酸析及混凝法处理切削废水研究

采用酸析、混凝、酸析-混凝联合法处理切削废水,并在优化的参数条件下对比了3者的处理效果。综合结果表明,酸析-混凝联合处理最为理想,因此酸析-混凝联合法具有经济、高效的优势

Research on the Feasibility of Using Coagulation-filtration to Treat Living Wastewater for Green Land Irrigation

通过小型模拟试验,研究采用“混凝过滤”方法处理后的生活污水浇灌园林绿地后,对绿地植物生长及环境安全产生的影响。研究表明:生活污水经混凝过滤去除悬浮物后浇灌绿地,不但补充了水分,还为植物提供了一定的营养成分,使植物生长茂盛。生活污水经过80 cm厚的土壤层净化后,其悬浮物、氨氮、无机磷、有机物(CODCr)的去除率分别为84%、97%、90%、68.7%,下渗水的浊度平均为0.5 NTU,氨氮、磷酸盐、有机物(CODCr)平均浓度分别为0.4 mg.L-1、0.06 mg.L-1、13.7 mg.L-1,不会对地下水造成污染。The feasibility of using living wastewater treated by the way of coagulation-filtration to irrigate the green lands was studied in this paper.It was found the water filtered by an 80-cm-thick soil layer was substantially purified.97% NH~+_4-N and 74% COD_(Cr) were removed resulting in an average final concentration of 0.4mg/L NH~+_4-N,13.7 mg·L~(-1) COD_(Cr),0.06 mg·L~(1) phosphate,and 0.5 NTU nephelometery,which was acceptable to the receiving levels of underground water.From the point of water resources recycling,this method is a promising way to reuse living wastewater for green land irrigation

STUDY ON THE ADVANCED TREATMENT of DYE WASTEWATER USING IRON-CARBON INTERNAL ELECTROLYSIS

采用内电解法对经过生化处理后仍不能达标的印染废水进行深度处理实验,结果表明:当PH维持在4左右,反应时间控制在16MIn左右时,出水投加CA(OH)2约2g/l混凝沉淀,则废水的色度去除率可达87.5%,COd的去除率也可达到50%~80%,处理后的出水完全达到gb8978-1996《污水综合排放标准》一级标准的要求。After being treated by biological method,the dye wastewater can not meet the national standard,so internal electrolysis is used as a follow-up treatment of biochemical treatment.It is analyzed the relationship between removal rate and those factors such as the pH,time and coagulation dosage.When pH=4,Ca(OH)_2 dosage is 2g/L,the decoloring rate can be 87.5% and the removal rate of COD is 50%--80%.The effluent can meet the filst-order of" Waste water Integrated discharge Stand"

Study on Treatment of the Electronics Industry Cleaning Wastewater by Potassium ferrate oxidation

电子工业清洗废水是较难生物降解的工业污水之一,因此,须采用其他方法对其进行处理。文章通过室内烧杯试验研究了采用高铁酸钾氧化法处理该种废水的影响因素和方法,当该种废水的COd浓度在500~800Mg/l范围内时,调整废水PH=2左右,投加量高铁酸钾3g/l左右,并分次投加,则当反应时间超过30MIn后,其COd的去除率可达40%左右,且效果稳定。活性炭吸附可以进一步去除高铁酸钾反应出水的COd,当活性炭投加量高于10g/l,吸附反应5H时,出水COd低于100Mg/l,符合排放标准。Electronic industry cleaning wastewater is more difficult one of biodegradable industrial wastewater.Therefore,it is necessary to adopt other methods to deal with it.This study investigated the influence factors and methods of treating the kind of water by potassium ferrate oxidation through the indoor experiment by the beaker.When the COD concentration of the kind of wastewater is between 500～800mg/L,adjusting the wastewater pH=2 or so,adding the amount of potassium ferrate with 3g/L or so,fractionated dosing,and then sustaining the reaction time of more than 30min,its COD removal rate is up to about 40% with the effect of stability.The potassium ferrate reaction effluent COD can be further removed by activated carbon adsorption.When the dosage of activated carbon was higher than 10g/L and the reactionb time was 5h,the effluent COD was below 100mg/L which met emission standar

Content and partitioning and study on removal technology of heavy metals in tentative dredged sediments of Xiamen western harbor

着重研究了厦门西海域拟疏浚物中重金属的含量和赋存形态,探讨了化学试剂浸提和曝气法去除重金属的可行性,为建立后续的去污染方案提供科学依据。厦门西海域拟疏浚物枯洪两季沉积物中重金属含量变化不大,枯季稍高于洪季。从经济角度考虑,选用C2H2O4、(nH4)2C2O4、EdTA作为浸提剂结合曝气和TClP翻转实验对厦门西海域代表性拟疏浚物样品(X5站位)进行了重金属去除试验。结果表明,几种溶剂中,C2H2O4的效果最好;在相同溶剂条件下,对多数重金属元素,曝气处理可以有效地提高去除率。Total content and partition of heavy metals in the tentative dredged sediments of Xiamen western harbor were studied with the aim to development of conventional decontamination technology.The chemical extraction repair heavy metals polluted soil used the chemical medicament to exchange hydronium,dissolve(in acid or alkali) and complexation.The variety of content of heavy metals in Xiamen western harbor is not evident between dry season and rain season,content of heavy metals in dry season is comparatively higher.This experiment consider from economical,choose ammonium oxalate,oxalic acid and EDTA as the chemical medicament,combining aeration and TCLP upturning,carry though attempt on removing the heavy metals of X5 sample station of Xiamen western harbor.The results showed that the effect of oxalic acid is the best of several chemical medicaments.Using the same chemical medicament,remove the heavy metals much more effective with aeration for most heavy metals

Study on Treatment of Pinellia ternata Soaking Wastewater Using Fenton Reagent

采用Fenton试剂对半夏泡制废水进行氧化处理试验,结果表明:不同的反应温度、H2O2和FeSO4·7H2O的投加量,以及不同的反应时间条件下,Fenton试剂对半夏泡制废水的氧化处理效果不同。当反应条件控制在水温60℃、H2O2投加量50mL/L、FeSO4·7H2O投加量2.80g/L、反应时间8h时,CODCr为9155mg/L的废水,去除率达71.3%,处理效果较为理想。An experiment of Pinellia ternata soaking wastewater treatment using Fenton reagent was carried out,the results showed that effects of Fenton reagent on oxidation treatment of Pinellia ternata soaking wastewater were different under different conditions,including different temperature,reaction time,dosage of H2O2 and FeSO4·7H2O. When water temperature and reaction time were controlled at 60 ℃ and 8 h,and dosage of H2O2 and FeSO4·7H2O were controlled 50 mL/L and 2. 80 g/L,the concentration of CODCr in the wastewater was 9 155 mg/L,and the removal rate of CODCr was 71.3%,the treatment effect was perfect

EXPERIMENTAL RESEARCH ON TREATMENT of DOMESTIC WASTEWATER WITH COAGULANTS IN SBR

分别向按A/O方式运行的Sbr反应器中投加一定量氯化铁、硫酸铝、聚合氯化铝,考察这3种金属盐混凝剂强化活性污泥系统处理生活污水的效果。结果表明,这3种混凝剂的化学辅助除磷效果较好,其中,在100Mg/l(以进水量计)的投加量下,投加氯化铁和硫酸铝的强化处理系统对TP的平均去除率比空白组分别提高了65.52%和69.95%。对有机物的去除也有一定强化作用,对氮的强化处理效果不明显,但可提高活性污泥沉降性能。Based on the SBR reactor running with the A/O process,the effect of enhancing activated sludge system adding coagulants(ferric chloride,aluminum sulfate and poly-aluminum chloride)on treating domestic sewage has been studied.Results showed that the three coagulants were efficient in chemical-aid phosphorus removal.The groups separately adding ferric chloride and aluminum sulfate in dose of 100 mg/L(in influent)gained the additional average removal rates of TP about 65.52% and 69.95%.The three coagulants also strengthened the removal of organic matter and had no great influence on the removal of nitrogen,but could improve the performance of sludge settlement

Performance on phosphorus removal by oyster-shell in a submerged bio-filter

探讨如何提高普通浸没式生物滤池除磷效果为目的 ,采用牡蛎壳为填料 ,通过改变水力停留时间来考察牡蛎壳和陶粒两种填料的浸没式生物滤柱对 CODMn、NH4+ - N以及 PO43 - - P的去除特性。结果表明 ,与陶粒填料相比牡蛎壳填料在对 PO43 - - P的去除方面具有明显的优势 ,牡蛎壳良好的除磷性能主要是通过生物诱导的化学沉淀来实现的。The behavior of phosphorus removal by oyster-shell media was investigated at di fferent HRT and phosphorus concentrations in a submerged bio-filter. The experi ment was carried out in two bio-filter columns packed with oyster-shell and ceramsite media respectively. Both oyster-shell and ceramsite media had sim ilar behavior in the removal of NH 4 +-N and COD\-\{Mn\}, whereas oyster-she ll performed well efficiency in phosphorus removal. It was found that the remova l rate of phosphorus for oyster-shell was up to 70%, which was higher than that (30%) for ceramsite media. It was evidenced that oyster-shell could remove pho sphorus effectively by biologically-induced chemical precipitation

淹没式贝壳填料生物滤池的除磷效应

　探讨了以贝壳为填料的生物滤池的除磷机理,研究了影响除磷效果的主要因素。静态试验结果表明:在酸性条件下贝壳能够通过化学作用去除水中的磷。连续试验结果显示:当控制水力停留时间在5h以上时贝壳显示出较高的除磷效率;当贝壳与陶粒的填充高度之比为2∶1时除磷效果最佳,除磷率可达75%～85%

低龄DDH患儿初次开放复位术中股骨截骨必要性的前瞻性随机对照试验研究方案

回顾性研究发现,股骨截骨术并非低龄DDH患儿手术治疗所必须的,而应根据患儿具体情况合理选择;本研究通过多中心前瞻性研究进一步探讨对于18个月至3岁DDH患儿是否要行股骨截骨术。FSODDH项目为一项多中心前瞻性随机对照临床试验研究。研究设计拟招募200名单侧低龄DDH患儿,随机分成股骨截骨组(n=100)和股骨不截骨组(n=100)。股骨截骨组患儿全部采取髋关节开放复位术、骨盆截骨术及股骨截骨术治疗;股骨不截骨组患儿全部采取髋关节开放复位术及骨盆截骨术治疗;术后定期随访至少2年。收集术前、术后1周、术后1个月、术后3个月、术后6个月、术后1年及术后2年的髋关节正位X线影像资料,比较两组患儿的髋臼指数、股骨头坏死率、再脱位率、术中出血量、手术时间和住院天数等临床指标。这一多中心前瞻性研究将能为低龄DDH患儿是否需行股骨截骨术提供循证医学证据