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Low-concentration fluorine-containing wastewater deep fluorine removal treatment technology and fluorine removal treatment system

A fluorine treatment, low-concentration technology, which is applied in the field of deep defluorination treatment process and defluorination treatment system for low-concentration fluorine-containing wastewater, can solve the problem of inability to achieve deep removal of fluoride in wastewater, and achieves reduced dosage and broad application. The prospect, the effect of improving the removal efficiency

Pending Publication Date: 2019-11-05
山东省资源环境建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wastewater treatment with high fluoride concentration, calcium salt precipitation method can be used to add calcium hydroxide or calcium chloride to the wastewater to convert fluoride into calcium fluoride precipitate and remove it, but it is limited to the concentration of fluoride Solubility problem, when the fluoride content in the wastewater is lower than 10mg / L, the calcium salt precipitation method cannot realize the deep removal of fluoride in the wastewater

Method used

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  • Low-concentration fluorine-containing wastewater deep fluorine removal treatment technology and fluorine removal treatment system
  • Low-concentration fluorine-containing wastewater deep fluorine removal treatment technology and fluorine removal treatment system
  • Low-concentration fluorine-containing wastewater deep fluorine removal treatment technology and fluorine removal treatment system

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Experimental program
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Effect test

Embodiment 1

[0039] A deep fluoride removal treatment system for fluorine-containing wastewater, such as figure 1 As shown, the system includes:

[0040] Regulating tank 1, lifting pump 2, mixing reactor 3, pre-reaction tank 4, intermediate reaction tank 5, complexation reaction tank 6, flocculation reaction tank 7, sedimentation tank 8, drainage tank 9, return water pump 10, sludge return pump 11. Sludge pump 12, sludge dehydration system 13, fluorine removal agent dosing system 14, coagulant aid dosing system 15; the regulating tank 1, lift pump 2, mixing reactor 3, pre-reaction tank 4, middle The reaction tank 5, the complexation reaction tank 6, the flocculation reaction tank 7, the sedimentation tank 8, and the drainage tank 9 are connected through the delivery pipeline in turn; the regulating tank 1 is connected with the inlet of the lift pump 2 through the delivery pipeline; The mixing reactor 3 is connected through a delivery pipeline; the defluorination agent dosing system 14 is ...

Embodiment 2

[0043] This embodiment determines the relationship between the sludge return flow rate and the removal rate of free fluoride by experiment:

[0044] Effect of different sludge return flow rate on the removal of free fluoride in wastewater Set the waste water flow rate as Q, then the sludge return flow rate is 0.01-0.05Q, and the waste water with free fluoride content of 9.5mg / L and hardness of 350mg / L As a water sample, the sedimentation sludge reflux was mixed with the water sample, reacted for 10 minutes under the condition of stirring speed of 25r / min, filtered after the reaction, and the content of free fluoride in the filtrate was measured. The effect of different sludge reflux on the free fluoride in wastewater The results of the removal are shown in Table 1:

[0045] Table 1

[0046] Sludge return flow Free fluoride removal rate% 0.01Q 5 0.02Q 15 0.03Q 25 0.04Q 26 0.05Q 27

[0047] It can be seen from the above experiments that...

Embodiment 3

[0049] The influence of the concentration of free fluoride in the wastewater system on the reaction efficiency of fluoride removal agents:

[0050] The inventor found by accident during the actual research process that when the concentration of free fluoride in the wastewater is higher than 4.5 mg / L, the amount of defluoridation agent consumed will increase significantly when the unit concentration of free fluoride is reduced. For water with medium and low concentrations of fluoride, adjusting the concentration of free fluoride in the reaction wastewater system to below 4.5mg / L can effectively improve the reaction efficiency of fluoride removal agents, reduce the amount of fluoride removal chemicals and reduce the cost of fluoride removal.

[0051] Dilute the fluorine-containing wastewater with a free fluoride concentration of 6.0 mg / L after the treatment in Example 2, respectively, to obtain free fluoride concentrations of 6.0 mg / L, 5.5 mg / L, 5.0 mg / L, and 4.5 mg / L, 4.0mg / L,...

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Abstract

The invention relates to a low-concentration fluorine-containing wastewater deep fluorine removal treatment technology and a fluorine removal treatment system. Mainly, further deep fluorine removal isconducted on wastewater with the free-state fluoride concentration being lower than 10 mg / L. The fluorine removal treatment technology mainly includes the steps of conducting mixing reaction on sludge and the wastewater to reduce the content of fluorides in the wastewater, and reducing the free-state fluoride concentration in a mixed wastewater system to 4.5 mg / L or below and meanwhile reducing the free-state fluoride concentration to 1.0 mg / L through dilution water before a fluorine removal agent is added. The reaction efficiency of the fluorine removal agent can be effectively improved, andthe consumption of the fluorine removal agent is reduced.

Description

technical field [0001] The invention relates to a deep defluorination treatment process and a defluorination treatment system for low-concentration fluorine-containing wastewater, and belongs to the technical field of fluoride-containing wastewater treatment. Background technique [0002] Fluorine is one of the trace elements necessary for human life activities. The World Health Organization (WHO) stipulates that the appropriate concentration of fluoride in drinking water is 0.5mg / L-1.0mg / L. Both excess and deficiency are harmful to human health. Excessive fluoride can lead to fluorosis, manifested as systemic chronic damage mainly invading teeth and bones; fluorine is an accumulative poison, and plant leaves and grass can absorb fluorine. After planting contaminated forage, it will cause joint swelling, osteoporosis, and even paralysis. [0003] Fluorine in nature is mostly in a compound state, mainly including: fluorspar, fluorapatite, etc. They are all important chemica...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14
CPCC02F9/00C02F2101/14C02F1/52C02F1/56C02F1/66Y02W10/37
Inventor 洪卫庄会栋郎咏梅张增国梁世华洪光波李华于长伟金晓佩陈慧慧张琨梁高选李宾宾王朝丽郭铭
Owner 山东省资源环境建设集团有限公司
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