Technique for the treatment of textile dyeing waste water
The present invention relates to a kind of waste water treatment process, relate in particular to a kind of technique for the treatment of textile dyeing waste water.
Can produce high pollution waste water in the printing and dyeing production process, pollution indexs such as the colourity of this class waste water, concentration of suspension, COD chemical oxygen demand (COD), BOD biochemical oxygen demand (BOD) are all very high, and because the water quality of waste water and the water yield are all unstable, more difficult.Usually biochemical method is adopted in the processing of dyeing waste water, but often treatment effect is undesirable in actual moving process, its major cause is that pollutant component complexity in the waste water, the water yield change greatly, more there is the additive that adopts in some waste water treatment process to be unfavorable for the growth of biological respinse bacterial classification, reaches reuse or emission standard so adopt these methods to be difficult to make waste water to be done.
Summary of the invention
The purpose of this invention is to provide a kind of effective technique for the treatment of textile dyeing waste water, overcome the deficiencies in the prior art.
The technical solution adopted in the present invention is to achieve the above object of the invention:
Technique for the treatment of textile dyeing waste water comprises the steps:
A, materialization are handled: the waste water that printing and dyeing workshop produces is disposed rubbish by grid, the pH value that drops into acid or alkali control waste water then is between 8～9, then add bodied ferric sulfate and carry out fade treatment, again the waste water after fading is left standstill processing, make wherein big suspended particle precipitation;
B, biochemical treatment: the organism in the dyeing waste water after with facultative anaerobe materialization being handled carries out anaerobic decomposition, makes to be difficult to biodegradable larger molecular organics in the waste water and to be converted into the small organic molecule that is easy to the biological biochemistry degraded; The waste water that then will hold concurrently behind the oxygen is introduced agitated pool, makes it stir, contact, adhere to the returnedactivatedsludge thorough mixing; Then waste water is introduced biochemical aeration tank, utilize the biofloculation bulk absorption in the pond, the organism in the decomposition waste water; Behind microbiological degradation, waste water is introduced second pond, the active sludge biological flocs unit that precipitates in the waste water is back in the agitated pool;
C, subsequent disposal: the thousandth dosing coagulant of pressing the clear liquid amount in the supernatant liquor after the biochemical treatment, make that remaining organism decomposition, water separate with mud in the clear water, use molten carbonated drink the suspended substance removal in the clear water then, it is standby after filtering clear water to be introduced the reuse water clean water basin again.
In the described biochemical treatment, waste water is stirred in the mixed once agitated pool with mixing of returnedactivatedsludge and carries out, and contact, stick in the secondary mixing agitated pool and carry out, and waste water residence time in two ponds is 10～20 minutes.
The envrionment conditions of described biochemical aeration tank is controlled at: 1) dissolved oxygen 2～4mg/L, 2) temperature is 35 ℃～40 ℃, 3) between the pH value 7.5～8.5,4) sludge settling ratio is controlled at about 28%～32%, 5) sludge concentration is controlled between 2～4g/L, 6) sludge volume index is controlled at 90～110ml/g; Wherein waste water is 40～60 hours in the biochemical aeration tank residence time.
Described coagulating agent is, in the described subsequent disposal, dosing coagulant carries out in the one-level air flotation pool in the clear liquid, its dissolved-air pressure is controlled in 4～4.5at scope, with molten carbonated drink a small amount of suspended substance removal in the clear water is carried out in the secondary air-floatation pond, its dissolved-air pressure is controlled in 3.5～4at scope.
The comprehensive physics of the present invention, chemistry, bioremediation adopt the multiple tracks handling procedure, and waste water not only reaches emission standard after treatment, also can be back to the workshop and utilize, to reach the purpose of cycling use of water; That the present invention also has is stable, reliable, processing cost is low, simple operation and other advantages.
Description of drawings
Fig. 1 is sewage treatment technology process figure of the present invention
Technique for the treatment of textile dyeing waste water comprises materialization processing, biochemical treatment and subsequent disposal three phases, referring to Fig. 1:
It mainly is by physics and chemical process waste water to be carried out preliminary treatment that materialization is handled, the waste water that printing and dyeing workshop is produced is flowed through and is introduced equalizing tank behind the grid, wherein the effect of grid is to remove a small amount of rubbish that produces in the production process, in order to avoid influence later process, drop into acid in the equalizing tank or alkali is controlled at about 8.5 the pH value of waste water; Waste water is guided to reaction tank again and added bodied ferric sulfate, add-on is every premium on currency 0.8 gram bodied ferric sulfate, and main effect is the colourity reduction with dyeing waste water; Then waste water is introduced preliminary sedimentation tank, because raw wastewater has a large amount of suspended substances, in order to reduce in the subsequent disposal program load to biochemical aeration tank, prevent that sedimentation of suspension from causing the obstruction of oxygen system in aeration tank inwall or bottom, allow waste water leave standstill for some time in preliminary sedimentation tank and make suspended substance precipitation, wastewater temperature also descends to some extent simultaneously.
Biochemical treatment mainly is to utilize microorganism that waste water is carried out core processing, to remove organism wherein.The steps include: the waste water after the materialization processing is introduced the oxygen compatibility pool that existence has facultative anaerobe, facultative anaerobe carries out incomplete decomposing to the larger molecular organics in the waste water under the anoxybiotic condition, make and be difficult to biodegradable larger molecular organics in the waste water and be converted into the small organic molecule that is easy to biological biochemistry degraded, improved the BOD/COD value of waste water, this autodigestion in the pond of mud decomposes a part; Waste water after the facultative anaerobe processing is flowed into the mixed once agitated pool, making returnedactivatedsludge after the biochemical treatment and the waste water behind the double oxygen obtain thorough mixing stirs, churning time is about 15 minutes, then waste water is incorporated into secondary mixing agitated pool, its effect is that the zoogloea with active sludge fully contacts, adheres to waste water, and the time also is about 15 minutes; Then waste water is introduced biochemical aeration tank and adopted Wastewater Treated by Activated Sludge Process waste water, biofloculation body by artificial culture is arranged in the biochemical aeration tank, it is made up of aerobic microorganism (comprising microfauna, bacterium and other mushrooms) and absorption, adherent organic substance and inorganic substance, the ability that has absorption and decompose organic substance in the waste water demonstrates chemical-biological activities; Wastewater Treated by Activated Sludge Process waste water, these biofloculation bodies are suspended in the biochemical aeration tank, organic substance in the waste water is fully contacted with active sludge microorganism, deliquescent organic substance is adsorbed and absorbs, the cytolemma that penetrates bacterium enters protoplasma, under the effect of desmo enzyme, carry out oxygenolysis, after the organic particle of colloidal state and suspended state is adsorbed in the waste water, resolve into the deliquescent organic substance of energy by the effect of bacterium exoenzyme earlier, and then enter cellular plasm, obtain to decompose by the organism in metabolism (comprising katabolism and anabolism) the one side waste water of microorganism, waste water also obtains handling, synthetic again on the other hand new cellular material, wherein the envrionment conditions of biochemical aeration tank is controlled at: 1) dissolved oxygen 2～4mg/L, 2) temperature is 35 ℃～40 ℃, 3) between the pH value 7.5～8.5,4) sludge settling ratio is controlled at about 30%, 5) sludge concentration is controlled between 2～4g/L, 6) sludge volume index is controlled at 100ml/g, and waste water is about 50 hours in the biochemical aeration tank residence time; Behind microbiological degradation, waste water introducing second pond delay for some time is precipitated, be back in the mixed once agitated pool active sludge biological flocs unit that precipitates standby.
Subsequent disposal is that the supernatant liquor after the biochemical treatment is further handled, make its allow compliance with emission standards, the steps include: clear liquid is introduced the one-level air flotation pool, and press the thousandth dosing coagulant of clear liquid amount, remaining organism in the clear liquid is decomposed, make mud and water sepn, its dissolved-air pressure is controlled in the 4-4.5at scope; Then clear liquid is imported the secondary air-floatation pond, with dissolved air water the suspended substance of emersion in the one-level air flotation pool is removed in this pond, dissolved-air pressure is controlled in the 3.5-4at scope; Clear liquid is flowed through respectively air supporting clean water basin, valveless filtering pool and reuse water clean water basin, wherein the effect of valveless filtering pool is that clear liquid is filtered, and at last clear water is offered printing and dyeing workshop production and uses, to reach the purpose of cycling use of water again.