Abstract: The present invention relates to a dissipative particle dynamics (DPD) method for simulating an interfacial polymerization process of a hydrogel membrane. The method includes the following steps: 1) selecting various components with chemical structures thereof in a hydrogel phase and an organic phase of an interfacial polymerization system; 2) constructing a DPD model of solvent, hydrogel membrane material and water-soluble monomer in the hydrogel phase and a DPD model of organic solvent and oil-soluble monomer in the organic phase; 3) establishing a DPD model of the interfacial polymerization system composed of the hydrogel phase and the organic phase; 4) calculating an interaction parameter between DPD beads, that is, a conservative force parameter; 5) performing a DPD simulation by using Materials Studio software; and 6) evaluating an influencing factor determining the performance of the separation layer during the interfacial polymerization process according to the calculation file.

Abstract: The present invention belongs to the field of environmental materials, and discloses a simulation method for analyzing a diffusion property of a water-soluble monomer in a hydrogel membrane. The method specifically includes the following steps: 1) selecting a hydrogel membrane material and a water-soluble monomer to be simulated; 2) constructing an initial model; 3) optimizing a molecular dynamics model of the hydrogel membrane system; 4) performing a molecular dynamics simulation of the optimized model; 5) drawing a mean square displacement-time (MSD-t) curve; and 6) calculating a diffusion coefficient of a water-soluble monomer molecule in the hydrogel membrane system. The present invention analyzes the diffusion performance of the water-soluble monomer molecule in the hydrogel membrane system on a molecular level.

Abstract: A siphon type composite vertical subsurface flow constructed wetland has an uplink pool with a depth ¾ that of a downlink pool. Siphon-type drain tubes are equidistantly distributed at a first outer side of the uplink pool, and a total flow of the drain tubes is slightly greater than a largest total influent flow. Three layers of substrates are paved on each pool. A substrate on a first layer is a biological ceramsite having a relatively small grain size, another substrate on a second layer is zeolite having a relatively large grain size, and a further substrate on a third layer is cobblestone having a large grain size. The third layers of the pools are integrally communicated, and sewage in the downlink pool flows to the uplink pool through a communication port. Sludge on bottom layers of the pools is discharged from a siphon tube with water.

Abstract: A siphon type composite vertical subsurface flow constructed wetland has an uplink pool with a depth 3/4 that of a downlink pool. Siphon-type drain tubes are equidistantly distributed at a first outer side of the uplink pool, and a total flow of the drain tubes is slightly greater than a largest total influent flow. Three layers of substrates are paved on each pool. A substrate on a first layer is a biological ceramsite having a relatively small grain size, another substrate on a second layer is zeolite having a relatively large grain size, and a further substrate on a third layer is cobblestone having a large grain size. The third layers of the pools are integrally communicated, and sewage in the downlink pool flows to the uplink pool through a communication port. Sludge on bottom layers of the pools is discharged from a siphon tube with water.