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A kind of heavy metal wastewater treatment method

A technology for wastewater treatment and heavy metals, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Stability, large stirring power consumption, etc., to achieve good reactivity and reusability, improve reusability, and reduce reaction energy consumption.

Active Publication Date: 2021-10-29
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of zero-valent iron is active, and it is easy to react with the surrounding medium to form a passivation layer on the particle surface, which seriously hinders the contact reaction between zero-valent iron and pollutants.
In addition, the currently used fluidized bed reactor has defects such as large consumption of stirring power, easy accumulation of iron powder and serious compaction, and unstable distribution of zero-valent iron in the reactor, resulting in poor treatment effect.

Method used

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  • A kind of heavy metal wastewater treatment method
  • A kind of heavy metal wastewater treatment method
  • A kind of heavy metal wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, this embodiment provides a heavy metal wastewater treatment reactor, the reactor has a shell 1, a packing area and a sedimentation area are arranged inside the shell 1, and the packing area includes at least two packing layers 2 arranged at intervals up and down, The settling zone is set below the filling zone.

[0048] The reactor shell 1 can be set in a cylindrical shape, and at this time, its cross-sectional shape is circular. There is no strict limit on the number of stages for the packing layer 2 in the housing 1, and it can be set to 2-4 stages, and the packing layer 2 can be a sponge layer. An arc top 3 is arranged between adjacent packing layers 2, and its cross-sectional shape is a circular arc. The central angle of the arc is 90-120°, and the chord length is the diameter of the shell 1; A plurality of through holes, the diameter of the through holes is 0.4-0.6mm. In this embodiment, the height of the filling area is set to 1 / 3 to ...

Embodiment 2

[0053] In this embodiment, the heavy metal wastewater treatment reactor of Example 1 is used for treatment, and a small reactor for treating 1.25 L of heavy metal wastewater per hour is taken as an example for illustration.

[0054] 1. Filler activation

[0055] 100 g of biochar and 100 g of iron powder were filled into the packing layer of the reactor, and NaNO was continuously added dropwise to the upper part of the reactor at a rate of 12 mL / h. 3 with FeSO 4 Mixed solution, NaNO in mixed solution 3 , FeSO 4 The concentration of both was 30mg / L, and the continuous dropwise addition was continued for 24 hours to prepare the activated zero-valent iron mixed material.

[0056] 2. Prepare simulated heavy metal mixed solution

[0057] Prepare a simulated heavy metal mixed solution containing copper, manganese, arsenic, selenium, lead, cadmium, mercury, and chromium ions: pipette 4 mL of 1000 mg / L copper standard stock solution, 20 mL of 1000 mg / L manganese standard stock solu...

Embodiment 3

[0064] The treatment method of the present embodiment is with reference to embodiment 2, and wherein simulated heavy metal mixed solution copper ion initial concentration is 4mg / L, and manganese ion initial concentration is 20 mg / L, and arsenic, selenium, lead, cadmium, mercury and chromium ion initial concentration are all It is 2 mg / L.

[0065] The simulated heavy metal mixed solution was continuously pumped into the upper part of the reactor at a rate of 7.5 L / h, 3.75 L / h and 1.25 L / h, and FeSO was continuously added dropwise to the reactor at a rate of 12 mL / h. 4 and FeCl 3 The mixed solution, FeSO in the mixed solution 4 , FeCl 3 The concentration is 30mg / L.

[0066] Samples were taken from the lower part of the reactor at regular intervals, and the concentration of metal ions in the filtrate was detected.

[0067] Table 1 The detected concentration of each pollutant in the effluent of the reactor at different hydraulic retention times

[0068]

[0069] The result...

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Abstract

The invention provides a method for treating heavy metal wastewater. The method of the present invention utilizes a reactor with a packing layer for processing, and the processing method includes the following steps: A) filling zero-valent iron and carbon materials in the packing layer of the reactor, and then adding an activator for activation; wherein, the activator is selected from At least one of iron salt, sodium nitrate and potassium peroxymonosulfate; B) Send heavy metal wastewater into the reactor for treatment. During treatment, heavy metal wastewater flows through the packing layer from top to bottom, and iron is added to the packing layer at the same time Salt. The present invention activates the filling material so that the activated filling has good reactivity and reusability; the reaction and separation are carried out by using the gravity of the fluid, which not only reduces the energy consumption of the reaction, but also improves the treatment effect; the method can treat heavy metals A variety of heavy metal pollutants including copper, cadmium, chromium, lead, arsenic, selenium, mercury, etc. in wastewater are efficiently removed, with a removal rate of over 99.9%.

Description

technical field [0001] The invention relates to the technical field of heavy metal wastewater treatment, in particular to a heavy metal wastewater treatment method. Background technique [0002] In recent years, with the development of industry and the increase of human activities, a large amount of industrial wastewater and urban domestic sewage containing heavy metal pollutants have been discharged into rivers and lakes. Heavy metal wastewater pollution has the characteristics of long-term toxic effects and non-biodegradable properties. It can enter the human body through the food chain and accumulate in the human body, leading to various diseases and dysfunction, and ultimately causing serious harm to human health. [0003] Traditional heavy metal wastewater treatment methods mainly include chemical precipitation method, ion exchange method, evaporation concentration method, membrane separation method and so on. The chemical precipitation method (commonly known as the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22C02F101/30
CPCC02F1/52C02F1/5236C02F1/705C02F9/00C02F2001/007C02F2101/20C02F2101/22C02F2101/30
Inventor 刘海洋杨言徐乐瑾曹书涛杨芳蒋晨晨谷小兵田晓曼武旭升王慧卿
Owner DATANG ENVIRONMENT IND GRP
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