89results about How to "Zero pollution discharge" patented technology

A gas dispenser is technically characterized in that a PLC firstly collects the pressure value of a pressure sensor in a gas dispersion gun, namely the pressure value in a vehicular gas cylinder. Then the pressure value is added with a preset value, wherein 0<the preset value <20. The summation is compared with the pressure value of each pressure sensor under a plurality of gas cylinder openings. The valve corresponding with the pressure value which is most approximative to and larger than the summation is opened for dispensing the gas through pressure difference. The steps are adopted again before balancing or after balancing. The steps are repeated until the value of the pressure sensor in the gas dispersion gun is the rated pressure value of the vehicular gas cylinder, wherein the rated pressure value is smaller than or equal to 20MPa. Then the valve is closed and the gas dispensation is finished. The gas station of the invention is composed of a plurality of gas cylinders and gas dispensers. The gas station is technically characterized in that the plurality of gas cylinders are used circularly for providing the high-pressure gas for satisfying the using amount of continuous gas dispensation of a single gun or a plurality of guns to the vehicular gas cylinder. The invention changes the technical route of prior gas substation. The matching of large-scale power devices of compressor and hydraulic pump is not required. The gas dispenser has no mechanical wear and extraordinarily low current consumption. The gas dispenser of the invention is the developing direction of the future.

Disclosed is a process of cyclically producing hexamethylolmelamine, comprising: adding a mother liquid and high-concentration formaldehyde aqueous solution in a hydroxylation reaction kettle; stirring and heating the solution in the kettle; adding alkali in the reaction kettle, and pre-adjusting a pH value of the solution in the kettle; then adding melamine in the reaction kettle; adding alkali again into the reaction kettle, and adjusting the pH value of the solution in the kettle; raising a temperature of the reaction solution in the kettle for reaction; introducing the solution in the kettle which has already been cooled into a centrifuge for centrifugal separation to obtain hexamethylolmelamine wet material and the mother liquid; delivering the hexamethylolmelamine wet material to a drying system for subsequent drying; returning the mother liquid back to the reaction kettle; and repeating the above steps for cyclic production. By using high-concentration formaldehyde, the present disclosure enables the mother liquid to be cyclically used for a production procedure, thereby substantially reducing the product costs and achieving zero-pollution emission.

The invention relates to a wastewater treatment process, and provides a comprehensive treatment process for high-concentration and high-salt wastewater, comprising the following steps: concentrating the wastewater, adding an organic flocculant, and settling large particles of impurities and most of the suspended matter and floating matter; Add activated carbon adsorbent to adsorb organic matter; filter to remove particulate impurities, colloidal substances and suspended solids in water, and then separate monovalent ions in wastewater through primary nanofiltration; water containing monovalent ions undergoes reverse osmosis to obtain pure Water can be used as industrial water; Concentrated water undergoes electrodialysis to concentrate monovalent salts to obtain NaCl by-products; Water containing divalent ions undergoes freezing and crystallization, and after centrifugation, the crystal layer undergoes double-stage membrane electrodialysis to obtain acid-base products. The water layer is treated by nanofiltration; the saturated adsorbent that has absorbed organic matter is dehydrated and dried for recycling. The invention has low cost, can simultaneously remove organic matters and inorganic salts in waste water and utilize them, and is energy-saving and environment-friendly.