141 results about "Coal gasification wastewater" patented technology

The invention discloses a gasification wastewater disposing method and device through single-tower pressurizing stripping, which comprises the following steps: entering the extracted of acid gas or ammonia gas of cold and hot coal gasification wastewater from band lateral line in the stripping tower from top and upper top; blending gas; dividing phases; washing; separating light oil and acid gas; preparing liquid ammonia through two-grade concreting and refining; separating crude phenol and organic solvent from bottom of tower through inversed-extracting autoclave liquid and organic solvent; recycling organic solvent through stripping. The gasification disposing device contains oil acid gas/ammonia stripping tower, extracting tower, acid gas washing tower, solvent stripping tower, solvent recycling tower, oil-water separator, dephlegmator, pump and reservoir.

This invention relates to a method to dispose and recycle coal-gasification sewage containing high-concentration hydroxybenzenes, which includes following steps: a) acid removal; b) hydroxybenzene removal by extraction; c) regeneration of extraction solvent; d) ammonia recycling and rudimental extraction solvent recycling. The extraction solvent is isobutyl methyl ketone. After disposal with this method, more than 92% hydroxybenzenes and 99.5% ammonia can be recycled from the sewage. The extractant can be regenerated by distillation separation. The regenerated extractant is high purified and can meet the requirement of circulative extraction. Besides, while hydroxybenzenes, especially polyphenols are effectively recycled, CODCr of the sewage is also greatly lowered, which is benefic to sewage biochemical standardization.

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.

The invention provides a coal gasification wastewater zero-emission treatment method, a treatment system and an application thereof. The treatment system provided by the invention can respectively perform biochemical treatment, desalting and concentrated saline treatment on coal gasification wastewater through a biochemical treatment unit, a desalting unit and a concentrated saline treatment unit, clear water produced by each step can be reused, the produced high-salinity concentrated water can enter the next step for treatment, evaporation is finally performed through an evaporation unit, the clear water produced after evaporation can be used for water supply of a boiler, and the produced concentrated water can be used for flushing ash and slag. The treatment system provided by the invention can realize wastewater zero-emission treatment so as to achieve the purpose of saving water resources.

The invention discloses a method for treating coal gasification wastewater. The method comprises steps of: (1) lime softening by first adding lime milk to the coal gasification wastewater to conduct chemical precipitation on calcium salt and magnesium salt with the lime milk, standing the precipitation and filtering an supernatant; (2) ozone oxidation by sending the wastewater filtered in the step (1) into an ozone oxidation device for treatment; (3) MBBR treatment by sending the wastewater subjected to ozone oxidation into an MBBR for treatment; (4) coarse filtration; (5) continuous membrane filtration or ultrafiltration; (6) reverse osmosis; and (7) multi-effect evaporation by conducting multi-effect evaporation on the concentrate obtained by reverse osmosis treatment, and further crystallizing the concentrate obtained by multi-effect evaporation. The method of the invention can effectively remove the main pollutants such as COD, ammonia nitrogen and chroma in coal gasification wastewater, can also greatly reduce the salt content of the wastewater, ensure the efficient and long-term running of the double membranes, and achieve zero discharge of coal gasification wastewater.

The invention relates to a method for treating wastewater containing phenol and ammonia, in particular to an energy-saving process for recycling the wastewater containing the phenol and the ammonia. Equipment among an acid removing tower, an ammonia removing tower and a water tower is coupled, namely a crude ammonia condenser on the top of the ammonia removing tower is taken as a reboiler of the acid removing tower and the water tower; and a differential pressure rectification technology is utilized, so that the step comprehensive utilization of a heat resource is realized, the energy consumption of wastewater treatment is reduced, and the using amount of steam and circulating water is greatly saved; particularly the equipment is coupled, the differential pressure rectification technologyis utilized and the ammonia and the phenol in the coal gasification wastewater are recycled simultaneously, so that the aims of saving energy and reducing emission in the wastewater treatment and recycling process are fulfilled. The technical problem that the energy consumption is high when the wastewater containing the phenol and the ammonia is recycled in the coal gasification process is solved; and the comprehensive utilization of energy is realized, and the method is high in social value and economic value.

The invention discloses a modified active carbon catalyst, and preparation and an application thereof, particularly discloses the catalyst for treatment of coal gasification wastewater through a catalytic wet hydrogen peroxide oxidation technology, and the preparation and the application thereof, and belongs to the fields of water treatment technology and environmental functional materials. The coal gasification wastewater is a by-product generated in a coal gasification process, contains a variety of high-concentration pollutants including a large amount of phenols, ammonia, sulfides, cyanides, tar and the like, and has poor biodegradability. Activated carbon as a carrier is loaded with rare earth metals La, Ce, Pr and Nd at low temperature to improve the activity, and the active carbon-based catalyst having larger specific surface area, high activity and high stability is prepared; after the catalyst is used for 240 h in a 80 DEG C atmospheric pressure system, the activity of the catalyst can still basically remain unchanged. Studies on harmless and resourceful treatment and reuse of the coal gasification wastewater are facilitated, and an important scientific and application significance is provided for establishment of corresponding demonstration projects.

The invention provides a treatment or recycling method and purpose for coal gasification and coal carbonization waste water. The method employs a combined technology of '' pretreatment + efficient + anoxic / aerobic treatment + efficient aeration biofilter + advanced treatment '' with details seen in a specification. The invention has advantages that efficient anoxic treatment not only eliminates organic pollutants in the waste water to reduce post treatment process load but also enhances waste water biodegradability; the efficient aeration biofilter efficiently gathers microbes growing slow, so as to improve processing effect on difficultly degraded organic matters and ammonia nitrogen in the waste water, guarantee stable operation of the integral combined technology and effectively mitigate process operating difficulty of the subsequent advanced treatment. The invention is suitable for standard reached discharging or recycling and present engineering reconstruction and upgrade of gasification and coal carbonization waste water, as well as standard reached discharging or recycling and present engineering reconstruction and upgrade of similar coal chemical industry waste water and waste water containing high density difficultly degraded organic matter.

The invention relates to a coal gasification wastewater processing method. The method comprises the following steps: carrying out coagulation processing and air floatation processing on coal gasification wastewater, sequentially carrying out aerobic biological processing, anaerobic biological processing and the aerobic biological processing by allowing the wastewater to flow through a first aerobic reactor, an anaerobic reactor and a second aerobic reactor, allowing parts of water discharged from the second aerobic reactor to return to the anaerobic reactor, and carrying out normal-temperature normal-pressure catalytic oxidation or carrying out Fenton oxidation and normal-temperature normal-pressure catalytic oxidation on the residual water.

The invention relates to an advanced treatment process for coal gasification wastewater, which comprises the following steps of: after regulating the pH value of the wastewater with acid, adding ferrous salt and hydrogen peroxide to oxidize organisms in the wastewater; then sequentially adding a first coagulant and a second coagulant to carry out coagulation after adding alkali to regulate the pH value; after precipitating to separate out coagulation substances, oxidizing the wastewater with oxygen-containing gas under the action of a catalyst at normal temperature and under normal pressure; and optionally carrying out sand filtration.

The invention relates to a coal gasification wastewater treating and recycling method and device. The coal gasification wastewater treating and recycling method comprises the following steps: carrying out medium-pressure steam stripping on coal gasification wastewater generated by coal pressure gasification, exchanging heat, preheating/cooling, sequentially carrying out shallow air-floatation, hydrolytic acidification, anaerobic-aerobic biological treatment, membrane biological reaction and ozone oxidation, adsorbing matters by using carbon, filtering by using multiple mediums, sequentially carrying out self-cleaning filtration, ultrafiltration, cartridge filtration, reverse osmosis and ion exchange adsorption, and feeding into a water feeding system of a high pressure boiler. The coal gasification wastewater treating and recycling method optimally combines various wastewater treatment methods and is used for solving the problems that after being treated, the coal gasification wastewater is difficult to reach the discharge standard, and the realization of zero discharge by recycling is difficult.

The invention discloses a purification technology for ammonia recycled from wastewater from coal gasification. According to the purification technology, coarse ammonia from a deamination tower is firstly washed by a purification tower to remove impurities such as partial phenols, H2S, organic sulfur, CO2 and oil and then is discharged from the top of the purification tower; after being condensed, ammonia is refined to obtain liquid nitrogen. The purification technology has the advantages of high efficiency, energy conservation, good purification effect and high recycled ammonia purity.

The invention relates to a treatment method for wastewater containing phenol and dissoluble amine salts produced in chemical industry production, and particularly relates to a phenol and ammonia wastewater recycling treatment method by using a single tower for performing de-acidification and de-amination simultaneously. By means of an energy-saving technology which uses a single device for decomposing amine salts and achieving separation and purification, the device investment is reduced; and the energy recycling is achieved by using a differential pressure rectification technology, so that the energy consumption is reduced. Specifically, a de-acidification and de-amination coupling tower is used, and side withdrawing and differential pressure rectification technologies are utilized for achieving a simultaneous de-acidification and de-amination process and recycling ammonia and phenol in coal gasification wastewater, and accordingly, the method is energy saving and emission reducing, the technological process is simplified simultaneously, and the operation difficulty is reduced. According to the phenol and ammonia wastewater recycling treatment method by using the single tower for performing de-acidification and de-amination simultaneously, technical problems of large device investment and high energy consumption in phenol and ammonia wastewater recycling in a coal gasification process are solved, the technological process is simplified through the coupling of devices, and high economic and social values are provided.

Treated water with good water quality which can be discharged or reused is obtained by efficiently removing SS, fluorine, cyanogen, selenium, ammonia, and COD components contained in coal gasification wastewater such as gas washing wastewater generated in a coal gasification step. A method of treating coal gasification wastewater comprising steps (1) to (4), wherein the step (1) is performed prior to the step (2): (1) a fluorine removal step in which fluorine is removed by coagulation sedimentation; (2) a cyanogen decomposition step in which cyanogen is decomposed by wet oxidation or thermal hydrolysis; (3) a selenium treatment step in which selenate ions are subjected to a reduction treatment with a metal reductant; and (4) a COD/ammonia removal step in which COD and/or ammonia are/is removed.

The invention relates to a new process for treating coal gasification wastewater with active coke, which comprises the following steps: first-stage absorption is carried out on coal gasification wastewater by directly using active coke to remove most of COD, suspended matters and chroma; after the absorption treatment, the outlet water enters an immobilized microbe-anaerobe filter chamber (hereinafter referred to as I-AF) and immobilized microbe-aerobe aeration biological filter (hereinafter referred to as I-BAF) system to be biologically treated, thereby removing most of ammonia nitrogen and COD in the wastewater; second-stage deep absorption is carried out on the outlet water performed by I-AF+I-BAF processing by using active coke; and the outlet water satisfies Grade 1 in Sewage Comprehensive Emission Standard GB8978-96. Compared with the traditional treatment process, the invention has the advantages of simple technical process, low treatment cost, favorable COD and ammonia nitrogen removal effect, small occupation area of facilities, and convenient operational management. In addition, the saturated active coke can be recycled by heating in the anaerobic atmosphere, and the phenols in the saturated active coke can be recycled or the saturated active coke can be directly used as fuel. The invention can be used for treating coal gasification wastewater, coked wastewater and the like at low cost, and has unique effects for treating various high-concentration industrial wastewaters and modifying the prior processes.

The embodiment of the invention discloses an ozone catalytic ozonation tower which comprises an oxidation tower body, an ozone generator, a circulating pump and a tail gas damage device, wherein the oxidation tower body comprises a first micro-porous aeration diffuser, a second micro-porous aeration diffuser, a catalyst layer, a water inlet, a water outlet, at least one oxidizing agent feeding hole, an exhaust port, a circulating water inlet and a circulating water outlet; the first micro-porous aeration diffuser is positioned at the bottom of the oxidation tower body; the second micro-porous aeration diffuser is positioned above the first micro-porous aeration diffuser; the catalyst layer is positioned above the second micro-porous aeration diffuser; the side wall of the oxidation tower body between the first micro-porous aeration diffuser and the second micro-porous aeration diffuser is sequentially provided with the water inlet and the circulating water inlet from bottom to top; the side wall of the oxidation tower body above the catalyst layer is sequentially provided with the circulating water outlet and the water outlet from bottom to top; the side wall of the oxidation tower body between the water inlet and the circulating water outlet is provided with at least one oxidizing agent feeding hole. The ozone catalytic ozonation tower is capable of reducing the dwell time of ozone in the tower and improving the ozone utilization rate.

The invention discloses a filler extraction tower for dephenolizing coal gasification wastewater and an extraction dephenolizing processing method. A honeycomb grid filler layer of the filler extraction tower comprises a plurality of rectangular plate pieces and a rectangular baffle plate in a hollow cavity of the extraction tower, and each rectangular plate piece and the rectangular baffle plateare both provided with a plurality of tongue type holes; the spacing of the two adjacent rectangular plate pieces is 50-70mm, the rectangular baffle plate is inserted between the rectangular plate pieces, and a whole structure is arranged between the rectangular plate pieces and the rectangular baffle plate; and the extraction dephenolizing processing method comprises the following steps: sewage enters the extraction tower from a distributor between an amplification section at the upper section and the honeycomb grid filler layer, countercurrent extraction is carried out on the sewage and an extraction solvent entering from a lower distributor, and the extraction temperature is 30-60 DEG C. The invention adopts the filler extraction tower to realize the industrial application of the coal gasification wastewater having high concentration and containing phenol and has the characteristics of high extraction efficiency, large processing quantity, simple operation, low operation expense, easy installation and maintenance and the like. The total phenol removing rate is as high as more than 93%.

The invention relates to a method for treating high-concentration phenol-ammonia coal gasification wastewater. The method takes butyl acetate as an extraction agent and comprises the steps of firstly extracting by use of a phenol extraction tower to remove phenols contained in the wastewater, removing the acid gas and ammonia in the wastewater by use of an acid and ammonia removal tower, and recovering the extraction agent in the extraction phase by use of a solvent stripping tower so as to obtain a crude phenol product from the bottom of the tower. The method provided by the invention realizes high-purity removal of the phenols, acid gas, free ammonia and solid ammonia in the coal gasification wastewater so as to meet the requirement of biochemical treatment on the inflow water quality, and obtains the crude phenol product and high-concentration ammonia gas. Compared with the prior art, the method provided by the invention has the advantages of good extraction effect, high phenol removal efficiency, short process flow and low treatment cost; the method is simple and convenient to operate, and the treatment quality is reliable.

The invention discloses an advanced treatment method for Lurgi coal gasification wastewater, relates to a sewage treatment method and aims to solve the problems that the discharged Lurgi coal gasification wastewater after being subjected to advanced treatment by using the traditional biochemical method still cannot meet the standard and a physic-chemical method is high in cost when being used for carrying out advanced treatment on the Lurgi coal gasification wastewater. The method comprises the following steps of: firstly, coagulation and absorption treatment; secondly, high-density sedimentation treatment; thirdly, advanced oxidation treatment; fourthly, continuous aeration and batch stirring treatment; fifthly, batch aeration biotreatment; and sixthly, V-shaped sand filter treatment to finish advanced wastewater treatment. The advanced treatment method has the advantage that the final effluent obtained through treating the Lurgi coal gasification wastewater by using the method provided by the invention can meet the recycling standard. The advanced treatment method is mainly used for advanced treatment of the Lurgi coal gasification wastewater.

The invention discloses a coal gasification wastewater treatment device. When the treatment device is used, the coal gasification wastewater of which partial suspended matters are removed by a regulating pool and a physical and chemical sedimentation pool enters a first biological oxidation pool from a first water inlet; after a short-range nitrification and denitrification reaction is performed on the coal gasification wastewater through a first carrier for the first time, the coal gasification wastewater flows into a second biological oxidation pool from a first channel; after the secondary short-range nitrification and denitrification reaction is performed on the coal gasification wastewater through a second carrier, the coal gasification wastewater flows into a third biological oxidation pool from a second channel; a denitrification reaction is performed through a third carrier and then a nitrification reaction is performed through a fourth carrier; and the coal gasification wastewater is discharged from a water pipe after the treatment process is finished, wherein the nitrification reaction is controlled at the nitrite stage during the short-range nitrification and denitrification reaction, so that the denitrification reaction is performed directly under the condition that nitrite is not further oxidized into nitrate; and thus the wastewater denitrification process is shortened. A supplementing device is used for supplementing a carbon source and alkalinity. The invention further provides a coal gasification wastewater treatment method.

The invention discloses a treatment method for coal gasification wastewater containing phenol and ammonia, which comprises the following steps: 1, introducing CO2 to regulate the pH value of the waste water; 2, extracting and removing phenol; 3, pressurizing and stripping to remove acidic gases and ammonia; 4, concentrating ammonia; and 5, recovering solvent. In the invention, the drawbacks of stripping phenol loss, pollution of phenol to ammonia product, high extraction temperature and the like of a process in which extraction is performed after stripping by cooling raw material waste water to 30 to 60 DEG C first, absorbing CO2 to regulating the pH value of the waste water to 7 to 8 and advancing a phenol extracting and removing process. Meanwhile, the treatment method has the advantages that: the system can be modified to an optimal extraction environment easily; heating is required once; carbon dioxide can be recovered and recycled; and the like. The coal gasification wastewater purified by the method meets the requirements of subsequent biological treatment completely.

The invention relates to the technical field of wastewater treatment, in particular to a coal gasification wastewater phenol and ammonia recovery process. The process comprises the following steps that feeding wastewater is divided into cold feeding materials and hot feeding materials to respectively enter an acid water stripping tower from the tower top and the tower middle upper part; the tower top pressure is set to be 0.9 to 1.2MPa; the tower top temperature is 50 to 80 DEG C; the tower kettle pressure is set to be 0.92 to 1.25 MPa; the tower kettle temperature is 178 to 188 DEG C; acid gas is produced at the tower top; ammonia water vapor is produced at the lateral line; the ammonia water vapor is sequentially used as a heat source of a phenol tower and a solvent stripping tower, and then enters a three-stage segregated system to be concentrated into crude ammonia gas; kettle liquid of the acid water stripping tower enters an extraction device to be subjected to phenol removal; an extraction phase enters the phenol tower; an extracting agent and crude phenol are separated through rectification; a raffinate phrase enters a solvent steam extraction tower; the extracting agent dissolved in the wastewater is stripped out and returns to an extraction tower. By using the process provided by the invention, the steam consumption can be greatly reduced; in addition, the good treatment effect can be ensured.

The invention provides a treatment method of coal gasification wastewater, which comprises the following steps: the coal gasification wastewater is sequentially subjected to anaerobic biological treatment, aerobic biological treatment and denitrification treatment; by using the methods and conditions of the anaerobic biological treatment and aerobic biological treatment, the COD (chemical oxygen demand) value of the coal gasification wastewater after the aerobic treatment and before the denitrification treatment is 350-500 mg/L, the total phenol content is 60-100 mg/L, the BOD (biochemical oxygen demand) value is 35-50 mg/L, and the total nitrogen content is 200-400 mg/L; and by using the conditions of the denitrification treatment, the COD (chemical oxygen demand) value of the coal gasification wastewater is lower than 350 mg/L, and the total nitrogen content is not higher than 60 mg/L. The method for treating coal gasification wastewater has the advantages of simple procedures, short treatment time and high efficiency, and can effectively remove total nitrogen in the wastewater to avoid eutrophication of the water body.