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Novel process for treating tea deep processing industrial wastewater

A technology for wastewater treatment and deep processing, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, general water supply conservation, etc. Small, reduce water consumption, reduce the effect of chroma

Inactive Publication Date: 2015-02-18
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical purpose of the present invention is to provide a two-phase anaerobic reactor and membrane for the current single treatment technology that cannot meet the requirements of the national sewage discharge standard and does not have a complete set of combined treatment process to treat the wastewater in the tea deep processing process. Integrated technology combined with treatment process to treat the wastewater generated in the tea deep processing process, and the treated wastewater can meet the requirements of factory reuse

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  • Novel process for treating tea deep processing industrial wastewater

Examples

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Effect test

example 1

[0034] Example 1. Production wastewater from a tea polyphenols manufacturing plant

[0035] The tea polyphenol wastewater mainly comes from tea cleaning and solvent recovery process. These two kinds of wastewater are transported to the pretreatment tank 1. The temperature of the wastewater is 50~60℃, the content of tea polyphenols is 43.7%, the COD is 28000mg / L, and the SS is 11800mg / L, the chromaticity is 827 times. The waste water is cooled to 30-40°C in the pretreatment tank 1, the pH is adjusted to 5-8, and 500 mg / L polyaluminum chloride and 30 mg / L polyacrylamide are added for flocculation.

[0036]The supernatant after pretreatment and precipitation is sent to the acid production reactor 3 through the centrifugal pump 2, and the pH value of the production reactor 3 is controlled to be 4.2~5.5 (controlled by the pH detector 4); the effluent after the reaction flows into the acid production reactor automatically In the reactor 7, the pH is controlled at 6.5~7.3, and the ...

Embodiment 2

[0039] Compared with Example 1, the only difference is that in step (1) of this example, the flocculant is polyaluminum chloride, and the addition amount is 600 mg / L, and the coagulant aid is polyacrylamide, and the addition amount is 50 mg / L . During the pretreatment process, the temperature was controlled at 35°C, and the pH was controlled at 10 using a pH regulator.

[0040] In step (2), the pH in the acid generating reactor 3 is controlled to be 6, the pH of the methanogenic reactor 7 is controlled to be 10, and the temperature is 40°C. Influent COD load is 3.0kg / m 3 d, the hydraulic retention time of the acid generating reactor 3 is 24h, and the hydraulic retention time of the methanogenic reactor 7 is 4d.

[0041] In the integrated treatment device of ultrafiltration, nanofiltration and reverse osmosis membrane in step (3), the cross-flow velocity of the ultrafiltration membrane for filtering sewage is 1~7m / s, and the operating pressure is 0.5MPa; the operating pressur...

Embodiment 3

[0044] Compared with Example 1, the only difference is that in step (1) of this example, the flocculant is polyferric sulfate, and the addition amount is 200 mg / L, and the coagulation aid is activated silicic acid, and the addition amount is 10 mg / L. During the pretreatment process, the temperature was controlled at 35°C, and the pH was controlled at 4 using a pH regulator.

[0045] In step (2), the pH in the acid generating reactor 3 is controlled to be 4, the pH of the methanogenic reactor 7 is controlled to be 6, and the temperature is 30°C. Influent COD load is 1.0kg / m 3 d, the hydraulic retention time of the acid generating reactor 3 is 12h, and the hydraulic retention time of the methanogenic reactor 7 is 1d.

[0046] In the integrated treatment device of ultrafiltration, nanofiltration and reverse osmosis membrane in step (3), the cross-flow velocity of the ultrafiltration membrane for filtering sewage is 1m / s, and the operating pressure is 0.1MPa; the operating pressu...

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Abstract

The invention relates to a new technology for treating wastewater from deep processing of tea, and belongs to the technical field of environmental protection. The treatment process includes five steps: flocculation pretreatment, two-phase anaerobic reactor treatment, membrane integrated treatment system treatment, sludge treatment, and concentrate treatment. The use of this process has achieved high COD degradation of high-concentration organic wastewater, reduction of high SS, and the permeate has reached the recycling indicator. The advantage of this invention is that for the first time, a combined treatment process is used to treat tea deep processing wastewater. After the wastewater is treated, the removal rate of organic matter and suspended solids is as high as 99%, the desalination rate is as high as 98%, and the effluent water quality is colorless, clear and odorless. This process can efficiently and quickly treat the wastewater generated during the deep processing of tea, realize the recycling of such industrial wastewater, and provide a feasible experimental plan for other wastewater treatment.

Description

technical field [0001] The invention relates to a new process for treating wastewater in the tea deep processing industry, in particular to using a combined process of two-phase anaerobic reactor and membrane integration technology to realize the treatment of wastewater in the tea deep processing process and reuse the treated water. The invention belongs to the technical field of high-soluble organic wastewater treatment. Background technique [0002] Tea is a rich natural plant resource in my country. Tea has nearly 500 kinds of chemical components, including more than 450 kinds of organic compounds, rich in polyphenols, sugars, proteins and caffeine, multivitamins, inorganic elements, trace elements Among them, the most beneficial substances to human health are tea polyphenols. Tea polyphenols, also known as tea tannins and tea tannins, are a mixture of polyhydric phenol derivatives isolated from natural tea leaves, mainly including Catechin, flavonoids, anthocyanins, and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCY02A20/131
Inventor 姚忠仲兆祥陈斌熊晓辉
Owner NANJING TECH UNIV
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