Bleaching and dyeing wastewater treatment method with combination of advanced oxidation and ultrafiltration

Abstract

The invention relates to a bleaching and dyeing wastewater treatment method with the combination of advanced oxidation and ultrafiltration membrane separation. The bleaching and dyeing wastewater treatment method comprises four steps of pretreatment in an adjusting tank, primary advanced oxidation treatment, secondary advanced oxidation treatment and ultrafiltration membrane separation treatment. Bleaching and dyeing wastewater is collected into the adjusting tank and then enters a primary advanced oxidation tank after pH adjustment, ferrous iron and hydrogen peroxide are added for oxidation, the wastewater is oxidated and then flows into a sedimentation tank, supernate in the sedimentation tank flows into a secondary advanced oxidation tank, after the wastewater is further oxidated, a pH value is adjusted to 8.0, so as to remove iron ions and ferrous ions generated during advanced oxidation, and subsequently, the wastewater enters a rotary cross-flow type membrane separation device, so as to remove suspended matters and sediments from the wastewater and complete wastewater treatment. The method has the advantages of simple process flow, less investment, low energy consumption and simplicity and convenience in maintenance.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular, the combination of advanced oxidation and membrane separation technology is applied to sewage treatment, and in particular relates to a bleaching and dyeing wastewater treatment method combined with advanced oxidation and ultrafiltration. Background technique [0002] Before the 1980s, the biodegradability of bleaching and dyeing wastewater in my country was relatively high, and physicochemical treatment + biochemical treatment processes were generally adopted, and the wastewater could meet the discharge standard. However, with the development of the industry, a large number of complex and refractory organic substances such as various new dyes and new additives have entered the wastewater, making the bleaching and dyeing wastewater a high-concentration, refractory, toxic and harmful industrial wastewater, which is difficult to adopt traditional conventional biochemical treatment. Mee...

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Problems solved by technology

However, with the development of the industry, a large number of complex and refractory organic substances such as various new dyes and new additives have entered the wastewater, making the bleaching and dyeing wastewater a high-concentration, refractory, toxic and harmful industrial wastewater, which is difficult to adopt traditional conventional biochemical treatment. Meet environmental protection requirements

[0003] At present, there are some defects in the advanced treatment combination technology of printing and dyeing wastewater commonly used, which cannot meet the outlet of bleaching and dyeing wastewater. For example, a Chinese patent on a recycling process and equipment for printing and dyeing wastewater with high salinity and high chroma (CN201210289827.X) proposes the use of advanced oxidation +Sand filter combined process, but this method uses traditional sand filter to separate chemical sludge produced by advanced oxidation, which has low efficiency and complicated operation; Chinese patent (application number CN201010279908.2 for a printing and dyeing wastewater reuse process) uses advanced oxidation The combined process of +MBR+RO enables the printing and dyeing wastewater to be reused after treatment, but the MBR membrane bioreactor in this method has the following disadvantages: (1) The existing membrane technologies at home and abroad all use static hollow fiber type Membrane modules and plate-and-frame membrane modules rely on measures such as blower aeration to form cross-flow, high energy consumption, and membranes are prone to pollution; (2) Small-scale bleaching and dyeing factories lack specialized water treatment technicians, and biological methods are difficult to maintain in the long-term Stable operation

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