CN104628215A - Environmentally friendly technology for treating printing and dyeing wastewater through contact oxidation process - Google Patents

Abstract

The invention relates to an environmentally friendly technology for treating printing and dyeing wastewater through a contact oxidation process. The technology concretely includes the following steps: printing and dyeing wastewater goes through a grid to remove large suspensions and floating substances, obtained wastewater enters an equalizing tank and undergoes water flow adjustment and quality balancing, obtained wastewater is lifted to a hydrolysis acidification tank through a pump, and the tank is only controlled in an acidic fermentation stage in order to improve the biodegradability of wastewater; hydrolysis acidification effluent self-flows to a contact oxidation tank and is acted by microbes in the contact oxidation tank to remove most organic matters and chroma, obtained water enters a sedimentation tank, and sludge in the sedimentation tank returns to the hydrolysis acidification tank; and an elastic stereo filler is arranged in the tank to control the dissolved oxygen (DO) in a range of 0-0.5mg/L. Compared with traditional technologies, the technology provided by the invention has the advantages of better treatment effect, low energy consumption, less mud production, and direct dehydration of residual sludge. A coagulation sedimentation tank and a decolorization oxidation tank are arranged behind the sedimentation tank to realize three stage treatment in order to obtain water with good quality, and parts of the outlet water can be reused in production. The combination technology improves the treatment effect of the printing and dyeing wastewater, and is practical.

Description

Treatment of Dye green technology

Technical field

The present invention relates to Treatment of Dye green technology, belong to techniques of Dyeing Wastewater Treatment field.

Background technology

Along with the development of printing and dyeing industry, a large amount of fiber product occurs, the application of new chemical sizwe, dye material and finishing composition etc., the composition of dyeing waste water is made to there occurs change, intractability strengthens, the water outlet COD of simple aerobic biological process for treating, colourity are difficult to up to standard, and the Shui that biological process and chemical method combine separates Suanization – Jie and touches Yangization – coagulation process and can address this problem.

Summary of the invention

The object of the present invention is to provide a Treatment of Dye green technology, more to process for waste water to environmental protection.

To achieve these goals, technical scheme of the present invention is as follows:

A kind of Treatment of Dye green technology, specifically comprises the following steps:

(1) dyeing waste water enters equalizing tank after removing larger suspended substance and floating matter by grid, the adjustment of the water yield and the equilibrium of water quality is carried out at this, then be promoted to hydrolysis acidification pool with pump, this pond only controls in the acid fermentation stage, to improve the biodegradability of waste water;

(2) acidication water outlet is from flowing into contact-oxidation pool, and entering settling tank in contact-oxidation pool after microbial process removes the organism of the overwhelming majority and colourity, the mud of settling tank is all back to hydrolysis acidification pool; In order to obtain better water quality, secondary biochemical effluent through coagulating sedimentation and decolouring oxidation pond, makes stable water outlet, qualified discharge again;

(3) organic removal: the most economical most effective means of useless Organic substance in water is removed in biology aerobic process, and aerobic treatment requires that the biodegradability of waste water is good, its BOD5/COD>0.3, and its organism is easily degraded; Now because fabric not only has natural fiber, and also have a large amount of regenerated fibers, cause kind of dyes used to increase, some of them are difficult to biological degradation; Certain dye house effluents design acidication hydraulic detention time is 10h, and place elastic solid filler in pond, controlling dissolved oxygen DO in pond is 0 ~ 0.5mg/L, general gas-water ratio (5 ~ 7): 1, and pond body is of a size of 10 × 7.8 × 5.0m; Waste water is after acidication, and its biodegradability is greatly improved, and COD declines to some extent;

(4) contact-oxidation pool is the main process for the treatment of of dyeing wastewater, and design water is 2 ~ 4mg/L, and place elastic stereo in pond and fill up the soft combined stuffing with half, adopt micro-pore aeration bottom it, pond body is of a size of 11 × 5.0 × 5.0m; Now, in waste water, most organic part obtains removal, but still has certain colourity and the organism of difficult degradation, so at bio-contact oxidation water outlet coagulating sedimentation again after precipitation solid-liquid separation;

(5) removal of colourity: carry out a biological disposal upon to dye chroma in waste water remove generally only have 50% ~ 60%; And the coagulating sedimentation decolouring in physico-chemical process can reach 50% ~ 90%, generally all there is good removal effect to substantive dyestuff, vat dyes, thioxine dyes, dispersed dye and colloidalmaterial, chroma removal rate can reach 80% ~ 90%, COD clearance can reach 50% ~ 80%, but to matching stain, reactive dyestuffs, metallized dye and cationic dyestuff etc., its decolorizing effect is not good, generally only has 50% ~ 60%; At present general polymerize aluminum chloride (PAC) makes coagulating agent, and it has certain decolorizing effect to various dyestuff, and when its dosage is 0.05%, to the decolorizing effect of 5 class dyestuffs, it is as shown in the table; PAC is better to the decolorizing efficiency of the coating in suspended state in waste water, vat dyes, takes second place to thioxine dyes, Naphthol dyestuff, poor to water-soluble reactive colour decolorizing effect; Increase PAC dosage, can decolorizing effect be improved; Such as, to the dyeing waste water of Containing Sulfur dyestuff and Naphthol dyestuff, when PAC dosage is increased to 0.08% and 0.1%, its decolorizing efficiency brings up to 81% and 90% by corresponding, but processing costs also corresponding increase; In addition PAM (polyacrylamide) and PAC are acted synergistically, will greatly reduce the dosage of PAC;

(6) dyeing waste water is after coagulating kinetics, if water outlet still has darker color and luster, must decolour further, can adopt oxygenant to process.

This beneficial effect of the invention is: dyeing waste water is through acidication process, the larger molecular organics of the difficult degradation in waste water, resolve into simple small organic molecule, as organic acid, alcohols, the BOD/COD of waste water is improved, improve the biodegradability of waste water, thus the pond decreasing follow-up aerobic treatment holds, and saves energy consumption; After contact-oxidation pool goes out water precipitation, mud is all back to hydrolysis acidification pool, enters solubilising and shrink volumetric reaction, excess sludge is significantly reduced in pond, and excess sludge can be easy to Direct Dehydration after concentrated; Because the biodegradability of waste water improves, the corresponding raising of bio-contact oxidation organic removal rate, water miscible COD is removed effectively, and COD, BOD concentration of settling tank water outlet is lower, and coagulant charging quantity greatly reduces, and working cost reduces; Decolouring oxidation pond, as the guarantee technique of color removal, if can come into operation when colourity is not up to standard, generally can surmount discharge.

Acidication-catalytic oxidation-coagulation process is as the alternative techniques of conventional activated sludge process, and its treatment effect is obviously better than traditional technology, has the feature that energy consumption is low, sludge output is few, and excess sludge can Direct Dehydration; Arrange coagulative precipitation tank and decolouring oxidation pond after settling tank, as tertiary treatment, can obtain good effluent quality, part water outlet can be back to production, and this combination process improves the practicable method of disposal effect of dyeing wastewater.

Embodiment

Below in conjunction with embodiment, the specific embodiment of the present invention is described, better to understand the present invention.

Embodiment

A kind of Treatment of Dye green technology, specifically comprises the following steps:

(1) dyeing waste water enters equalizing tank after removing larger suspended substance and floating matter by grid, the adjustment of the water yield and the equilibrium of water quality is carried out at this, then be promoted to hydrolysis acidification pool with pump, this pond only controls in the acid fermentation stage, to improve the biodegradability of waste water;

(2) acidication water outlet is from flowing into contact-oxidation pool, and entering settling tank in contact-oxidation pool after microbial process removes the organism of the overwhelming majority and colourity, the mud of settling tank is all back to hydrolysis acidification pool; In order to obtain better water quality, secondary biochemical effluent through coagulating sedimentation and decolouring oxidation pond, makes stable water outlet, qualified discharge again;

(3) organic removal: the most economical most effective means of useless Organic substance in water is removed in biology aerobic process, and aerobic treatment requires that the biodegradability of waste water is good, its BOD5/COD>0.3, and its organism is easily degraded; Now because fabric not only has natural fiber, and also have a large amount of regenerated fibers, cause kind of dyes used to increase, some of them are difficult to biological degradation; Certain dye house effluents design acidication hydraulic detention time is 10h, and place elastic solid filler in pond, controlling dissolved oxygen DO in pond is 0 ~ 0.5mg/L, general gas-water ratio (5 ~ 7): 1, and pond body is of a size of 10 × 7.8 × 5.0m; Waste water is after acidication, and its biodegradability is greatly improved, and COD declines to some extent;

(4) contact-oxidation pool is the main process for the treatment of of dyeing wastewater, and design water is 2 ~ 4mg/L, and place elastic stereo in pond and fill up the soft combined stuffing with half, adopt micro-pore aeration bottom it, pond body is of a size of 11 × 5.0 × 5.0m; Now, in waste water, most organic part obtains removal, but still has certain colourity and the organism of difficult degradation, so at bio-contact oxidation water outlet coagulating sedimentation again after precipitation solid-liquid separation;

(5) removal of colourity: carry out a biological disposal upon to dye chroma in waste water remove generally only have 50% ~ 60%; And the coagulating sedimentation decolouring in physico-chemical process can reach 50% ~ 90%, generally all there is good removal effect to substantive dyestuff, vat dyes, thioxine dyes, dispersed dye and colloidalmaterial, chroma removal rate can reach 80% ~ 90%, COD clearance can reach 50% ~ 80%, but to matching stain, reactive dyestuffs, metallized dye and cationic dyestuff etc., its decolorizing effect is not good, generally only has 50% ~ 60%; At present general polymerize aluminum chloride (PAC) makes coagulating agent, and it has certain decolorizing effect to various dyestuff, and when its dosage is 0.05%, to the decolorizing effect of 5 class dyestuffs, it is as shown in the table; PAC is better to the decolorizing efficiency of the coating in suspended state in waste water, vat dyes, takes second place to thioxine dyes, Naphthol dyestuff, poor to water-soluble reactive colour decolorizing effect; Increase PAC dosage, can decolorizing effect be improved; Such as, to the dyeing waste water of Containing Sulfur dyestuff and Naphthol dyestuff, when PAC dosage is increased to 0.08% and 0.1%, its decolorizing efficiency brings up to 81% and 90% by corresponding, but processing costs also corresponding increase; In addition PAM (polyacrylamide) and PAC are acted synergistically, will greatly reduce the dosage of PAC;

(6) dyeing waste water is after coagulating kinetics, if water outlet still has darker color and luster, must decolour further, can adopt oxygenant to process.

The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.

Claims (1)

1. a Treatment of Dye green technology, is characterized in that: specifically comprise the following steps:

(1) dyeing waste water enters equalizing tank after removing larger suspended substance and floating matter by grid, the adjustment of the water yield and the equilibrium of water quality is carried out at this, then be promoted to hydrolysis acidification pool with pump, this pond only controls in the acid fermentation stage, to improve the biodegradability of waste water;

(2) acidication water outlet is from flowing into contact-oxidation pool, and entering settling tank in contact-oxidation pool after microbial process removes the organism of the overwhelming majority and colourity, the mud of settling tank is all back to hydrolysis acidification pool;

(3) organic removal: place elastic solid filler in pond, controlling dissolved oxygen DO in pond is 0 ~ 0.5mg/L, general gas-water ratio (5 ~ 7): 1, and pond body is of a size of 10 × 7.8 × 5.0m; Waste water is after acidication, and its biodegradability is greatly improved, and COD declines to some extent;

(4) contact-oxidation pool is the main process for the treatment of of dyeing wastewater, and design water is 2 ~ 4mg/L, places elastic stereo and fills up the soft combined stuffing with half, adopt micro-pore aeration bottom it in pond;

(5) removal of colourity: to the dyeing waste water of Containing Sulfur dyestuff and Naphthol dyestuff, when PAC dosage is increased to 0.08% and 0.1%, its decolorizing efficiency brings up to 81% and 90% by corresponding;

(6) dyeing waste water is after coagulating kinetics, if water outlet still has darker color and luster, must decolour further, can adopt oxygenant to process.