CN112811710A - Wastewater treatment device and process in xylitol processing - Google Patents

Wastewater treatment device and process in xylitol processing Download PDF

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Publication number
CN112811710A
CN112811710A CN201911122807.1A CN201911122807A CN112811710A CN 112811710 A CN112811710 A CN 112811710A CN 201911122807 A CN201911122807 A CN 201911122807A CN 112811710 A CN112811710 A CN 112811710A
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wastewater
tank
reactor
sludge
nickel
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苏玉庆
郭效鹏
常海平
张美娜
雷天埌
王文英
黄玉海
郑学东
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Anyang City Yuxin Xylitol Technology Co ltd
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Anyang City Yuxin Xylitol Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/02—Preparation of sulfur; Purification
    • C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/08—Production of synthetic natural gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C10L3/101—Removal of contaminants
    • C10L3/102—Removal of contaminants of acid contaminants
    • C10L3/103—Sulfur containing contaminants
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly discloses a wastewater treatment device in xylitol processing, which comprises: the anaerobic reactor is connected with the adjusting tank pipe and the sedimentation reactor pipe, the sedimentation reactor is connected with the adjusting tank pipe through a water pump, and the filtering equipment is arranged; the biogas desulfurization device is connected with the anaerobic reactor pipe; an aeration tank connected with the anaerobic reactor pipe; and the sedimentation tank is connected with a water outlet pipe of the aeration tank, and the sedimentation tank is connected with a municipal sewage treatment plant through a pipe. The device can remove nickel, high sulfate radical and COD in the wastewater by combining a plurality of devices, and has high efficiency and low cost compared with the traditional chemical method for treating the nickel wastewater and only by an anaerobic process.

Description

Wastewater treatment device and process in xylitol processing
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment device and a wastewater treatment process in xylitol processing.
Background
In a common process for producing xylitol by using hemicellulose as a raw material, the produced wastewater has the characteristics of high COD (chemical oxygen demand) and high sulfate radical, and a Raney nickel catalyst is used in a hydrogenation procedure, so that the wastewater contains heavy metal nickel;
the traditional wastewater treatment process has the following defects: 1. the nickel-containing wastewater is separately treated by a chemical method, so that the wastewater treatment cost is higher; 2. the traditional anaerobic process can not treat high sulfate radical wastewater, and COD removal depends on a heavy-load activated sludge aeration process, so that the operating cost of a sewage station is further increased.
Based on this, how to reduce the cost of wastewater treatment is a technical problem that needs to be solved by the technicians in the field at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a device and a process for treating wastewater in xylitol processing.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a wastewater treatment device in xylitol processing comprises:
the regulating tank is used for receiving the production wastewater and regulating the pH value of the wastewater;
an anaerobic reactor for receiving the wastewater discharged from the regulating tank and decomposing organic matters in the wastewater into CO2、CH4、H2O and H2S, forming mixed methane;
a precipitation reactor connected with the anaerobic reactor tube and used for receiving partial marsh gas and carrying out precipitation reaction on the marsh gas and nickel wastewater generated in the xylitol production process to generate NiS so as to remove H2S and nickel in the nickel wastewater, and the precipitation reactor is connected with a regulating reservoir pipe through a water pump;
a filtering device for filtering the NiS generated in the precipitation reactor;
a biogas desulfurization device connected with the anaerobic reactor tube and used for receiving the residual biogas to remove H in the biogas2S is removed, and the removed H is2S is introduced into a bioreactor to be converted into sulfur;
an aeration tank connected with the anaerobic reactor pipe to accommodate the wastewater treated in the anaerobic reactor and decompose the residual carbohydrate to generate CO by aerobic bacteria in the aeration tank2And H2O；
And the sedimentation tank is connected with a water outlet pipe of the aeration tank and used for storing the wastewater discharged by the aeration tank and settling the floating objects in the wastewater, and the sedimentation tank is connected with a municipal sewage treatment plant pipe.
The sludge concentrating device further comprises a sludge concentrating tank and a filter press, wherein the sludge concentrating tank is used for concentrating sludge formed by the sedimentation of floaters in the sedimentation tank and discharging the concentrated sludge into the filter press for dehydration treatment.
Further, the sedimentation tank is connected with the aeration tank through a sludge reflux pump.
Further, the filtering equipment is a plate frame or a belt filter.
Further, the sedimentation tank is a radial flow sedimentation tank.
Further, the regulating tank and the anaerobic reactor, the sedimentation reactor and the regulating tank, the sedimentation reactor and the filtering equipment and the anaerobic reactor and the aeration tank are connected through water pumps.
A xylitol processing wastewater treatment process for the xylitol processing wastewater treatment device comprises the following steps:
step 1: enabling the wastewater containing high COD and high sulfate radicals to pass through a regulating reservoir, and adding hydrochloric acid or sodium hydroxide into the regulating reservoir to regulate the pH value of the wastewater to be 6.5-7.8;
step 2: after the pH value of the wastewater is adjusted, pumping the wastewater into an anaerobic reactor, keeping the temperature in the anaerobic reactor at 30-37 ℃, enabling carriers with anaerobic microorganisms in the anaerobic reactor to flow in the wastewater to adsorb and decompose organic matters in the wastewater, and converting COD (chemical oxygen demand) carbohydrates into CO2、 CH4、H2O, and reducing organic matter or hydrocarbons in the wastewater to sulfate using sulfate-reducing bacteria in anaerobic microorganisms and producing H under dissimilation2S, mixing the generated gas phases into methane, and reacting in the anaerobic reactor for a time: 15-6 h;
and step 3: introducing the part of the biogas generated in the step 2 into a precipitation reactor to perform precipitation reaction with the nickel wastewater introduced into the precipitation reactor, wherein the chemical reaction formula is as follows: NiCl2+H2The method comprises the following steps of (1) preparing nickel-containing wastewater, wherein the S is NiS +2HCl, the reaction time is 10-11 h at normal temperature and normal pressure, and the nickel wastewater is generated due to incomplete purification of a nickel catalyst in the process of preparing xylitol under the action of the nickel catalyst through xylose hydrogenation;
and the residual marsh gas is led into a marsh gas desulfurization device, and the H in the marsh gas is washed by alkaline washing liquid with the concentration of 1.5 to 4 percent in advance2S is separated out and H is separated out through a bioreactor2S is converted into sulfur and H is removed2And the marsh gas of the S is stored as energy.
And 4, step 4: filtering the NiS precipitate generated in the step (3) for temporary storage through a filtering device, and conveying the supernatant liquid of which the total nickel in the precipitation reactor reaches the standard into an adjusting tank, namely the total nickel marking supernatant liquid has the total nickel content not more than 1.0 mg/L;
and 5: introducing the wastewater treated in the step 2 into an aeration tank, and decomposing residual carbohydrate into CO through the oxidation of aerobic bacteria in the aeration tank2And H2O, realizing that the COD concentration in the wastewater is not more than 350 mg/L;
the concentration of dissolved oxygen in the aeration tank is 3-5mg/L, and the retention time of wastewater in the aeration tank is 34-36 h.
Further, the NiS crystals temporarily stored in the step 4 are conveyed to a unit with hazardous waste management and qualification for treatment.
Further, still include:
step 6: discharging the wastewater treated in the step 5 into a sedimentation tank, standing the wastewater in the sedimentation tank for 10-12 hours, and discharging supernatant in the sedimentation tank into a municipal treatment plant for advanced treatment;
and discharging the sludge settled at the bottom of the sedimentation tank into a sludge concentration tank, and conveying the concentrated sludge to a filter press for dehydration treatment.
Further, the sludge settled at the bottom of the sedimentation tank in the step 6 is pumped into the aeration tank in the step 5 to continue degrading COD in the wastewater with aerobic bacteria, the rest sludge is discharged into a sludge concentration tank, and the concentrated sludge is conveyed to a filter press for dehydration treatment.
Compared with the prior art, the device and the process for treating the wastewater in the xylitol processing process are distinctive in structure and convenient to operate, the wastewater generated in the xylitol production process in a workshop is introduced into the regulating tank, the pH value is regulated to 6.5-7.8 by adding corresponding hydrochloric acid or sodium hydroxide into the regulating tank according to the measured pH value, so that the pH value of the wastewater subsequently introduced into the anaerobic reactor cannot influence the microbial activity in the anaerobic reactor, and the organic matters in the wastewater are degraded by microbes, namely, the COD carbohydrate is converted into CO2、CH4、H2O, and organic matter or hydrocarbons are reduced to sulfate and are dissimilatedProduction of H under the action of2S, then CO is introduced2、CH4、H2O and H2S, mixing to form biogas, introducing the biogas into a precipitation reactor, carrying out precipitation reaction on the biogas and nickel wastewater introduced into the precipitation reactor in advance, precipitating NiS crystals, filtering the NiS crystals by using filtering equipment, and transferring the NiS crystals to a unit with hazardous waste management and qualification for treatment; and the wastewater after reaction in the precipitation reactor is introduced into the aeration tank, and the residual carbohydrate is decomposed by using aerobic bacteria in the aeration tank, so that the organic matters in the wastewater are thoroughly removed.
In addition, the remainder in the anaerobic reactor contains H2Introducing the marsh gas of the S into a marsh gas desulfurization device, and washing H in the marsh gas by alkaline washing liquid2S is separated out and H is separated out by a bioreactor2S is converted into sulfur.
The treatment process that this scheme was taken, fully consider the characteristics of high COD, high sulfate radical in the quality of water, adopt anaerobic technique and biological desulfurization technique, avoided traditional anaerobic process can't handle the defect of high sulfate radical, combine the waste water characteristics, the characteristics of having considered to treat waste with useless again, the heavy metal in nickeliferous waste water is fully got rid of to the waste gas that produces with the anaerobic system, guarantee that nickeliferous waste water safety discharge to reach standard and outer sewage discharge to reach standard, fully retrieve biological energy simultaneously, reduce the sewage station working costs.
The device can remove nickel, high sulfate radical and COD in the wastewater by combining a plurality of devices, and the traditional chemical method treats the nickel-containing wastewater, adds sodium hydroxide into the wastewater, precipitates nickel ions to form Ni (OH)2The heavy metal nickel in order to get rid of the waste water is precipitated, and the waste water PH value after handling is 10.5-11, and the later stage still need add sour anti-adjustment, so the treatment cost is higher, so compare traditional chemical method and handle nickel waste water and only handle COD etc. through the anaerobism technology and have high efficiency, low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a sewage treatment process flow chart of a wastewater treatment device in xylitol processing.
FIG. 2 is a structural connection diagram of a wastewater treatment device in xylitol processing.
In the figure: 1. the system comprises a regulating tank, 2, an anaerobic reactor, 3, a precipitation reactor, 4, filtering equipment, 5, a bioreactor, 6, a methane desulfurization device, 7, an aeration tank, 8, a sludge reflux pump, 9, a precipitation tank, 10, a sludge concentration tank, 11, a filter press and 12, and a water pump.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, a wastewater treatment apparatus in xylitol processing as a preferred embodiment of the present invention comprises:
the adjusting tank 1 is used for receiving the production wastewater and adjusting the pH value of the wastewater, namely, the wastewater with COD and high sulfate radicals generated in the xylitol production process is discharged into the adjusting tank 1, the pH value of the wastewater in the adjusting tank 1 is detected, and corresponding hydrogen chloride and sodium hydroxide are added according to the detection result so as to adjust and control the pH value of the wastewater to be in a proper range, namely 6.5-7.8;
an anaerobic reactor 2 for receiving the wastewater discharged from the regulating tank 1 and decomposing organic matters in the wastewater into CO2, CH4, H2O and H2S to form mixed biogas; specifically, a wastewater pump 12 with adjusted PH is fed into an anaerobic reactor 2, preferably, the anaerobic reactor 2 is an anaerobic fluidized bed reactor, the anaerobic fluidized bed reactor is a high-efficiency biofilm treatment method, which uses sand and other substances with large surface area as carriers, anaerobic microorganisms are bonded on the surface of the sand or other carriers in a membrane form, and the microorganisms contact with organic matters in the wastewater to adsorb and decompose the organic matters so as to achieve the purpose of treatment.
A precipitation reactor 3 connected with the anaerobic reactor 2 by pipes and used for receiving partial marsh gas and carrying out precipitation reaction on the marsh gas and nickel wastewater generated in the xylitol production process to generate NiS so as to remove H2S and nickel in the nickel wastewater, and the precipitation reactor 3 is connected with the regulating pool 1 through a water pump 12, namely the precipitation reactor 3 is connected with the anaerobic reactor 2 through a pump, and the generated biogas is pumped into the precipitation reactor 3; and the pump may be an exhaust fan.
A filtering device 4 for filtering the NiS generated in the precipitation reactor 3; namely, the NiS generated in the precipitation reactor 3 is fixed and filtered by a physical method so as to realize the removal of nickel in the wastewater.
A biogas desulfurization device 6 connected with the anaerobic reactor 2 for receiving the residual biogas to remove H in the biogas2S is removed, the generated hydrogen sulfide is introduced into a bioreactor 5 to be converted into sulfur which is sold as a byproduct, and H is removed2The marsh gas of the S can be stored to be used as energy; in particular, the bioreactor 5 is a conventional device and is well known to those skilled in the art and will not be described in detail herein.
An aeration tank 7 connected to the anaerobic reactor 2 for accommodating the wastewater treated in the anaerobic reactor 2 and decomposing the residual carbohydrate to produce CO by aerobic bacteria in the aeration tank 72And H2O；
The sedimentation tank 9 is connected with a water outlet pipe of the aeration tank 7, in the field, the sedimentation tank 9 is also generally called a secondary sedimentation tank and is used for storing the wastewater discharged by the aeration tank 7 and settling floating objects in the wastewater, and the sedimentation tank 9 is connected with a municipal sewage treatment plant through a pipe, and the subsequent control is carried out through the sewage treatment plant so that the wastewater at the drainage position reaches the standard. And the water outlet of the aeration tank 7 is positioned at the upper end so as to automatically flow into a municipal sewage treatment plant through the passage for subsequent advanced treatment after the aeration tank is full of water.
In the above embodiment, the system further comprises a sludge concentration tank 10 and a filter press 11, wherein the sludge concentration tank 10 is used for concentrating sludge formed by sedimentation of floating materials in the sedimentation tank 9, and discharging the concentrated sludge into the filter press 11 for dehydration treatment, and the dehydrated sludge is convenient for transportation, and the sludge can be used as a raw material for producing organic fertilizers and can also be sent to a landfill for landfill treatment, it is required to be noted that the sludge concentration tank 10 and the filter press 11 are both in the prior art, specific principles and installation are not described in detail, and in addition, sludge reflux pumps 9 are arranged between the sludge concentration tank and the sedimentation tank, and between the sludge concentration tank and the filter press.
It should be explained that the sludge from the sedimentation tank 9 enters the sludge concentration tank 10 and is further settled by standing, and the clear liquid on the upper layer of the sludge concentration tank 10 flows back to the aeration tank 7, so that the sludge in the tank is further concentrated.
Preferably, the sedimentation tank 9 is connected with the aeration tank 7 through a sludge reflux pump 8, and a part of sludge settled at the bottom of the sedimentation tank 9 is discharged into the aeration tank 7 through the sludge reflux pump 8, so that aerobic bacteria in the sludge are ensured to continue to degrade COD in the wastewater together with oxygen, the reuse of the aerobic bacteria is ensured, the subsequent addition of the aerobic bacteria in the aeration tank 7 is avoided, and the automatic replenishment is realized.
In particular, the filtering device 4 is a plate frame or a belt filter, and may be any device capable of implementing a filtering function, and is within the protection scope of the present application.
Specifically, the sedimentation tank 9 is a radial flow sedimentation tank 9, the sedimentation tank 9 is the radial flow sedimentation tank 9, the radial flow sedimentation tank 9 is an ideal matching device of the sedimentation tank 9 in the sewage treatment process by a semi-bridge peripheral transmission mud scraping activated sludge method, and the main function is to remove sludge precipitated in the sedimentation tank 9 and floaters on the surface layer of the water surface;
the aerobic sludge is settled to the bottom of the sedimentation tank 9 by gravity and is collected in a sludge hopper at the bottom of the sedimentation tank 9 by a sludge scraper.
Preferably, the aeration tank 7 is located above the sedimentation tank 9, so that the wastewater in the aeration tank 7 automatically flows into the sedimentation tank 9 along a pipeline, namely the wastewater flows into the sedimentation tank 9 under the action of gravity, a water suction pump 12 is omitted, and energy consumption is reduced.
In this embodiment, the regulating tank 1 and the anaerobic reactor 2, the settling reactor 3 and the regulating tank 1, the settling reactor 3 and the filtering equipment 4, and the anaerobic reactor 2 and the aeration tank 7 are connected by a water pump 12, that is, the above components are all used for conveying wastewater by the water pump 12 to perform wastewater treatment.
As shown in FIG. 1, a wastewater treatment process in xylitol processing, which is used in the wastewater treatment plant in xylitol processing described in any one of the above, comprises the steps of:
step 1: enabling the wastewater containing high COD and high sulfate radicals to pass through an adjusting tank 1, adding hydrochloric acid or sodium hydroxide into the adjusting tank 1 to adjust the pH value of the wastewater to be 6.5-7.8, so as to meet the water inlet requirement of the anaerobic reactor 2 and ensure the activity of anaerobic bacteria in the anaerobic reactor 2;
step 2: after the pH value of the wastewater is adjusted, pumping 12 the wastewater into an anaerobic reactor 2, wherein the temperature of the anaerobic reactor 2 is 30-37 ℃, the anaerobic reactor 2 is internally provided with a self-heating function to ensure that the temperature of the wastewater is 30-37 ℃, so that the anaerobic bacteria in the anaerobic reactor 2 keep activity, preferably, an electric heating wire is arranged in the anaerobic reactor 2, the heating is realized through the electric heating wire, carriers with anaerobic microorganisms in the anaerobic reactor 2 flow in the wastewater to adsorb and decompose organic matters in the wastewater, specifically, the carriers with anaerobic microorganisms are anaerobic sludge, and carbohydrates of COD are converted into CO2、CH4、 H2O, and reduction of organic matter or hydrocarbons to sulfate using sulfate-reducing bacteria in anaerobic microorganisms and production of H under dissimilation2S, the pH value adjusted in the step 1 is to ensure the activity of microorganisms in the wastewater and improve the treatment effect and quality, and the generated gas phases are mixed into methane; namely, the COD carbohydrate in the wastewater is converted into CO by the anaerobic reactor 22，CH4，H2And O, simultaneously, under the anaerobic condition, various organic matters or hydrocarbons are reduced to sulfate by using microbial sulfate reducing bacteria, and hydrogen sulfide is directly formed under the dissimilation action. The way in which sulfate-reducing bacteria reduce sulfate to hydrogen sulfide is also called microbial sulfate reduction, these gas phase components are biogas, and the reaction time in the anaerobic reactor is ensured: and (4) the full reaction is realized for 15-6 h, and the wastewater treatment quality is improved.
It should be explained that the anaerobic reactor 2 is an anaerobic fluidized bed reactor, which is a high-efficiency biofilm method treatment method, and the biofilm method purification gas can be divided into three steps:
dissolving: the waste gas contacts with the water film on the water surface, the pollutant is dissolved in the water, namely the malodorous substance is transferred from the gas phase to the liquid phase, and the step is the Henry's law of the physical process.
Adsorption and absorption: the offensive odor component in the aqueous solution is adsorbed and absorbed by the microorganism. Transferring from the water to the microorganism, the water used as absorbent is regenerated and recovered, and then new malodorous components are dissolved.
Biodegradation: the malodorous components entering the microbial cells are decomposed as energy or nutrients for the life activities of the microbes, and elemental sulfur is generated through the biological oxidation process, so that pollutants are removed.
The microbial sulfate reducing bacteria utilize various organic matters or hydrocarbons to reduce sulfate, and hydrogen sulfide is directly formed under the dissimilation action; during this action, sulfate-reducing bacteria incorporate only a small portion of the metabolized sulfur into the cells, and the majority of the sulfur is absorbed by aerobic organisms to complete the energy metabolism process. Organic matter decomposition products of some strains may become nutrients required to be absorbed by other strains, so that the absorption and conversion efficiency of organic matters by sulfate reducing bacteria is improved, and a large amount of hydrogen sulfide is generated. This way in which sulfate-reducing bacteria reduce sulfate to hydrogen sulfide is also known as microbial sulfate reduction (BSR). The process is the main action type of biochemical origin of hydrogen sulfide, and the dissimilatory reduction is performed in a strict anaerobic environment, so that the storage and aggregation of the generated hydrogen sulfide are facilitated, but the abundance of the formed hydrogen sulfide generally does not exceed 2%, and the formation medium condition is required to be suitable for the growth and propagation of sulfate reducing bacteria, so that the dissimilatory reduction cannot occur in the deep layer.
And step 3: introducing the part of the biogas generated in the step 2 into a precipitation reactor 3 to perform precipitation reaction with the nickel wastewater introduced into the precipitation reactor 3, wherein the chemical reaction formula is as follows: NiCl2+H2The method comprises the following steps of (1) preparing nickel-containing wastewater, wherein S is NiS +2HCl, the reaction condition is normal temperature and normal pressure, the reaction time is 10-11 hours, full reaction is realized, and the nickel wastewater is generated due to incomplete purification of a nickel catalyst in the process of preparing xylitol under the action of the nickel catalyst through xylose hydrogenation;
as all the waste water is used for the nickel-containing waste water, the waste water can be sent to participate in the reaction with the nickel-containing waste water, the redundant part after the reaction is sent to a biogas biological desulphurization device, the residual biogas is led into a biogas desulphurization device 6, and H in the biogas is washed by alkaline washing liquid in advance2S is separated out and H is passed through bioreactor 52S is converted into sulfur and H is removed2The marsh gas of S is stored as energy, part of high sulfate radicals in the wastewater are removed, and H passes through2And S, realizing separation.
And 4, step 4: filtering the NiS precipitate generated in the step 3 for temporary storage through a filtering device 4, and conveying the supernatant liquid of which the total nickel in the precipitation reactor 3 reaches the standard into an adjusting tank 1 to remove nickel and partial high sulfate radicals contained in the wastewater, wherein the content of the total nickel in the supernatant liquid of which the total nickel reaches the standard is not more than 1.0mg/L, and the concentration is set as the standard;
and 5: and (3) introducing the wastewater treated in the step (2) into an aeration tank (7) to decompose residual carbohydrates into CO2 and H2O through the oxidation action of aerobic bacteria in the aeration tank (7), so that the COD concentration in the wastewater is not more than 350mg/L, the removal of the carbonic acid compounds in the wastewater is ensured, the concentration of dissolved oxygen in the aeration tank (7) is maintained to be 3-5mg/L, the retention time of the wastewater in the aeration tank is 34-36H, the sufficient aerobic bacteria concentration is ensured, and the carbohydrates are decomposed by the aerobic bacteria under the action of sufficient oxygen.
In the above embodiment, the NiS crystals temporarily stored in step 4 are transported to a unit with hazardous waste management and qualification for treatment, so as to avoid secondary pollution.
In the above embodiment, the method further includes:
step 6: discharging the wastewater treated in the step 5 into a sedimentation tank 9, standing the wastewater in the sedimentation tank for 10-12 hours, and discharging supernatant in the sedimentation tank 9 into a municipal treatment plant for advanced treatment;
the sludge settled at the bottom of the sedimentation tank 9 is discharged into a sludge concentration tank 10, and the concentrated sludge is conveyed to a filter press 11 for dehydration treatment, so that the transportation is convenient, and the environmental pollution is avoided.
Specifically, the sludge settled at the bottom of the sedimentation tank 9 in the step 6 is pumped into the aeration tank 7 in the step 5 to continue degrading COD in the wastewater with aerobic bacteria, so that sample bacteria are automatically supplemented, namely the sludge in the aeration tank 7 enters the sedimentation tank 9 along with the wastewater, a part of the sludge flows back to the aeration tank 7 by using a sludge pump, and the other part of the sludge is discharged, so that the sludge in the aeration tank 7 is always in a balanced state; the excess sludge is discharged into the sludge thickener 10, and the thickened sludge is transferred to the filter press 11 for dewatering treatment.
In a word, when the wastewater treatment device in the xylitol processing provided by the invention is applied, the wastewater generated in the xylitol production process in a workshop is introduced into the regulating tank 1, the pH value is regulated to 6.5-7.8 by adding corresponding hydrochloric acid or sodium hydroxide into the regulating tank 1 according to the measured pH value, so that the pH value of the wastewater subsequently introduced into the anaerobic reactor 2 cannot influence the activity of microorganisms in the anaerobic reactor 2, and the organic matters in the wastewater are degraded by the microorganisms, namely, the COD carbohydrate is converted into CO2、 CH4、H2O, and organic matter or hydrocarbons are reduced to sulfate and H is produced under dissimilation2S, then CO is introduced2、 CH4、H2O and H2S is mixed to form biogas, the biogas is introduced into the precipitation reactor 3 and is subjected to precipitation reaction with nickel wastewater which is introduced into the precipitation reactor 3 in advance, NiS crystals are generated and precipitated, the NiS crystals are filtered out by the filtering equipment 4, andthe treatment is carried out by a unit with the operating qualification of the hazardous waste; and the wastewater after the reaction in the precipitation reactor 3 is introduced into the aeration tank 7, and the residual carbohydrate is decomposed by using aerobic bacteria in the aeration tank 7, so that the organic matters in the wastewater are thoroughly removed.
In addition, the remainder in the anaerobic reactor 2 contains H2The marsh gas of the S is introduced into a marsh gas desulfurization device 6, and H in the marsh gas is washed by alkaline washing liquid2S is separated out and H is separated out by using a bioreactor 52S is converted into sulfur.
Through the device, nickel, high sulfate radical and COD in the wastewater can be removed through the combination of a plurality of devices, and the nickel-containing wastewater is treated by the traditional chemical method, sodium hydroxide is added into the wastewater to precipitate nickel ions to form Ni (OH)2The heavy metal nickel in order to get rid of the waste water is precipitated, and the waste water PH value after handling is 10.5-11, and the later stage still need add sour anti-adjustment, so the treatment cost is higher, so compare traditional chemical method and handle nickel waste water and only handle COD etc. through the anaerobism technology and have high efficiency, low cost.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a effluent treatment plant in xylitol processing which characterized in that includes:
the adjusting tank (1) is used for receiving the production wastewater and adjusting the pH value to be 6.5-7.8;
an anaerobic reactor (2) for receiving the wastewater discharged from the regulating tank (1) and decomposing organic matters in the wastewater into CO by anaerobic microorganisms in the anaerobic reactor (2)2、CH4、H2O and H2S, forming mixed methane;
a precipitation reactor (3) which is connected with the anaerobic reactor (2) by a pipe and is used for receiving partial marsh gas and carrying out precipitation reaction on the marsh gas and nickel wastewater generated in the xylitol production process to generate NiS so as to remove H2S and nickel in the nickel wastewater, and the precipitation reactor is connected with a regulating reservoir pipe through a water pump;
a filtering device (4) for filtering the NiS produced in the precipitation reactor (3);
a biogas desulfurization device (6) connected with the anaerobic reactor (2) by pipes and used for receiving the residual biogas to remove H in the biogas2S is removed, and the removed H is2S is introduced into a bioreactor (5) to be converted into sulfur;
an aeration tank (7) connected with the anaerobic reactor (2) by a pipe to accommodate the wastewater treated in the anaerobic reactor (2) and decompose the residual carbohydrate to generate CO by aerobic bacteria in the aeration tank (7)2And H2O；
And the sedimentation tank (9) is connected with a water outlet pipe of the aeration tank (7) and is used for storing the wastewater discharged by the aeration tank (7) and settling the floating objects in the wastewater, and the sedimentation tank (9) is connected with a municipal sewage treatment plant pipe.
2. The xylitol processing wastewater treatment device according to claim 1, further comprising a sludge concentration tank (10) and a filter press (11), wherein the sludge concentration tank (10) is used for concentrating sludge formed by the sedimentation of floaters in the sedimentation tank (9) and discharging the concentrated sludge into the filter press (11) for dehydration treatment.
3. The xylitol processing wastewater treatment device according to claim 2, wherein the sedimentation tank (9) is connected with the aeration tank (7) through a sludge reflux pump (8).
4. The xylitol processing wastewater treatment plant according to claim 1, characterized in that the filtration equipment (4) is a plate-and-frame or belt filter.
5. The xylitol processing wastewater treatment plant according to claim 1, characterized in that the sedimentation tank (9) is a radial sedimentation tank.
6. The xylitol processing wastewater treatment device according to claim 1, wherein the regulating tank (1) and the anaerobic reactor (2), the precipitation reactor (3) and the regulating tank (1), the precipitation reactor (3) and the filtering equipment (4), and the anaerobic reactor (2) and the aeration tank (7) are connected by a water pump (12).
7. A xylitol in-process wastewater treatment process for use in the xylitol in-process wastewater treatment apparatus according to any one of claims 1 to 6, characterized by comprising the steps of:
step 1: enabling the wastewater containing high COD and high sulfate radicals to pass through a regulating tank (1), and adding hydrochloric acid or sodium hydroxide into the regulating tank (1) to regulate the pH value of the wastewater to be 6.5-7.8;
step 2: after the pH value of the wastewater is adjusted, pumping the wastewater into an anaerobic reactor (2), keeping the temperature in the anaerobic reactor (2) at 30-37 ℃, enabling carriers with anaerobic microorganisms in the anaerobic reactor (2) to flow in the wastewater to adsorb and decompose organic matters in the wastewater, and converting carbohydrates of COD (chemical oxygen demand) into CO2、CH4、H2O, and reducing organic matter or hydrocarbons in the wastewater to sulfate using sulfate-reducing bacteria in anaerobic microorganisms under anaerobic conditions and producing H under dissimilarity2S, mixing the generated gas phases to form biogas, wherein the reaction time of the wastewater in the anaerobic reactor is as follows: 15-6 h;
and step 3: introducing the part of the biogas generated in the step 2 into a precipitation reactor (3) to perform precipitation reaction with the nickel wastewater introduced into the precipitation reactor (3), wherein the chemical reaction formula is as follows:
NiCl2+H2the reaction time is 10-11 h under normal temperature and normal pressure;
the nickel wastewater is generated due to incomplete purification of the nickel catalyst in the process of preparing the xylitol under the action of the nickel catalyst by xylose hydrogenation;
and the residual marsh gas is led into a marsh gas desulfurization device (6) and is washed by alkaline washing liquid with the concentration of 1.5 to 4 percent in advance, and then H in the marsh gas is removed2S is separated out and H is separated out through a bioreactor (5)2S is converted into sulfur and H is removed2And the marsh gas of the S is stored as energy.
And 4, step 4: filtering out and temporarily storing the NiS precipitate generated in the step 3 through the filtering equipment (4), and conveying the supernatant reaching the standard of the total nickel in the precipitation reactor (3) into the regulating tank (1), namely the content of the total nickel in the total nickel marking supernatant is not more than 1.0 mg/L;
and 5: introducing the wastewater treated in the step 2 into an aeration tank (7), and decomposing residual carbohydrate into CO through the oxidation of aerobic bacteria in the aeration tank (7)2And H2O to achieve a COD concentration in the wastewater of no more than 350 mg/L;
the concentration of dissolved oxygen in the aeration tank is 3-5mg/L, and the retention time of wastewater in the aeration tank is 34-36 h.
8. The xylitol processing wastewater treatment process according to claim 7, wherein the NiS crystals temporarily stored in the step 4 are transported to a unit with hazardous waste management and qualification for treatment.
9. The xylitol processing wastewater treatment process according to claim 7, further comprising:
step 6: discharging the wastewater treated in the step 5 into a sedimentation tank (9), standing the wastewater in the sedimentation tank for 10-12 hours, and discharging the supernatant in the sedimentation tank (9) into a municipal treatment plant for advanced treatment;
and discharging the sludge settled at the bottom of the sedimentation tank (9) into a sludge concentration tank (10), and conveying the concentrated sludge to a filter press (11) for dehydration treatment.
10. The xylitol processing wastewater treatment process according to the claim 9, characterized in that the sludge settled at the bottom of the sedimentation tank (9) in the step 6 is partially pumped into the aeration tank (7) in the step 5 to continue degrading COD in the wastewater with aerobic bacteria, the rest sludge is discharged into the sludge concentration tank (10), and the concentrated sludge is conveyed to the filter press (11) for dehydration treatment.
CN201911122807.1A 2019-11-16 2019-11-16 Wastewater treatment device and process in xylitol processing Pending CN112811710A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114751599A (en) * 2022-05-09 2022-07-15 陕西建工第十二建设集团有限公司 Pyrite leachate and domestic sewage co-treatment device and method
CN115677027A (en) * 2022-11-16 2023-02-03 江苏南大华兴环保科技股份公司 Comprehensive treatment system and method for high-concentration sulfate organic wastewater and process waste gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114751599A (en) * 2022-05-09 2022-07-15 陕西建工第十二建设集团有限公司 Pyrite leachate and domestic sewage co-treatment device and method
CN115677027A (en) * 2022-11-16 2023-02-03 江苏南大华兴环保科技股份公司 Comprehensive treatment system and method for high-concentration sulfate organic wastewater and process waste gas
CN115677027B (en) * 2022-11-16 2023-10-13 江苏南大华兴环保科技股份公司 Comprehensive treatment system and method for high-concentration sulfate organic wastewater and process waste gas

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