A closed printing and dyeing wastewater treatment method

Abstract

The invention discloses a closed-type printing and dyeing wastewater processing method. Wastewater sequentially passes through a filter, a reservoir, a regulating reservoir, a reacting pool, a quartz sand filter pot, an activated carbon filter pot, a suspended filler filter pot, a back washing room, an external automatic reagent feeding machine, an air blower, a back washing pump and a clean-water reservoir. The quartz sand filter pot, the activated carbon filter pot and the suspended filler filter pot are detachable filter pots and capable of achieving manual filler changing and cleaning. According to the sanitary wastewater processed by the method, the removal rate of chemical oxygen demand is up to 97.8%, the removal rate of total azote is up to 96.9%, the removal rate of five-day biochemical oxygen demand is up to 96.4%, the removal rate of suspended solid is up to 95.9%, the removal rate of the chroma is up to 94.8%, and the removal rate of the turbidity is up to 98.2%.

Description

technical field [0001] The invention relates to a closed-type printing and dyeing wastewater treatment method, which belongs to the field of water treatment in environmental protection. Background technique [0002] One of the main obstacles to the development of the textile industry is the problem of environmental protection and energy saving (low carbon). The main problem of environmental protection is waste water, and about 80% of the textile waste water comes from the printing and dyeing industry. Statistics show that in 2008, the wastewater discharge of the textile industry was 2.3 billion tons, ranking third among all industrial sectors, accounting for 10.60% of the national industrial wastewater discharge. The chemical oxygen demand (CODCr) in the wastewater discharged from the textile industry was 314,000 tons, ranking fourth among all industries, accounting for 7.76% of the national industrial wastewater CODCr. The data are statistical data for enterprises above de...

AI Technical Summary

Problems solved by technology

[0003] There are many successful examples of wastewater treatment in printing and dyeing factories, but there are also many cases with poor results. The reasons are roughly as follows: (1) The printing and dyeing factories did not analyze the characteristics of their own wastewater (water quality, water quantity), and copied the experience of other factories. often not ideal

(2) The design specification of urban sewage treatment is used for printing and dyeing wastewater treatment, only changing some parameters, causing great losses

Especially in the early days, large-scale design institutes were responsible for centralized treatment of wastewater from large-scale printing and dyeing factories, but they did not have a deep understanding of the nature of printing and dyeing wastewater, causing great losses

(3) New technologies, new processes, and new agents are directly used in projects without pilot tests, causing many failures

(5) Improper actual operation technology and management technology, not properly adjusted according to the change of wastewater, are also the reasons for unstable operation

The traditional biological treatment process has been seriously challenged; the COD removal rate of traditional chemical precipitation and air flotation methods for this type of printing and dyeing wastewater is only about 30%

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