CN105692962B - A kind of method of biogas slurry treatment and recycling - Google Patents

A kind of method of biogas slurry treatment and recycling Download PDF

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Publication number
CN105692962B
CN105692962B CN201610144300.6A CN201610144300A CN105692962B CN 105692962 B CN105692962 B CN 105692962B CN 201610144300 A CN201610144300 A CN 201610144300A CN 105692962 B CN105692962 B CN 105692962B
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biogas slurry
raw material
organic fertilizer
fertilizer raw
generated
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CN105692962A (en
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朱建林
王金辉
黄怡然
涂凌波
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Ningbo University
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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
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F9/00—Fertilisers from household or town refuse
    • C05F9/04—Biological compost
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
    • C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
    • C12P5/023—Methane
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Abstract

The invention discloses a kind of biogas slurry treatment and the method for recycling, feature is to comprise the following steps：（1）Biogas slurry is subjected to secondary anaerobic digestion, biogas residue makees solid organic fertilizer raw material；（2）The water outlet that secondary anaerobism is generated carries out flocculation sediment processing, and the sludge of generation makees solid organic fertilizer raw material；（3）The water outlet that flocculation sediment is generated carries out refined filtration processing, and the back-flushing of generation is sent back to mixed flocculation sediment process and is handled again；（4）The water outlet that refined filtration process is generated carries out hyperfiltration treatment using hyperfiltration membrane assembly, and the concentrated water that ultra-filtration process is generated is as Liquid organic fertilizer raw material；（5）The clear water that ultra-filtration process generates is subjected to reverse-osmosis treated using reverse osmosis membrane assembly, the concentrated water that reverse osmosis process is generated is as Liquid organic fertilizer raw material, the clear water that reverse osmosis process generates directly is discharged or recycled, advantage is to realize that the concentration of nutriment low cost utilizes and realizes biogas slurry qualified discharge in biogas slurry.

Description

A kind of method of biogas slurry treatment and recycling
Technical field
The present invention relates to field of environment protection, more particularly, to a kind of biogas slurry treatment and the method for recycling.
Background technology
Biogas slurry is the by-product that organic matter anaerobic digestion process generates, and is given birth to rich in nutrients such as nitrogen, phosphorus, potassium and to plant Long hair gives birth to the trace element of benefit, therefore biogas slurry has been widely used in as organic fertilizer in agriculture and forestry.Different biogas engineerings The content of nutriment has larger difference in generated biogas slurry.Under normal conditions, the COD in biogas slurry（CODcr）、 Ammonia nitrogen（NH4 +）, total phosphorus (TP) is respectively up to 8000-12000mg/L, 2000-4000 mg/L, 30-150 mg/L.However, due to Agriculture and forestry production season is very strong, and the requirement of fertilizer also has strong seasonality, and biogas slurry amount caused by biogas engineering is too It greatly and is difficult to dispense, has larger difference between the yield of biogas slurry and the seasonal needs of agricultural and forestry production, cause substantial amounts of biogas slurry It is hopeless, many biogas engineerings a large amount of biogas slurries of generation can only be hoarded in low lying areas such as the pond on periphery, ditch ports or Arbitrarily it is thrown among surrounding enviroment.Since the nutrient concentrations in biogas slurry are very high, hoarding or arbitrarily discharging can all feed water Environment causes seriously to pollute.Therefore, biogas slurry processing and using be limitation the large and medium-sized biogas engineering wide popularization and application in China Bottleneck factor.
Processing to biogas slurry both at home and abroad and using substantial amounts of study and form numerous technology and methods.Biogas slurry The conventional method of processing is the nutrients removed using the methods of chemistry, biology in biogas slurry, to scheme rear discharge up to standard.Such method Most energy consumption is big, of high cost, it is difficult to reach discharge standard, and the nutrients in biogas slurry cannot efficiently use.Especially for The biogas slurry of some classifications（Such as the anaerobism biogas slurry of kitchen garbage and its waste water）, because of the suspended matter containing high concentration（SS）, protein Class, colloid pollutant, the cost higher of processing up to standard.Therefore, biogas slurry is subjected to concentration and extracted therein effective Composition is as fertilizer, it has also become solves a large amount of biogas slurry pollution problems and realizes the basic ideas of recycling.CN 101712565 A propose a kind of " biogas slurry turns organic fertilizer production scheme and preparation method ", and basic skills is to carry out biogas slurry Biogas slurry concentration is realized using reverse osmosis technology after sand filtration.But pollutant concentration is usually very high in biogas slurry, this method only by the use of sand filtration as The required influent quality requirement of reverse osmosis unit is not achieved in reverse osmosis pretreatment, easily cause very serious fouling membrane and It blocks and quickly film will be caused to be scrapped.104058799 A of CN propose " a kind of biogas slurry concentrate and engineering preparation method ", Basic procedure be biogas slurry carry out after acidification hydrolization, refined filtration, ultrafiltration, the pretreatments such as nanofiltration it is reverse osmosis.But for containing height The SS of concentration and the kitchen garbage anaerobism biogas slurry of colloid pollutant, using this method be still difficult to preferably to solve it is reverse osmosis before it is pre- Process problem.102603369 A of CN are proposed a kind of " biogas slurry fertilizer technique ", and basic working procedure is anaerobic fermentation, air supporting, nothing Machine ceramic membrane separation, using the liquid obtained after separation as foliar fertilizer crude product.This method mainly uses inorganic ceramic UF membrane work Skill, a great number of elements such as nitrogen, phosphorus, potassium and trace element enter in separating obtained clear liquid, still can not actually solve biogas slurry Thickening problem.
The content of the invention
The technical problems to be solved by the invention, which are to provide, a kind of can realize in biogas slurry that nutriment low cost concentration utilizes And realize the biogas slurry treatment of biogas slurry qualified discharge and the method for recycling.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of side of biogas slurry treatment and recycling Method comprises the following steps：
（1）Biogas slurry is subjected to secondary anaerobic digestion and generates biogas, while using the sludge that secondary anaerobic processes generate as solid Body organic fertilizer raw material；Its main purpose is that the COD of high concentration remaining in biogas slurry is further converted to biogas, and it is dense to reduce COD Degree；Simultaneously by anaerobic effect, the organic nitrogen in biogas slurry is further converted to NH4 +, improve NH4 +Concentration；
（2）The water outlet that secondary anaerobism is generated carries out flocculation sediment processing, using the sludge that flocculation sediment process generates as Solid organic fertilizer raw material；It acts on and mainly removes solid content remaining in secondary anaerobism biogas slurry, and it is dense further to reduce COD Degree, provides good service condition for subsequent refined filtration and ultra-filtration process, avoids or mitigate blocking；
（3）The water outlet that flocculation sediment is generated carries out refined filtration processing, and the back-flushing that refined filtration process generates is sent back to flocculation Precipitation process is handled again；It, which is acted on, mainly further removes solid content remaining in biogas slurry, avoids or mitigates subsequent ultrafiltration Film blocks；
（4）The water outlet that refined filtration process is generated carries out hyperfiltration treatment using hyperfiltration membrane assembly, ultra-filtration process is generated dense Water is as Liquid organic fertilizer raw material；Its effect is to retain>0.002-0.1 microns of colloid, protein, microorganism and big point Sub- organic matter, and small-molecule substance and dissolubility salt is allowed to pass through；
（5）The clear water that ultra-filtration process generates is subjected to reverse-osmosis treated using reverse osmosis membrane assembly, reverse osmosis process is produced Raw concentrated water is directly discharged or recycled as Liquid organic fertilizer raw material, the clear water of generation.Its act on be retain it is small Molecular substance and dissolubility salt, i.e., contained ammonia nitrogen, phosphorus, potassium etc. in biogas slurry.
Step（1）Described in secondary anaerobism used by reactor for up flow anaerobic sludge blanket reactor or expansion Grain sludge bed reactor or full-mixing type reactor, hydraulic detention time are 5-20 days.
Step（2）The flocculant used during flocculation sediment is in ferrous sulfate, bodied ferric sulfate and polyaluminium sulfate At least one, the flocculant usage 100-200mg/L.
Step（3）The filter medium that refined filtration process uses is quartz sand, activated carbon, diatomite or fiber filtering.
Step（4）The hyperfiltration membrane assembly that ultra-filtration process uses is tubular ultrafiltration membrane module, the tubular ultrafiltration membrane module Filter sizes for 0.002-0.1 microns, operating pressure 0.1-0.6Mpa.
Compared with prior art, the advantage of the invention is that：First, rational technology, it is stable, it is of low cost；2nd, concentrate Biogas slurry volume afterwards can reduce by more than 70%, and condition is created for the storage of biogas slurry, transport and utilization；3rd, the sludge and dense generated Contracting biogas slurry can be respectively as the raw material of solid-state and Liquid organic fertilizer；4th, treated, and biogas slurry clear liquid can reuse or qualified discharge.
Description of the drawings
Fig. 1 is the process flow chart of biogas slurry treatment of the present invention and the method for recycling.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing embodiment.
Specific embodiment
Waste water obtained by the pretreatment procedures such as kitchen waste drainage, sorting, broken, slurrying, three phase separation, using full-mixing type Anaerobic reactor (CSTR) carries out Anaerobic Digestion, and 25 days residence times, the correlation water index of generated biogas slurry is：Change Learn oxygen demand（CODcr）11000mg/L, ammonia nitrogen（NH4 +）2600 mg/L, 150 mg/L of total phosphorus (TP), suspended matter（SS）7000 mg/L.It is handled and resource utilization method, as shown in Figure 1, comprising the following steps：
（1）Former biogas slurry is subjected to secondary anaerobic digestion.Reactor used is upflow anaerobic sludge blanket process（UASB）, waterpower stops It is 15 days to stay time HRT.Its COD removal rate 50%, water outlet COD 5500mg/L, NH4 + 2800 mg/L、SS 3000mg/L；Hold Product factor of created gase still reaches 0.6m3/m3.d；
（2）Secondary anaerobic effluent is subjected to coagulating sedimentation.Using bodied ferric sulfate+polyacrylamide（PAM）As coagulation Agent, after reacted, precipitation, the raw material of the sludge of generation as solid fertilizer；Its water outlet COD 900mg/L, SS 200mg/L；
（3）Coagulating sedimentation water outlet is subjected to refined filtration.Using D fiber types filter tank, can retain>5 microns of particle.Refined filtration mistake The back-flushing that journey generates returns to flocculation sediment process and handles again；
（4）Refined filtration water outlet is subjected to ultrafiltration.Using tubular ultrafiltration membrane module, the concentrated water which generates is as concentrated liquid Organic fertilizer raw material, volume is about the 1/5 of former biogas slurry volume, and contained ammonia nitrogen, phosphorus etc. then enter in clear water in biogas slurry；
（5）Ultra-filtration water is carried out reverse osmosis.Using anti-pollution reverse osmosis membrane assembly, to retain small-molecule substance and molten Solution property salt, i.e., contained ammonia nitrogen, phosphorus, potassium etc. in biogas slurry, the concentrated water of process generation as concentrated liquid organic fertilizer raw material, and Clear water can qualified discharge or as Treated sewage reusing.
In addition to the implementation, reactor can also be expanded granular sludge bed used by secondary anaerobism（EGSB）It is or complete Mixing reactor, hydraulic detention time are 5-20 days；The flocculant used during flocculation sediment is also for ferrous sulfate, polymerised sulphur At least one of sour iron and polyaluminium sulfate, flocculant usage 100-200mg/L；The filter medium that refined filtration process uses is also Can be quartz sand, activated carbon, diatomite or fiber filtering.The filter sizes of tubular ultrafiltration membrane module are 0.002-0.1 microns, Operating pressure is 0.1-0.6Mpa.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above.The art Those of ordinary skill is in the essential scope of the present invention, the variations, modifications, additions or substitutions made, should also belong to the present invention's Protection domain.

Claims (3)

1. a kind of method of biogas slurry treatment and recycling, it is characterised in that comprise the following steps：
(1) biogas slurry is subjected to secondary anaerobic digestion and generates biogas, while using biogas residue as solid organic fertilizer raw material；
(2) water outlet for generating secondary anaerobism carries out flocculation sediment processing, and the sludge that flocculation sediment process is generated is as solid Organic fertilizer raw material, wherein the flocculant used is compound as coagulant, the flocculant for bodied ferric sulfate and polyacrylamide Dosage 100-200mg/L；
(3) water outlet for generating flocculation sediment carries out refined filtration processing, and the back-flushing that refined filtration process generates is sent back to flocculation sediment Process is handled again；
(4) water outlet for generating refined filtration process carries out hyperfiltration treatment using hyperfiltration membrane assembly, and the concentrated water that ultra-filtration process is generated is made For Liquid organic fertilizer raw material, wherein the hyperfiltration membrane assembly used is tubular ultrafiltration membrane module, the tubular ultrafiltration membrane module Filter sizes are 0.002-0.1 microns, operating pressure 0.1-0.6Mpa；
(5) clear water that ultra-filtration process generates is subjected to reverse-osmosis treated using reverse osmosis membrane assembly, reverse osmosis process is generated The clear water that reverse osmosis process generates directly is discharged or recycled as Liquid organic fertilizer raw material by concentrated water.
2. the method for a kind of biogas slurry treatment according to claim 1 and recycling, it is characterised in that：In step (1) Used by the secondary anaerobism reactor for up flow anaerobic sludge blanket reactor or Expanded Granular Sludge Bed Reactor or Full-mixing type reactor, hydraulic detention time are 5-20 days.
3. the method for a kind of biogas slurry treatment according to claim 1 and recycling, it is characterised in that：Step (3) essence The filter medium for filtering Cheng Caiyong is quartz sand, activated carbon, diatomite or fiber filtering.
CN201610144300.6A 2016-03-14 2016-03-14 A kind of method of biogas slurry treatment and recycling Active CN105692962B (en)

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Cited By (1)

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CN108586064A (en) * 2018-06-27 2018-09-28 安徽瑞然生物药肥科技有限公司 It is a kind of using biogas residue as the crops medicine of raw material fertilizer and preparation method

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CN106336253A (en) * 2016-08-16 2017-01-18 宁夏顺宝现代农业股份有限公司 Production process for producing organic fertilizer through concentrating biogas slurry by using multistage membrane separation technology
CN106365369A (en) * 2016-08-30 2017-02-01 天津市农业资源与环境研究所 Biogas slurry concentration and nutrient enrichment system for large biogas project and application method thereof
CN106477675A (en) * 2016-10-26 2017-03-08 浙江省农业科学院 Biogas slurry advanced treatment process
CN106630282A (en) * 2016-12-26 2017-05-10 航天凯天环保科技股份有限公司 Method for treating biogas slurry in USR (up-flow solid reactor) methane tank
CN107311702A (en) * 2017-08-09 2017-11-03 上海田应农业科技有限公司 A kind of method that livestock and poultry farm fecaluria biogas slurry integrated treatment recovery prepares Liquid Fertilizer
CN107434314A (en) * 2017-08-25 2017-12-05 江苏苏港和顺生物科技有限公司 A kind of biogas slurry concentrates engineering equipment
CN109264933A (en) * 2018-11-16 2019-01-25 北京天地人环保科技有限公司 A kind of processing equipment for incineration plant landfill leachate
CN109569082B (en) * 2018-12-11 2021-02-09 广东巴斯德环境科技有限公司 Method for treating culture biogas slurry
CN109607870A (en) * 2019-01-02 2019-04-12 上海环境工程设计研究院有限公司 A kind of biogas slurry recycling treatment process
CN111072424B (en) * 2019-12-24 2021-08-20 东华大学 Slow-release carbon-based small molecular fertilizer and preparation method thereof
CN111362544A (en) * 2020-04-02 2020-07-03 中国农业大学 Method for producing liquid organic fertilizer and clean reuse water of farm from biogas slurry
CN112830651A (en) * 2020-12-22 2021-05-25 国网江西省电力有限公司电力科学研究院 Water source heat pump-methane power generation cogeneration circulation method and system

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