Dyeing sewage decoloration treatment process
Technical field
The present invention relates to dyeing and printing sewage processing, particularly a kind of dyeing sewage decoloration treatment process.
Background technology
Dyeing and printing sewage is the sewage that contains a large amount of dyestuffs that printing and dyeing mill produces in the dyeing course of processing.At present, the dyestuff 10-20% using in dyeing and printing process process can enter in waste water and discharge to the external world, and environment has been caused to very serious pollution.The water yield of the dyeing and printing sewage producing due to the printing dye operation of textile industry is larger, colourity is higher, complicated component, in waste water, contain fuel, slurry, auxiliary agent, acid, alkali, fiber impurity and various inorganic salt, wherein, amino-complex in dye structure and some metallic element thereof all have larger toxicity, can cause serious pollution to environment.
The decolouring of the dyestuffs such as the Methylene blue, magenta and the Victoria Green WPB that contain in existing dyeing and printing sewage is difficulty very.For these dyeing and printing sewages, existing dyeing and printing sewage treatment process can not be processed effectively to these dyeing and printing sewages.The discoloring agent that the existing dyeing and printing sewage treatment process of part is used is expensive, cannot adapt to existing dyeing and printing sewage processing.
Summary of the invention
The present invention is directed to existing dyeing and printing sewage treatment process decolorizing effect not good, the shortcoming that cost is higher, provides a kind of with low cost, the novel dyeing sewage decoloration treatment process of good decolorizing effect.
For achieving the above object, the present invention can take following technical proposals:
Dyeing sewage decoloration treatment process, the sewage disposal device using comprises equalizing tank, coagulative precipitation tank, anaerobic fixed film reactor, active sludge aeration tank, second pond; Described dyeing sewage decoloration treatment process comprises following concrete steps:
A. by dyeing and printing sewage by after fine fack, inject equalizing tank and carry out adsorption bleaching processing, carry out aeration to injecting air in equalizing tank simultaneously;
B. the sewage after adsorption treatment in step a is injected to coagulative precipitation tank, precipitate to dropping into coagulating agent in coagulative precipitation tank;
C. the sewage after precipitation process in step b is injected to anaerobic fixed film reactor, processing is under anaerobic hydrolyzed;
D. the sewage after hydrolysis treatment in step c is injected to active sludge aeration tank, carry out the Air Exposure under aerobic condition to injecting air in active sludge aeration tank;
E. the sewage after Air Exposure in steps d is passed into second pond and carry out secondary sedimentation;
F. in step e, the water outlet after secondary sedimentation is discharged to the external world;
Wherein, in step a, carry out the weight proportion of each composition in sorbing material that adsorption bleaching processing uses as follows:
Water-soluble binder 5-10%;
Wood sawdust 0-30%;
The mixture 10-15% of Pericarppium arachidis hypogaeae and corn cob;
Orange peel 0-5%;
Pomelo's skin 0-28%;
Yellow paper pulp 6-10%;
Discoloring agent 6-9%;
Aeration tank mud 1-4%;
Coal ash 0-30%.
As preferably, in described sorbing material, the weight proportion of each composition is:
Water-soluble binder 10%;
Wood sawdust 30%;
The mixture 13% of Pericarppium arachidis hypogaeae and corn cob;
Orange peel 5%;
Pomelo's skin 25%;
Yellow paper pulp 8%;
Discoloring agent 7%;
Aeration tank mud 2%.
As preferably, described sorbing material is the spherical sorbing material of diameter 50-70mm.
As preferably, the equalizing tank pond face of every 12m × 8m is thrown in 4000-5000 spherical sorbing material.
As preferably, the temperature of described equalizing tank is 15-38 DEG C, and pH value is adjusted to 5-6.
As preferably, be 14-16 days the duration of service of described sorbing material, the sorbing material centrifuge dehydration after use and dry after can recycle.
As preferably, in described dyeing and printing sewage, contain Methylene blue, magenta, Victoria Green WPB.
As preferably, the coagulating agent using in step b is PAM or PAC or iron(ic) chloride.
As preferably, the mud in described second pond is back to active sludge aeration tank by anaerobic fixed film reactor.
As preferably, the mud in described equalizing tank, coagulative precipitation tank and second pond after precipitation is cake outward transport processed after sheet frame dehydration.
The present invention, owing to having adopted above technical scheme, has significant technique effect:
Can remove targetedly the dyestuffs such as Methylene blue, magenta and Victoria Green WPB in sewage, decolorizing efficiency is high, is 92.3-94.71% to the percent of decolourization of Methylene blue, and the percent of decolourization of magenta is exceeded to 97.72%, percent of decolourization to Victoria Green WPB exceedes 96.84%, and overall percent of decolourization can reach 97.17%.With low cost, sewage cost per ton is about 0.08 yuan.
In the sorbing material using, contain aeration tank mud, can utilize fully the mud producing in active sludge aeration tank, reduced required sludge quantity to be processed of later stage, reduced sludge treatment expense.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of dyeing sewage decoloration treatment process of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
The water-soluble binder using in following examples is the weight ratio gelatine that is 1:2 and the mixture of carpenter's glue.The carpenter's glue using also can be replaced by white glue with vinyl.
The PAM using refers to polyacrylamide, and PAC is polymerize aluminum chloride.
The discoloring agent using is the BWD-01 high-efficiency decolorant purchased from Lan Bo chemical company.
The aeration tank mud that contains microorganism using is taken from active sludge aeration tank 4.The present invention carries out on improved basis existing activated sludge process, the improvement of carrying out for the dyeing and printing sewage that contains Methylene blue, magenta, Victoria Green WPB.While using Wastewater Treated by Activated Sludge Process dyeing and printing sewage, in aeration tank, can produce corresponding mud, these mud are pulled out from aeration tank, both can be used for described sorbing material; In addition, in the process of dyeing sewage decoloration treatment process of the present invention, also can be in active sludge aeration tank 4 kinds produce mud, these mud also can be for the preparation of described sorbing material.
Embodiment 1
Dyeing sewage decoloration treatment process, as shown in Figure 1, the sewage disposal device using comprises equalizing tank 1, coagulative precipitation tank 2, anaerobic fixed film reactor 3, active sludge aeration tank 4, second pond 5; Described dyeing sewage decoloration treatment process comprises following concrete steps:
A. the dyeing and printing sewage that contains Methylene blue, magenta, Victoria Green WPB is passed through after fine fack 6, inject equalizing tank 1 and carry out adsorption bleaching processing, when adsorption bleaching, use special sorbing material, in described sorbing material, contain water-soluble binder, it is the spherical of 50-70mm that sorbing material is made to diameter.The equalizing tank that is every 12m × 8m to the number of the sorbing material of throwing in equalizing tank 11 pond face is thrown in 4000-5000 above-mentioned spherical sorbing material, simultaneously carry out aeration to injecting air in equalizing tank 1, in order to ensure adsorption effect, while using above-mentioned sorbing material, the temperature that should keep equalizing tank 1 is 15-38 DEG C, pH value is adjusted to 5-6, be 14-16 days the duration of service of described sorbing material, use and after 14-16 days need sorbing material to salvage from equalizing tank 1, after carrying out centrifuge dehydration and drying, above-mentioned sorbing material can recycle;
B. the sewage after adsorption treatment in step a is injected to coagulative precipitation tank 2, precipitate to dropping into the coagulating agent such as PAM or PAC or iron(ic) chloride in coagulative precipitation tank 2;
C. the sewage after precipitation process in step b is injected to anaerobic fixed film reactor 3, processing is under anaerobic hydrolyzed;
D. the sewage after hydrolysis treatment in step c is injected to active sludge aeration tank 4, carry out the Air Exposure under aerobic condition to injecting air in active sludge aeration tank 4;
E. the sewage after Air Exposure in steps d is passed into second pond 5 and carry out secondary sedimentation, the mud in described second pond 5 is back to active sludge aeration tank 4 by anaerobic fixed film reactor 3, and the continuous circulation of above-mentioned sludge reflux process is carried out repeatedly;
F. in step e, the water outlet after secondary sedimentation has reached relevant emission standards, can discharge to the external world;
Wherein, in step a, carry out the weight proportion of each composition in sorbing material that adsorption treatment uses as follows:
Water-soluble binder 5-10%;
Wood sawdust 0-30%;
The mixture 10-15% of Pericarppium arachidis hypogaeae and corn cob;
Orange peel 0-5%;
Pomelo's skin 0-28%;
Yellow paper pulp 6-10%;
Discoloring agent 6-9%;
Aeration tank mud 1-4%;
Coal ash 0-30%.
By the cake outward transport processed after sheet frame dehydration of the mud after precipitation in described equalizing tank 1, coagulative precipitation tank 2 and second pond 5.
Simultaneous test
Now dyeing sewage decoloration treatment process described in embodiment 1 and existing dyeing sewage decoloration method are contrasted, result is as shown in the table:
* be the percent of decolourization of gained after employing prior art processing dyeing and printing sewage.
Percent of decolourization in upper table is respectively the percent of decolourization that dyeing and printing sewage uses Methylene blue after the countless decoloration treatment methods of printing and dyeing of the present invention, magenta, Victoria Green WPB, and the contained overall percent of decolourization of upper table is the pigment removal of above-mentioned dyeing and printing sewage entirety after decolouring is processed.As can be known from the above table, dyeing sewage decoloration treatment process of the present invention compared to existing technology, is that percent of decolourization or the overall percent of decolourization of specific pigment all has higher lifting.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.