艺   总被引:2,自引:0,他引:2  
苏毅  王文新 《天中学刊》1998,13(5):27-29
采用硫酸亚铁为原料,空气为氧化剂制备聚合硫酸铁.对多种催化剂新行了筛选,并通过实验确定了配料比、反应温度、催化剂用量、反应时间等最佳反应条件.  相似文献   

8.
以硫酸亚铁为原料,采用过氧化氢一步氧化法制备聚合硫酸铁絮凝剂。研究了新工艺的反应原理、方法,产品的物理化学性能以及该产品在废水处理中的应用。  相似文献   

9.
设计了一种新型的烟气浸出物制备装置,测定烟气浸出物对4种细菌和3种真菌生长的影响.结果表明,在剂量范围内,烟气浸出物均能抑制细菌和真菌的生长.烟气浸出物对铜绿假单孢菌(Pseudom onas aeruginosa),大肠埃希菌(Escherichia coli),枯草芽孢杆菌(Bacillus subtilis)和金黄色葡萄球菌(Staphylococcus aureus)的抑制率分别为97.2%,86.2%,51.5%和81.7%.对爪哇毛霉(Mucor jaranicas),灰葡萄孢(Botrytis cinerea)和白色念珠菌(Canadida albicans)的抑制率分别为95.5%,79.8%和98.9%.所设计的制备装置能有效获得烟气浸出物,可用于烟气浸出物生物学功能分析的标准化研究.  相似文献   

10.
进行了新型聚合硫酸铁的合成实验 ,探索了反应温度、反应时间、硫酸用量、氧化剂用量对反应速率及产品质量的影响 ,并利用自制的聚合硫酸铁对染料废水进行了混凝脱色试验。结果表明 ,在常温常压条件下能生成高分子量的聚合硫酸铁产品 ,试验表明产品的混凝脱色性能良好 ,盐基度在 1 2 .7%~ 1 5 .2 % ,CODCr去除率 >80 % ,脱色率 >72 % ;增加硫酸用量及氧化剂用量 ,都可提高合成反应速率 ,当硫酸与Fe2 + 的摩尔比为 0 .1 4~ 0 .3 2时 ,减少硫酸用量可显著提高产品的盐基度 ,但当该比值小于 0 .1 4时 ,生产过程中将产生大量的氢氧化铁凝胶沉淀 ,导致最终产品的盐基度和铁含量均大幅度降低  相似文献   

11.
以COD、总氰化物为指标,考察了Fenton试剂氧化法去除焦化废水中难降解有机物、氰化物的条件,并将自制的PFAS用于混凝处理,小试结果表明,经过Fenton试剂氧化-混凝技术深度处理的焦化废水,可达到辽宁省污水综合排放标准要求,方法具有实用性。  相似文献   

12.
研究了以聚合硫酸铁(PFS)为主凝剂、高取代度季铵型阳离子化玉米淀粉(HQCC)为助凝剂处理城市生活废水的各种影响因素.实验结果表明:PFS和HQCCS分别以200mg/L和10mg/L的复配浓度、pH值接近中性时混凝效果为最佳,CODCr去除率达到80%,色度与浊度去除率均达99%以上.  相似文献   

13.
采用混凝——微滤组合工艺处理电镀含镍废水,考察了酸碱度、混凝剂用量、过滤速度、停留时间对去除效果的影响,确定较佳工艺条件.结果表明:在pH 9.5,较合适混凝剂投加量为800mg/L;较合适过流速度为90ml/min;较合适停留时间为10min,去除率达97%以上.在上述工艺条件下,实际工业废水的去除率为81.36%,说明本工艺对含镍废水处理具有一定指导意义.  相似文献   

14.
The optimal operation conditions in an anoxic sulfide oxidizing (ASO) bioreactor were investigated. The maximal removal rates for sulfide and nitrate were found to be 4.18 kg/(m3·d) and 1.73 kg/(m3·d), respectively. The volumetrical volumetric loading rates (LRs) observed through decreasing hydraulic retention time (HRT) at fixed substrate concentration are higher than those by increasing substrate concentration at fixed HRT. The sulfide oxidation in ASO reactor was partially producing both sulfate and sulfur; but the amount of sulfate produced was approximately one third that of sulfur. The process was able to tolerate high sulfide concentration, as the sulfide removal percentage always remained near 99% when influent concentration was up to 580 mg/L. It tolerated relatively lower nitrate concentration because the removal percentage dropped to 85% when influent con- centration was increased above 110 mg/L. The process can tolerate shorter HRT but careful operation is needed. Nitrate conversion was more sensitive to HRT than sulfide conversion since the process performance deteriorated abruptly when HRT was decreased from 3.12 h to 2.88 h. In order to avoid nitrite accumulation in the reactor, the influent sulfide and nitrate concentrations should be kept at 280 mg/L and 67.5 mg/L respectively. Present biotechnology is useful for removing sulfides from sewers and crude oil.  相似文献   

15.
对某钣金厂磷化废水采用混凝沉淀法进行处理研究,利用 pH/ORP系统在生产运行中确定了碱和混凝剂的最佳投加量,实现了整个工艺的自动控制,降低了药剂量的使用.结果表明:该法可使原水COD从250mg/L降到50mg/L,总磷从36 mg/L降到0.3mg/L,废水COD和总磷的去除率分别达到80%和99%,达到排放标准.  相似文献   

16.
通过烧杯试验,分别对Al2(SO4)3· 18H2O,Fe2(SO4)3,聚合Al2O3以及1∶1组合无机絮凝剂(Al/Fe)对高浓度垃圾渗滤液的除磷效果进行了研究,结果表明当pH值相同,静沉50min,投药量为700mg/L时,1∶1组合絮凝剂的除磷效率高于单独使用无机絮凝剂,TP去除率为95.12%.处理后出水TP浓度小于1.5mg/L,达到GB16889-2008一级标准.  相似文献   

17.
曝气生物滤池反冲洗污泥的合理处置是其在推广应用中遇到的难题.反冲洗污泥对有机物和浊度有良好的去除效果,但对TP的去除效果甚微;将其与化学混凝剂复配可满足曝气生物滤池进水水质要求,且TP能维持在较低水平.  相似文献   

18.
Coagulation-flocculation process for combined sewage in Shanghai   总被引:1,自引:0,他引:1  
IntroductionaEutrophicationisaseriousprobleminYangtzeestuarybecausesomuchuntreatedcombinedwastewaterisdischargedintotherivereveryday.Thecombinedsewagecontainsorganicsandnutrients.Coagulation-flocculationprocesscanachieveahighefficiencyinremovingorganicsubstancesandphosphates,andcanbeaneconomicalalternativetoafullbiologicaltreat-mentprocess[1].Theaimofapplyingcoagulation-flocculationtreatmentisgenerallytoremovecolloidalmatterinwastewater.Also,nutrientsmayberemovedduringtheprocess.Thephysical-…  相似文献   

19.
Considering that contaminated raw water mostly contains high Ammonia-N and a majority of water treatment plants use prechlorination process in China,efficiency of chloramines as a coagulant aid in enhancing coagulation was investigated by Jar stirring and pilot-scale tests,using Yellow River water containing high concentration of natural organic matters (NOM) and bromide in winter. The jar tests results showed that,compared with no preoxidation,preformed chloramine apparently decreased the turbidity of settled and filtered water with low dosage (2.0 mg/L),and the aid-coagulation efficiency was further enhanced with the increase of chlorine (Cl2) to Ammonia-N (N) ratio. Pilot-scale studies indicated that,in comparison to the case without pre-oxidation,the turbidity removal efficiency of flotation and filtration effluent water was significantly improved,the particle counts of filtered water were decreased 63.4%,the average rate of filter head loss was reduced 18.2%,and filter run time was prolonged 15.7%. Therefore,chloramine preoxidation may substantially enhance the particle separation efficiency.  相似文献   

20.
Automatic coagulant dosage control with streaming current (SC) technique is introduced in this paper. Aluminum and ferric coagulants are widely used in surface water treatment. The SC response characteristics of P-AlCl3 aluminum coagulant and P-FeCl3 ferric coagulant were investigated in this work. Bench-scale water treatment results were obtained from jar tests including rapid mixing, flocculation and undisturbed sedimentation. Results showed that aluminum coagulant is more sensitive than ferric coagulant to SC response.  相似文献   

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