城镇污水资源化技术发展状况

污水资源化是解决当前水资源短缺，减少环境污染的有效途径，经过几十年的发展，城镇污水资源化技术取得了很大进展，讨论了城镇污水资源化的意义、技术和发展前景。     

碱性条件下化学法处理大同齿轮厂混合电镀废水

针对大同齿轮厂电镀车间外排废水中既含CN- 离子 ,又含Cr6+及Ni2 +、Zn2 +、Cu2 +等重金属离子的现状 ,在碱性条件下 ,采用先氧化破氰 ,再还原六价铬至三价铬 ,最后混凝沉淀的处理工艺 ,使处理后出水达标排放     

1000t/d含油废水旋流分离技术及设备研究

将实验室研制的 HL 型旋流器用压力容器式方式并联起来 ,建立 10 0 0 t/ d规模的示范装置 ,并进行试验。示范装置的试验结果表明 ,与工业测试比较 ,HL型旋流器并没有因为规模的放大而造成性能下降 ,它能取代石化行业目前采用的“一隔二浮”流程中的大部分装置 ,具有明显的经济效益和广阔的应用前景     

感光胶片废水的水解酸化—好氧处理工艺试验

对感光胶片有机生产废水处理工艺进行了方法采用水解酸化－好氧串联工艺和传统活性污泥法两种方法并进行对照。结果经水解酸化处理，废水的ＢＯＤ５／ＣＯＤｃｒ可提高至０．５４－０．５６，平均增加了１７％左右，证实了水解酸化菌在该工艺条件下具有搞高效片废水可生化性的功能。     

Prenatal diagnosis of mosaic 4p – in a fetus with trisomy 21

Mosaicism for the Wolf-Hirschhorn syndrome, del(4)(p16), is extremely rare and has not been reported in association with a numerical chromosome abnormality. We report the prenatal diagnosis of mosaic del(4)(p16) and non-mosaic trisomy 21 in a 16-week female fetus. The pregnancy ended in spontaneous abortion at 34 weeks secondary to fetal demise. The fetus had features of both 4p – and trisomy 21.     

Detecting neural tube defects by amniocentesis between 11 and 15 weeks' gestation

Forty-two open neural tube defects (NTDs) were identified in our series of 7440 amniocenteses tested between 11 and 15 weeks of gestation. Using a cut-off of ≥2.0 MOM, the detection rate for open NTDs was 95 per cent; 100 per cent each for anencephaly and spina bifida; and 78 per cent for encephalocele. Two encephaloceles had AFP levels less than 2.0 MOM and negative AChEs. Thirty-four (81 per cent) of these NTDs were tested between 13 and 15 weeks and 8 (19 per cent) before 13 weeks. There were 0.6 per cent false positives by AFP (excluding serious abnormalities and fetal death) and 0.1 per cent after AChE. The likelihood of an open NTD after an elevated AFP (≥2.0 MOM) was 24 and 77 per cent for any serious abnormality. These results, when combined with an earlier study, indicate that amniotic fluid AFP appears to be as sensitive a test for open NTDs between 13 and 15 weeks as between 16 and 20 weeks. Additional experience is necessary to determine this before 13 weeks.     

水解酸化─厌氧─好氧─混凝─吸附工艺处理洁霉素生产丁提高浓度有机废水

采用水解酸化厌氧好氧混凝吸附工艺处理洁霉素生产丁提高浓度有机废水，工程实践表明，ＣＯＤＣｒ和ＢＯＤ５去除率在９９％以上，所排废水各项指标达到国家排放标准。     

The curve of ion exchange ratio(%)-pH of the interaction between suspended particles with Cd(II) in the Yellow River

The curve of ion exchange ratio(%)-pH of the interactionbetween suspended particles with Cd(II) in the Yellow River wasstudied. The effects of lysine on this curve have been alsoinvestigated. The results showed that (1) Cadmium in Cd(OH)+ formin the suspended particles exchanges with the cations.The exchangeratio of Cd2+ is nearly at its greatest value in the range of pH(8.0-8.5) in natural aquatic system; (2) Ion exchange ratiodecreases as the concentration of Cd2+ raises from 8.9×10-6 mol/L to 2x8.9 x 10-6mol/L; (3) At the lysine concentration of 6.8x10-6 mol/L, it can promote the ion exchange ratio; (4) Adsorption of thesuspended particles to cadmium is weaker in seawater and Jin ShaRiver than in the Yellow River.     

轴承生产废水处理工艺的选择与实践

采用絮凝气浮 过滤工艺处理轴承生产废水。工程实践表明,该工艺处理效果稳定、耐冲击负荷、工艺组合合理。预处理后的废水经气浮 过滤工艺处理后,COD、SS、油的去除率分别为80.62%～84.31%、81.00%～84.39%、89.37%～96.45%,出水完全能达到排放标准。     

印染废水处理工艺的改造实践

由于原有的废水处理系统的处理效果不能达到应有的处理目标。废水的色度、COD_(cr)、BOD_5、硫化物仍然经常出现超标现象。所以必须对原有的废水处理系统进行改进。通过实验室小试,确定新的絮凝剂和最佳操作条件,同时对接触氧化池的填料更换,提高废水中污染物的去除效率,使出水水质达到行业排放一级标准。该工艺具有运行费用低、处理效果稳定等特点,尤其适合中小型印染厂废水治理。