A kind of treatment method of recycled polyester production wastewater
A technology for the production of wastewater and recycled polyester, which is applied in natural water treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of high energy consumption and high processing cost of distillation, and achieve energy consumption Low cost, low waste water treatment cost, and the effect of improving COD removal rate
Active Publication Date: 2017-03-01
YANGZHOU UNIV
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Problems solved by technology
The following problems exist in the use of such wastewater technology: the distillation method consumes a lot of energy, and only part of the distillate can be processed, and the macromolecular organic substances with high boiling points that are difficult to volatilize remain in the distillation mother liquor, which can only be treated as hazardous waste, and the treatment cost is extremely high
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[0029] Depend on figure 1 It can be seen that the present invention is a method for treating wastewater from recycled polyester production, which includes physical chemical treatment and biological treatment, and includes the following steps in turn:
[0030] (1) The wastewater is firstly oxidized in chemical oxidation tank 1 (first chemical oxidation tank), and part of COD is removed by the action of chemical reagents, and part of the refractory organic matter is decomposed into easily degradable organic matter with smaller molecular weight to improve its biodegradability.
[0031] (2) The wastewater after chemical oxidation enters the neutralization adjustment tank 1, and the pH of the wastewater is adjusted to 6.5.
[0032] (3) The wastewater whose pH value is adjusted to 6.5 is dehydrated by centrifugal dehydrator 1 .
[0033] (4) The dehydrated wastewater is subjected to the first biochemical treatment through anoxic tank - sedimentation tank 1 (first sedimentation tank)...
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Abstract
The invention relates to a treatment method for wastewater produced by recycled polyester. In the present invention, the recycled polyester production waste water enters the first chemical oxidation pool, and enters the first neutralization adjustment pool after chemical oxidation, the pH is adjusted to 6.5, dehydrated by the first centrifugal dehydrator, and passed through the anoxic pool-the first sedimentation tank-the second The first aerobic tank-the second sedimentation tank performs the first biochemical treatment, the second chemical oxidation tank performs chemical treatment, adjusts pH=4, removes part of COD, enters the second neutralization adjustment tank, adjusts the pH to 7.5, and passes through the second Centrifugal dehydrator dehydration, the second biochemical treatment through the second aerobic tank-the third sedimentation tank, enter the third chemical oxidation tank for chemical treatment, adjust pH = 4, enter the third neutralization adjustment tank, adjust the pH to 6 , and discharge after dehydration by the third centrifugal dehydrator. The invention overcomes the defects of high energy consumption and extremely high cost. The invention is friendly, and compared with the distillation method, the waste water treatment cost is low, the energy consumption is low, the COD removal rate is improved, and the problem that the dangerous mother liquor cannot be treated caused by the distillation method is avoided.
Description
technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method for recycled polyester production. Background technique [0002] Recycled polyester is usually depolymerized from waste polyester under certain reaction conditions to obtain basic monomers or oligomers of polyester, which are re-synthesized as raw materials for fibers. The wastewater produced in the production process is recycled polyester wastewater. [0003] The properties of recycled polyester production wastewater and virgin polyester production wastewater are very different, which are characterized by high concentration of organic matter in wastewater and almost zero biodegradability. [0004] Before the present invention is made, there is currently no better method for treating waste water from recycled polyester production. In reality, only the distillation method is adopted, the wastewater is passed through the distillation device, the disti...
Claims
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IPC IPC(8): C02F9/14C02F103/38
Inventor 何成达王丹
Owner YANGZHOU UNIV
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