摘要
医药废水中的Cl-浓度普遍很高,研究高浓度氯离子对生化池好氧细菌的影响对于医药行业废水的处理具有重要意义。采用国标汞盐法测量CODCr,采用国标硝酸银法测量Cl-的质量浓度,研究随原医药废水中Cl-质量浓度的增加废水中COD、DO、SV30%以及菌种数量的变化规律。结果表明：在加NaCl的试验中,COD值总体变化趋势为先增加后降低,稳定一个阶段后不断增加,整个过程呈现4个阶段;DO质量浓度总体变化趋势呈现为稳定—减少—增加3个阶段。在Cl-质量浓度增加至3 175 mg/L之前的阶段,好氧细菌处于驯化期;随着Cl-质量浓度增加,好氧细菌处理污水的能力逐步下降;在驯化期、恢复期之后,Cl-质量浓度介于4 294~5 146 mg/L时,好氧细菌生长态势稳定,其中,当Cl-质量浓度为4 898 mg/L,废水COD值为456mg/L时,DO质量浓度降至最低（6.4mg/L）,SV30%为25mg/L,说明好氧细菌活性最好,此时处理能力最佳;Cl-质量浓度介于5 146~7 911 mg/L阶段,好氧细菌数量逐渐减少,污泥逐渐呈现漂泥状态,上清液逐渐浑浊,溶解氧数值逐渐升高,表明微生物逐渐进入生物衰亡期。医药行业高氯废水的进水临界Cl-质量浓度为4 898.45 mg/L。
In this paper,we would like to introduce the findings of our experimental study of the effect of aerobic bacteria activities on the high-concentrated chloride ion in pharmaceutical sewage.As is known,there always exists high concentrated chloride ion in the pharmaceutical sewage,which may strongly affect the biochemical pool of aerobic bacteria.Coming from this need,we have arranged a series of experiments with the original pharmaceutical sewage with content of chloride ion in it.For our research purpose,we have made corresponding experiments by using the standard mercury salt method for measuring COD and the national standard silver nitrate method for measuring Cl-concentration,so as to observe better the changing regularities of chloride ion in correspondence with the COD,DO,SV30% and spawn quantity.The experimental data indicate that in the process of NaCl experiment,the COD value tends first to increase and then decrease.When the experiment comes to the stable stage,it can be found that the COD value tends to increase ceaselessly,and finally turns the process into four stages： DO value tends to be stable,then dropping,and then rising.And,in the last stage,when the chlorine ion concentration increased to 3 175 mg/L,the anaerobic bacteria would be brought up into a domestication stage.With the increase of chlorine ion concentration,the aerobic bacteria for sewage processing tends to gradually decline.Entering the stage of domestication and restoration,the concentration of chlorine ion tends to increase in a range from 4 294 mg/L to 5 146 mg/L,that is to say,the aerobic bacteria may grow to a stable stage,in which,when the concentration of chloride ion is 489 mg/L and the COD of sewage is 456 mg/L,the dissolved oxygen would begin to decrease to the lowest（DO value is 6.4 mg/L）,SV30% is 25 mg/L.Thus,the result shows that the activity of aerobic bacteria is best with the treating capacity turning to be best at the moment.And,when the concentration of chlorine ion grows between 5 146-7 911 mg/L,the density of aerobic bacteria would begin to decrease gradually,whereas the sludge may come to the loose drift mud state gradually.And,now,the supernatant becomes gradually turbid with the increase of gradually dissolved oxygen.Thus,it would bring the microbial gradually into the biological decay.In the end,it can be concluded from the experiments that the highest water concentration of chloride ion in pharmaceutical sewage is 4 898 mg/L,which can provide useful parameters for the high chlorine sewage from the pharmaceutical industry,thus making high chlorine sewage treatment a useful operation reference for the pharmaceutical industry.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2013年第4期14-18,共5页
Journal of Safety and Environment
基金
国家水体污染控制与治理科技重大专项课题(2012ZX07505-005)
辽宁省教育厅科研项目(L2012121)
关键词
环境工程学
医药废水
高浓度氯离子
好氧细菌
进水临界浓度
environmental engineering
pharmaceutical waste water
high concentration of chloride ion
aerobic bacteria
critical concentration of influent water
