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Wastewater treatment process based on the combination of supermagnetic separation and microwave energy technology

A technology of wastewater treatment and microwave energy, which is applied in the direction of neutralization water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of poor removal efficiency of heavy metals, inability to remove cyanide, and insufficient separation. Achieve the effect of reducing precipitation residence time, reducing oxidation reaction time, and facilitating subsequent treatment

Inactive Publication Date: 2018-11-23
航天圣诺(北京)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most wastewater contains substances such as cyanide, chromium and nickel, which are highly toxic and difficult to biochemically treat
[0003] At present, the common treatment method for wastewater in China is the chemical precipitation method, mainly by adding NaOH or Na 2 S converts heavy metal ions into their hydroxide or sulfide precipitates, but ordinary flocculation and sedimentation takes a long time and requires a larger sedimentation tank, otherwise the separation is not sufficient, resulting in poor removal efficiency of heavy metals and making wastewater very Difficult to meet emission standards
Moreover, the simple flocculation and sedimentation process cannot remove cyanide and COD and other components in the wastewater, and often requires additional biochemical processes, resulting in a large area of ​​the entire wastewater treatment process and low treatment efficiency.

Method used

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  • Wastewater treatment process based on the combination of supermagnetic separation and microwave energy technology
  • Wastewater treatment process based on the combination of supermagnetic separation and microwave energy technology
  • Wastewater treatment process based on the combination of supermagnetic separation and microwave energy technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A battery factory in Ningbo, Zhejiang, produces 500 tons of wastewater per day, and the indicators of influent water quality are shown in Table 1:

[0034] Table 1

[0035]

[0036] The treatment process is as follows:

[0037] S101. The wastewater generated by each unit of the electroplating production line is collected in a centralized manner and sent to the regulating pool for unified treatment.

[0038] S102. Add ferrous sulfate to the waste water as a reducing agent, and adjust the ORP to 150-250. The amount of the reducing agent added is 0.15% of the waste water by mass percentage, and the reaction time is 15 minutes to obtain the mixture A1.

[0039] Ferrous sulfate reacts as a reducing agent, and the reaction formula is:

[0040] 3Fe 2+ +Cr 6+ →3Fe 3+ +Cr 3+

[0041] S103. After adding nano-magnetic seed powder to the mixed solution A1, adjust the pH value to 7-8, add polyaluminum chloride as a flocculant and polyacrylamide as a coagulant, and carry out ...

Embodiment 2

[0059] In a battery factory in Ningbo, Zhejiang Province, the production wastewater is 500 tons / day, and the indicators of influent water quality are shown in Table 1 in Example 1:

[0060] The treatment process is as follows:

[0061] S201. The wastewater generated by each unit of the electroplating production line is collected in a centralized manner and sent to the regulating pool for unified treatment.

[0062] S202. Add sodium metabisulfite as a reducing agent to the waste water, and adjust the ORP to 150-250. The amount of the reducing agent added is 0.10% of the waste water by mass percentage, and the mixture A2 is obtained after a reaction time of 10 minutes.

[0063] Sodium metabisulfite reacts as a reducing agent, and the reaction formula is:

[0064] S 2 o 5 2- +H 2 O→2HSO 3 -

[0065] 2HSO 3 - →2SO 3 2- +2H +

[0066] 6SO 3 2- +4Cr 6+ +6OH - →6SO 4 2- +4Cr 3+ +3H 2 o

[0067] S203. After adding the nano-magnetic seed powder to the mixed solut...

Embodiment 3

[0079] In a battery factory in Ningbo, Zhejiang Province, the production wastewater is 500 tons / day, and the indicators of influent water quality are shown in Table 1 in Example 1:

[0080] The treatment process is as follows:

[0081] S301. The wastewater generated by each unit of the electroplating production line is collected in a centralized manner and sent to the regulating pool for unified treatment.

[0082] S302. Add a mixture of sodium metabisulfite and ferrous sulfate to the wastewater as a reducing agent, the mass ratio of the two is 1:1, and adjust the ORP to 150-250. The amount of the reducing agent added is 0.125% of the wastewater in mass percent %, mixture A3 was obtained after 30 minutes of reaction time.

[0083] S303. After adding nano-magnetic seed powder to the mixed solution A3, adjust the pH value to 7-8, add ferric chloride as a flocculant and polyamine salt as a coagulant, and then carry out flocculation and sedimentation. The reaction time is 60 minu...

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Abstract

The invention provides an effluent treatment technology and system based on combination of super magnetic separation and microwave energy technology. The treatment technology comprises the following steps: S10, adding a reducing agent into the effluent, and enabling a reducing reaction to obtain a mixed liquid A; S20, adding nanoscale magnetic seed powder, a flocculating agent and a coagulant aid to the mixed liquid A, and then conducting flocculating settlement; S30, collecting the supernatant after settlement, adding an oxidizing agent and a catalyst to the supernatant, enabling oxidation reaction to obtain a mixture B; S40, further strengthening the oxidation reaction in a microwave field to obtain a mixture C; S50, adding the nanoscale magnetic seed powder, the flocculating agent and the coagulant aid to the mixture C, and conducting the flocculating settlement reaction to obtain a mixture D; S60, separating effluent, sludge and flocculated grains from the mixture D; S70, recycling the nanoscale magnetic seeds from the flocculated grains.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment process based on the combination of supermagnetic separation and microwave energy technology. Background technique [0002] Wastewater is the mixed water of washing wastewater, circulating cooling water and waste electroplating solution in the electroplating production process. According to different electroplating processes, the quality of wastewater varies greatly. Most of the wastewater contains substances such as cyanide, chromium and nickel, which are highly toxic and difficult to biochemically treat. [0003] At present, the common treatment method for wastewater in China is the chemical precipitation method, mainly by adding NaOH or Na 2 S converts heavy metal ions into their hydroxide or sulfide precipitates, but ordinary flocculation and sedimentation takes a long time and requires a larger sedimentation tank, otherwise the separatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12
CPCC02F1/302C02F1/488C02F1/5245C02F1/56C02F1/66C02F1/70C02F1/722C02F1/725C02F1/78C02F9/00C02F2101/18C02F2101/20C02F2101/30C02F2301/08
Inventor 林立陈启胜吴振军崔龙哲
Owner 航天圣诺(北京)环保科技有限公司
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