42results about How to "Achieve zero discharge treatment" patented technology

The invention discloses a hot-dip galvanizing waste acid resource treatment method, which comprises: (1) adding an oxidizing agent to hot-dip galvanizing waste acid to oxidize Fe<2+> ions in the waste acid into Fe<3+> ions, adjusting the pH value of the waste acid to 4.5, generating Fe(OH)3 precipitate from the Fe<3+>, carrying out solid-liquid separation, recovering the Fe(OH)3 precipitate, and performing the next step on the filtrate; (2) adjusting the pH value of the filtrate obtained in the step (1) to 9.5, generating the corresponding insoluble salt precipitate from the heavy metal ions, carrying out solid-liquid separation, and performing the next step on the filtrate; and (3) adjusting the pH value of the filtrate obtained in the step (2) to a neutral pH value, heating and evaporating the filtrate, carrying out crystallizing precipitating and recovering on the soluble salt in the filtrate, and reusing the condensed water produced during the evaporation process. According to the present invention, with the method, the separation between the iron and the heavy metal and the efficient recovery of the iron are achieved, the heavy metal hazardous waste achieves the decrement treatment requirement, the operating cost of the whole system is reduced, the workload of the follow-up treatment unit is reduced, and the zero discharging treatment of the waste acid is achieved.

The invention provides an ion exchange resin wastewater zero-emission treatment method, relates to the field of wastewater treatment and aims to provide a low-cost environmental-friendly wastewater treatment method. The method comprises the following steps: S01, performing anion-cation exchange, namely introducing wastewater into a cation exchanger and an anion exchanger in sequence, extracting an acid regenerated waste liquid from the cation exchanger, and extracting an alkali regenerated waste liquid from the anion exchanger; S02, performing diffusion dialysis, namely introducing the acid regenerated waste liquid into a diffusion dialysis anion membrane to form an acid regenerated liquid and a waste acid liquid, and introducing the alkali regenerated waste liquid into a diffusion dialysis cation membrane to form an alkali regenerated liquid and a waste alkali liquid; S03, performing neutralization separation, namely respectively introducing a diffusion dialysis waste acid liquid and a diffusion dialysis alkali liquid into a neutralization separation unit, neutralizing the diffusion dialysis waste acid liquid and the diffusion dialysis alkali liquid, discharging organic matters through air flotation, forming a precipitate from divalent or more ions, and collecting the residue as a neutralized waste liquid; S-4, treating with a bipolar membrane, namely introducing the neutralized waste liquid into a bipolar membrane unit, finally converting into an acid regenerated liquid and an alkali regenerated liquid, and collecting the residue as light salt brine.

The invention discloses a system and a technology for zero discharging of high-salinity wastewater. A pre-processing system is adopted for removing hardness, basicity, heavy metal ions, COD, and the like, from high-salinity wastewater, so that the high-salinity wastewater can meet the water quality standard for nanofiltration membrane separation; nanofiltration is adopted for realizing the separation of divalent saline ions (SO42-), Na+, Cl and NO3-, and the like, in strong brine; the divalent saline ions (SO42-) exist in concentrated water; Na+, Cl and NO3- exist in generated water; a solventis added for reducing the solubility of sodium sulfate, so that high-purity sodium sulfate can be separated out; separation and recycling of desalted water and solvent are realized by crystallizing desalted water and keeping liquid state of solvent in the manner of cooling on the basis of the feature that the melting point of solvent is far lower than that of water. The system disclosed by the invention is simple in operation, high in running stability and capable of efficiently energy-saving realizing zero discharging of high-salinity wastewater.

The invention relates to the technical field of environmental engineering and aims to provide a zero emission treatment device and method for late-stage landfill leachate. The device and method can improve overall reaction efficiency of partial nitrification-anaerobic ammonia oxidation, realize zero emission treatment of the landfill leachate and remove phosphorus, organic matters and heavy metalions in the landfill leachate. According to the technical scheme, the zero emission treatment device for late-stage landfill leachate is characterized by comprising a regulating tank unit, a partial nitrification-anaerobic ammonia oxidation integrated reactor unit, a carbonization tank unit, a denitrification tank unit, a spirulina-nitrification tank unit, a sedimentation tank, a membrane filtration system unit and an intelligent control system, wherein the partial nitrification-anaerobic ammonia oxidation integrated reactor unit comprises a partial nitrification tank unit and an anaerobic ammonia oxidation reactor unit; the spirulina-nitrification tank unit comprises a spirulina tank unit and a nitrification tank unit; the membrane filtration system unit comprises a microfilter, a nanofilter and an ultrafilter.

The invention discloses a recycling treatment agent for zero discharge of rolling waste liquid and also discloses a treatment method for achieving zero discharge of rolling waste liquid by adopting the recycling treatment. The treatment method can achieve thorough oil-water separation of rolling waste emulsion, a separated-out oil product can be mixed with rolled crude oil in proportion for reuse,a water phase can be used for daily water supplementation of a rolling mill, and accordingly zero discharge treatment of the waste emulsion is achieved. After the oil phase separated by the recyclingtreatment agent is blended with the rolled crude oil, the lubricating property of the obtained mixed oil is equivalent to the lubricating property of the rolled crude oil.

A separated flotation tank-capacitive deionization membrane distillation technology combined electroplating wastewater purifying and recycling process system belongs to the technical field of wastewater treatment and is formed by connecting a water inlet tank, a membrane distillation heating tank, a pH regulating tank, an air floatation tank, a capacitive deionization membrane distillation reactor, a condenser, a power supply, a computer and a clean water tank. High-salinity industrial wastewater such as electroplating wastewater is pretreated by using an air flotation method, volatile pollutants such as ammonia nitrogen and cyanide in the wastewater are efficiently removed, and heavy metals and salt substances in the wastewater are further adsorbed, intercepted and recycled through the process of a capacitive deionization membrane distillation reactor, so the heavy metals in the electroplating wastewater are efficiently intercepted and recycled, the effluent water quality is highly purified, the zero discharge treatment of the electroplating wastewater is achieved, the air flotation pretreatment process and the introduction of the electrode plate in the capacitive deionization membrane distillation reactor significantly alleviate the membrane pollution/membrane wetting trend of the distillation membrane, the service life of the distillation membrane is prolonged, and the operation cost of membrane cleaning/membrane replacement is reduced.

The invention discloses an environment-friendly treatment device for industrial waste rubber. The device comprises a microwave cracking system (1), a closed oxygen-isolating feed transmission system (2), a waste gas purification treatment system (3), a hot air circulation system (4) and a discharge system (5). The closed oxygen-isolating feed transmission system (2), the waste gas purification treatment system (3), the hot air circulation system (4) and the discharge system (5) are all connected to the microwave cracking system (1). The environment-friendly treatment device provided by the invention has reasonable structural design and strong environmental friendliness, and adopts the microwave heating cracking and environment-friendly waste gas purification treatment system to perform high temperature cracking treatment on waste tires, and can effectively adsorb and remove pollutants such as soot, aliphatic hydrocarbon, aromatic hydrocarbon, dioxin, carbon monoxide and sulfur-containing compounds, the practicability is high.

The invention discloses a steel wet desulphurization wastewater treatment system and method. The method comprises the following steps: carrying out plate-and-frame pressure filtration, secondary chemical hardness removal, concentration precipitation on steel wet desulfurization wastewater, conducting filtration treatment to remove impurities in the wastewater, carrying out deamination treatment to remove ammonia nitrogen in the wastewater, and carrying out softening treatment, nanofiltration membrane treatment, membrane treatment or electrodialysis treatment and evaporative crystallization treatment to obtain clear water and high-purity sodium sulfate and sodium chloride. According to the method, complex factors such as gypsum suspended solids, high hardness, high chloride ions, high ammonia nitrogen, high sulfate ions, fluorine ions, heavy metal ions and COD in the wastewater can be effectively removed, the obtained clear water can be recycled as industrial new water, and zero discharge treatment of the steel wet desulfurization wastewater is realized; and high-purity sodium chloride and sodium sulfate salt with certain economic recovery value are obtained, so that recycling of resources is realized.

The invention discloses a method for treating landfill leachate by using biofilm sponge as a biological evaporating expanding agent and a biological carrier in combination with MVC. The method adopts an MVC system, preparation of biofilm sponge and a biological evaporating system. The biofilm sponge is prepared through inoculating polyurethane sponge with activated sludge and carrying out aerating and cultivation for acclimation; the leachate is subjected to MVC evaporation treatment to generate a concentrated liquor, and the concentrated liquor is treated through biological evaporation technology. According to the invention, metabolic heat generated by degradation of organic pollutant microorganisms in the MVC concentrated liquor is utilized to evaporate water in the concentrated liquor; the biofilm sponge which is light in weight, is easily available and is short in culture period and free of secondary pollution is used as the biological evaporating expanding agent and the biological carrier, and heat in the concentrated liquor and condensate water generated by MVC treatment are utilized for the needs of a heat source in the biological evaporating process, so that heat energy in the whole system is recycled to the maximum extent. Problems in the conventional pure physical separation process are overcome, and not only can water in the leachate be evaporated, but also polluting substances in the leachate can be reduced.

The invention relates to the field of desulfurization wastewater treatment, particularly to a desulfurization wastewater resourceful treatment system and a desulfurization wastewater resourceful treatment method. The desulfurization wastewater resourceful treatment system comprises a triple box mechanism, a lime milk flocculation mechanism, a mirabilite flocculation mechanism, a soda ash flocculation mechanism, a nanofiltration mechanism, a membrane distillation mechanism and a bipolar membrane electrodialysis mechanism, wherein the triple box mechanism, the lime milk flocculation mechanism, the mirabilite flocculation mechanism, the soda ash flocculation mechanism, the nanofiltration mechanism, the membrane distillation mechanism and the bipolar membrane electrodialysis mechanism are sequentially communicated, and the nanofiltration mechanism is communicated with the mirabilite flocculation mechanism. According to the desulfurization wastewater resourceful treatment system provided bythe invention, the desulfurization wastewater of a coal-fired power plant can be resourcefully utilized, and zero-discharge treatment of the wastewater can be realized.

The invention relates to a preparation method of pigment-grade iron oxide red, in particular to a method for preparing iron oxide red by utilizing iron-containing pickling waste liquid. The method comprises the following process steps of: generating ferrous hydroxide, generating seed crystal delta-FeOOH, generating a-Fe2O3 crystal nucleus, carrying out in-situ reaction, preparing solid iron oxide red and calcium chloride and the like. The method effectively solves the problems of high production cost, low space-time efficiency and the like in the prior art, and has the advantages that the economic benefit is remarkable, the operation cost is low, and the product meets the relevant requirements of the national standard.

According to the treatment system and method for realizing zero emission of the landfill leachate and the fermented biogas slurry. The landfill leachate and the fermented biogas slurry are subjected to thermal extraction twice, most ammonia nitrogen in the wastewater is removed, and ammonia water is obtained after condensation; residual ammonia nitrogen and volatilizable small molecular COD in thewastewater are removed by adopting a mechanical vapor recompression technology (MVR for short) and a forced circulation flash evaporation technology, and the wastewater is fed into a biochemical reactor for biochemical treatment to obtain regenerated return water; and innocent treatment is performed on the residual high-concentration waste liquid. Therefore, zero emission of landfill leachate andfermented biogas slurry is realized. By adopting the system and the method disclosed by the invention, the wastewater can be completely recycled, the zero-emission treatment of high-ammonia-nitrogenand high-COD landfill leachate and fermented biogas slurry is realized, the biodegradability of the wastewater is improved, the produced ammonia water can bring certain economic benefits, the operation and investment cost of the system is reduced, the heat energy in the system is repeatedly recycled, and the system has the characteristics of low energy consumption, and high efficiency.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a zero-discharge treatment method and system for coking ammonia distillation wastewater. According tothe zero-discharge treatment method for coking ammonia distillation wastewater, the coking ammonia distillation wastewater is sequentially subjected to ozone pre-oxidation, air floatation, electrocatalytic oxidation, an A/O biochemical process, precipitation, flocculation, ozone catalytic oxidation, a biological aerated filter process, ultrafiltration membrane filtration, nanofiltration membrane filtration and reverse osmosis membrane treatment; the electrocatalytic oxidation hydraulic retention time is 10-60 min; an anode plate is a lead-rhenium coating electrode, a cathode is a graphite carbon electrode, the distance between polar plates is 3-10 cm, and the current density is 5-20 mA/cm<2>. According to the treatment method, the treatment cost is low, deep treatment is achieved, the treated coking ammonia distillation wastewater is recycled, and zero emission is truly achieved. The invention further provides the coking ammonia distillation wastewater zero-discharge treatment system which is convenient to operate.

The present invention provides a chloride ion passivant. The passivant comprises the following components in percentages by mass: 0.001-0.2%of an amine, 0.0001-0.01% of an ester, and the balance of water, wherein the amine is polyacrylamide and/or alkenylamine, and the ester is an acrylic acid-acrylate copolymer or an acrylic acid-AMPS-maleic anhydride terpolymer. The invention also provides a preparation method of the chloride ion passivant; and the invention also provides a treatment method for desulfurization wastewater, wherein the treatment method uses the above chloride ion passivant. According to the treatment method, after the passivant is added into the desulfurization wastewater, chloride ions are deactivated, chloride ion corrosion is inhibited, the desulfurization wastewater isconverted into non-corrosive ordinary wastewater for evaporation and crystallization treatment, so that the investment costs of the system are significantly reduced, the service life of the system isgreatly prolonged, the reliability of the system is greatly improved, no by-products appear, zero discharge treatment of the desulfurization wastewater is realized, and the water resource environmentis protected.

The invention discloses a system and a process for realizing zero discharge of wastewater by contacting dry and cold carrier gas with hot wastewater, comprising: a heat exchange device for heating wastewater, a wastewater outlet of which is connected with a spray layer at the top of an evaporation device; the bubbling device is arranged in the evaporation device, and a nozzle of the bubbling device is inserted into wastewater; an inlet of the fan is communicated with a gas source, an outlet of the fan is connected with a gas inlet of the bubbling device, and the fan is used for providing dry and cold carrier gas for the bubbling device; the straight-through flow guide device comprises a plurality of liquid distribution elements which are vertically arranged in parallel, and the straight-through flow guide device is arranged in the evaporation device and located above the preset liquid level of the wastewater. The dry and cold carrier gas is subjected to shallow bubbling below the wastewater liquid level of the evaporation device through the bubbling device to generate a main concentration process. The temperature and the humidity of the carrier gas after the main concentration process are increased, the evaporation efficiency of the waste water is reduced, at the moment, secondary heat exchange and mass transfer are carried out on the carrier gas and the sprayed waste water in the straight-through flow guide device, and the straight-through flow guide device can be effectively prevented from being scaled and blocked.