The paper describes the actual practice of using DN 1 900×18 m as the welding steel pipe in conduit piping project for Youjiang River Bottom in Tiandong, and it also introduces the construction technique on completed pipe towing down the river bottom after the assembling of sectional pipes on land.

Study on the Heavy Metal Pollution in Sediment of Fen River;

Seeded with normal anaerobic granular sludge,mixed sludge(normal anaerobic granular sludge and aerobic activate sludge),river sediments respectively, feeding with synthetic wastewater containing ammonia and nitrite, three similar lab-scale UASB systems were started up.

s: Using river sediments as seed sludge, at the condition of pH 5.

Effects of some major factors of anaerobic fermentative biohydrogen production with organic substrates was evaluated using preheated river sediments as seed sludge The results showed that: at 35 ℃ and initial pH of 65, these sediments could use different sugars including xylose,glucose,fructose ,sucrose,cellobiose,starch as substrates to produce hydrogen.

A gas chromatographicmass spectrometric method (GCMS) for the simultaneous determination of environmental estrogens (including 4nonylphenol, bisphenol A, diethylstilbestrol and 17αethinylestradiol) and endogenous estrogens (including 17αestradiol, 17βestradiol, estriol and estrone) in urine and bed mud is reported.

The theoretical study on phenomena ripping up the bottom" is presented in this paper, including the incipient velocity, ascending movement, the exposed condition from the water surface, descending and longitudinal movement of deposit pieces.