The removal efficiency of COD,total nitrogen and total phosphorus for synthetic wastewater was 88%,89%,99%,respectively,while it was 85%,75%,99.

When synthetic wastewater was fed to a sequence batch reactor (SBR) using the mode of continuous water inflow and intermittent water outlet at low temperature (8～13 ℃) in the laboratory,sludge bulking caused by filamentous bacterium occurred .

In this study,experiments were performed by the operating manner of anaerobic/ aerobic/ anoxic/aerobic in a sequencing batch reactor (SBR)which was fed with synthetic wastewater.

Design of tapered leaf spring mill based on manual assembly and easy-maintenance;

The information and control characteristics of manual assembly were described,it was pointed out that the learning of skill knowledges is nearly a process in establishing and organizing various kinds of unit conditional reflexes.

Theory basis is provided for artificial blending rock, an approach is provided for exploiture Sichuan phosphate rock.

The physical and chemical properties, fertility properties and microbe activity of artificial mixed substrates and their effects on growth and development of sweet cherry were studied by potting and brick tank planting using vermiculite, slag, carbonized rice chaff, peat, rotten leaves soil, gravel, rotten straw, and common garden soil as basic ingredients.