A kind of closed printing and dyeing wastewater treatment system
Technical field
The present invention relates to a kind for the treatment of system of closed dyeing waste water, belong to the water treatment field in environment protection.
Background technology
It is environmental protection and energy saving (low-carbon (LC)) problem that Development of Textile Industry one of mainly hinders, and the subject matter of environmental protection is waste water, and about 80% textile waste comes from dyeing.Statistic data shows, and textile waste quantity discharged 2,300,000,000 tons in 2008, occupies each industrial trade the 3rd, account for 10.60% of national discharged volume of industrial waste water.Chemical oxygen demand (COD) (CODCr) quantity discharged 31.4 ten thousand tons in textile industry waste discharge, occupies each industrial trade the 4th, accounts for 7.76% of national trade effluent CODCr.These data are the statistic datas to the above enterprise of scale, and real data is much larger possibly.In fact dyeing is the competitive industry based on medium-sized and small enterprises, and medium-sized and small enterprises proportion accounts for 99.6%, and non-public enterprises account for 95%, and a large amount of small businesss data are also not included in.If need carry out dyeing and printing process in 70% of fiber process amount, then waste discharge is about about 3,000,000,000 tons year.
The successful example of dye house effluents process is more, but not good quite a few of effect, its reason roughly has following several situation: (1) printing and dyeing mill does not analyze self waste water speciality (water quality, the water yield), and indiscriminately imitate his factory's experience, result is often undesirable.(2) by the design specifications of municipal sewage treatment, for treatment of dyeing wastewater, only change some parameters, cause very large loss.Particularly in early days, large-scale dye house effluents focuses on, and be all responsible for by larger design institute, and it is understood in depth not to dyeing waste water character, causes very large loss.(3) new technology, novel process, new medicament are without pilot scale, are directly used in engineering, cause a lot of failure.New technology is many through lab scale, pilot scale, should could be used for engineering, and general examination scale is 3% ~ 5% of the engineering water yield, namely about maximum magnify 20.Laboratory study achievement is directly used in engineering, and difficulty has successful case.Engineering should adopt ripe, the safest technology.(4) waste water that production technique is close, can adopt similar treatment process, but also according to water quality, the suitable adjustment technology parameter of the water yield, will ensure processing horizontal.(5) actual motion technology and administrative skill improper, according to waste water change appropriately adjust, be also the reason of fluctuation of service.
The rise of Silk and the progress of finishing process in printing and dye-ing technology, the bio-refractory organism such as PVA slurry, artificial silk alkaline hydrolysis thing (mainly O-phthalic acids material), New-type adjuvant are made to enter dyeing waste water in a large number, its COD concentration also rises to 2000 ~ 3000mg/L by original hundreds of mg/L, thus make original biological treatment system COD clearance drop to about 50% from 70%, even lower.Traditional biological treatment is subject to serious challenge; Traditional chemical precipitation and the COD clearance of By Bubble-floating Method to this kind of dyeing waste water are also only about 30%.Therefore the effective techniques of Dyeing Wastewater Treatment of exploiting economy becomes the problem that current environmental protection industry (epi) is paid close attention to day by day.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of closed printing and dyeing wastewater treatment system, this system comprises, between strainer, water reservoir, equalizing tank, reaction tank, quartz sand filter tank, gac filter tank, floating stuffing filter tank, back flushing, external automatic medicament feeding machine, gas blower, backwashing pump, clean water basin etc., dyeing waste water enters the water inlet of strainer by pipeline, the water outlet of strainer connects the water inlet of water reservoir by pipeline, the water outlet of water reservoir connects the water inlet of equalizing tank by pipeline, the water outlet of equalizing tank passes through the water inlet in pipeline ligation pond, the water outlet of reaction tank connects the water inlet of quartz sand filter tank by pipeline, the water outlet of quartz sand filter tank connects the water inlet of gac filter tank by pipeline, the water outlet of gac filter tank connects the water inlet of floating stuffing filter tank by pipeline, the water outlet of floating stuffing filter tank connects drainage pipeline, the first back flushing outlet between back flushing connects the back flushing entrance of quartz sand filter tank by pipeline, the second back flushing outlet between back flushing connects the back flushing entrance of gac filter tank by pipeline, the 3rd back flushing outlet between back flushing connects the back flushing entrance of floating stuffing filter tank by pipeline, the liquid dosing mouth of external automatic medicament feeding machine connects first of equalizing tank by pipeline and to be used as medicine mouth, the solid dosing mouth of external automatic medicament feeding machine connects second of equalizing tank by pipeline and to be used as medicine mouth, wherein arrange pH meter in equalizing tank, adjustment pH is 3-5, arranges under meter, adds FeSO
4amount be 1g/L, add H
2o
2amount be 2.67mL/L, the residence time is set to 1h, and reaction tank outer wall is provided with insulating protective layer, is provided with irony electrode pair in pond, and interval 10cm between electrode, adds flocculation agent FeCl
3, be 1A by electric current between irony electrode during reaction, in gac filter tank, be provided with dissolved oxygen instrument, dissolved oxygen controls at 4mg/L, and hydraulic detention time is 1h, is provided with the cobble supporting layer of high 20cm at the bottom of tank, cobble supporting layer is filled with the active carbon layer that thickness is 200cm, elevation of water surface is 250cm, and gac selects coal mass active carbon, coal mass active carbon size 0.4mm, porosity 50%-60%, tap density 400kg/m
3, in floating stuffing filter tank, be provided with dissolved oxygen instrument, dissolved oxygen controls at 4mg/L, hydraulic detention time is 2h, is provided with the cobble supporting layer of high 20cm at the bottom of tank, cobble supporting layer is loaded the hollow modified plastics floating stuffing layer that thickness is 230cm, porosity 98%, tap density 60kg/m
3, elevation of water surface is 250cm, current design upper entering and lower leaving, be provided with gas blower, backwashing pump and clean water basin between back flushing, filter tank back flushing adopts the mode that gas rushes, air water combines flushing, water rinse combines, and namely first gas rushes 30min, air water combines flushing 30min again, the mode of last water rinse 15min.
Equalizing tank and reaction tank leave dosing mouth, manual dosing or external doser Automatic Dosing can be carried out.
Quartz sand filter tank, gac filter tank and floating stuffing filter tank are detachable filter tank, manually can carry out replacing and the cleaning of filler.
Quartz sand filter tank, gac filter tank and floating stuffing filter tank leave water intaking and detect mouth, tank body adopts transparent material manufacture to form simultaneously.
Whole system adopts programmable logic controller to operate, and realizes the automatic control of pump switch.
The invention has the advantages that:
(1) stable equipment operation, floor space is little, and hydraulic detention time is short.
(2), in the sanitary wastewater by native system process, the clearance of chemical oxygen demand (COD) reaches 97.1%; The clearance of total nitrogen reaches 96.2%, and the clearance of five-day BOD reaches 96.6%, and the clearance of suspended substance reaches 94.9%, chroma removal rate 92.1%, turbidity removal rate 98.3%.
(3) the material soil removability selected is strong, and surface hydrophilic power is strong, and investment running cost is low.
(4) safeguard that easily operating automation degree is high, does and makes high efficient and reliable, and the construction period is short, has mobility.
Accompanying drawing explanation
Fig. 1 is a kind of equipment schematic diagram of the closed Waste Water Treatment that ignites.
Between 1-strainer, 2-water reservoir, 3-equalizing tank, 4-reaction tank, 5-quartz sand filter tank, 6-gac filter tank, 7-floating stuffing filter tank, 8-back flushing, the external automatic medicament feeding machine of 22-, 23-clean water basin, 24-backwashing pump, 25-gas blower.
Embodiment
A kind of closed printing and dyeing wastewater treatment system, this system comprises, between strainer 1, water reservoir 2, equalizing tank 3, reaction tank 4, quartz sand filter tank 5, gac filter tank 6, floating stuffing filter tank 7, back flushing 8, external automatic medicament feeding machine 22, gas blower 25, backwashing pump 24, clean water basin 23.Dyeing waste water connects the water inlet entering strainer 1 by pipeline, the water outlet of strainer 1 connects the water inlet of water reservoir 2 by pipeline, the water outlet of water reservoir 2 connects the water inlet of equalizing tank 3 by pipeline, the water outlet of equalizing tank 3 passes through the water inlet in pipeline ligation pond, the water outlet of reaction tank 4 connects the water inlet of quartz sand filter tank 5 by pipeline, the water outlet of quartz sand filter tank 5 connects the water inlet of gac filter tank 6 by pipeline, the water outlet of gac filter tank 6 connects the water inlet of floating stuffing filter tank 7 by pipeline, the water outlet of floating stuffing filter tank 7 connects drainage pipeline, between back flushing, the first back flushing outlet of 8 connects the back flushing entrance of quartz sand filter tank 5 by pipeline, the second back flushing outlet between back flushing connects the back flushing entrance of gac filter tank 6 by pipeline, the 3rd back flushing outlet between back flushing connects the back flushing entrance of floating stuffing filter tank 7 by pipeline, the liquid dosing mouth of external automatic medicament feeding machine 22 connects first of equalizing tank by pipeline and to be used as medicine mouth, the solid dosing mouth of external automatic medicament feeding machine 22 connects second of equalizing tank 3 by pipeline and to be used as medicine mouth.Wherein, arrange pH meter in equalizing tank 3, adjustment pH is 3-5, arranges under meter, adds FeSO
4amount be 1g/L, add H
2o
2amount be 2.67mL/L, the residence time is set to 1h.Reaction tank outer wall is provided with insulating protective layer, in be provided with irony electrode, interval 10cm between electrode, adds flocculation agent FeCl
3, during reaction, between irony electrode, be set to 1A by electric current.In gac filter tank, be provided with dissolved oxygen instrument, dissolved oxygen controls at 4mg/L, hydraulic detention time is 1h, be provided with cobble at the bottom of tank, cobble support floor height 20cm, it is 200cm that active carbon layer loads thickness, elevation of water surface is 250cm, current design upper entering and lower leaving, gac selects coal mass active carbon, coal mass active carbon size 0.4mm, porosity 50%-60%, tap density 400kg/m
3.In suspended substance filler, be provided with dissolved oxygen instrument, dissolved oxygen controls at 4mg/L, hydraulic detention time is 2h, is provided with cobble at the bottom of tank, cobble support floor height 20cm, it is 230cm that packing layer loads thickness, elevation of water surface is 250cm, and filler is full of whole filter tank, current design upper entering and lower leaving, filling tank fills hollow modified plastics floating stuffing, its size 15mm, porosity 98%, tap density 60kg/m
3.Be provided with gas blower, backwashing pump and clean water basin between back flushing, filter tank back flushing adopts the mode of gas punching, the punching of gas punching+water, water rinse, and namely first gas rushes 30min, then air water combines flushing 30min, the mode of last water rinse 15min.