CN110697992A - Method for treating pepper peeling processing wastewater - Google Patents

Method for treating pepper peeling processing wastewater Download PDF

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Publication number
CN110697992A
CN110697992A CN201911046501.2A CN201911046501A CN110697992A CN 110697992 A CN110697992 A CN 110697992A CN 201911046501 A CN201911046501 A CN 201911046501A CN 110697992 A CN110697992 A CN 110697992A
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treatment
mbr
pump
reaction
treatment liquid
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王兵
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Yunnan Ning Mao Environmental Science And Technology Co Ltd
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Yunnan Ning Mao Environmental Science And Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D19/00Degasification of liquids
    • B01D19/02Foam dispersion or prevention
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D3/00Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14Fractional distillation or use of a fractionation or rectification column
    • B01D3/26Fractionating columns in which vapour and liquid flow past each other, or in which the fluid is sprayed into the vapour, or in which a two-phase mixture is passed in one direction
    • B01D3/28Fractionating columns with surface contact and vertical guides, e.g. film action
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281Installations for water purification using chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/722Oxidation by peroxides
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/32Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/08Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/14NH3-N
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/16Total nitrogen (tkN-N)
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/02Odour removal or prevention of malodour
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/02Specific form of oxidant
    • C02F2305/026Fenton's reagent
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/12Activated sludge processes
    • C02F3/1236Particular type of activated sludge installations
    • C02F3/1268Membrane bioreactor systems

Abstract

The invention discloses a method for treating pepper peeling processing wastewater, which relates to the technical field of sewage treatment and comprises the following steps: s1, collecting waste water; s2, coarse screening; s3, cooling, adjusting and deodorizing; s4, settling and deslagging; s5, performing primary biological anoxic reaction and primary MBR treatment; s6, Fenton reaction; s7, secondary biological anoxic reaction and secondary MBR treatment; and S8, nanofiltration treatment. The invention has the beneficial effects that: (1) MBR treatment and Fenton reaction are combined, so that the method disclosed by the invention is quick to start, high in organic matter and total nitrogen removal rate and capable of effectively decoloring; (2) the Nanofiltration (NF) is adopted as a stable guarantee measure of the method disclosed by the invention, and the majority of organic matters, TN and TP, can be removed by the NF device and simultaneously decoloration is finished due to the fluctuation of the effluent quality in the debugging or starting process. The NF concentrated water returns to the Fenton reaction unit, so that the influence of high-concentration salts on the primary MBR can be reduced.

Description

Method for treating pepper peeling processing wastewater
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating pepper peeling processing wastewater.
Background
Pepper is an important tropical spicy crop, peeling is a key process for producing white pepper, a large amount of sewage is generated no matter a traditional peeling method, a water retting method, a microbial fermentation method, a freezing mechanical peeling method and other new methods are adopted, and the sewage treatment is a difficult problem of peeling the Hainan pepper.
At present, no research report is found on the aspects of the quality characteristics of pepper peeling sewage, sewage treatment methods, regeneration and reuse feasibility and the like in China. The lack of sewage quality data makes the sewage treatment scheme uncertain, leads to that the sewage discharge exceeds standard in the pepper peeling production process, or design sewage treatment method does not have data reference, and the pepper produces the sewage total amount big in the peeling process, and organic matter content is high, how effectively handle pepper processing sewage, is the new subject that the Hainan pepper processing industry awaits solution urgently. The waste water has the following characteristics: (1) the production cycle is short, and the cycle for starting the wastewater treatment system is short; (2) the organic matter content and suspended matter content of the waste water are particularly high, and a small amount of organic matters which are difficult to degrade are contained. (3) The total nitrogen and total phosphorus content of the wastewater is high. Therefore, the treatment process of the wastewater needs to solve the following problems: (1) the starting process of the wastewater treatment process is fast, and the requirement of stabilizing the effluent quality can be quickly met; (2) a large amount of suspended matters can be effectively removed; (3) the method can effectively remove the organic matters in the wastewater and can effectively remove the total nitrogen and the total phosphorus in the wastewater.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for treating pepper peeling processing wastewater, which comprises the following steps:
s1, collecting waste water: the pepper peeling wastewater flows into a collecting tank, is mixed and keeps the water quality stable;
s2, coarse screening: enabling the pepper peeling wastewater to flow through a lifting pump and a solid-liquid separator for solid-liquid separation to obtain a treatment solution A;
s3, cooling, adjusting and deodorizing: the treatment liquid A enters an adjusting tank, and aeration cooling and deodorization are carried out on the treatment liquid A to obtain treatment liquid B;
s4, settling and deslagging: allowing the treatment liquid B to flow into a sedimentation tank, adding a flocculating agent and an auxiliary agent for sedimentation reaction, and removing slag to form sludge and treatment liquid C;
s5, primary MBR treatment and primary anoxic reaction: the treatment liquid C is subjected to temperature regulation and control firstly, then subjected to MBR treatment, ultrafiltration, bubble separation, defoaming, aeration and denitrification reaction, and the sludge concentration is adjusted to obtain treatment liquid D;
s6, Fenton reaction: the treatment solution D is subjected to Fenton reaction by regulating the pH value and controlling the reduction potential, bubble separation is carried out, and iron ions are removed to obtain a treatment solution E;
s7, secondary MBR treatment and secondary biological anoxic reaction: performing MBR treatment on the treatment liquid E, performing ultrafiltration, aeration and denitrification reaction, and adjusting the sludge concentration to obtain a treatment liquid F;
s8, nanofiltration treatment: and (4) allowing the treated liquid F to enter a nanofiltration system, regulating and controlling the end pressure and transmembrane pressure difference of concentrated water, performing nanofiltration treatment, and refluxing the concentrated water to the step S6 for Fenton reaction to obtain standard-reaching discharged water.
The method comprises the following steps:
(1) the lifting pump in the S2 is a diaphragm pump or a thick slurry pump, a solid-liquid separator is adopted for solid-liquid separation, the solid-liquid separator is made of 304 stainless steel, and a front-section water collecting tank has a mixing function, so that the influence of water quality fluctuation caused by production change on solid-liquid separation is reduced;
(2) s3, because high-temperature curing is adopted in the pepper peeling process, the temperature of the generated wastewater is about 55 ℃, odor in a regulating tank needs to be removed by a ventilation and deodorization system, and meanwhile, cold air enters the upper part of the regulating tank and is ventilated and cooled for a retention time of about one day, so that the treatment liquid A is ventilated and cooled to 35-37 ℃;
(3) in the S4, the waste water is coagulated by a flocculating agent and an auxiliary agent for sedimentation and deslagging, and because the content of suspended matters is extremely high, a spiral sludge concentration and dehydration integrated machine is adopted for continuous deslagging and separation, the removal rate of the dehydrator on the suspended matters can reach more than 99 percent, and the suspended matters in the effluent are less than 100 mg/L.
(4) The first-stage biological anoxic reaction in the S5 plays a role of a biological selector and denitrification, can effectively control the growth of foaming flora, reduces biological foams generated by the first-stage MBR in the reaction process, and can remove nitrite and nitrate in the reflux liquid; the primary MBR is provided with a hollow fiber membrane, a suction pump, an aeration device and a reflux pump, the upper part of the primary MBR is provided with a foam separation device and a defoaming facility, and in addition, a heat exchanger is arranged in summer to keep the water temperature stable within 35 ℃ during the primary MBR treatment; by means of the process of separating microbe thallus and waste water in aerobic condition with hollow fiber membrane, 99% of soluble organic matter and 100% of microbe thallus, particle and partial colloid may be eliminated; the primary MBR has higher organic load and is the main process for removing organic matters, total nitrogen and total phosphorus in the method; the suction pump is switched on for 13min and switched off for 2 min; the reflux ratio of the reflux pump is 500-1000%; the sludge concentration in the S5 is 8000 mg/L;
(5) in the Fenton reaction in S6, hydrogen peroxide under an acidic condition generates a large amount of hydroxyl free radicals-OH with extremely high oxidizability under the catalytic action of ferrous ions, and organic matters which are difficult to degrade are oxidized by the hydroxyl free radicals, so that the pH value needs to be regulated to be 3.5-4.0, and the oxidation-reduction potential is 350mV-400 mV. About 60% -70% of organic matters can be removed in the Fenton reaction process, and the biodegradability of the Fenton reaction process is greatly improved. Meanwhile, the chroma of the waste water can be reduced. The Fenton reaction zone must be protected from corrosion and air agitated.
(6) S7, arranging a hollow fiber membrane, a suction pump, an aeration device and a reflux pump in the secondary MBR, wherein the reflux pump is arranged at the tail end of the secondary MBR, and the reflux ratio is 200-500%; the secondary MBR has lower organic load and mainly plays a role in refining the effluent. After the primary MBR treatment, the COD of the wastewater can be as low as 110-200mg/L, the total nitrogen can be as low as 15-20mg/L, and the total phosphorus can be 0.3-0.8 mg/L. (ii) a The sludge concentration in S7 was controlled to 3000 mg/L.
(7) The nanofiltration system in S8 is connected with the outlet of the ultrafiltration membrane, and the front end of the nanofiltration system is provided with a security filter, a high-pressure pump and a circulating pump; the pressure of the concentrated water end in S8 is 1.0-1.2MPa, and the transmembrane pressure difference is 0.6-0.7 MPa.
The invention has the beneficial effects that: (1) MBR treatment and Fenton reaction are combined, so that the method disclosed by the invention is quick to start, and has high organic matter and total nitrogen removal rate; the residual refractory organics after the MBR treatment are removed by Fenton reaction, and simultaneously the total phosphorus in the wastewater can be removed, and the biodegradability of the residual organics is effectively improved, so that the COD and NH of the wastewater3the-H, TN and TP can completely meet the effluent quality standard and can be effectively decolorized; (2) the Nanofiltration (NF) is adopted as a stable guarantee measure of the method disclosed by the invention, and the majority of organic matters, TN and TP, can be removed by the NF device and simultaneously decoloration is finished due to the fluctuation of the effluent quality in the debugging or starting process. The NF concentrated water returns to the Fenton reaction unit, so that the influence of high-concentration salts on the primary MBR can be reduced.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
A method for treating pepper peeling processing wastewater comprises the following steps: s1, collecting waste water: the pepper peeling wastewater flows into a collecting tank, is mixed and keeps the water quality stable; s2, coarse screening: enabling the pepper peeling wastewater to flow through a lifting pump and a solid-liquid separator for solid-liquid separation to obtain a treatment solution A; s3, cooling, adjusting and deodorizing: the treatment liquid A enters an adjusting tank, and aeration cooling and deodorization are carried out on the treatment liquid A to obtain treatment liquid B; s4, settling and deslagging: allowing the treatment liquid B to flow into a sedimentation tank, adding a flocculating agent and an auxiliary agent for sedimentation reaction, and removing slag to form sludge and treatment liquid C; s5, primary MBR treatment and primary anoxic reaction: the treatment liquid C is subjected to temperature regulation and control firstly, then subjected to MBR treatment, ultrafiltration, bubble separation, defoaming, aeration and denitrification reaction, and the sludge concentration is adjusted to obtain treatment liquid D; s6, Fenton reaction: the treatment solution D is subjected to Fenton reaction by regulating the pH value and controlling the reduction potential, bubble separation is carried out, and iron ions are removed to obtain a treatment solution E; s7, secondary MBR treatment and secondary biological anoxic reaction: performing MBR treatment on the treatment liquid E, performing ultrafiltration, aeration and denitrification reaction, and adjusting the sludge concentration to obtain a treatment liquid F; s8, nanofiltration treatment: and (4) allowing the treated liquid F to enter a nanofiltration system, regulating and controlling the end pressure and transmembrane pressure difference of concentrated water, performing nanofiltration treatment, and refluxing the concentrated water to the step S6 for Fenton reaction to obtain standard-reaching discharged water.
And in the S2, the lifting pump is a diaphragm pump or a underflow pump.
And in S3, the temperature of the treatment solution A is reduced to 35 ℃ in an aeration way, and the temperature reduction time is 1 day.
And a spiral-stacked sludge concentration and dehydration integrated machine is adopted for deslagging in S4.
In the S5, the temperature regulation and control adopts a heat exchanger to regulate and control the temperature of the treatment liquid C to be 35 ℃, a hollow fiber membrane, a suction pump, an aeration device and a reflux pump are arranged in the primary MBR, and a foam separation device and a defoaming facility are arranged at the upper part of the primary MBR; the suction pump is switched on for 13min and switched off for 2 min; the reflux ratio of the reflux pump is 500 percent; the sludge concentration in S5 is 8000 mg/L.
In S6, the pH value is regulated to 3.5, and the oxidation-reduction potential is 350 mV.
S7, arranging a hollow fiber membrane, a suction pump, an aeration device and a reflux pump in the secondary MBR, wherein the reflux pump is arranged at the tail end of the secondary MBR, and the reflux ratio is 200%; the sludge concentration in S7 was controlled to 3000 mg/L.
The nanofiltration system in S8 is connected with the outlet of the ultrafiltration membrane, and the front end of the nanofiltration system is provided with a security filter, a high-pressure pump and a circulating pump; in S8, the pressure of the concentrated water end is 1.0MPa, and the transmembrane pressure difference is 0.6 MPa.
Example 2
A method for treating pepper peeling processing wastewater comprises the following steps: s1, collecting waste water: the pepper peeling wastewater flows into a collecting tank, is mixed and keeps the water quality stable; s2, coarse screening: enabling the pepper peeling wastewater to flow through a lifting pump and a solid-liquid separator for solid-liquid separation to obtain a treatment solution A; s3, cooling, adjusting and deodorizing: the treatment liquid A enters an adjusting tank, and aeration cooling and deodorization are carried out on the treatment liquid A to obtain treatment liquid B; s4, settling and deslagging: allowing the treatment liquid B to flow into a sedimentation tank, adding a flocculating agent and an auxiliary agent for sedimentation reaction, and removing slag to form sludge and treatment liquid C; s5, primary MBR treatment and primary anoxic reaction: the treatment liquid C is subjected to temperature regulation and control firstly, then subjected to MBR treatment, ultrafiltration, bubble separation, defoaming, aeration and denitrification reaction, and the sludge concentration is adjusted to obtain treatment liquid D; s6, Fenton reaction: the treatment solution D is subjected to Fenton reaction by regulating the pH value and controlling the reduction potential, bubble separation is carried out, and iron ions are removed to obtain a treatment solution E; s7, secondary MBR treatment and secondary biological anoxic reaction: performing MBR treatment on the treatment liquid E, performing ultrafiltration, aeration and denitrification reaction, and adjusting the sludge concentration to obtain a treatment liquid F; s8, nanofiltration treatment: and (4) allowing the treated liquid F to enter a nanofiltration system, regulating and controlling the end pressure and transmembrane pressure difference of concentrated water, performing nanofiltration treatment, and refluxing the concentrated water to the step S6 for Fenton reaction to obtain standard-reaching discharged water.
And in the S2, the lifting pump is a diaphragm pump or a underflow pump.
And in S3, the temperature of the treatment solution A is reduced to 35 ℃ in an aeration way, and the temperature reduction time is 1 day.
And a spiral-stacked sludge concentration and dehydration integrated machine is adopted for deslagging in S4.
In the S5, the temperature regulation and control adopts a heat exchanger to regulate and control the temperature of the treatment liquid C to be 36 ℃, a hollow fiber membrane, a suction pump, an aeration device and a reflux pump are arranged in the primary MBR, and a foam separation device and a defoaming facility are arranged at the upper part of the primary MBR; the suction pump is switched on for 13min and switched off for 2 min; the reflux ratio of the reflux pump is 750 percent; the sludge concentration in S5 is 8000 mg/L.
In S6, the pH value is regulated to 3.7, and the oxidation-reduction potential is 375 mV.
S7, arranging a hollow fiber membrane, a suction pump, an aeration device and a reflux pump in the secondary MBR, wherein the reflux pump is arranged at the tail end of the secondary MBR, and the reflux ratio is 350%; the sludge concentration in S7 was controlled to 3000 mg/L.
The nanofiltration system in S8 is connected with the outlet of the ultrafiltration membrane, and the front end of the nanofiltration system is provided with a security filter, a high-pressure pump and a circulating pump; in S8, the pressure of the concentrated water end is 1.1MPa, and the transmembrane pressure difference is 0.65 MPa.
Example 3
A method for treating pepper peeling processing wastewater comprises the following steps: s1, collecting waste water: the pepper peeling wastewater flows into a collecting tank, is mixed and keeps the water quality stable; s2, coarse screening: enabling the pepper peeling wastewater to flow through a lifting pump and a solid-liquid separator for solid-liquid separation to obtain a treatment solution A; s3, cooling, adjusting and deodorizing: the treatment liquid A enters an adjusting tank, and aeration cooling and deodorization are carried out on the treatment liquid A to obtain treatment liquid B; s4, settling and deslagging: allowing the treatment liquid B to flow into a sedimentation tank, adding a flocculating agent and an auxiliary agent for sedimentation reaction, and removing slag to form sludge and treatment liquid C; s5, primary MBR treatment and primary anoxic reaction: the treatment liquid C is subjected to temperature regulation and control firstly, then subjected to MBR treatment, ultrafiltration, bubble separation, defoaming, aeration and denitrification reaction, and the sludge concentration is adjusted to obtain treatment liquid D; s6, Fenton reaction: the treatment solution D is subjected to Fenton reaction by regulating the pH value and controlling the reduction potential, bubble separation is carried out, and iron ions are removed to obtain a treatment solution E; s7, secondary MBR treatment and secondary biological anoxic reaction: performing MBR treatment on the treatment liquid E, performing ultrafiltration, aeration and denitrification reaction, and adjusting the sludge concentration to obtain a treatment liquid F; s8, nanofiltration treatment: and (4) allowing the treated liquid F to enter a nanofiltration system, regulating and controlling the end pressure and transmembrane pressure difference of concentrated water, performing nanofiltration treatment, and refluxing the concentrated water to the step S6 for Fenton reaction to obtain standard-reaching discharged water.
And in the S2, the lifting pump is a diaphragm pump or a underflow pump.
And in S3, the temperature of the treatment solution A is reduced to 35 ℃ in an aeration way, and the temperature reduction time is 1 day.
And a spiral-stacked sludge concentration and dehydration integrated machine is adopted for deslagging in S4.
In the S5, the temperature regulation and control adopts a heat exchanger to regulate and control the temperature of the treatment solution C to be 37 ℃, a hollow fiber membrane, a suction pump, an aeration device and a reflux pump are arranged in the primary MBR, and a foam separation device and a defoaming facility are arranged at the upper part of the primary MBR; the suction pump is switched on for 13min and switched off for 2 min; the reflux ratio of the reflux pump is 1000%; the sludge concentration in S5 is 8000 mg/L.
In S6, the pH value is regulated to 4.0, and the oxidation-reduction potential is at 400 mV.
S7, arranging a hollow fiber membrane, a suction pump, an aeration device and a reflux pump in the secondary MBR, wherein the reflux pump is arranged at the tail end of the secondary MBR, and the reflux ratio is 500%; the sludge concentration in S7 was controlled to 3000 mg/L.
The nanofiltration system in S8 is connected with the outlet of the ultrafiltration membrane, and the front end of the nanofiltration system is provided with a security filter, a high-pressure pump and a circulating pump; in S8, the pressure of the concentrated water end is 1.2MPa, and the transmembrane pressure difference is 0.7 MPa.
Test example 1
COD、BOD5、NH3-N, TN and TP detection
Detection standard: GB18918-2002 discharge Standard of pollutants for municipal wastewater treatment plant
The COD discharge concentration of the pepper peeling processing wastewater is limited to 50mg/L and BOD5Limiting the emission concentration to 10mg/L, NH3N emission concentration is limited to 5mg/L, TN emission concentration is limited to 15mg/L,the TP emission concentration was limited to 0.5 mg/L.
The experimental method comprises the following steps: the method of examples 1-3 was used to treat pepper peeling wastewater, and COD and BOD were measured before and after treatment5、NH3N, TN and TP concentration.
Removal rate (%) (pre-treatment concentration-post-treatment concentration)/pre-treatment concentration 100%
TABLE 1 detection results before and after treatment of pepper peeling process wastewater
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (8)

1. A method for treating pepper peeling processing wastewater is characterized by comprising the following steps: the method comprises the following steps: s1, collecting waste water: the pepper peeling wastewater flows into a collecting tank, is mixed and keeps the water quality stable; s2, coarse screening: enabling the pepper peeling wastewater to flow through a lifting pump and a solid-liquid separator for solid-liquid separation to obtain a treatment solution A; s3, cooling, adjusting and deodorizing: the treatment liquid A enters an adjusting tank, and aeration cooling and deodorization are carried out on the treatment liquid A to obtain treatment liquid B; s4, settling and deslagging: allowing the treatment liquid B to flow into a sedimentation tank, adding a flocculating agent and an auxiliary agent for sedimentation reaction, and removing slag to form sludge and treatment liquid C; s5, primary anoxic reaction and primary MBR treatment: the treatment liquid C is subjected to temperature regulation and control firstly, then subjected to MBR treatment, ultrafiltration, bubble separation, defoaming, aeration and denitrification reaction, and the sludge concentration is adjusted to obtain treatment liquid D; s6, Fenton reaction: the treatment solution D is subjected to Fenton reaction by regulating the pH value and controlling the reduction potential, and is subjected to bubble separation to remove iron ions to obtain a treatment solution E; s7, secondary biological anoxic reaction and secondary MBR treatment: performing MBR treatment on the treatment liquid E, performing ultrafiltration, aeration and denitrification reaction, and adjusting the sludge concentration to obtain a treatment liquid F; s8, nanofiltration treatment: and (4) allowing the treated liquid F to enter a nanofiltration system, regulating and controlling the end pressure and transmembrane pressure difference of concentrated water, performing nanofiltration treatment, and refluxing the concentrated water to the step S6 for Fenton reaction to obtain standard-reaching discharged water.
2. The method of claim 1, wherein: and in the S2, the lifting pump is a diaphragm pump or a underflow pump.
3. The method of claim 1, wherein: and in S3, the temperature of the treatment solution A is lowered to 35-37 ℃ in an aeration way for 1 day.
4. The method of claim 1, wherein: and a spiral-stacked sludge concentration and dehydration integrated machine is adopted for deslagging in S4.
5. The method of claim 1, wherein: in the S5, the temperature of the treatment liquid C is regulated and controlled by a heat exchanger to be less than or equal to 35 ℃, a hollow fiber membrane, a suction pump, an aeration device and a reflux pump are arranged in the primary MBR, and a foam separation device and a defoaming facility are arranged at the upper part of the primary MBR; the suction pump is switched on for 13min and switched off for 2 min; the reflux ratio of the reflux pump is 500-1000%; the sludge concentration in S5 is 8000 mg/L.
6. The method of claim 1, wherein: in S6, the pH value is regulated to 3.5-4.0, and the oxidation-reduction potential is 350mV-400 mV.
7. The method of claim 1, wherein: s7, arranging a hollow fiber membrane, a suction pump, an aeration device and a reflux pump in the secondary MBR, wherein the reflux pump is arranged at the tail end of the secondary MBR, and the reflux ratio is 200-500%; the sludge concentration in S7 was controlled to 3000 mg/L.
8. The method of claim 1, wherein: the nanofiltration system in S8 is connected with the outlet of the ultrafiltration membrane, and the front end of the nanofiltration system is provided with a security filter, a high-pressure pump and a circulating pump; the pressure of the concentrated water end in S8 is 1.0-1.2MPa, and the transmembrane pressure difference is 0.6-0.7 MPa.
CN201911046501.2A 2019-10-30 2019-10-30 Method for treating pepper peeling processing wastewater Pending CN110697992A (en)

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CN108083552A (en) * 2017-06-02 2018-05-29 苏州苏净环保工程有限公司 A kind of processing method of textile waste
CN108623102A (en) * 2018-07-03 2018-10-09 江西齐联环保科技有限公司 A kind of combined type SBR-MBR-Fenton Pig raising wastewater processing methods
CN109626714A (en) * 2018-12-06 2019-04-16 江苏维尔利环保科技股份有限公司 The film filtration concentrated processing method of landfill leachate nanofiltration concentrate second level minimizing
CN110357350A (en) * 2019-07-02 2019-10-22 广州鹏凯环境科技股份有限公司 A kind for the treatment of process for landfill leachate

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102503046A (en) * 2011-11-18 2012-06-20 北京伊普国际水务有限公司 Advanced treatment system and method for high-concentration percolate in comprehensive garbage disposal plant
CN103663849A (en) * 2012-09-13 2014-03-26 天津森诺过滤技术有限公司 Method for treating papermaking wastewater based on combined process including integrated membrane technology and advanced oxidation technology
CN108083552A (en) * 2017-06-02 2018-05-29 苏州苏净环保工程有限公司 A kind of processing method of textile waste
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