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Multi-medium biological aerated filter and method for treating traditional Chinese medicine decoction piece wastewater using same

A biological aerated filter and multi-media technology, applied in the field of water treatment, can solve problems such as difficult promotion, poor effect, substandard chroma, etc., to ensure the effect of biochemical treatment, prevent excessive loss of water head, and reduce pollutants load effect

Inactive Publication Date: 2017-06-27
NANJING POLYTECHNIC INSITUTE
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Problems solved by technology

However, the suspended solids in the waste water of traditional Chinese medicine decoction pieces are mainly lignin, whose specific gravity is small, and the treatment effect of coagulation sedimentation is not good; in this process, there is no denitrification process, and the total nitrogen in the effluent is difficult to reach the standard; UASB and SBR have different effects on color The removal effect is not obvious. Once the multi-media filter fails, the chromaticity of the effluent will not drop but rise; in addition, in this invention, the load of the multi-media filter on SS is relatively large, and the problem of hardening and clogging will quickly occur during operation. Equipment maintenance is difficult
[0008] "Application of biological aerated filter in the treatment of traditional Chinese medicine wastewater" (Xie Jieyun, Guangdong Chemical Industry, 2013, 40(1): 93-94) mentioned a process for treating wastewater from traditional Chinese medicine preparations, which uses flocculation and sedimentation—UASB - The method of aerobic tank-biological aerated filter, the COD treated by this method can meet the requirements of the "Water Pollution Discharge Standard for Traditional Chinese Medicine Pharmaceutical Industry" (GB21906-2008), but because there is no denitrification unit, the total nitrogen in the effluent is difficult The discharge reaches the standard, and since the biological aerated filter with only ceramsite filler is not strong for the removal of chroma, the chroma after this method is not up to the standard
[0009] "Application of IC+aerobic MBR+BAF combined process in the treatment of traditional Chinese medicine wastewater" (Xia Wenjing, Guangdong Chemical Industry, 2015, 42(10):128-129) mentioned that the combined process of "IC+aerobic MBR+BAF" can effectively remove Pollutants in traditional Chinese medicine extraction wastewater, the effluent water quality meets the requirements of the discharge limit of water pollutants for new enterprises in Table 2 of "GB21906-2008 Discharge Standard of Water Pollutants for Traditional Chinese Medicine Pharmaceutical Industry", but the IC reactor in this process requires COD to start The concentration reaches 6000-8000mg / L, while the COD in the wastewater of traditional Chinese medicine decoction pieces is mostly 3000-5000mg / L; in addition, because the MBR process is a membrane treatment process, although the treatment effect is guaranteed, the cost of initial investment and membrane maintenance is high, so it is not easy to promote

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  • Multi-medium biological aerated filter and method for treating traditional Chinese medicine decoction piece wastewater using same
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Effect test

Embodiment 1

[0063] A Chinese medicine decoction piece pharmaceutical factory in Jiangsu, which mainly produces hundreds of Chinese medicine decoction pieces such as Codonopsis, Salvia, Angelica, Gastrodia, Astragalus, Licorice, Chuanbei, etc. The discharge amount of production wastewater is 230m 3 / d—470m 3 / d, CODcr 357mg / L-2879mg / L in wastewater, BOD 5 Concentration 69mg / L-946mg / L, SS80mg / L-833mg / L, ammonia nitrogen 6.2mg / L-27mg / L, pH6.5-8.0.

[0064] The wastewater treatment process of the present invention is used for treatment, and the discharge volume is an average of 370m 3 / d, average CODcr in wastewater 725mg / L, BOD 5 The average concentration is 169mg / L, the average SS is 433mg / L, the average ammonia nitrogen is 17mg / L, and the pH is 6.5-8.0. First, it enters the middle grid to remove large suspended solids, and the grid slag is transported to the sludge thickening tank. The effluent enters the cyclone grit tank at a flow rate of 0.7m / s to remove gravel and inorganic salt particles. ...

Embodiment 2

[0070] A Chinese medicine decoction piece pharmaceutical factory, the average CODcr in the wastewater produced by the factory is 1870mg / L, BOD 5 The average concentration is 367mg / L, the average SS is 698mg / L, the average ammonia nitrogen is 20mg / L, and the pH is 8.0-9.0.

[0071] The wastewater treatment process of the present invention is used for treatment, and the production wastewater first enters the middle grille to remove large suspended solids. The effluent enters the cyclone grit chamber at a flow rate of 0.6m / s to remove gravel and inorganic salt particles. The hydraulic retention time is 39.2s. The sand is lifted every 2 days and the sand is transported to the sludge thickening tank. The effluent enters the vortex air flotation tank, firstly adjust the pH to 7.0 with hydrochloric acid, then add 40mg / L PAC, then add 10mg / L PAM, and the scum is transported to the sludge conveying pipe by the slag scraper. After the effluent enters the hydrolysis acidification tank, the ...

Embodiment 3

[0077] A Chinese medicine decoction piece pharmaceutical factory, the factory has an average production wastewater flow of 782m3 / d, an average wastewater CODcr of 2000mg / L, BOD 5 The average concentration is 567mg / L, the average SS is 800mg / L, the average ammonia nitrogen is 15mg / L, and the pH is 6.0-7.2.

[0078] The wastewater treatment process of the present invention is used for treatment, the production wastewater first enters the coarse grid to remove large suspended solids, and then passes through the middle grid to remove a part of solids of 10-30 mm. The effluent enters the cyclone grit chamber to remove gravel and inorganic salt particles. The hydraulic retention time is 41.2s, and the sand is lifted every 2 days. The effluent enters the vortex air flotation tank, without adjusting the pH, directly adding 30mg / L of PAC, and then adding 15mg / L of PAM, and the scum is transported to the sludge conveying pipe by the slag scraper. After the effluent enters the hydrolysis ac...

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Abstract

The invention relates to a multi-medium biological aerated filter and a method for treating traditional Chinese medicine decoction piece wastewater using the same in the technical field of water treatment. The multi-medium biological aerated filter is characterized in that in the direction perpendicular to the bottom of the filter, a back flush water outlet weir plate and a normal water outlet weir plate are arranged to sequentially divide the multi-medium biological aerated filter into a filter body, a back flush water outlet chamber and a normal water outlet chamber; in the direction parallel to the bottom of the filter, a primary filter screen, a primary filter plate, a secondary filter plate and a secondary filter screen are sequentially arranged in the water filtering direction to divide the filter body into a water inlet chamber, a suspension filler chamber, a biological ceramsite filter material chamber, an activated carbon filler chamber and a clear water layer; and the suspension filler chamber provides a space for growth and propagation of activated sludge, thereby ensuring that products generated after ozone oxidizes heterocyclic and aromatic organic matters can be sufficiently subjected to biodegradation. According to the traditional Chinese medicine decoction piece wastewater treatment process provided by the invention, grit and inorganic salt particles in wastewater can be effectively removed and cleaned, thereby ensuring effective removal of pollutants in the wastewater, reducing energy consumption, and lowering the cost.

Description

[0001] Invention Title: [0002] The invention belongs to the technical field of water treatment, and particularly relates to a multi-medium aerated biological filter and a method for treating waste water from traditional Chinese medicine pieces. [0003] Background technique: [0004] In the production process of Chinese medicine decoction pieces, various waste water will be generated during the processes of cleaning, washing, infiltration, cutting of green slices, soaking and boiling, and roasting. These wastewaters mainly contain water-soluble and insoluble substances: water-soluble substances are mainly sugars, organic acids, glycosides, anthraquinones, tannins, alkaloids, tannins, proteins, starches and their hydrolysates. The use of pesticides in the process of planting Chinese medicinal materials, the production wastewater also contains heterocyclic compounds such as organophosphorus, organophosphorus, phenol, pyridine, etc.; insoluble substances are mainly sediment, plant fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F9/14
CPCC02F1/001C02F1/5236C02F1/56C02F1/66C02F1/78C02F3/02C02F3/28C02F9/00C02F2001/007C02F2301/08Y02W10/10
Inventor 梁晶
Owner NANJING POLYTECHNIC INSITUTE
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