A treatment method for heavy metal-containing wastewater

A treatment method and technology for heavy metals, applied in the field of water treatment, can solve the problems that the pH value cannot meet the requirements of precipitation or effluent, the heavy metal ions or suspended solids do not meet the standard, and the precipitation effect is not good. The effect of eliminating cumbersome processes

Inactive Publication Date: 2011-11-30
JIANGSU NANFANG COATING & ENVIRONMENT PROTECTION EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the existing chemical precipitation method, the process flow is often long if the effluent reaches the standard; the PH value of the short process flow cannot meet the requirements of precipitation or effluent standard, and even the precipitation effect is not good, resulting in heavy metal ions or suspended matter not meeting the standard

Method used

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  • A treatment method for heavy metal-containing wastewater
  • A treatment method for heavy metal-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, first lead-containing wastewater with a pH value of about 1 is introduced into the pH adjustment tank, and at the same time, a certain amount of liquid caustic soda with a concentration of 35% is added into the pH-adjusted pool. 1:100-120, adjust the PH value of lead-containing wastewater to 10.5-11 after chemical reaction; then import the lead-containing wastewater after pH adjustment into the distribution pool, and add coagulant and coagulation aid in the distribution pool In order to strengthen the sedimentation effect, the lead-containing wastewater in the water distribution pool flows into the sedimentation tank for coagulation and sedimentation under the action of gravity, and the supernatant after coagulation and sedimentation overflows from the weir on the upper side of the sedimentation tank. The mud falls into the sludge area on the bottom side of the settling tank, and is exported from the sludge outlet on the bottom side of the set...

Embodiment 2

[0025] Such as figure 1 As shown, first lead-containing wastewater with a pH value of 1 is introduced into the pH adjustment tank, and at the same time, a certain amount of liquid caustic soda with a concentration of 20% is added into the pH adjustment tank. :55-65, after the chemical reaction, the pH value of the lead-containing waste water is adjusted to 10-10.5; then the lead-containing waste water after the pH value adjustment is introduced into the distribution pool, and coagulant and coagulant are added in the distribution pool In order to enhance the sedimentation effect, the lead-containing wastewater in the water distribution tank flows into the sedimentation tank under the action of gravity for coagulation and sedimentation, and the supernatant after coagulation and sedimentation overflows from the weir on the upper side of the sedimentation tank, and the sludge obtained by sedimentation at the same time It falls into the sludge area on the bottom side of the sedimen...

Embodiment 3

[0027] Such as figure 1 As shown, first lead-containing wastewater with a pH value of 2 is introduced into the pH adjustment tank, and at the same time, a certain amount of liquid caustic soda with a concentration of 30% is added into the pH adjustment tank. :800-970, after the chemical reaction, the pH value of the lead-containing wastewater is adjusted to 9-10.5; then the lead-containing wastewater after the pH value adjustment is introduced into the distribution pool, and coagulant and coagulant are added in the distribution pool In order to enhance the sedimentation effect, the lead-containing wastewater in the water distribution tank flows into the sedimentation tank under the action of gravity for coagulation and sedimentation, and the supernatant after coagulation and sedimentation overflows from the weir on the upper side of the sedimentation tank, and the sludge obtained by sedimentation at the same time It falls into the sludge area on the bottom side of the sediment...

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Abstract

The invention discloses a treatment method for heavy metal-containing wastewater. The treatment method is carried out according to the following steps: first, adjust the pH value of the heavy metal-containing wastewater with a pH value of 1-3 to 9.5-9.5- 11; Then it is introduced into the water distribution pool with coagulant and coagulant aid added, the wastewater in the water distribution pool flows into the sedimentation tank under the action of gravity for coagulation and precipitation, and the supernatant after coagulation and precipitation is separated from the sedimentation tank The weir on the upper side of the pool overflows, and the precipitated sludge is treated separately; then the obtained supernatant is introduced into the pH adjustment tank to adjust the pH value to 6-9 with an acid solution; finally, the supernatant is sequentially passed through the sand filter and activated carbon adsorption After the pool, it is introduced into the clear water pool. The technological process of the present invention is short, and the cost of land and equipment is less; in the technological process, there are double advanced treatment measures of filtration and adsorption, and double pH adjustment is used, so that the effluent water quality meets the requirements of the "Comprehensive Wastewater Discharge Standard".

Description

technical field [0001] The invention relates to the field of water treatment, in particular to the treatment of waste water or sewage, in particular to a treatment method for heavy metal-containing waste water. Background technique [0002] Heavy metal wastewater refers to wastewater containing heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation. Heavy metal (such as cadmium, nickel, mercury, zinc, etc.) wastewater is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans, and its water quality and quantity are related to the production process. The heavy metals in wastewater cannot be decomposed and destroyed by various common methods, but can only transfer their location and change their physical and chemical forms. For example, after chemical precipitation treatment, heavy metals in wastewater are transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/28C02F101/20
Inventor 李爱军叶多梅
Owner JIANGSU NANFANG COATING & ENVIRONMENT PROTECTION EQUIP
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