33results about How to "Save investment in environmental protection" patented technology

The invention discloses a process for treating and recovering dye industrial wastewater. The process comprises the following steps of: collecting cyclizing wastewater, adding a calcium hydroxide solution, reacting until the pH value is 5 to 7, and recovering a precipitate to obtain calcium hydrophosphate; adding the calcium hydroxide solution continuously, reacting until the pH value is 10 to 12,and recovering a precipitate to obtain calcium phosphate; adding an acidulant for neutralizing; collecting pigment wastewater, rectifying at the temperature of between 75 and 85 DEG C, and recoveringfractions to obtain ethanol; collecting soda boiling wastewater, mixing the soda boiling wastewater and the treated cyclizing wastewater and pigment wastewater to obtain mixed wastewater, adding the acidulant into the mixed wastewater, regulating the pH value to be 2 to 4, separating a precipitate out, and performing suction filtration and distillation on the precipitate to obtain benzoic acid; and performing primary materialization treatment, biochemical treatment and advanced treatment on the treated mixed wastewater sequentially, and discharging. According to the process, useful substancesin the dye wastewater are recovered, so that the production cost is saved, the load of the subsequent wastewater treatment process is reduced, the discharge of the wastewater can reach the standard, and the economic benefit is improved effectively.

The invention discloses a desalination and purification method of pentasodium diethylenetriamine pentaacetic acid (DTPA) and belongs to the field of chemical purification. The purification method comprises the steps of adding deionized water in a crude product pentasodium DTPA solution to obtain a diluent and regulating the pH (potential of Hydrogen) of the diluent to 11-11.5; carrying out desalination separation on the obtained diluent under the pressure of 1-3MPa by adopting a nanofiltration membrane with the molecular weight cut-off of 100-300, thus respectively obtaining a pentasodium DTPA desalination liquid and saline water; and continuously adding the deionized water in the pentasodium DTPA desalination liquid obtained through the separation and carrying out circular desalination separation under the pressure of 1-3MPa by adopting the nanofiltration membrane with the molecular weight cut-off of 100-300 till the salinity of the obtained pentasodium DTPA desalination liquid is below 0.5%. The method for removing the sodium chloride of the pentasodium DTPA has the advantages of high efficiency, rapidness, easiness in control and the like; in addition, by adopting the method, the pentasodium DTPA purifying yield can be up to more than 98%.

A wet dust removal device consisting of a dust removal system and a sewage treatment system. The dust removal system is composed of a gas deflector, a water spray pipe, a smoke and dust capture mechanism and a mist eliminator installed sequentially from bottom to top in the tower; the gas deflector It is composed of a group of wing-shaped deflectors arranged horizontally in the plane, and the smoke and dust capture mechanism is composed of a dust-collecting plate with dense meshes and a "herringbone"-shaped dust-collecting plate. Its sewage treatment system is composed of sewage tank, sewage pump, filter paper belt, water purification recovery mechanism, sludge drying mechanism and dust residue collection mechanism. This dust removal device can realize five-stage dust removal for dust-containing gas, and the dust removal rate is high. By increasing the number of layers of the dust capture mechanism, the dust removal rate for the gas containing particles above 5 microns can reach up to 98%; the resistance of dust-containing gas is small, Low energy consumption; dust removal and sewage treatment are integrated, which can reduce the footprint and investment of environmental protection equipment, and the dust removal sewage can be recycled after treatment, saving water resources.

The invention relates to a high strength light wall plate which is composed of a base material and a three-dimensional net rack embedded in the base material, wherein the base material is a mixture of cement, vitrified micro bubbles, an anti-crack agent and a plasticizing agent; the wall plate comprises the following components in parts by weight: 3-6 parts of cement, 1-2 parts of vitrified micro bubbles, 0.0005-0.002 part of anti-crack agent and 0.003-0.01 part of plasticizing agent. The wall plate has the advantages of lightening the structure load, reducing the engineering cost, expanding the indoor usable floor area, having no construction waste, being capable of recycling the waste and being energy-saving and environment-friendly and the like.

The invention belongs to the field of thermal power engineering and discloses a low-nitrogen-source pure oxygen combustion method. According to the method, low-nitrogen fuel is adopted, pure oxygen isused as combustion-supporting gas, the pure oxygen and the low-nitrogen fuel are conveyed separately, the ratio between the pure oxygen and the low-nitrogen fuel is controlled, four corner tangentialpure oxygen combustion is carried out in a combustion chamber, deep burnout of the low-nitrogen fuel is achieved, and thus the emission concentrations of CO and NOx are reduced. According to the low-nitrogen-source pure oxygen combustion method, pre-combustion nitrogen source reduction is achieved, NOx is completely eradicated or reduced from the source, and fuel heat energy conversion efficiencyis improved; and no fuel gas denitrification device is needed, the NOx combustion emission concentration is 5-100 mg / m<3>, the CO combustion emission concentration is 50-500 mg / m<3>, and combustion efficiency is 95% or above.