Discussion of the Application and Foreground of Falling Water Aeration with the Process of Sewage Treatment          下载免费PDF全文

DENG Rong - sen  WANG Zuo - liang  WANG Tao 《保鲜与加工》2007,(1):78

The engineering design of sewage treatment plant for the Chongqing city, P. R. China is analyzed in this paper. Considering the situation of China and other projects, the characteristics of falling water reactor for the environment protection project and economy of investment is introduced ; the application and foreground of falling water aeration in the process of sewage treatment is discussed, such as Oxidation - ditch, SBR, and so on. The conclusion indicated that the falling water aeration can be designed and used as an independent aeration, and, it is an upgraded technology of sewage treatment which is adaptive for city water environment control in middle and small towns in China. The falling water aeration may reduce running cost of the sewage treatment plant, is adaptive for foothill and the mountainous areas, and reduces project investment and environments damage.  相似文献   

Measurements to Protect Owners'' Benefits under the Non-price Bottom Bidding          下载免费PDF全文

DAI Jia - li  FU Hong - yuan 《保鲜与加工》2007,(1):110-113

Investment on construction projects has become an important factor in improving the development of economy in China.The non-price bottom bidding is a representation that the investment on projects is becoming standardized.During the years of trying out the non-price bottom bidding,the colluding in bidding or bidding below the cost has happened several times,which have damaged the benefits of owners.To solve theses problems,this paper firstly studies the reason of these problems-the failure in the normal relationship between principal and agent.Then,some measures have been presented as follows: building systematic and scientific system of qualification prejudication,judging behaviors of colluding in bidding and bidding below the cost with reason and providing a surety mechanism of the project.The authors hope that these measures are beneficial to non-price bottom bidding.  相似文献   

Effects of Low- Intensity Ultrasound Treatment on Excess Sludge     

DING Wen - Chuan  LONG Teng - Rui  XU Long  LI Li  LIAN He - chuan 《保鲜与加工》2006,(3):74-77

In this study the influence of the low-intensity ultrasound treatment on excess sludge has been observed.The oxygen uptake rate(OUR),soluble chemical oxygen demand(SCOD),soluble total nitrogen(TN) and soluble total phosphorus(TP) were examined for three power levels of 0.03 W/mL, 0.05 W/mL and 0.1 W/mL as well as two time series of 0~5 min and 0~30 min.It showed that there were two stages of ultrasonic treatment: the first stage took place within the flocs in four minutes,in which SCOD,TN,TP were dissolved from flocs.In the second stage,the microbial activities have been strengthened,as well as OUR,TN,TP have increased greatly.  相似文献   

Strength and Microstructure of Sulphoaluminate Cement Containing Ultra- Fine CaCO3     

ZHOU Shi - hu  HUANG Jia - mu 《保鲜与加工》2006,(4):121-124

The existence of ettringite in sulphoaluminate cement hardened paste is mainly in the form of pole-like crystal,which causes unfavorable effect on the cement.In this paper the strength and microstructure of the sulphoaluminate cement containing ultra-fine CaCO_3 weze discussed.Experimet results show that the strength of sulphoaluminate cement was obviously improved by adding 3% of ultra-fine CaCO_3.After curing for 28d,the compressive strength of cement paste and mortar is 100.6MPa and 94.1MPa respectively,and the bending strength of the mortar reached 12.5MPa.SEM study on hardened paste of sulphoaluminate cement containing ultra-fine CaCO_3 showed that its structure was dense and homogeneous,there was hardly any massive crystall detected.  相似文献   

A Comparative Study of Confined Concrete Models under Cyclic Loading     

ZHOU Weng - feng  HUANG Zontg - ming  BAI Shao - liang 《保鲜与加工》2006,(3):59-62

In this paper,four models are selected as the representatives and applied to nonlinear dynamic analysis program for space frames which is based on the beam-column elements using the finite element flexibility method and the fiber model.Park's test on combined axial and bending columns under cyclic loading are taken as the calibrations,comparisons to material and structural member level are drawn and the analytical results of various models are discussed.  相似文献   

Design of Reef- blasting Project and Analysis of Regulation Effect for Fuling to Tongluo Canyon Reach in Three Gorges Reservoir Region     

LUO Hong  ZHU - Jun - feng 《保鲜与加工》2006,(5):47-50

After the completion of the Three Gorges project,the navigation conditions of the reservoir region will be improved evidently,which has laid the foundation for straight run of the 10,000-ton-class fleet to Chongqing Port,and is the promotion of the development of shipping in Yangtze River.But according to the standard of the 10,000-ton-class fleet,there are still some reaches of the reservoir region can not meet the requirements of the waterway on smooth and safe navigation.Therefore,some regulation measures should be adopted to eliminate these obstructions.It is one of the important parts in the reservoir region waterway regulation work for the Fuling to Tongluo canyon reach blasting project.30 reef obstacle blocks of 14 reaches in this project were removed by blasting.Based on the analysis of obstruct features of various rocks,according to the standard of the 10,000-ton-class fleet,the design parameters and blasting regulation program were put forward,and the regulation effect is analyzed and forecasted.  相似文献   

Study on Inheritance and Development of Traditional Street, Lane and Courtyard in City Growth     

SU Hong - zhi  CHEN Yong - chang 《保鲜与加工》2006,(5):70

City is not a concretionary but a dynamic matter. It should keep close touch with the animated tradition, and we should look forward to its future too. Thus we will be facing with the problem of inheritance and development of the tradition. Because the tradition is a potential for good as wdll as for evil, it can promote the development of a thing, and also may hinder its progress, so there should be correct attitudes to the traditional inheritance. This paper studies the modem application of the traditional street, lane and courtyard, which brings new vitality to the tradition and imparts fresh life to the modem city.  相似文献   

The Reformation of the Construction Employment System and Building a Harmonious Society     

LIAO Yu - ping  YAO Bing  LIU Yi - sheng 《保鲜与加工》2006,(2):120-123

Construction industry is not only the pillar industry in national economy,but also the typical industry with intensive labors.As a major part of the construction industry,the Construction Employment System(CES) is an important factor of the market order,as well as the quality,the safety and the development of the industry.It is also an important part for building a harmonious society.It concerns the social harmony,political harmony,societal harmony,cultural harmony,urban-rural harmony,etc.However,at present,there are still many problems in CES that might influence the harmonious society building.This paper advises to speed up the reformation of CES,to establish and consummate the system of construction labor subcontract,to develop vigorously labor subcontract corporations,to improve the quality of the labors,to ensure the rights and interests of the labor.  相似文献   

Inspiration to Reuse of Old Industry Building with SOHO     

WANG Xue - song  WEN Jiang  SUN Yan 《保鲜与加工》2006,(3):4-6

This paper analyzes the SOHO and the reuse of old industry building, and deeply explores the creation and application of SOHO mode in the reuse of old industry building, furthermore, it points out the four inspirations to the reuse of old industry building, at the end, a general judgment of the development logic of SOHO is given.  相似文献   

Structural Analysis and Discussion of Wide -stayed Bridge Basket     

LI Sheng - hai  SU Yong - hui  DING Zhong - cheng 《保鲜与加工》2006,(5):7-12

Based on a cable -stayed bridge girder as an example, the structure and function, the operating principle and calculation model of the main elements of the Basket of wide - stayed bridge were described in detail. A further discussion was carried out on the Basket of Cantilever construction of the main beam in the structure.  相似文献