50results about How to "Guaranteed Filtration Speed" patented technology

The invention relates to a method for preparing marsh gas through straw, excrement and kitchen waste, and belongs to the technical field of renewable energy. The method comprises the following steps of: a, preprocessing, namely, feeding crushed straw, kitchen waste and excrement into a preprocessing tank; mixing; then transferring into a premixing tank to heat at a constant temperature; and uniformly mixing to obtain a mixture; and b, anaerobic fermentation, namely, feeding the mixture into at least one anaerobic fermentation tank to heat at the constant temperature; and agitating and fermenting to obtain the marsh gas and fermentation residues. The method has the beneficial effects that the operation is stable; the production efficiency of marsh gas is high; the production cost can be reduced; and mass popularization can be performed.

The invention provides a sewage filtering system which comprises a filtering pipe. A front filter net and a rear filter net are arranged inside the filtering pipe in a tensioned manner, each of the front filter net and the rear filter net is made of soft iron wires which all can move transversely, a front annular plate and a rear annular plate which extend inward in the radial direction of the inner wall of the filtering pipe are arranged in the filtering pipe and stick close to the front filter net and the rear filter net respectively, a bar-shaped electromagnet is arranged on a central connecting line of the front filter net and the rear filter net, the front filter net and the rear filter net are symmetric according to the middle section of the electromagnet, a front piezometer and a rear piezometer are arranged on the front sides of the front filter net and the rear filter net respectively, and the front piezometer, the rear piezometer and the electromagnet are jointly coupled to a controller outside the filtering pipe. The sewage filtering system can actively adjust mesh size of the filter nets according to the size of impurity particles in the process of primary filtering of particle impurities in sewage, thereby taking both filtering speed and filtering effect into consideration.

The invention provides a new type of sulfate adsorption material for water body, with controllable pore size, which can not only ensure the filtration speed of water, but also have a very good adsorption effect on sulfate ions. There is no energy consumption in the treatment process, and only gravity filtration is needed. Yes, simple and environmentally friendly; after the adsorption material is used for a period of time, if the filtration speed cannot meet the requirements, it can be replaced; the replaced adsorption material can be used as a plant culture substrate, and sulfate ions can be absorbed by plants as a fertilizer.

The invention relates to food additive silica gel and a production process of the food additive silica gel, belonging to the technical fields of food additive silica gel and the production process of the food additive silica gel. The food additive silica gel is silica gel with a three-dimensional spatial reticular structure and an X-ray amorphous material, with the soluble iron ion content being less than 2ppm, the granularity median value being controlled to 14-16mum, granules less than 10mum being controlled to below 15%, the specific surface area being greater than 450 m<2> / g, the pore volume being greater than 1.2ml / g, and the average pore diameter being equal to or greater than 10nm. The production process of the food additive silica gel comprises the steps of: (1) raw material preparation; (2) reaction to prepare gel; (3) aging to remove iron and enhance activity; (4) washing; (5) instantaneous drying; and (6) grinding and size grading. The food additive silica gel provided by the invented is reasonable in granularity median value control and large in specific surface area and pore volume, has the soluble iron content being less than 2ppm, and can effectively adsorb proteins easy to haze, effectively improve the quality and the shelf life of beer as the effective grain size distribution in the silica gel is concentrated and the content of the granules less than 10mum is low, and ensure the filtration velocity of the beer so as not to affect the production capacity of the beer.