A novel approach to treat combined domestic wastewater and excess sludge in MBR

Domestic wastewater was treated by combined anaerobic biofilm-aerobic membrane bioreactor(MBR) process, and part biomass in MBR was withdrawn, to treat with ozone, then the ozonated sludge was returned to anaerobic inlet. In aerobic MBR, MLSS and DO were controlled at 3000—3500 mg/L and 0.8 mg/L respectively. Comparing the experimental results of two stages, it was noticed that ozonation did not affect the removal efficiency for organics but had a significant influence on the removals of NHs-N and TN. During the ozonation period of two months, no excess sludge was wasted, and a zero sludge yield was obtained.     

顺层边坡岩体结构稳定性分析

顺层边坡的失稳问题一直是工程地质学和岩石力学领域内极为瞩目和急待解决的问题之一。本文根据顺层边坡的地质背景及力学作用机制,抽象出了顺层边坡溃屈破坏的力学模型。利用板柱弹性稳定性理论,结合结构力学的知识,推导出了相应的计算公式。实例分析表明,利用文中的理论方法,并结合工程现场有效的量测手段,可方便、有效的判定顺层边坡的稳定性。     

电阻焊电极材料热变形行为的研究

电阻焊电极在焊接过程中 ,承受着高温、高压和高电流的作用 ,工作条件十分恶劣。在导电、导热性能差不多时 ,其高温热稳定性的好坏直接影响它的使用寿命。因此 ,针对 3种典型的电极材料 (CuCr,CuCrZrMg ,弥散铜 ) ,进行了热变形行为研究 ,通过分析在不同高温情况下的应力 应变曲线 ,从而确定其高温热稳定性及使用寿命长短。     

Normal ranges of the activities of ten different enzymes in 100 independent preparations of chorionic villi. Comparison of specimens from induced abortions,biopsies, and cultured cells

In order to obtain a large set of normal control values, the activities of three cytosolic enzymes of purine metabolism and seven lysosomal enzymes were determined in homogenates of chorionic villi derived from induced abortions of normal pregnancies (7th–12th week) in about 100 individual cases. Possible reasons for the rather wide ranges of normal distributions of enzyme activities are discussed. The values are compared: (1) with available data in the literature; (2) with activities determined in decidual homogenates prepared from the same samples; (3) with activities of cells of cultures established and grown from villi in the same samples; and (4) with enzyme activities measured in chorionic biopsies using the same methods. Implications for the prenatal diagnosis of the associated metabolic diseases are considered.     

Effects of exogenous Ca2+ on the membrane permeability, MDA and SH group content of Alexandrium sp. LC3 under surfactant stress

The effect of Ca^2 on the removal of Alexandrium sp. LC3 under HDTMAB stress was investigated. The results showed that thetoxic effect of HDTMAB on Alexandrium sp. LC3 was significantly reduced in the presence of Ca^2 , especially under 4 mmol/L of Ca^2 .To understand the underlying mechanism, the SH group and MDA content of the cell membrane and membrane permeability weremeasured. It was found that the SH content of cell member increased, the MDA content and membrane permeability decreased whenAlexandrium sp. was treated with Ca^2 and HDTMAB complex, compared with using HDTMAB only. The data suggested that Ca^2 mightpromote HDTMAB stress resistance of Alexandrium sp. LC3 by reducing the permeability and increasing the stability of cell membrane.     

有机膨润土吸附水中萘胺、萘酚的性能及其应用

膜的反冲洗是膜生物反应器中常用的一种防止膜污染，提高透水率及透水率稳定性的技术。本通过数学推导与实验得到一个最佳反冲洗周期测定公式     

Effects of salinity on activities of H+-ATPase, H+-PPase and membrane lipid composition in plasma membrane and tonoplast vesicles isolated from soybean (Glycine max L.) seedlings

The effects of NaCI stress on the H^＋-ATPase, H^＋-PPase activity and lipid composition of plasma membrane(PM) and tonoplast(TP) vesicles isolated from roots and leaves of two soybean cultivars( Glycine max L. ) differing in salt tolerance(Wenfeng^7,salt-tolerant; Union, salt-sensitive) were investigated. When Wenfeng^7 was treated with 0.3% (W/V) NaCI for 3 d, the H^＋ -ATP aseactivities in PM and TP from roots and leaves exhibited a reduction and an enhancement, respectively. The H^＋ -PPase activity in TP from roots also increased. Similar effects were not observed in roots of Union. In addition, the increases of phospholipid content and ratios of phospholipid to galactolipid in PM and TP from roots and leaves of Wenfeng^7 may also change membrane permeability and hence affect salt tolerance.     

新沂河河道稳定塘工程研究

为解决新沂河上游污水出路及沿线城镇供水危机 ,按照“清污两制 ,控源导流”的思路 ,利用新沂河北偏泓 ,构建了与供水河流全程立交、与周边水系全程封闭的污水泓道专线 ,结合一定水工设施 ,形成了全长 15 9km的五级串联河道稳定塘工程。近 4a的运行实践表明 ,河道稳定塘对污水的调蓄、净化能力显著 ,净化效率渐趋稳定 ,完全实现了预期目标     

柱壳液力成形弹性稳定性分析

利用非线性弹性稳定性理论 ,分析研究了壳体液力成形工艺中的开口圆柱壳弹性稳定性问题。计算结果表明不仅非线性弹性临界载荷远低于线性弹性临界载荷 ,而且更重要的是内压很大程度上有助于提高柱壳轴向弹性临界屈曲载荷 ,这样为内高压成形工艺提供了弹性失稳理论依据     

电渗析治理糠醛废水过程性能的研究

糖醛废水含１．０％－２．５％的乙酸，直接外排，污染环境，浪费资源，通过３０－８０对膜，４００ｍｍ×８００ｍｍ隔板组装的电渗析器中型试验，脱除其中９５％以上的水，回收得到浓度为２０％的乙酸，再经萃取，精馏得到９９％工业乙酸，治理后的废水含酸量小于０．０２％，可安全排放或回用。对影响极限电流，过程效率的因素进行了探讨，导出工艺特性的经验式，提出相应特性常数。