Method for processing polyurethane (PU) synthetic leather wastewater

A synthetic leather and polyurethane technology, applied in natural water treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of low efficiency of anaerobic biological treatment, achieve low removal efficiency and improve biodegradability Effect

Inactive Publication Date: 2016-09-14
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the problem that there is no particularly effective treatment process for PU synthetic leather wastewater in the prior art, the present invention provides a method for treating polyurethane (PU) synthetic leather wastewater. With the characteristi...

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  • Method for processing polyurethane (PU) synthetic leather wastewater
  • Method for processing polyurethane (PU) synthetic leather wastewater
  • Method for processing polyurethane (PU) synthetic leather wastewater

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Embodiment 1

[0036] Such as figure 1 As shown, this embodiment adopts a method for treating polyurethane (PU) synthetic leather wastewater (combined process of electrocatalytic flocculation + gradient anaerobic + MBBR) to treat PU synthetic leather wastewater of a domestic company, and achieves a better Treatment effect, the operating parameters of each unit process in the integrated process are as follows:

[0037] (1) Conduct electrocatalytic flocculation pretreatment of PU synthetic leather wastewater from a domestic company, using SnO 2 RuO 2 / Ti is the anode material, the voltage is 8V, the electrocatalytic flocculation time is 30min. After treatment, the PU synthetic leather wastewater after electrocatalytic flocculation is introduced into the wastewater conditioning tank with agitating device, and it is compared with the previous conditioning tank under the agitation and water turbulence. The intermediate wastewater achieves a balanced water quality and a stable water volume adjustment ...

Embodiment 2

[0048] In this embodiment, a method for treating PU synthetic leather wastewater (combined process of electrocatalytic flocculation + gradient anaerobic + MBBR) is used to treat PU synthetic leather wastewater of a domestic company, which achieves a better treatment effect and an integrated process The operating parameters of each unit process are as follows:

[0049] (1) Conduct electrocatalytic flocculation pretreatment of PU synthetic leather wastewater from a domestic company, using SnO 2 RuO 2 / Ti is the anode material, the voltage is 15V, and the electrocatalytic flocculation time is 5min. After treatment, the synthetic leather wastewater after electrocatalytic flocculation is introduced into the wastewater regulating tank with agitating device;

[0050] (2) Use a pump to pump the waste water in the regulating tank in step (1) into the gradient anaerobic reactor. The gradient anaerobic reactor is an integrated anaerobic reactor with four-stage partitions, and its average organ...

Embodiment 3

[0057] In this embodiment, a method for treating PU synthetic leather wastewater (combined process of electrocatalytic flocculation + gradient anaerobic + MBBR) is used to treat PU synthetic leather wastewater of a domestic company, which achieves a better treatment effect and an integrated process The operating parameters of each unit process are as follows:

[0058] (1) Conduct electrocatalytic flocculation pretreatment of PU synthetic leather wastewater from a domestic company, using SnO 2 RuO 2 / Ti is the anode material, the voltage is 12V, and the electrocatalytic flocculation time is 25min. After treatment, the synthetic leather wastewater after electrocatalytic flocculation is introduced into the wastewater regulating tank with agitating device;

[0059] (2) Use a pump to pump the wastewater in the regulating tank in step (1) into the gradient anaerobic reactor. The gradient anaerobic reactor is an integrated anaerobic reactor with 4 levels of partitions, and its average orga...

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Abstract

The invention discloses a method for processing polyurethane (PU) synthetic leather wastewater, and belongs to the technical field of wastewater processing. The method includes the steps of preprocessing high-concentration PU synthetic leather wastewater through electrocatalysis flocculation so as to decompose part of large-molecular organic matter in wastewater and improve biodegradability of wastewater, conducting efficient gradient anaerobic reaction processing on the PU synthetic leather wastewater preprocessed through electrocatalysis flocculation, conducting multi-stage and multi-step anaerobic decomposition on high-concentration organic matter in a gradient anaerobic reaction zone, and conducting thorough aerobic biochemical degradation on anaerobic output water through MBBR so as to achieve the effective degradation and up-to-standard discharge of high-concentration synthetic leather wastewater. A reactor related to the method is compact in structure, small in occupied area, high in process integrity, stable in running and low in processing cost.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically, relates to a method for treating polyurethane (PU) synthetic leather wastewater. Background technique [0002] Polyurethane synthetic leather needs to go through a variety of complex physical and chemical processes such as water soaking, liming and dehairing, deliming, tanning, and dyeing. A large amount of chemical materials are used. Except for a small part of which is absorbed, most of them enter the wastewater. It causes pollution to human body, soil, animal and plant growth. The most harmful substance is dimethylformamide (DMF). DMF chemical formula (CH 3 ) 2 NHCHO is chemically stable and toxic. The recommended maximum allowable mass concentration in surface water in my country is 25mg / L. DMF is only used as an organic solvent in the production of PU synthetic leather and does not participate in the chemical reaction process of the tanning process. Therefore,...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/38C02F101/30
CPCC02F1/46109C02F1/463C02F3/085C02F3/108C02F3/286C02F3/30C02F9/00C02F2001/46142C02F2101/30C02F2103/38C02F2209/08
Inventor 王庆丁原红张瑞任洪强钱翌
Owner QINGDAO UNIV OF SCI & TECH
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