CN100369835C - Treatment process for making sewage as recirculating cooling water - Google Patents
Treatment process for making sewage as recirculating cooling water Download PDFInfo
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- CN100369835C CN100369835C CNB2005100128523A CN200510012852A CN100369835C CN 100369835 C CN100369835 C CN 100369835C CN B2005100128523 A CNB2005100128523 A CN B2005100128523A CN 200510012852 A CN200510012852 A CN 200510012852A CN 100369835 C CN100369835 C CN 100369835C
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- 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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The present invention relates to treating technology for reusing sewage as circulating cooling water, which belongs to the technical field of sewage treatment. The treating technology is characterized in that immobilized microbial treatment is carried out to pretreated outlet water, strong degradation of exclusive high-efficiency strains through manual sieving and strengthening is used to make the COD and the NH4-N of the outlet water reach satisfied water quality indexes, and after advanced treatment, the standard or the requirement for reusing sewerage as circulating cooling water is satisfied. The present invention has the advantages that the treating technology overcomes defects in the prior art, has less sludge generating quantity, omits two settling tanks, saves the fund of capital construction by 20% to 30% and saves ground occupation. The prevent invention also has the advantages of stable running, convenient management, short treatment delay time, high oxygen utilization rate and running cost saving. Devices have simple structure and low cost, and can be reformed conveniently on the basis of old technology or can be connected for treatment after the prior art, and the biological activity can not be influenced when the devices do not run for a period of time. The treating technology is particularly suitable for operation in maintaining periods or the operation of intermittent production.
Description
Technical field
The invention belongs to technical field of sewage specifically is microbial method.
Background technology
Petrochemical enterprise belongs to the water rich and influential family, annual all have a large amount of sewage discharges in environment, and both contaminate environment caused the tremendous economic waste and the wasting of resources to enterprise again, along with the strictness of national requirements for environmental protection, these waters rich and influential family is faced with the difficult problem of factory effluent reuse.At present, the sewage work of domestic petroleum chemical industry has substantially all adopted the old three cover technologies of " oil removal+air supporting+A/O " method that the seventies begins to use, only can reach " integrated wastewater discharge standard " secondary standard, but impacted easily in the activated sludge process operational process of old three cover technologies, influence treatment effect, on-the-spot smell is bigger, and needs to cultivate again after out of service in the maintenance stage again, brings a lot of inconvenience to production management.And along with the adjustment of oil refining industry technology; emerging technological process and raw-material adjustment cause the composition in the sewage to change to some extent, add the reinforcement of national environmental protection policy; and protect the reality of water resources to need, original technical process obviously can not meet the demands.To will be back to industrial circulating cooling water after the production wastewater treatment, also will look after the influence of processing cost, make enterprise in the protection water resources, also can be to self bringing corresponding interests.Because oil refining sewerage oleaginousness height, phenyl ring, many lopps composition are more, and hardly degraded organic substance contains a large amount of ammonia nitrogens, organonitrogen etc. again than great, so bring great difficulty to the advanced treatment of sewage.Though reverse osmosis at present and other sewage treatment process also can reach the effluent quality that reuse requires, but running cost is too high, enterprise can't bear, and causes a large amount of oil-refining chemical waste water reuses economically.
Summary of the invention
The purpose of this invention is to provide a kind of reusing sewage in circulation cooling process technology, not only can make sewage satisfy the requirement or the standard of recirculated cooling water reuse, and processing cost is low, device is simple, and operation, maintenance are convenient, of many uses.Especially be adapted to the advanced treatment of trade effluents such as refinery water, power-plant waste, steel mill's waste water and sanitary sewage.
Main technical schemes of the present invention is: a kind of reusing sewage is in the recirculated cooling water treatment process, comprise pre-treatment and advanced treatment, it is characterized in that treatment based on immobilized microorganisms is carried out in pretreated water outlet, the powerful Degradation of the exclusive high-efficiency strain by artificial screening, reinforcement makes water outlet COD, NH
4-N meets the requirements of water-quality guideline, thereby reaches standard or the requirement of reusing sewage in recirculated cooling water through advanced treatment again, and advanced treatment comprises that biological activated carbon is handled and filter sterilization is handled.
Treatment based on immobilized microorganisms is to use anaerobic biofilter and BAF, and adopts water inlet upper water-out filter tank technique down, and order was interchangeable before and after anaerobic biological treatment and aeration and biological were handled two operations; Drop into efficient flora in the biological filter, these microorganism species are easy to be immobilized on the carrier through cultivating instructionization, generally do not need to replenish, effectively hardly degraded organic substances such as the aromatic hydrocarbons in the degradation of sewage, phenol, naphthalene; Block on adopting in this biological filter, the immobilization carrier of blocking down, according to the Inlet and outlet water index request decision process combination mode and the residence time.
The biological filter can be following structure: be provided with upper and lower block in the filter tank, between upper and lower block carrier be housed, be provided with aeration tube below the following block, gas blower air feed, the whole water inlet upper water-out down that adopts.
High-effective microorganism can adopt the B series microbial strains of U.S. BL company.
Carrier can adopt modification, can with bacterial classification with covalent linkage form bonded polyamine fat foam material or biological ceramic particle filler.
Can being provided with up and down in the biological activated carbon pond, two-layer block is used for support and interception gac.
The above-mentioned multilevel processing technology that adopts, anaerobic biofilter or BAF can be plural serial stage or many groups are in parallel.
Detailed base reason of the present invention is as follows:
Add efficient flora in the biological filter, these microorganisms are easy to be immobilized on the carrier through cultivating domestication, lose with current unlike activated sludge process, therefore generally do not need to replenish.The selected microorganism of this technology is efficient special microorganism and compound enzymic preparation, this product is to adopt reinforcement and the modification of engineered means to natural microorganisms, microbic activity and adaptability have been improved, effectively hardly degraded organic substances such as the aromatic hydrocarbons in the degradation of sewage, phenol, naphthalene.
The difficult degradation toxic organic compound that contains in the trade effluent often accumulates in environment easily, causes the harm to the ecosystem, have in addition can be carcinogenic, abnormal, the system mutagenicity of system.The bio-immobilized technology that grows up now has biological concentration height, good treatment efficiency, stable, advantage such as solid-liquid separation is simple.Immobilized microorganism is used for the improvement of hardly degraded organic substance, can also select artificially and keeps high-efficiency strain, after immobilization, the ability to bear and the degradation capability of toxic substance is all obviously improved, and strengthens shock-resistance.
The square fritter shape of the most handy 1.5-2mm of carrier polyamine fat foam material processes, the big (80m of this carrier specific surface area
2/ g), porosity height (98%).Simultaneously, by molecular designing, introduce a large amount of activity and strong polar group and pass through immobilization technology in carrier, will make a variation in a large number bacterium and zymin firmly are fixed on the carrier, and the unit volume biomass is big, reaches as high as 60g/L.The average wet density of carrier can be 1.00g/cm
3,, proportion and water are approaching in the pond, are in suspended state, are filled in block centre up and down, and this carrier is used in combination the dissolved oxygen content that can fully improve device with microporous aeration device, be up to 30%, reduces the working cost of gas blower to a great extent.Anaerobic pond can be all the same with the Aerobic Pond layout, and single pond holds best about 100 cubic metres, can connect and use also and can in parallelly use, and forms some levels, organizes common degradation of contaminant.Anaerobism and aerobic link can transform mutually, and whether decision opens aeration according to the water quality regulation situation, and the size of tolerance.
The fixation support pair cell plays a protective role, and fixation support can produce inhibition to the diffusion of organic pollutant, and the actual Pollutant levels of cell surface are reduced, and toxicity reduces; Cell has been set up certain physical chemistry contact between carrier and cell after immobilization, increased cell membrane stability; The residing microenvironment of immobilized cell is different with free cell, and the variation of this microenvironment can cause the change of morphological structure, physiological property and the metabolic activity of cell.
Hardly degraded organic substance is relative, is not to degrade, and the biodegradation process of hardly degraded organic substance is very complicated, relates to all many-sides such as action of microorganisms, Effect of Environmental.When touching hardly degraded organic substance, selecting under the effect of pressing, the population of microorganism can change gradually, can utilize this organic microbe population to increase, and finally become dominant bacteria, causes the biological degradation of hardly degraded organic substance.
Anaerobic biofilter utilizes hydrolysis, fermentation, the acidification of anaerobion, reduces COD in a large number, improves the B/C value of sewage, realizes deoxidation by denitrifying bacteria, also can reduce the cost of sewage disposal; The water outlet of anaerobic biofilter enters BAF and carries out aerobic treatment, makes organism change carbonic acid gas and water into by aerobic bacteria, and ammonia nitrogen changes nitrate radical and nitrite anions into.
The anaerobic biofilter water outlet enters BAF and carries out biochemical reaction, further reduces ammonia nitrogen content.Because adopt immobilization technology, the microorganism difficult drop-off had so both improved biological concentration, had avoided obstruction again, can save second pond, simplified technical process greatly, made the easier and science of operational administrative, be easy to control.The main effect of BAF is by ammonia nitrogen and organism in the aerobic microbiological reduction sewage.Guarantee effluent index reach substantially " reuse of wastewater engineering design standard " (GB50335-2002) reuse water as industrial circulating cooling water make up water standard.Can select the anaerobic and aerobic link flexibly according to the water quality situation treatment stage of whole biological filter.The combination of the treatment process of the best of finally determining, the whole residence time is at about 15 to 20 hours, according to water quality difference difference to some extent.
Outstanding advantage of the present invention is: not only can make sewage satisfy the requirement or the standard of recirculated cooling water reuse, and processing cost is low, device is simple, and operation and maintenance are convenient, of many uses.
This sewage treatment process can be handled the refinery water of petroleum chemical industry to the standard that is back to industrial circulating cooling water, and not need second pond, and the mud generation is few, and effluent index satisfies; COD≤60mg/L, ammonia nitrogen≤10mg/L, even can reach ammonia nitrogen≤1mg/L.Stable, convenient management, the reaction times is short, and shock-resistance is strong.This technology is highly suitable for the processing of trade effluents such as power-plant waste, steel mill's waste water, the advanced treatment that is particularly useful for petrochemical complex class waste water, to process water rich and influential family's production, sanitary wastewater advanced treatment to recirculated cooling water, effect with highly significant also is applicable to the improvement of rivers and lakes environmental wastewater.
This technology is compared with the existing old three cover technologies of petrochemical industry, and following advantage is arranged:
1, residence time weak point 25%, treatment effect can accomplish that reclaimed water reuse is in the industrial circulating cooling water standard from the integrated wastewater discharge standard secondary.
Whether 2, operational management is convenient, does not need sludge treatment, adjusts reflux ratio etc., only need timing detection device to break down after debugging is finished.
3, do not have second pond, the biological tank residence time is short, saves capital construction fund 20-30%, saves the land seizure area.
4, coefficient of oxygen utilization height is saved working cost.
5, adopt immobilized microorganism technique, for some time out of service, can not influence biological activity, can resume operation about one week as long as recover aeration.
6, device construction is simple, and is convenient, is convenient to transform on old technology basis, perhaps is connected existing technology and handles afterwards.
Be described further below in conjunction with example and accompanying drawing, but not as a limitation of the invention.
Description of drawings
Fig. 1 is that refinery water of the present invention is back to recirculated cooling water processing technological flow figure.
Fig. 2 is an immobilized microorganism filter tank system schematic flow sheet.
Fig. 3 is the biological filter sectional structure chart.
Fig. 4 is that embodiment 1 urban sewage recycling is in recirculated cooling water processing technological flow figure.
Fig. 5 is embodiment 2 oil refining sewerage reuse project example flow chart.
Embodiment
Referring to Fig. 1, treatment process is: sewage → equalizing tank → float → scavenger → immobilized microorganism filter tank → biological activated carbon filter → filter sterilization → water outlet every the pond.
Referring to Fig. 2, treatment process is: give processing → immobilized microorganism filter tank level Four processing → biological activated carbon filter, the blast aeration setting is all arranged.
Referring to Fig. 3,1 is water-in, and 2 is the pond body, and 3 is aeration tube, and 4 for blocking down, and 5 is carrier, and 6 is last block, and 7 is water outlet.
Referring to Fig. 4, treatment process is: water inlet → pump well → settling pond (medicament) → biological filter → biological activated carbon → middle pond (sterilization, sterilization) → circulating water system, and the biological activated carbon back flushing, pond water outlet in the employing, mud refluxes.
Referring to Fig. 5, treatment process is: water inlet → equalizing tank → oil removal flotation cell (medicament) → biological filter → biological activated carbon pond → filter sterilization sterilization → circulating water system, and the biological activated carbon back flushing, mud refluxes.
Embodiment 1: town sewage is back to the power cycle water coolant.Certain 30000m
3/ d reusing sewage engineering.Water inlet COD≤150mg/L, BOD≤60mg/L, SS≤60mg/L, NH
4 +-N≤35mg/L; " reuse of wastewater engineering design standard " carried out in water outlet, and (GB50335-2002) reuse water is as the additional water quality standard of recirculated cooling water, and its water quality standard is: COD≤60mg/L, ammonia nitrogen≤10mg/L according to manufacturer's material, requires to accomplish ammonia nitrogen≤1mg/L.
The biological filter comprises immobilization anaerobic biofilter and BAF, and the residence time is 4 hours altogether, divides eight groups of Pyatyi series-parallel connection operations, and unit cells is held 5 * 5 * 5.5m.Use carrier 2500m
3, the B350 of U.S. BL company, B500 microorganism 2500Kg.The biological activated carbon residence time is 2 hours, and water outlet meets the requirements of index.
Embodiment 2: be used for oil refining sewerage reuse project example:
Certain sewage from oil refinery treatment project:
The water yield: 720m
3/ d
Biological filter water inlet index: COD:400-1000mg/L, ammonia nitrogen: 20-200mg/L effluent index: water outlet execution " reuse of wastewater engineering design standard " (GB50335-2002) reuse water replenishes water quality standard as recirculated cooling water, its water quality standard is: COD≤60mg/L, ammonia nitrogen≤10mg/L.
Waste water enters the biological filter after the oil removal flotation, be divided into level Four, and one, three, level Four is the immobilized microorganism BAF, secondary is the immobilized microorganism anaerobic biofilter, altogether 12 hours residence time, uses carrier 160m
3The B350 of U.S. BL company, B110 microorganism 160Kg.Biological activated carbon stopped 3 hours, but filter, after the sterilization water outlet direct reuse in recirculating cooling water system.
Claims (7)
1. a reusing sewage is in the recirculated cooling water treatment process, comprise pre-treatment and advanced treatment, it is characterized in that treatment based on immobilized microorganisms is carried out in pretreated water outlet, this treatment based on immobilized microorganisms is to use anaerobic biofilter and BAF, and adopting water inlet upper water-out filter tank technique down, order can be exchanged before and after anaerobic biological treatment and aeration and biological were handled two operations; In the biological filter, drop into efficient flora by artificial screening, reinforcement, be B series B350, B110, the B500 microbial strains of U.S. BL company, this microorganism species is easy to be immobilized on the carrier through cultivating domestication, generally do not need to replenish, effectively the aromatic hydrocarbons in the degradation of sewage, phenol, naphthalene hardly degraded organic substance make water outlet COD, NH
4-N reaches the water-quality guideline of recirculated cooling water requirement, and this biological filter is adopted and gone up block, block fixes carrier down, according to the index request decision process combination and the residence time; Thereby reach standard or the requirement of reusing sewage in recirculated cooling water through advanced treatment again, advanced treatment comprises that biological activated carbon is handled and filter sterilization is handled.
2. reusing sewage according to claim 1 is characterized in that in the recirculated cooling water treatment process described reusing sewage is ammonia nitrogen≤1mg/L, COD≤60mg/L in the standard of recirculated cooling water or the water-quality guideline of requirement.
3. reusing sewage according to claim 1 is in the recirculated cooling water treatment process, it is characterized in that described biological filter is following structure: be provided with upper and lower block in the filter tank, between upper and lower block carrier is housed, be provided with aeration tube below the following block, the gas blower air feed, the whole water inlet upper water-out down that adopts.
4. reusing sewage according to claim 1 is in the recirculated cooling water treatment process, it is characterized in that described immobilization carrier adopt modification, can with bacterial classification with covalent linkage form bonded polyamine fat foam material or biological ceramic particle filler.
5. reusing sewage according to claim 1 is characterized in that being provided with upper and lower two-layer block and is used for support and interception gac in the recirculated cooling water treatment process in the biological activated carbon pond.
6. reusing sewage according to claim 1 is characterized in that in the recirculated cooling water treatment process pre-treatment comprises adjusting, and oil removal, flotation precipitate or establish pump well, is one or more combination wherein.
According to claim 1,2,3,4,5 or 6 described reusing sewages in the recirculated cooling water treatment process, it is characterized in that adopting the multi-stage biological treatment process, anaerobic biofilter or BAF are that plural serial stage or many groups are in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100128523A CN100369835C (en) | 2005-09-27 | 2005-09-27 | Treatment process for making sewage as recirculating cooling water |
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| CNB2005100128523A CN100369835C (en) | 2005-09-27 | 2005-09-27 | Treatment process for making sewage as recirculating cooling water |
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| CN100369835C true CN100369835C (en) | 2008-02-20 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102153247B (en) * | 2011-05-06 | 2015-06-10 | 梁锦雄 | Biological coupled nitrogen and phosphorus removed sewage purification and regeneration treatment method and system |
| CN103102004A (en) * | 2011-11-10 | 2013-05-15 | 中国石油化工股份有限公司 | Industrial circulation water treatment method |
| CN105314789A (en) * | 2014-06-09 | 2016-02-10 | 蒋寿悟 | Treatment process of recycling sewage for circulating cooling water |
| CN105543157B (en) * | 2016-01-29 | 2018-08-24 | 宁波景骐置业发展有限公司 | A kind of screening of microorganism species for gardens purification of water quality and acclimation method |
| CN111392986A (en) * | 2020-04-24 | 2020-07-10 | 华能国际电力股份有限公司 | Thermal power plant wastewater advanced treatment system and method based on quasi-IV-class surface water standard |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030226805A1 (en) * | 2002-06-06 | 2003-12-11 | Industrial Technology Research Institute | Method of wastewater treatment with biological active carbon using recycled oxygen-enriched water and apparatus used therein |
| CN1524810A (en) * | 2003-02-28 | 2004-09-01 | 杭玉君 | Method for cyclically utilizing middle water of public toilet sewage and specialized equipment therefor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030226805A1 (en) * | 2002-06-06 | 2003-12-11 | Industrial Technology Research Institute | Method of wastewater treatment with biological active carbon using recycled oxygen-enriched water and apparatus used therein |
| CN1524810A (en) * | 2003-02-28 | 2004-09-01 | 杭玉君 | Method for cyclically utilizing middle water of public toilet sewage and specialized equipment therefor |
Non-Patent Citations (1)
| Title |
|---|
| 生物活性炭技术及在污水处理中的应用. 兰淑澄.城市给排水，第28卷第1期. 2002 * |
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