A method for advanced treatment of printing and dyeing chemical comprehensive wastewater

Abstract

The invention discloses a method for deep treatment of printing and dyeing chemical comprehensive wastewater. The method is characterized by comprising the following steps: adding multi-metal solid catalytic filler to activated sludge obtained after mixing and domesticating secondary biochemical effluent of printing and dyeing chemical wastewater so as to form multi-metal catalytic biological carbon filler; then stopping aerating, and decanting so as to obtain a reaction mixed liquid, adding lime, rapidly mixing, adding aluminum sulfate, rapidly mixing firstly and then stirring slowly, and carrying out solid-liquid separation so as to obtain supernatant; when the water quality of the supernatant fails to reach a standard, adding the multi-metal catalytic biological carbon filler to the supernatant once again and repeating the steps for multiple stages of reaction, and discharging the supernatant with water quality meeting the standard. Through the synergistic effect of multi-metal catalytic reduction, activated coke adsorption and microorganism degradation, organic matters can be further removed, so as to achieve the efficient removal of effluent organic matters, ammonia nitrogen and suspended solids, and to meet the requirements of effluent upgrading and reconstruction.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution treatment, and in particular relates to a technical method for advanced treatment of printing and dyeing chemical wastewater. Background technique [0002] With the improvement of national energy conservation and emission reduction requirements, the emission standards of organic matter (COD) in printing and dyeing and chemical wastewater have generally increased. Among them, the standard of direct wastewater discharge body is raised to the first-class B (COD<60mg / L) or first-class A standard (COD<50mg / L), and the ammonia nitrogen effluent reaches the first-class A standard (NH 4 + -N<5mg / L). However, the existing printing and dyeing and chemical wastewater treatment process only includes conventional physicochemical + secondary biochemical, and this process can only degrade COD to 140mg / L under the best operating conditions (China Water and Wastewater, 2011, 27 (15) 32- ...

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Problems solved by technology

However, these technologies have defects such as high investment and operating costs, difficult management, and unstable effects in engineering applications.

Such as internal electrolytic catalysis and Fenton pretreatment agent and filler expense consumption rate is fast, and the cost is expensive (CN103204595B); Ozonation method is generally used in feedwater advanced treatment, and its equipment investment such as ozone generation and oxygen production is high, and operation management difficulty is big ( CN101700927B); Membrane separation technology includes techniques such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis, wherein although reverse osmosis and nanofiltration can obtain good results, there are high investment and operating costs, serious membrane pollution and difficult treatment of concentrate and other problems, it is difficult to apply in large-scale centralized sewage treatment plants, and ultrafiltration and microfiltration are difficult to obtain satisfactory treatment effects due to their limited interception precision (CN101250011A, CN101774733A)

Activated carbon adsorption is a mature and effective technology, but the high cost of regeneration after adsorption saturation has become the biggest limiting factor in engineering applications (CN102633394B)

In response to the requirements of printing and dyeing and chemical wastewater discharge standards, so far, no treatment method has been found in the literature, invention patents and engineering cases that is low in cost, stable in operation, and can achieve advanced treatment of organic matter and meet the discharge standards

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