Closed type printing and dyeing waste water processing system

Abstract

The invention discloses a closed type printing and dyeing waste water processing system. The closed type printing and dyeing waste water processing system comprises a filter, a water storage pond, a regulating pond, a reaction pond, a quartz sand filter tank, an activated carbon filter tank, a suspended filler filter tank, a back flush room, an external automatic reagent adding machine, an air blower, a back flush pump and a clear water pond. The quartz sand filter tank, the activated carbon filter tank and the suspended filler filter tank are detachable filter tanks, and manual filler replacing and cleaning can be carried out. A programmable logic controller is adopted in the whole system to carry out operation, and automatic control of the on-off state of a water pump is achieved. The removal rate of suspended matter can reach 94.9 percent, the chroma removing rate can reach 92.1 percent, and the turbidity removing rate can reach 98.3 percent.

Description

Technical field [0001] The invention relates to a closed printing and dyeing wastewater treatment system, 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 environmental protection and energy saving (low carbon). The main problem of environmental protection is wastewater, and about 80% of textile wastewater comes from the printing and dyeing industry. Statistics show that in 2008, the textile industry's wastewater discharge was 2.3 billion tons, ranking third among all industries, accounting for 10.60% of the country's industrial wastewater discharge. The discharge of chemical oxygen demand (CODCr) in the wastewater discharged by the textile industry is 314,000 tons, ranking fourth in all industrial sectors and accounting for 7.76% of the CODCr of industrial wastewater in the country. The data is statistical data for enterprises above designated size, an...

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%

Images