污水处理

With respect to the optimization design of sewer network,tree structured theory was used to depict the sewer network,ternary tree form was proposed to treat the sewer network structure,and pipe section was regarded as node in this study.

对于污水管网的优化设计，采用了图论中树形结构的理论来描述污水管网，提出用三叉树的形式来处理污水管网的网络结构，把管段当作树的节点作为研究对象；利用树的遍历中的后序法进行水力计算，在优化计算时采取了枚举标准管径法来选取管径，可以提高运算速度；在优化程序中寻求造价最低、最优的同时考虑了管道费用和泵站费用。

The results showed that the wastewaters from the production of dyestuff, rubber and assistants from individual discharging points had significant effects on nitrification,while some characteristic pollutants,sueh as aminobenzene,nitrobenzene,phenol as weU as Zn2+,Mn2+,and Ni2+,especially Ni2+,had obvious inhibiting effects on nitrification,resulting in obvious reduction of the rate of nitrificatiOn in the biochemical treatment system.

研究结果表明：来源于个别排放点的染料生产污水、橡胶生产污水、助剂生产污水对硝化作用有显著的影响，一些特征污染物如苯胺，硝基苯，苯酚及Zn2+，Mn2+，Ni2+均对硝化作用有明显的抑制作用，从而导致生化处理系统的硝化反应速率明显降低，而且以Ni2+最为显著。

Under lab condition.［Result］ TN and TP concn. in the sewage were decreased constantly with the increase of duckweed treating time in 0-10 d. The purification ability of Spirodela Schleid on TN and TP was higher than that of Lemna L. The maximal removal rates of duckweed on TN and TP in sewage diluted at 5 times were 71.14% and 81.00% resp. and that in the sewage diluted 10 times were 92.18% and 91.33% resp.

结果］ 污水TN和TP浓度随浮萍处理时间（0～10 d）增加而持续降低；紫萍属浮萍对TN和TP的净化能力优于浮萍属浮萍；浮萍对稀释5倍的供试污水TN和TP的最大去除率分别为71.14%和81.00%；浮萍对稀释10倍的供试污水TN和TP的最大去除率分别为92.18%和91.33%。

Among the economic crops, pachyrhizus leaf had the most remarkable treating effect, the COD treating capacity per day per unit area was 4.01g, that is, a 50% treating rate; the BOD treating capacity was 1.15 g, that is, a 35% treating rate; the TP treating capacity was 0.23 g, that is, a 16% treating rate; the TN treating capacity was 1.87 g, that is, a 74% treating rate; however, the treating effect decreased as the total amount of pollution entering this system increased by raising the water volume, which was mainly owing to the relatively short hydraulic retention time.

由水质试验结果显示，本系统所选用的作物处理生活污水成效极佳，优於一般湿地选用的植物，以及河滩地原生草种型态，其中以地瓜叶的处理成效最为显著，每日单位面积COD去除速率为4.01 g 、处理效率达50﹪；BOD去除速率为1.15 g 、处理效率达35﹪；TP去除速率为0.23 g 、处理效率达16﹪；TN去除速率为1.87 g 、处理效率74﹪，而以加大水量的方式，增加进入本系统之污染总量，其处理成效减低，主要原因受到水力停留时间较短影响，未来可以增加处理面积、水力停留时间加长、提高原水浓度为后续之研究方向，以达到增加本系统处理成效之目的。

It is the common phenomenon that the industry wastewater is treated to be reused water, new industry water, desalted water, soft water or pure water for industrial production.

节能低碳低碳是钢铁企业水系统所追求的目标，将工业污水收集后处理制成回用水、工业新水、脱盐水、软化水或纯水等用于生产，是目前钢铁企业回用工业污水、实现污水资源化的常见方式。

It is the common phenomenon that the industry wastewater is treated to be reused water, new industry water, desalted water, soft water or pure water for industrial production.

节能减排是钢铁企业水系统所追求的目标，将工业污水收集后处理制成回用水、工业新水、脱盐水、软化水或纯水等用于生产，是目前钢铁企业回用工业污水、实现污水资源化的常见方式。

This text through to various treatment include chromium, last cyanogens and alkali waste water craft comparison of the method sour, treatment craft of choosing economy to be effective separately; Adopt alkaline chlorine France punish, include cyanogens waste water, chemistry reduce, take place, deal with, include chromium waste water, in handle course among to waste water sour alkaline go on regulate, design one small-scale sewage treatment plant, demand to reach second in world and handle the standard.

本文通过对各种处理含铬、含氰及酸碱废水工艺方法的比较，分别选择经济有效的处理工艺；采用碱性氯化法处理含氰废水，化学还原发处理含铬废水，在处理过程中对废水的酸碱性进行调节，并设计一座小型的污水处理厂，要求达到国际二级处理标准。

Method］ With 3 kinds of representative local duckweed varieties selected from the each sample place in Yangzhou City and Kunshan City resp. as the tested materials and the anaerobic wastewater diluted at 5 times and 10 times from the cattle Farm as the tested sewage,10 groups of purification treatments matching with 5 different duckweeds on 2 concn. of sewage were set up to investigate the effect of different duckweed variety on the purification effect of N and P in sewage with different concn.

方法］ 从扬州市和昆山市各采样点选取的当地3种有代表性的浮萍品种为供试材料，以经稀释5倍、10倍的牛场厌氧废水为供试污水，设置5种不同浮萍对2种不同浓度污水的10组净化处理，在实验室条件下考察了不同浮萍品种对不同浓度污水氮和磷的净化效果。

Starch effluent and citric acid factory effluent had been treated. The upper layer of starch effluent was treated by procedure of freezing-oxidation-flocculation-adsorption, the removal efficiency of COD is 81.6%, and the sludge is innocuous for the people and environment, which can be used as feed for domestic animals.

第三部分食品工业废水的处理分别对粉条加工行业淀粉废水及柠檬酸生产废水进行了处理，采用&冷冻→催化氧化→絮凝→吸附&工艺对上层稀液进行处理可使COD_由2003mg/L降至369mg/L，去除率达81.6％[国家污水综合排放标准(GB8978-1996)三级标准：COD_值小于500mg/L]，应用该法处理粉条加工行业淀粉废水的同时产生的絮体有望作为饲料，能够产生经济效益，实现综合利用。

The objective of this study was to compare and differentiate the different removal mechanisms of the dissolved organic matter in the secondary effluent during the granular activated carbon adsorption, horizontal subsurface flow wetland treatment, sand column treatment, laboratory-scale soil aquifer treatment and GAC+SAT.

通过模拟活性炭吸附、砂柱处理、土壤含水层处理、GAC+SAT及潜流式人工湿地处理实验，研究了城市污水处理厂二级出水中溶解性有机物在吸附、生物降解及生物与吸附的共同作用等具有不同DOC去除特点的处理过程中的去除及转化机制。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。