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A lagoon in the New Binhai District, a high-speed developing area, Tianjin, China, has long been receiving the mixed chemical
industrial wastewater from a chemical industrial park. This lagoon contained complex hazardous substances such as heavy metals
and accumulative pollutants which stayed over time with a poor biodegradability. According to the characteristics of wastewater
in the lagoon, the micro-electrolysis process was applied to improve the biodegradability before the bioprocess treatment.
By the orthogonal experimental study of main factors influencing the efficiency of the treatment method, the best control
parameters were obtained, including pH=2.0, a volume ratio of Fe and reaction wastewater of 0.03750, a volume ratio of Fe
and the granular activated carbon (GAC) of 2.0, a mixing speed of 200 r/min, and a hydraulic retention time (HRT) of 1.5 h.
In the meantime, the removal rate of chemical oxygen demand (COD) was up to 64.6%, and NH4
+-N and Pb in the influent were partly removed. After the micro-electrolysis process, the ratio of biochemical oxygen demand
(BOD) to COD (B/C ratio) was greater than 0.6, thus providing a favorable basis for bioprocess treatment. 相似文献
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The technique of micro-electrolysis-contact oxidization was exploited to treat chitin-producing wastewater. Results showed that Fe-C micro-electrolysis can remove about 30% CODcr, raise pH from 0.7 to 5.5. The CODcr removal efficiency by biochemical process can be more than 80%. During a half year's operation, the whole system worked very stably and had good results, as proved by the fact that every quality indicator of effluent met the expected discharge standards; which means that chitin wastewater can be treated by the technique of micro-electrolysis, contact oxidization. 相似文献
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应用PSB处理黄姜皂素废水的试验研究 总被引：1，自引：0，他引：1
皂素废水是一种酸度高、色度大、可生化性差的工业有机废水,利用光合细菌处理黄姜皂素生产废水并对影响因素进行试验研究的结果表明,在预处理后的废水中添加4．0‰酵母膏,pH7．5,接种量30％,光照条件2000Lx,温度30℃环境下处理6d,CODcr去除率最高。 相似文献
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进行了海绵铁内电解法作为印染废水预处理工艺的试验研究,试验结果表明：在pH=5-6、海绵铁投加量50g/L、反应时间60min及一定的搅拌强度条件下,可去除40%左右的色度、30%左右的COD,废水可生化性得到有效改善。研究表明,海绵铁内电解工艺用于印染废水预处理效果良好,具有一定的推广价值。 相似文献
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INTRODUCTIONInordertogetpliableandelegantterylenefabricjustlikesilk,terylenegreigeclothisalwayspretreatedwithalkali-decompositionprocesswh-ereinterylenegreigeclothishydrolyzedtosomeextentinNaOHsolutionatcertaintemperature(T)andpressure.Duringthisprocess,thesuperficialterylenefibreispeeledofffromtheclothanddis-solvedintosolution,inwhichteryleneacid(TA)andethyleneglycolaredischargedaspollutantsinwastewater.Theobtainedterylenefabricwithsi-lkenwrinkleandsoftfeelingiscalledartificialsilkfabr… 相似文献
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Aerobically activated sludge processing was carried out to treat terylene artificial silk printing and dyeing wastewater (TPD wastewater) in a lab-scale experiment, focusing on the kinetics of the COD removal. The kinetics parameters determined from experiment were applied to evaluate the biological treatability of wastewater. Experiments showed that COD removal could be divided into two stages, in which the ratio BOD/COD (B/C) was the key factor for stage division. At the rapid-removal stage with B/C>0.1, COD removal could be described by a zero order reaction. At the moderate-removal stage with B/C<0.1, COD removal could be described by a first order reaction. Then Monod equation was introduced to indicate COD removal. The reaction rate constant (K) and half saturation constant (KS) were 0.0208-0.0642 L/(gMLSS)·h and 0.44-0.59 (gCOD)/L respectively at 20 ℃-35 ℃. Activation energy (Ea) was 6.05×104 J/mol. By comparison of kinetic parameters, the biological treatability of TPD wastewater was superior to that of traditional textile wastewater. But COD removal from TPD-wastewater was much more difficult than that from domestic and industrial wastewater, such as papermaking, beer, phenol wastewater, etc. The expected effluent quality strongly related to un-biodegradable COD and kinetics rather than total COD. The results provide useful basis for further scaling up and efficient operation of TPD wastewater treatment. 相似文献
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通过对铁碳微电解工艺中的进水p H值、铁碳比、反应时间、温度及进水COD深度因素进行实验研究,找出最佳铁碳微电解预处理工艺的控制点。实验结果表明,在进水p H值为2,铁碳比为1：2,反应时间为2 h的反应条件下,铁碳微电解法对试验所用废水的处理最为有效,CODCr去除率在64%以上,且不随进水浓度和温度的波动而变化;且出水p H值有明显的提高,为后续工序创造了有利条件。 相似文献
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This paper describes the removel of COD and nitrogen from wastewater with modified sequencing batch biofilm reactor,The strategy of simultaneous feeding and draining was explored.The results show that introduction of a new batch of wastewater and withdrawal of the purifeid water can be conducted simultaneously with the maximum volumetric exchange rate of about 70%,Application of this feeding and draining mode leads to the reduction of the cycle time,the increase of the utilization of the reactor volume and the simplification of the reactor structure.The treatment of a synthetic wastewater containing COD and nitrogen was investigated.The operation mode of F(D)-O(i.e.,simultaneous feeding and draining followed by the aerobic condition)was adopted.It was found that COD was degraded very fast in the initial reaction period of time,then reduced slowly and the ammonia nitrogen and nitrate nitrogen concentrations decreased and increased with time respectively,while the nitrite nitrogen level increased first and then reduced.The relationship between the COD or ammonia nitrogen loading and its removal rate was examined,and the removal of COD,ammonia nitrogen and total nitrogen could exceed 95%,90%and 80% respectively,The fact that nitrogen could e removed more completely under constant aeration(aerobic condition)of the SBBR operation mode is very interesting and could be explained in several respects. 相似文献
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采用静态吸附法研究活性炭和硅藻土对3种实验废水在不同吸附条件下(吸附剂量、时间、pH值)的吸附效果。结果表明活性炭在投加量为40 g/L,振荡时间为1 h,无机、有机、混合样品pH分别为4、6、10时,可使样品色度和COD去除率达到最佳效果;硅藻土在投加量为30 g/L,振荡时间为20 min时,无机、有机、混合样品pH分别为8、4、4时,可使废水COD去除率达50%以上,但色度去除效果较差。实验表明硅藻土和活性炭串联吸附为较优方案。 相似文献
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聚合氯化铝铁(PAFC)处理电镀废水的研究 总被引：1，自引：0，他引：1
采用PAFC处理电镀废水并与聚合氯化铝(PAC)和聚合氯化铁(PFC)处理效果进行对比实验,结果表明,PAFC兼有PAC和PFC的优点,形成的絮凝体大而实且沉降速度快。其除水色度比PFC好,除浊效果和絮凝体沉降性能又优于PAC。PAFC可以显著提高去除电镀废液色度的絮凝效果,可以提高Cr6 的去除率,且用量少,适用的pH范围也更广。 相似文献
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INTRODUCTION Coking wastewater is generated in the produc- tion of coke, coal gas, tar and other coke by-products The coking wastewater includes inorganic pollutants such as ammonia, cyanogen, sulfocyan, heterocycle compounds and polycyclic aromatic compounds such as phenol, oils, naphthalene, pyridine, quinoline and anthracites, which are difficult to biodegradation under aerobic conditions (Ganczarczyk, 1972). Dis- charge of coking wastewater to the environment may cause severe contamin… 相似文献
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It is difficult to treat 2-amino-thiazoline- 4-carboxylic acid (ATC) waste liquid effectively at present for its characteristics of high chemical oxygen demand (COD), high salinity and low biodegradability. In order to solve this problem, this paper presents several kinds of physical-chemical treatment unit techniques, including acid separation, catalytic oxidation and coagulation. First of all, acid separation was adopted to precipitate relevant organics at isoelectric point. When the temperature and pH value of acid separation were controlled at about 5 ℃ and 2.2 respectively, the COD removal rate could reach 27.6%. Secondly, oxidation was used to break chemical constitution of refractory organics. The optimal reaction parameters of catalytic oxidation should be 20 ℃, pH adjusted to 5.0 and [Fe^2 ] 300 mg/L. Then with 5% H2O2 added and after one-hour reaction, the COD removal rate could achieve about 52%. Finally, coagulation was adopted to remove a portion of refractory organics, and 15% polymeric molysite flocculant was the best for the coagulation, and the COD removal rate could reach about 15%. Therefore, the proposed feasible process of physicalchemical pretreatment for ATC waste liquid could have about 70% COD removed in total. 相似文献
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为探索EM菌在淡水水质净化处理中的作用,以不同的EM菌液浓度（VEM/V污水为0‰、0.1‰、0.5‰、1‰、5‰）在有氧通风、常温条件下处理天心湖水样,通过测定湖水样处理前后的pH、SS、色度、COD和氨氨水平变化,评价EM菌对淡水水质的处理效果,研究结果表明：浓度为0.1‰的EM菌液处理对天心湖水的COD去除效果最佳;浓度为1‰的EM菌液对天心湖水的氨氮去除效果最佳;浓度为5‰的EM菌液处理使湖水COD、氨氮水平升高,水质反而受到污染.通过选择EM浓度、处理时间、处理温度三个影响因素,按L9（34）正交表进行正交实验,结果表明EM处理天心湖水的最佳工艺条件是：处理时间7d、处理温度30℃、EM浓度0.2‰,对COD的去除率达到36.52％;按上述正交实验最佳工艺条件进行验证实验,结果表明,对天心湖水中COD的去除率可达到35.47％,对生活污水处理COD去除率可达41.18％.本实验可为进一步研究EM在水质处理上的应用提供参考. 相似文献
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任百祥 《河北职业技术学院学报》2014,(2):55-58
采用纳米TiO2为催化剂,超声辐照为主要手段对实际印染工业废水进行了降解实验研究,考察了各种反应参数对印染废水降解效果的影响。结果表明,纳米TiO2对印染工业废水的超声降解效果具有明显的辅助和提高。当超声波频率为45kHz,功率为200W,溶液初始pH值为2.63,超声反应时间为150min的条件下,印染工业废水的COD去除率为73%,而同样条件下,投加750mg/L纳米TiO2,其超声降解废水COD去除率可达90.2%。 相似文献
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利用自制聚合硫酸铁处理高色度印染废水，研究了最佳实验条件。该方法工艺简单，药剂成本低，废水的COD去除率达70％以上，脱色率达98％以上，出水水质达到了国家印染废水排放二级标准。 相似文献
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为便于批量工业废水的快速测定,探讨了不同回流时间对COD测定值的影响,得出结论如下:当水样的COD值在500～800mg/L时,回流时间需要大于90min;当COD值在300～500mg/L时,回流时间需大于60min;当COD值小于300mg/L时,回流时间仅需大于30min。 相似文献
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广州市城市污水属于典型的南方城市污水,污染物浓度不高.2000～2004五年间的监测结果表明：BOD5在30～200mg/L之间,COD在70～300mg/L之间,氨氮在10～40mg/L之间,总氮在10～40mg/L之间,总磷在1.5～5mg/L之间;可生化性较好,可生化性指数在0.35～0.75之间;生物脱氮除磷的潜力较大,其碳氮比和碳磷比的变化范围分别是：2～5以及20～60之间. 相似文献