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Non-excess activated sludge discharged printing and dyeing wastewater processing equipment and operation method thereof

A printing and dyeing wastewater and residual activity technology, which is applied in water/sludge/sewage treatment, textile industry wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems such as difficult to treat biodegradable industrial wastewater, and improve biochemical sexual effect

Inactive Publication Date: 2008-03-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device is only suitable for the treatment of wastewater with good biodegradability such as dairy wastewater, bean product wastewater, restaurant wastewater, and urban sewage, and it is difficult to treat industrial wastewater with poor biodegradability

Method used

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  • Non-excess activated sludge discharged printing and dyeing wastewater processing equipment and operation method thereof
  • Non-excess activated sludge discharged printing and dyeing wastewater processing equipment and operation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] As shown in Figure 1, the start-up stage: the excess sludge retrieved from the urban sewage plant and a small amount of domestic wastewater are mixed in a ratio of 1:1 into the two-stage hydrolysis acidification reaction tank and the multi-stage oxidation reaction tank, and the MLSS in the control reactor is 4g / L. The reactor was started with a mixture of printing and dyeing wastewater and domestic wastewater with a COD of 1000mg / L. The rotation speed of the slow agitator 7 in the No. 1 hydrolysis acidification reactor 3 is 50 r / min. Keep the water temperature in the multi-stage contact oxidation tank at 20-25° C. and the pH at 6-9 during the whole operation process. After the effluent from the multi-stage contact oxidation tank settles in the solid-liquid separation sedimentation tank 6, the supernatant is discharged, and the remaining sludge at the bottom of the solid-liquid separation sedimentation tank is evenly distributed to each reaction tank. The average sludg...

Embodiment 2

[0040] The start-up phase is the same as Example 1.

[0041] As shown in Figure 1, the continuous operation stage: a small amount of residual sludge at the bottom of the solid-liquid separation sedimentation tank flows back along the return pipe 11 to the No. 1 hydrolysis and acidification reactor 3 and the No. 2 hydrolysis and acidification reactor 4. The sludge distribution ratio of No. 1 hydrolytic acidification reactor 3 and No. 2 hydrolytic acidification reactor 4 is 2:1. The rotation speed of the slow agitator 7 in the No. 1 hydrolysis acidification reactor 3 is 40r / min, and the rotation speed of the agitator 18 in the phosphorus removal tank 17 is 80r / min. Influent COD concentration control increased from 1200-1400mg / L to 3800-4500mg / L. Maintain the total HRT for 35h, the COD removal effect is shown in Table 2, and the COD removal rate is always higher than 94%. The effluent COD index meets the secondary standard of the Textile Dyeing and Finishing Industry Water Poll...

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Abstract

A printing and dyeing wastewater treatment device and operation method of no excess active sludge discharge belongs to the field of environment protection. The device consists of a regulating tank (1), an overhead tank (2), a NO. 1 hydrolyzing and acidification reactive tank (3), a NO. 2 hydrolyzing and acidification reactive tank (4), a dephosphorization tank (17), a multilevel contact oxidation tank (5) and a solid-liquid separation stillpot (6). A screw carrier of the multilevel contact oxidation tank forms an anaerobic and facultative space. The anaerobic and facultative space plus two-level hydrolyzing and acidification section before the aerobic tecchnics leads three different environment conditions of anaerobic, oxygen-poor and aerobic technics to alternately carry through simultaneously and various microbe groups like denitrifying bacteria and nitrobacteria can coexist in the same sludge system. The goal of effective dephosphorization is reached by strengthening the phosphorus releasing action of the anaerobic section phosphorus-accumulating bacteria through the operation mode of two-level hydrolyzing and acidification and adding chemical phosphate removing agent in the dephosphorization tank. The present invention has the advantages of simple technics, low operation cost, effective dephosphorization, high anti-impact load capacity, convenient operation and management and no excess active sludge discharge.

Description

Technical field: [0001] The invention belongs to the field of environmental protection, and in particular relates to a device for treating printing and dyeing wastewater by hydrolysis in a hydrolysis acidification section and a predation effect of microorganisms in a food chain and a use method. Background technique: [0002] The printing and dyeing industry occupies an important position in my country's national economy, but the treatment of printing and dyeing wastewater has always been a difficult problem in front of the environmental protection interface. According to incomplete statistics, the national printing and dyeing industry discharges about 0.6×10 wastewater per year. 9 m 3 , and most of them failed to achieve stable emission standards. [0003] Biological methods are still the main method for the treatment of printing and dyeing wastewater at home and abroad. Due to the progress of the textile dyeing and finishing process in recent years, a large amount of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/08C02F1/52C02F103/30
CPCY02W10/10
Inventor 汪群慧李黎杰谢维民菊池隆重石原和美
Owner UNIV OF SCI & TECH BEIJING
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