42results about How to "Increase permeate flux" patented technology

The invention discloses a method for treating reverse osmosis concentrate. The method comprises the step of sequentially carrying out crystallization and membrane distillation on the reverse osmosis concentrate. The method is carried out at a normal pressure and a low temperature, and has the characteristics of simplicity in operation and convenience in management. The concentration of scaling ions in the reverse osmosis concentrate is reduced through induced crystallization softening, the membrane distillation concentration process can be carried out under the condition of lower membrane pollution, high-quality industrial pure water is obtained when the reverse osmosis concentrate is greatly reduced, and can be recycled in industrial production, thus the problem of treating the reverse osmosis concentrate is successfully solved, and a wide application prospect is achieved.

The directly contacting membrane desalting apparatus with hollow fiber includes membrane tank, porous non-polar hollow fiber membrane arranged inside the membrane tank, porous plates and arc core cover plates. Two porous plates are set separately on two sides of the membrane tank; two arc core cover plates are set separately on the outer sides of the porous plates; the membrane tank, the porous plates and the core cover plates are arranged in parallel; and sealing rubber rings are set between the membrane tank and the porous plates and between the porous plates and the core cover plates. The desalting apparatus of the present invention has high water producing capacity, low water producing cost, high sea water recovering rate, simple operation and wide application range.

The invention discloses a process for strengthening nitrification treatment based on coupled type stripping and belongs to the technical field of sewage treatment. During the nitrification treatment process of sewage, under the condition of maintaining a certain content of dissolved oxygen in the system, the elastic filler is subjected to extrusion treatment with different degrees of deformation. The extrusion treatment includes the coupling of deep extrusion and shallow extrusion. , the deep extrusion is carried out when the system load drops, the outlet water quality is close to the target value or the system resistance exceeds the design inlet water distribution pressure, and the shallow extrusion is carried out when the system load is stable. The present invention combines deep extrusion and shallow extrusion, on the one hand, it can realize the release and redistribution of the biofilm filler, improve the mass transfer efficiency, and on the other hand, it can promote a more uniform distribution of dissolved oxygen inside and outside the biofilm filler. The synergistic effect of the two can strengthen the nitrification reaction, improve the efficiency of sewage treatment, and restore the quality of effluent water.

The invention provides a quaternary phosphonium salt antibacterial ultrafiltration membrane. The membrane sequentially comprises a porous mechanical support membrane, an ultrafiltration separation functional layer and a polymer layer from bottom to top. The preparation method of the ultrafiltration membrane comprises the following steps: S1, forming the porous support membrane; S2, preparing the polymer layer; and S3, carrying out drying and post-processing. Quaternary phosphonium salt is one of the latest research results in the field of antibacterial agent research, and experiments prove that the antibacterial effect of the quaternary phosphonium salt is nearly two orders of magnitude greater than the antibacterial effect of quaternary ammonium salt, so the antibacterial performance of the ultrafiltration membrane can be greatly improved; secondly, a separation contact layer of the ultrafiltration membrane is formed by coating a traditional hydrophobic material with a hydrophilic quaternary phosphonium salt antibacterial polymer, so hydrophilicity is improved, and the ultrafiltration membrane is thus good in anti-pollution performance and relatively high in water production flux; and in addition, positive charge P<+> ions of the quaternary phosphonium salt polymer layer can endow the ultrafiltration membrane with interception performance on ions, especially on positively charged ion substances.

The invention discloses a membrane biological reaction system, aiming at providing a membrane biological reaction system which is compact in structure, small in occupied space, capable of reducing the sludge concentration of a submersible membrane processing unit, and prolonging the service time of a membrane assembly. A sludge and water separation device is arranged between an aerobic pool of the biological processing unit and the immersed membrane processing unit and consists of a pool body, a first guide wall, a second guide wall, a third guide wall and an aerating device, the aerating device is arranged at one side of the bottom of the pool body, the first guide wall is outward obliquely arranged in a manner of forming an angle of 110-120 degrees with the horizontal direction, the lower end of the third guide wall corresponds to the lower end of the first guide wall at a projection point at the bottom of the pool body, the third guide wall and the bottom of the pool body are outward inclined by an angle of 60-75 degrees, and the second guide wall is perpendicular to the bottom of the pool body and positioned between the first guide wall and the third guide wall. The system does not require entire separation of mixed liquid, and is short in residence time, compact in structure and small in occupied space.