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Chemical fiber printing alkali reducing quantity waste water resources pretreatment method

A technology of alkali reduction wastewater and resource utilization, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the difficulty of chemical fiber printing and dyeing alkali reduction wastewater treatment, and the investment and cost Deal with problems such as high cost and inability to meet the discharge standards stably, and achieve the effects of small footprint, reduced treatment costs, and low waste water treatment costs

Inactive Publication Date: 2005-03-09
杭州国泰环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly solves the problems in the prior art that the treatment of chemical fiber printing and dyeing alkali reduction wastewater is difficult, the investment and treatment costs are high, resources are wasted, and discharge cannot be stably met the standard.

Method used

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  • Chemical fiber printing alkali reducing quantity waste water resources pretreatment method
  • Chemical fiber printing alkali reducing quantity waste water resources pretreatment method
  • Chemical fiber printing alkali reducing quantity waste water resources pretreatment method

Examples

Experimental program
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Embodiment 1

[0017] Example 1: Alkali reduction wastewater treatment of a chemical fiber printing and dyeing enterprise, the wastewater treatment scale is 1500t / d, and the process flow is as follows figure 2 As shown, the alkali reduction wastewater produced by the dyeing vat 1, the intermittent alkali weight reduction machine 2, and the continuous alkali weight reduction machine 3 are firstly collected into the middle tank 4, and the volume of the middle tank 4 is 2 to 20m 3 , the number can be set multiple according to the size of the enterprise and the convenience of fragmented collection. This embodiment has not been connected to the alkali reduction waste water in the dyeing vat. The waste water is transported to the pretreatment storage tank 6 through the pump 5. The CODcr concentration in the waste water is 23660mg / l, and the pH value is 12.5. Because this part of the waste water is alkaline, an alkali-resistant pump and pipeline must be selected. A tee is established between the ...

Embodiment 2

[0019] Example 2: A chemical fiber fabric printing and dyeing company is mainly engaged in the printing and dyeing of chemical fiber fabrics, with an annual processing capacity of 120 million meters. There are 12 intermittent alkali weight reduction machines and 1 continuous alkali weight reduction machine. The daily discharge of high-concentration alkali weight reduction Wastewater about 1000m 3 . Reaction tank volume 25m 3 ×4 units, equipped with 60m 2 2 sets of polypropylene plate and frame filter presses, the storage tank is a concrete high level pool of 400m 3 (Using the original wastewater pool), the daily processing capacity of alkali reduction wastewater is 1000m 3 . Using the chemical fiber printing and dyeing alkali weight reduction wastewater resource pretreatment process flow of the present invention (such as figure 1 shown), use 30% sulfuric acid to adjust the pH value of the wastewater to 2.5-5.0, (if the pH value> 5.0, the precipitation is not complete), th...

Embodiment 3

[0022] Example 3: A group company engaged in printing and dyeing of chemical fiber and cotton cloth has 40 intermittent alkali weight reduction machines and one continuous alkali weight reduction machine, and discharges 1,500-2,000 tons of alkali weight reduction waste water per day. Processing device is located 500m 3 One storage tank, 25m 3 There are 6 reaction tanks and 2 plate and frame filter presses, with a daily processing capacity of 1500t / d. Adopt technological process described in the present invention (as figure 1 shown). Use 25% sulfuric acid to adjust the pH value of the wastewater to 2.5-5, add the flocculant to 3-50ppm, and keep stirring for 15-45min. The comparison of water quality analysis results before and after pretreatment of alkali reduction wastewater is shown in Table 3.

[0023] indicators

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Abstract

A pretreating process or reclaiming the sewage generated by printing and dyeing chemical fibres includes such steps as using acid to regulate pH=2.5-5.0, adding flocculant, stirring, and solid-liquid separating. The process can remove 75-90% CODcr in sewage.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a resource-based pretreatment method for alkali-reduction wastewater in the printing and dyeing process of chemical fiber fabrics. Background technique [0002] Alkali weight reduction is a new production process adopted by the printing and dyeing industry in the past ten years to improve the comfort, softness and other wearing properties of chemical fiber fabrics. The so-called alkali reduction process is to treat the chemical fiber (polyester) fabric with alkali (NaOH), and degrade and hydrolyze the surface layer polyethylene terephthalate (PET) of the chemical fiber fabric at a higher temperature, so that the fabric Reduces weight and softens with a silky texture. However, alkali reduction waste water is produced during the production process of alkali reduction, and its main components are hydrolysis products of chemical fiber fabric PET: disodium terephthalate, ethylene glyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/04
Inventor 陈柏校
Owner 杭州国泰环保科技股份有限公司
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