2925results about "Waste water treatment from gaseous effluents" patented technology

The invention discloses a desulfurization waste water zero discharging process. The process comprises a chemical dosing softening process and a microfiltration membrane treatment process; after incoming water is subjected to two-stage softening, nanofiltration and reverse osmosis separation are performed; sodium sulfate decahydrate with the purity of more than 99% is separated out by utilizing freezing crystallization; a reverse osmosis concentrated water regeneration sodium ion exchange device is utilized; sodium chloride with the purity of more than 98% is separated out by utilizing evaporative crystallization; solids are comprehensively utilized, and no liquid is discharged outside. The invention further provides a desulfurization waste water zero discharging system. According to the desulfurization waste water zero discharging process and the system, water in desulfurization waste water can be separated to be reutilized as domestic and industrial usable water, and other impurities in the desulfurization waste water are separated in solid form, so that pollutants harmful to the natural environment do not generate, and the problem that the desulfurization waste water pollutes the environment can be completely solved.

To include a boiler 11 that burns fuel F, an air heater 13 that recovers heat of flue gas 18 from the boiler 11, a first precipitator 14 that reduces dust in the flue gas 18 after heat recovery, a desulfurizer 15 that reduces sulfur oxides in the flue gas 18 after dust reduction by an absorbent, a dewaterer 32 that reduces gypsum 31 from desulfurization discharged water 30 discharged from the desulfurizer 15, a spray drying device 34 including an atomizer that atomizes a dewatering filtration fluid 33 discharged from the dewaterer 32, and a flue-gas introducing line L₁₁ that introduces a part of the flue gas 18 into the spray drying device 34.

A portable water recycling and treatment system and process for used and produced flowback frac water pumps the water from a collection tank through a series of dedicated hydration, retention and filtering tanks and vessels that provide treatment for the removal of chemicals, sediments and other containments. The system, which is enclosed, can be readily assembled on-site by interconnecting the dedicated tanks, vessels and pumps. The tanks and vessels may be situated in a plurality of trailers/units that are transported separately to the site.

Hybrid copolymers for use as anti-scalant and dispersant. The polymers are useful in compositions used in aqueous systems. The polymers include at least one synthetic monomeric constituent that is chain terminated by a naturally occurring hydroxyl containing moiety. A process for preparing these hybrid copolymers is also provided.

The invention relates to a method for carrying out desalination and zero-discharge processing of power plant desulphurization wastewater by adopting an electrodialysis technology. The method comprises the following steps: neutralizing, precipitating, coagulating and filtering the power plant desulphurization wastewater and removing CODs (Chemical Oxygen Demands), heavy metals, F-ions, gypsum, silicon dioxide, hydroxide of iron and aluminum and other insoluble particles in waste water; separating C1-ions and other monovalent ions in clear liquid from SO3<2->, SO4<2-> and other divalent ions through nanofiltration; desalinating and concentrating water produced by the nanofiltration by adopting a multistage countercurrent reverse electrodialysis method. The method has the advantages that the concentration of the Cl-ions in nanofiltration concentrated water and electrodialysis freshwater generated by the method is lower, and the nanofiltration concentrated water and the electrodialysis freshwater can be returned for flue gas desulfurization; the content of NaCl in a small amount of electrodialysis concentrated water produced reaches above 12 percent, the bivalent ions and other impurities are removed by nanofiltration, and the electrodialysis concentrated water is further evaporated and concentrated, so that chlorine-alkali industry electrolytes and NaCl salt can be obtained. Through the method, the zero-discharge treatment and the resource utilization of the desulfurization wastewater can be realized.

The invention discloses a treatment method of sintering flue gas desulphurization wastewater, which completes the treatment on the sintering flue gas desulphurization wastewater through the following five steps of: 1. neutralization and coagulation: regulating the pH value of the sintering flue gas desulphurization wastewater to 8.5 to 9.5 by lye, and adding 0 to 200ppm of coagulating agents; 2. flocculation: adding 0 to 10ppm of coagulant aids for forming flocs; 3. precipitation and filter liquor separation; 4. biochemical treatment on filter liquor; and 5. deep treatment. The treatment method can be used for reducing the treatment cost of the desulphurization wastewater without generating influence on other treatment systems, thereby having good application and popularization prospects.

A zero discharge process for separating sludge and salt from desulfurization wastewater includes a pretreatment process, a membrane treatment process and an evaporative crystallization process; in the pretreatment process, the desulfurization wastewater enters a raw water tank, an aeration fan introduces compressed air into the raw water tank, and the wastewater is lifted to first-stage reaction and clarification by a raw water pump; in the membrane treatment process, the incoming wastewater is first filtered by ultrafiltration, then enters a pH adjustment tank, and is pumped into a nanofiltration membrane separation system and a reverse osmosis membrane separation system; in the evaporative crystallization process, the incoming wastewater is first subjected to two-stage preheating, then enters a degasser, and finally enters an evaporative concentration system and a crystallization system.

Methods and systems for separating hydrogen and sulfur from hydrogen sulfide(H₂S) gas. Hydrogen sulfide(H₂S) gas is passed into a scrubber and filtration unit with polysulfide solution. Interaction frees elemental sulfur which is filtered, excess continues to a stripper unit where the excess H₂S is removed. The excess H₂S returns to the scrubber and filtration unit, while the sulfide solution passes into a photoreactor containing a photocatalyst and a light source. The sulfide solution is oxidatively converted to elemental sulfur and complexed with excess sulfide ion to make polysulfide ion, while water is reduced to hydrogen. Hydrogen is released, while the polysulfide solution is fed back to the scrubber unit where the system operation repeats. In a second embodiment, the photocatalyst is eliminated, and the hydrogen sulfide solution is directly illuminated with ultraviolet radiation with a light source such as a low pressure mercury lamp operating at approximately 254 nm.

A method for controlling treatment of an industrial water system is disclosed. The method comprises the steps of providing an apparatus for controlling delivery of at least one treatment chemical, the apparatus comprising at least one sensor and an electronic input/output device carrying out a protocol; measuring a parameter of the industrial water system using the at least one sensor; relaying the measured parameter to the electronic device; adjusting the protocol based on the measured parameter; delivering a concentrated treatment chemical into a stream of the industrial water system according to the adjusted protocol, the concentrated treatment chemical comprising an active ingredient, the active ingredient traced as necessary, the active ingredient having a concentration; repeating the measuring, the adjusting, and the delivering; and optionally repeating the steps for n-number of parameters, n-number of active ingredients, and/or n-number of concentrated treatment chemicals.

The invention discloses a method for processing coal gasification wastewater. The method sequentially comprises the following steps: a. carrying out preprocessing on the coal gasification wastewater in a preprocessing step comprising oil removal processing, coagulation processing and optional adjustment processing; then b. leading the preprocessed coal gasification wastewater to sequentially flowthrough a first-class bio-contact oxidation reactor, a biological electrochemical reactor, a second-class bio-contact oxidation reactor and an optional third-class or multi-class bio-contact reactor to carry out biological processing; and c. leading the biologically processed coal gasification wastewater to carry out catalytic oxidation processing in a catalytic oxidation reactor.

A method of removing one or more heavy metals including mercury from industrial wastewater by use of a filtration and/or a solid-liquid separation system by use of a water soluble ethylene dichloride ammonia polymer.

The invention discloses a method for zero emission treatment of desulfured waste water. The method comprises the following steps: 1) discharging the desulfured waste water obtained after desulfuration in a desulfuration tower into a preliminary sedimentation tank, carrying out primary separation in the preliminary sedimentation tank, and transporting an upper clear liquid separated out to a buffer pool through a slurry pump; 2) successively passing the desulfured waste water in the buffer pool through an atomization plant and a static dust catcher; 3) transporting the waste water which is from the lower part of the preliminary sedimentation tank and has large solid content to a filter press through an another sludge pump; and 4) feeding the waste water filtered back to the preliminary sedimentation tank through the slurry pump. Simultaneously, the invention also discloses a system for zero emission treatment of desulfured waste water. The zero emission treatment is conveniently carried out on the desulfured waste water through the method, the process is simple and labor is saved; and the system has a compact structure, the method is simple to implement, energy is saved, the quality of smoke at the inlet of the dust catcher is improved, the zero emission of the desulfured waste water can be really achieved, thus the system has the advantage of popularization value.

Uses for a composition comprising a polymer derived from at least two monomers: acrylic-x and an alkylamine, wherein said polymer is modified to contain a functional group capable of scavenging one or more compositions containing one or more metals are disclosed. These polymers have many uses in various mediums, including wastewater systems.

An air purifier comprises a cleaning tower having an internal space communicating with a suction port and a discharge port, a blower for taking air from the suction port into the internal space of the cleaning tower and send it from the discharge port to the outside of the cleaning tower, and nozzles disposed in the internal space of the cleaning tower and spraying water in the internal space of the cleaning tower. The water sprayed from the nozzles is brought into contact with the air supplied by the blower in the cleaning tower.

A related desulphurization waste-water zero discharge processing system comprises a neutralization adjusting basin, a coagulation sedimentation basin and a flocculation sedimentation basin which are in successive connection. In the flocculation sedimentation basin, a supernatant formed in a specially-produced metering water channel flows into a supernatant processing device, and the lower dense liquid flows into a lower-dense-liquid processing device. The supernatant processing device comprises a full-automatic softening filter, an ultrafilter, a first-grade RO (reverse osmosis) device and a second-grade RO device; the outlet of the second-grade RO device is connected with a dense liquid tank and a pure water tank, pure water in the pure water tank is reusable, and a dense liquid in the dense liquid tank enters a crystallization evaporator for generating a salt. The lower-dense-liquid processing device discharges solid waste. Wastewater separated from a sewage concentration tank is discharged into the neutralization adjusting basin via a pipe for cyclic once-more processing. The technical scheme is combined with an advanced membrane technology, the technological flow is simple, energy-saving and environment-friendly, environment protection benefit is obviously increased, a new zero-discharge technology is realized, and the technical scheme possesses significant meaning on water pollution treatment.

This invention relates to improved methods, processes and apparatus for the removal of sulfides from a gas, liquid or solid (substance) wherein the substance is contacted with an aqueous solution. The instant invention presents methods and processes wherein at least one of H₂S, SO₂ and CS₂ is chemically converted in an aqueous media to a salt and/or compound comprising sulfur and a cationic moiety. Said salt and/or compound comprising sulfur and a cationic moiety is herein termed a “Sulfur Salt”. After formation of the Sulfur Salt, the Sulfur Salt is converted to elemental sulfur with a bacterium capable of metabolizing sulfur. The preferred bacterium for metabolizing sulfur is a strain from the genus Thiobacillus. The most preferred strain from the genus Thiobacillus is Thiobacillus denitrificans. The instant invention prefers an aqueous operating pH of between 6.0 and 8.0, while the most preferred aqueous pH is between 6.0 and 7.0.

An object of the present invention is to provide a process and an apparatus for treating an aqueous medium at low running costs with a decreased electricity required for hydrothermal electrolytic reaction. The present invention proposes a two-step process comprising a first step of performing a conventional hydrothermal reaction or a conventional electrolytic reaction prior to hydrothermal electrolytic reaction to degrade readily degradable substances or ammonia or various electrolytically degradable organics and then a second step of performing hydrothermal electrolytic reaction to degrade the remaining organics, whereby the electricity consumed by hydrothermal electrolytic reaction in the second step can be greatly reduced.

The invention relates to a coal gasification ash water treatment method. The problem that in the prior art, gasified fine residue is too high in carbon residue and reused ash water contains plenty of suspended particles is solved mainly. The ash water treatment method comprises the steps that black water coming from a gasification furnace and a washing tower undergoes two-stage or three-stage flash evaporation and concentration and then enters a thickener; under the stirring effect, the black water coming from the thickener is divided into two layers, floating bead slurry of the upper layer overflows and enters an ash water circulation system or a sedimentation tank after floating beads are separated; the concentrated black water of the lower layer enters a carbon residue classifier, carbon residue undergoes floatation, tailing slurry of a lower layer of a floatator; supernatant of a settling tank enters the ash water circulation system, and lower layer turbidity solution of the settling tank enters a filter to be dehydrated to obtain filter cake (gasified fine residue). By adopting the ash water treatment method, the carbon residue content of the coal gasified fine residue can be reduced, the utilization of the gasified fine residue is facilitated, and the suspended particles in reused ash water can be reduced.

The invention discloses a system and a method for softening treatment of desulfurization wastewater of a coal-fired power plant. A primary reaction tank, a primary clarification tank, a secondary reaction tank and a secondary clarification tank are arranged, lime milk, sodium sulfate, polymeric ferric sulfate and polyacrylamide are added to the primary reaction tank for a primary reaction and clarified through the primary clarification tank, Mg(OH)2 and CaSO4*2H2O in the wastewater after the primary reaction are removed, the mixture has a secondary reaction in the secondary reaction tank, smoke is fed into the secondary reaction tank and is settled in the secondary clarification tank, CaCO3 is settled, and softening treatment of the desulfurization wastewater of the coal-fired power plant is completed. The system is simple in structure and easy to implement and facilitates industrial production; when the softening treatment effect is met, that is, the content of Mg<2+> is smaller than or equal to 5 mg/L and the content of Ca<2+> is smaller than or equal to 5 mg/L, the adding amount of chemical is reduced, and the chemical operation cost is reduced, so that the operation cost of a zero discharging system for the desulfurization wastewater of the coal-fired power plant is reduced, and the system has important economic benefits and environmental benefits.

A method of removing suspended solids from a gasification process water stream includes, in an exemplary embodiment, providing a gasification process water stream containing process derived suspended solids, settling at least a portion of the suspended solids from the process water stream in a settling apparatus, providing a filter apparatus having a plurality of filter elements, and removing a portion of the settled solids from the settling apparatus. The method also includes precoating the filter elements with the settled solids removed from the settling apparatus, directing a portion of the process water stream from the settling apparatus to the filter apparatus, and filtering the portion of the process water stream directed from the settling apparatus through the precoated filter elements to remove suspended solids particles to form a filtrate.

In certain embodiments, a system includes a gasification system configured to output grey water. The system also includes a grey water zero liquid discharge (ZLD) system configured to receive the grey water and to generate a first stream of distillate. The grey water ZLD system comprises an ammonia stripping system. An amount of water into and out of the grey water ZLD system is approximately equal.