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Three-level polyaluminium chloride coagulation treatment method for electro-polishing wastewater

A technology of polyaluminum chloride and electrolytic polishing, which is applied in metallurgical wastewater treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve problems such as difficult to achieve satisfactory TP treatment effect, endanger the health of surrounding residents, and affect industrial and agricultural production.

Inactive Publication Date: 2012-08-22
南京特克赛环保科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] At present, the main process of electrolytic polishing (ECP) is degreasing-water washing-rust removal-water washing-electropolishing-water washing-neutralization-water washing-passivation-packaging, and these processes will produce pollution with high concentrations of phosphorus and heavy metal chromium Once the wastewater is directly discharged into the natural water, it will cause eutrophication of the water body, affect industrial and agricultural production, destroy the ecological environment, and even endanger the health of the surrounding residents. Therefore, the effective treatment of electrolytic polishing wastewater is of great significance
[0003] Since electropolishing wastewater is rich in heavy metal pollutants such as phosphorus and chromium, especially the concentration of phosphorus can sometimes be as high as 2000-5000mg / L, the existing sewage treatment processes, including biological methods, adsorption methods, ion exchange methods, etc., are difficult To achieve a satisfactory treatment effect, it is urgent to develop a new efficient and reliable electrolytic polishing wastewater treatment process
[0004] From the existing data, the chemical treatment method of electropolishing wastewater is mainly single-stage coagulation method, and the common coagulant is Ca(OH) 2 and PAC (Lin et al, 1997), where Ca(OH) 2 The removal effect on phosphorus is worse than that of PAC, and it is easy to produce tiny suspended particles, which affects the subsequent treatment (Poggi-Varaldo.M et al, 2012); at the same time, because the concentration of phosphorus in electropolishing wastewater is too high, the single-stage PAC treatment process is difficult Achieve satisfactory TP treatment effect

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, the effect of three-stage PAC coagulation on the removal of total phosphorus in wastewater

[0015] The stainless steel electropolishing wastewater from a medical machinery factory in Shandong was placed in five identical Erlenmeyer flasks, and the pH was adjusted to 7.0 during the coagulation reaction at all levels, and then the dosages of the first, second and third levels of PAC were respectively 16, 4 and 4g / L, and the corresponding coagulant PAM dosages are 0.06, 0.02 and 0.01g / L respectively. The results show that the concentration of total phosphorus in the effluent after the three-stage PAC coagulation can be reduced to below 1.0 mg / L (Table 1), which meets the discharge requirements.

[0016]

[0017] Table 1

Embodiment 2

[0018] Embodiment 2, waste water source and other experimental conditions are all the same as example 1, carry out the process operation of small scale (reactor effective volume 5L), meanwhile, pH all is adjusted to 7.0 during coagulation reaction at all levels, then one, two and three The dosage of grade PAC is 16, 4 and 4g / L respectively, and the corresponding dosage of coagulant PAM is 0.06, 0.02 and 0.01g / L respectively. The results show that the concentration of Cr and COD in the effluent after the three-stage PAC coagulation can be reduced to below 0.15mg / L and 120mg / L respectively (Table 2), which meets the discharge requirements.

[0019]

[0020] Table 2

Embodiment 3

[0021] Example 3, Optimization of coagulant dosage in three-stage PAC coagulation process

[0022] The source of wastewater and other experimental conditions are the same as Example 1. In the three-stage PAC coagulation process, when the dosage of PAC increases to 30g / L, it is beneficial to the removal of COD and total phosphorus in wastewater; however, considering the cost of wastewater treatment, the experimental It is determined that the dosage of PAC at each level is 10, 5 and 3g / L respectively (Table 3). After the third-level effluent passes through the membrane, the discharge requirements are met.

[0023]

[0024] table 3

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Abstract

The invention discloses a three-level polyaluminium chloride coagulation treatment process for stainless steel electro-polishing wastewater. By multilevel coagulation treatment, sewage enters an advanced treatment system or is discharged with standards. The test results show that when the three-level polyaluminium chloride coagulation treatment method is adopted for treating high-concentration phosphor-containing electro-polishing wastewater, the concentrations of total phosphorous (TP), chemical oxygen demand (COD) and total chromium (total Cr) in the effluent can respectively reach 0.46, 120 and 0.15 mg / L, and the removal rates are respectively 99.94%, 88.5% and 99.6%. The three-level polyaluminium chloride coagulation treatment method has the characteristics that the operation is simple, various heavy metal ions, COD and TP can be efficiently removed at the same time, and the like; and the three-level polyaluminium chloride coagulation treatment method is also applicable to treating other like high-concentration phosphor-containing wastewater.

Description

technical field [0001] The invention relates to a treatment process for stainless steel electrolytic polishing wastewater, in particular to a method for coagulating wastewater containing high-concentration phosphorus by using a three-stage PAC. Background technique [0002] At present, the main process of electrolytic polishing (ECP) is degreasing-water washing-rust removal-water washing-electropolishing-water washing-neutralization-water washing-passivation-packaging, and these processes will produce pollution with high concentrations of phosphorus and heavy metal chromium Once the wastewater is directly discharged into the natural water, it will cause eutrophication of the water body, affect industrial and agricultural production, damage the ecological environment, and even endanger the health of the surrounding residents. Therefore, the effective treatment of electrolytic polishing wastewater is of great significance. [0003] Since electropolishing wastewater is rich in ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/56C02F103/16
Inventor 刘和刘宏波祖叶品符波
Owner 南京特克赛环保科技有限公司
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