Printing and dyeing wastewater treatment process without sludge discharge
A treatment process, printing and dyeing wastewater technology, applied in the direction of water/sludge/sewage treatment, textile industry wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problem of difficult to form sedimentation activated sludge, low COD removal rate, Poor degradability and other problems, to achieve the effect of improving COD removal rate, low one-time investment, and obvious treatment effect
Active Publication Date: 2013-02-20
HUAFANG
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Problems solved by technology
Among them, the main pollutants in the desizing wastewater are PVA, carboxymethyl cellulose, surfactants and cloth hair, the water quality is single, the degradability is poor, the content of sulfate radicals (3-5g / l) and Alkali content (3-5g / l) makes it difficult to form activated sludge with good sedimentation performance during anaerobic treatment alone, and the COD removal rate is low
Relying on a single physical and chemical treatment process has become a bottleneck in the treatment of printing and dyeing wastewater
Method used
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[0016] a. After adding inoculation sludge to IC anaerobic pool 2, discharge printing and dyeing desizing wastewater 1 into IC anaerobic pool 2, and add industrial glucose to IC anaerobic pool 2 at the same time, the addition amount is 2% of the raw water concentration, and inoculate The hydrolytic acidifying bacteria and methanogens in the sludge make most (70%-85%) of the soluble pollutants in the desizing wastewater undergo hydrolysis and methanation reactions to generate methane and carbon dioxide;
[0017] b. The waste water 7 other than printing and dyeing desizing waste water is discharged into the aerobic pool 4, and the aerobic pool 4 returns the nitrifying liquid to the anoxic pool 3;
[0018] C, the aerobic nitrification liquid discharged from the IC anaerobic tank 2 and the aerobic tank 4 are jointly discharged into the intermittent anoxic tank 3, and the supernatant in the anoxic tank 3 is discharged into the aerobic tank 4, and the supernatant in the anoxic tank 3 ...
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The invention relates to a printing and dyeing wastewater treatment process without sludge discharge. The process is as follows: desizing wastewater is processed by an IC anaerobic tank, then water is discharged, and the water and aerobic nitration solution enter an intermittent oxygen-poor tank together, so that denitrification, sulphur oxidization, sludge adsorption added value and sludge concentration are simultaneously conducted in the oxygen-poor tank, nitrate-state oxygen in the aerobic nitration solution is recovered, and sulphion concentration of the aerobic tank can be reduced, so that suspended particles in the discharged water in the IC anaerobic tank can be adsorbed, and the discharged water is cleared and discharged into an oxidation tank. Aerobic surplus sludge plays the role of adsorption and then enters a CSTA tank to be digested and reduced, and finally, the surplus sludge is processed by a filter press, and is pumped into a furnace in a fluid bed by a plunger pump to be burned. According to the process, the settling property of the settled sludge is improved, the removal rate of COD (Chemical Oxygen Demand) is improved, the zero discharge of the surplus sludge is realized, harmful gas can not be generated, the environmental protection and the high efficiency are realized, the process operability is strong, the one-time investment is low, and the treatment effect is obvious.
Description
technical field [0001] The invention relates to the field of refractory biodegradable industrial wastewater treatment, in particular to a printing and dyeing wastewater treatment process with zero sludge discharge. Background technique [0002] Pollutants in printing and dyeing wastewater are mainly dyes and surfactants, and iron salts are often added for decolorization, and the amount of residual sludge after treatment in biochemical pools is large. For example, a printing and dyeing factory with a daily wastewater discharge of 7000m3 will produce 100m3 of sludge with a moisture content of 80% per day. The use of landfill pollution will pollute the groundwater and cannot meet the requirements of environmental protection. The deep dehydration treatment method requires a large investment and low efficiency for the secondary filter press; it is difficult to treat the tail gas during drying, and the service life of the equipment is shortened due to the strong corrosion of the ...
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Login to View More IPC IPC(8): C02F9/14C02F11/12F23G7/00C02F103/30
Inventor 王力民罗维新孙国庆周新民李志海张炳营王希刚孙中然于涛赵奇生
Owner HUAFANG