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The input of nutrient of vegetations in riparian zone in Xiangxi River was few viewed. Here we aimed to ascertain the sources and dynamics of the Xiangxi River's nutrient. Litter was collected by box(100 × 100 × 20 cm3) and the decomposition rate was measured. The content of nitrogen (TN), phosphorus (TP), and total organic carbon (TOC) in riparian zone soil were also analysed. The main results showed...
The technology of freeze latent heat source heat-pump is very important for utilization of energy contained in surface water. On the condition of double convection beside phase interface, using method of similarity theory and dimensional analysis, some important conclusions of plane ice layer were gained, such as time-variation rules of thickness and growth speed, necessary and sufficient condition...
The heat energy loss of methane liquid is the most important reason for low temperature of methane biochemical reaction in cold area by energy-flow analysis. The heat energy recovery of methane liquid can build a self-energizing system. Vegetable greenhouses and birdhouse or livestock barn in cold area need heating in winter, in order to supply the most heat energy, invented the methane-eletricity-heatpump...
Energy delivering pipes which are buried in the ground will change the surrounding temperature field accompanied by energy loss. This paper established the two-dimensional temperature field mathematical model of the soil around the underground burying pipes, and simplified the third order boundary condition as the first kind of boundary condition by adopting the hypothesized surface law. Besides,...
The thimble delivery heat-transfer (TDHT) system is one of the primary modes to utilize the energy of urban sewage. Given out the Schematic diagram of TDHT system, introduced the definition of equivalent fouling roughness height, used the Niklaus semi-rational resistance coefficient formula in rough region, the calculation methods of the sewage flow resistance are explained. Through the resistance...
The urban sewage source heat-pump technology in China is still in the starting and groping stage, so the generalization and communion must be timely. This thesis introduces the experience and experiment or test production on design, construction, and operation of four large sewage source heat-pump projects in Harbin and Beijing. It has represented in detail about device election, loop design, flow...
Model of pumps in pass-by series was established for sewage subsystem, and through the numerical simulation, the stability and adjustability of the subsystem were discussed. The principle of loop-independence of low resistance pass-by series pipe with tow-stage pumps was discovered. The technical feasibility of tow-stage sewage heat-pump was also confirmed. This thesis has also given out the main...
The hydraulic and continuous filter regeneration equipment is the critical element. Its technical principle and characteristics were introduced. The state of filtering process was quantity described by filter plugging coefficient. Dynamic model directed toward filtering surface and homeostasis model directed toward position were respectively established. By using the models and experimental data,...
The resource and environment evaluation and programming were the necessary condition for healthy development of urban sewage heat energy re-utilization. This paper introduced the reconnaissance technology, resource evaluation, environment evaluation and programming methods for sewage heat energy reuse.
The thimble delivery heat-transfer (TDHT) system is one of the primary modes to utilize the energy of urban sewage. Used the efficiency-number of transfer units method (ε-NTU), the heat-transfer efficiencies of the parallel-flow and reverse-flow TDTH forms are analyzed and the calculation formulas and characteristic are also given. The results indicated that the efficiency of parallel-flow...
Sludge is difficult to be dewatered without any pretreatment. The experiment of dewatering sludge by ultrasound, thermal hydrolysis and electrical pretreatment were studied. Ultrasound pretreatment proves it can adjust the structure of sludge, which will be restructure and change the water form increasing the water content which could be dispel easily. Thermal hydrolysis pretreatment disassembles...
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