CN1994937A

CN1994937A - Air float-oxygen-enriched organism processing and reusing method for hotel sewage

Info

Publication number: CN1994937A
Application number: CN 200610129855
Authority: CN
Inventors: 肖羽堂
Original assignee: Nankai University
Current assignee: Nankai University
Priority date: 2006-12-05
Filing date: 2006-12-05
Publication date: 2007-07-11
Anticipated expiration: 2026-12-05
Also published as: CN1994937B

Abstract

The invention discloses a hotel effluent processing and recycling technique in the effluent processing domain, which comprises the following flow paths: effluent; adjusting pond; anaerobic hydrolytic pond; floatation pond; oxygen-enriched biological contact oxidizing pond; activated charcoal filter; ClO2 sterilizing pond; recycling water. The invention stabilizes system operation, which makes recycling water superior to living service water.

Description

Air float-oxygen-enriched biological treatment of a kind of hotel sewage and reuse method

Affiliated technical field

The present invention relates to a kind of hotel sewage and handle and reuse method, specifically relate to the bio-contact oxidation technical finesse hotel sewage recycling method of the elastic filler micro-pore aeration of a kind of coagulation air-float and oxygen-enriched aeration

Background technology

Wastewater from hotel water quality can be different because of the difference of gathering system, can comprise that generally kitchen draining, toilet and washing draining, large-scale hotel also have boiler house draining, laundry drains and parking lot draining, therefore in the wastewater from hotel composition, pending pollutant load such as suspended substance, washing composition, oil, nitrogen, phosphorus can be higher.

Handle at present that hotel's waste water mainly adopts technology and equipment comprise: barrier, oil trap, equalizing tank, coagulation, filtration, catalytic oxidation, blodisc, membrane bioreactor etc.

From the present situation of present China, contact oxidation method is commonplace.The characteristics of this method are that coefficient of oxygen utilization is higher, and management and maintenance is convenient, and operating noise is very little, but power consumption is bigger, and dynamic efficiency is low, and the microbial film that comes off easily is crashed to pieces, the light weight come-up.When selecting contact oxidation technology for use, volumetric loading should not be too big; The treatment effect of oil trap can directly influence generate subsequent metallization processes effect, should be in time naughty clearly; The DO that guarantees contact-oxidation pool is more than 2mg/L, but when DO surpasses 4mg/L, because excessive aeration rate can cause biofilm detachment, treatment effect descends on the contrary, therefore the DO optimum concn is probably about 3mg/L, and adopt intermittent aeration (as every aeration 4h, then 0.5h aeration again) at interval can effectively suppress algae grows; Behind contact-oxidation pool, add the come-up that biofilm detachment mud all can effectively be alleviated even suppress to flocculation agent, suitable mud backflow or regularly timely spoil disposal before the settling tank.

A ²O technology is anaerobic-anoxic-aerobic synchronous denitrogen dephosphorus technology, but with traditional A ²O technology is compared, in hotel's wastewater treatment, for the effective biological inoculum of enrichment, often in activated sludge tank, also to add filler, the high-performance bio micro-electrolysis stuffing (iron filings) that also in anaerobic pond, loads, to the hydrolysis of anaerobic reaction, acidifying, product acetate, produce the stage such as methane good strengthening effect all arranged, simultaneously micro-electrolysis reaction also can take place himself, the nascent state active substance of generation is (as H ⁺And Fe ²⁺) can with the many component generation redoxomorphismes in the water, and the pH value changed played good shock absorption, created good condition for anaerobic reaction, promoted the granulating of anaerobion, strengthened the capacity of resisting impact load of technology.In addition, the surface-area of biological micro-electrolysis stuffing is bigger, and anaerobion loss attached to it and difficult makes the microbial biomass that has kept higher in the anaerobic pond, has guaranteed the efficient of anaerobic treatment and subsequent technique.

MBR (membrane bioreactor) can in the space of compactness, realize simultaneously microorganism to the degraded of pollution substance and ultra-filtration membrane to the separating of pollution substance, and degraded with separate between exist synergy, be a kind of efficient, practical sewage disposal technology.Contain big gauging and surfactant in the wastewater from hotel, the crown_interception of micro-filtration or ultra-filtration membrane can be trapped in the emulsification shape hydrocarbon compound of these biodegradability differences in the reactor fully among the MBR.The effect of damming of film simultaneously also can improve microorganism concn in the reactor, prolong sludge retention time, help the breeding of long microorganism (as nitrifier and nitrococcus) growth from generation to generation, both improved degradation rate, and can also guarantee that nitration reaction is smooth and removed ammonia nitrogen effectively these hydrocarbon compounds.Membrane bioreactor generally adopts film immersion tubular fibre, membrane pore size is at 0.1～0.4 μ m, constant flow filtering, it is generally lower to cross film pressure, at 2～4KPa, by the unlatching situation of PLC regulating and controlling pond and reaction tank turnover water pump, reactor goes out the water outlet of water pump intermittent suction, adopt the water outlet continuous aeration simultaneously, the method rice of the empty aeration of termination of pumping delays the increase of resistance of membrane filtration.

Adopt physical chemistry method to handle hotel's waste water, it is simple to have an operating procedure, and the operation noise is low, take up an area of few, advantage such as anti-water yield changing capability is strong, and the Mao electricity is few.Add lime white and carry out breakdown of emulsion before oil trap, the pH value of sewage can be transferred to 8～9 simultaneously and be beneficial to follow-up coagulating, coagulating agent is selected FeSO for use ₄, control Fe ²⁺Concentration at 250～300mg/L, sedimentation time 30min, water outlet can be up to standard, after the activated carbon filter water outlet, CODcr is generally less than 100mg/L, SS is less than 9mg/L, oil-contg is less than 10mg/L, the pH value is between 7.2～7.8.

Summary of the invention

The object of the present invention is to provide a kind of hotel sewage to handle and reuse method, hotel sewage is reached handle emission request and reuse water quality requirement, compare with other method, not only wastewater through organic matter is removed in a large number, and the ammonia nitrogen of waste water, total phosphorus and colourity are all effectively removed, the every index of water outlet is better than reclaimed water matter standard, can satisfy the reuse water requirement.

To achieve these goals, the present invention has adopted anaerobic hydrolysis, coagulation air-float, oxygen enrichment bio-aeration oxidation and filtering technique coupling.Add spherical floating stuffing in the anaerobic pond, the living space of anaerobion is provided, by anerobe the acidication effect, the biorefractory organics such as tensio-active agent of effectively degrading have been eliminated follow-up air supporting and oxygen-enriched aeration process and have been produced the spittle, polluted air and surrounding environment.

Hotel sewage enters equalizing tank carry out the evenly temper of water quality, the water yield after; enter anaerobic hydrolysis-acidification pond reaction 4h by water pump lifting; effluent adopting volume pump dosing coagulant PAC 8～10mg/L; enter stop 2～5min in the pressurized vessel retort through water pump and line mixer; water outlet enters the dissolved air flotation pond through the pressurized vessel reliever and stops 40min; a large amount of scum silica frost is effectively removed; clear water enters the oxygen enrichment bio-oxidation pond and carries out biooxidation reactions 3h, and the biological tank water outlet is through gac filtration and ClO ₂Sterilization reaches the reuse water quality standard, satisfies national grade one discharge standard and requirement.

Coagulating agent is selected PAC, Al (SO for use ₄) ₃, wherein the PAC effect is preferable; Part pressurized dissolved air flotation, pressurized vessel reaction pressure 3～5kg/cm are adopted in air supporting ², reaction times 2～5min, the air flotation pool residence time 30～60min.

The oxygen enrichment biological treatment tank adopts elastic solid filler or combined stuffing, and is wherein preferable with combined stuffing, and aeration adopts the micro-pore aeration mode, and DO is controlled at 4～7mg/L in the pond, residence time 3h.

Activated charcoal filter is selected ature of coal type granulated active carbon for use, and particle diameter is φ 0.8～2mm.Top water inlet bottom water outlet.Combined water and air backwash regularly carries out manipulation of regeneration to gac, and backwashing water is back to anaerobic pond.

Go out water sterilization and adopt ClO ₂, dosage 2～3mg/L.

The invention has the beneficial effects as follows: (1) anaerobic fixed film reactor has added spherical biologic packing material, and the anaerobic bacterium that adheres to is many, the tensio-active agent of effectively having degraded, and removal effect is good, has eliminated the foam pollution that follow-up air supporting and aeration produce; (2) technology is stable, and effluent quality is good, is better than reclaimed water matter standard, satisfies the reuse requirement, has favorable economic benefit and environmental benefit; (3) reusing sewage has been realized utilization of wastewater resource, has eliminated environmental pollution.

Description of drawings

Fig. 1 is a process flow sheet of the present invention.

Embodiment

Embodiment 1

Certain hotel sewage, its water quality characteristic is as shown in table 1, adopts Fig. 1 process flow system of the present invention to handle.In the technology operational conditions be: (1) equalizing tank HRT is 4h; (2) anaerobic pond MLSS is 6g/L, and HRT is 4h; (3) PAC adds 8mg/L, reaction times 5min, dissolved air flotation residence time HRT 45min; (4) oxygen enrichment bio-oxidation pond HRT is 3h, and MLSS is 4～6g/L, and DO is 4～6mg/L; (5) charcoal absorption reaction 7min; (6) ClO ₂Dosage 3mg/L, reaction 5min handles, and result is as shown in table 1.

Certain hotel sewage water quality characteristic of table 1 and treatment effect (mg/L)

Water-quality guideline	COD _Cr	BOD ₅	pH	Colourity	SS	TN	TP	LAS
Water-quality guideline	COD _Cr	BOD ₅	pH	Colourity	SS	TN	TP	LAS	(oxygen enrichment biochemistry) handles back (disinfecting) after handling pre-treatment	256.3 15.7 12.2	89.8 7.8 6.4	7.4 8.7 8.3	35 17 15	47 15 10	12.8 0.7 0.5	5.9 0.6 0.3	2.6 0.1 0

From table 1 result as can be seen, hotel sewage is better than reclaimed water matter standard and requirement through treatment process system final outflow water, wherein handles the back water outlet through the oxygen enrichment bio-oxidation and reaches national grade one discharge standard and requirement.

Embodiment 2

Certain hotel sewage, its water quality characteristic is as shown in table 2, adopts Fig. 1 process flow system of the present invention to handle.In the technology operational conditions be: (1) equalizing tank HRT is 4h; (2) anaerobic pond MLSS is 6g/L, and HRT is 4h; (3) PAC adds 10mg/L, reaction times 5min, dissolved air flotation residence time HRT 45min; (4) oxygen enrichment bio-oxidation pond HRT is 3h, and MLSS is 5g/L, and DO is 5～6mg/L; (5) charcoal absorption reaction 6min; (6) ClO ₂Dosage 3mg/L, reaction 5min handles, and result is as shown in table 2.

Table 1 water quality characteristic and result (mg/L)

Water-quality guideline	COD _Cr	BOD ₅	pH	Colourity	SS	Turbidity	TN	TP	LAS
Water-quality guideline	COD _Cr	BOD ₅	pH	Colourity	SS	Turbidity	TN	TP	LAS	After handling pre-treatment	352.8 17.3	113.2 5.2	7.1 8.7	36 9	65.8 7.2	59.6 4.8	11.4 0.4	9.7 0.1	2.5 0.1

Claims

1. a hotel sewage is handled process of reusing, and it is to adopt anaerobic hydrolysis-air float-oxygen-enriched bio-contact oxidation-activated carbon filtration-ClO ₂The optimum combination integrated technology system handles hotel sewage of sterilization process makes it reach miscellaneous domestic water quality standard, satisfies the reusing sewage requirement.

2. the method for claim 1, after it is characterized in that sewage enters equalizing tank and carries out the evenly temper of water quality, the water yield, entering anaerobic fixed film reactor, coagulation floatation, oxygen enrichment bio-oxidation pond, activated carbon filter and sterilization pool successively handles, national grade one discharge standard and requirement are satisfied in the bio-oxidation pond water outlet, final outflow water is better than miscellaneous domestic water quality standard and requirement, satisfies the reusing sewage requirement.

3. the method for claim 1 is characterized in that, anaerobic pond HRT is 4h; Air flotation pool 40～60min; Oxygen enrichment bio-oxidation pond 3h; Activated carbon filter 5～10min; And ClO ₂Pond 3～5min.

4. the method for claim 1 is characterized in that, coagulating agent PAC dosage is 5～10mg/L; ClO ₂Dosage is 2～3mg/L.

5. the method for claim 1 is characterized in that, the oxygen enrichment bio-oxidation pond adopts the body biologic packing material, and as elastic filler, combined stuffing, the micro-pore aeration mode is adopted in the bottom, pond, and DO is controlled at 4～7mg/L in the pond.