JPH11128956A - Treatment of heavy metal-containing wastewater with protein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove heavy metals from wastewater by a method in which, after a protein being mixed into wastewater in a reaction vessel and after adequate agitation/reaction being done, the adjustment of pH to a specified range is done, the sedimentation/precipitation of the protein in which the heavy metals are wrapped up is done, the pH of precipitated sludge is adjusted in a specified range with an acid to separate the sludge into the heavy metals and the protein. SOLUTION: Wastewater in a waste disposal site is subjected to pretreatment by a filtration device 1 of a filter such as diatomaceous earth to separate solids to be subjected to reclamation disposal. Besides, wastewater passes through a flow rate adjustment tank 2, is mixed with a protein in a reaction vessel 3, and is agitated enough by an agitator 4. A reaction in which heavy metals are wrapped up by the protein takes place. After the end of the reaction, pH is adjusted to 9-12 in a pH adjustment part 11, the sedimentation/precipitation of the protein is done in a precipitation tank 5. Precipitated sludge is sent to a pH adjustment part 12 by the operation of a valve 6, pH is adjusted to 1-4 to be separated into the protein and the heavy metals in a separation tank 7. After the separation, the heavy metals and the protein are classified by a filter 8 for removing acidic substances, the heavy metals are removed, and the protein is reused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment method for separating and removing heavy metals from wastes containing heavy metals using proteins.

[0002]

2. Description of the Related Art In the prior art, heavy metals were removed by sedimentation using a chelating material or an aluminum adsorbent to solidify and incinerate.

[0003]

SUMMARY OF THE INVENTION Heavy metals are removed from wastewater by utilizing the properties of proteins that encapsulate the metals.

[0004]

[Means for Solving the Problems] Wastewater in a waste disposal site is separated into undissolved solids produced by pretreatment with a filter device such as a diatomaceous earth filter, and the solids are subjected to landfill disposal at a disposal site. After adjusting the flow rate, mixing the protein with the protein in the reaction tank and performing a sufficient stirring reaction to complete the reaction in which the protein wraps the heavy metal by the action of the protein. Then, the pH is adjusted to 9 to 12, and the protein wrapping the heavy metal is settled to precipitate the sludge. A method for treating heavy metal-containing wastewater with proteins, comprising adjusting the pH to 1 to 4 to separate heavy metals and proteins, removing heavy metals with a filter for removing PH acidic substances, and removing and reusing proteins.

[0005]

[Function] A wastewater containing a heavy metal substance is mixed and stirred with a protein to react, and the protein wraps the heavy metal, and the pH is adjusted to 9 to 12 by a PH adjustment unit, whereby the wrapped protein is settled and settled in a sedimentation tank. Is adjusted to PH1 to PH4, heavy metals and proteins are separated in the separation tank, and heavy metals are removed.

[0006]

[Embodiment] Wastewater in a waste disposal site is separated into solid waste by pretreatment with a filter device 1 such as a diatomaceous earth filter, and the wastewater is mixed with protein in a reaction tank 3 through a flow rate adjustment tank 2 and stirred. The protein wraps the heavy metal by sufficiently stirring with the machine 4. After the completion of the reaction, PH 9 to
12 and sediment the protein in the sedimentation tank 5. The precipitated sludge is sent to the PH adjustment unit 12 by operating the valve 6 to adjust the pH to 1 to 4 and the protein and heavy metal are separated in the separation tank 7. The heavy metal and the protein are separated by the filter 8 for removing substances, the heavy metal is removed, and the protein is reused.

[0007]

According to the present invention, a heavy metal contained in wastewater in a waste disposal site can be easily and economically treated, and proteins and treated water can be reused. The removed heavy metal is solidified into concrete and disposed of.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration apparatus 2 Adjustment tank 3 Reaction tank 4 Stirrer 5 Sedimentation tank 6 Valve 7 Separation tank 8 Filter 9 Water treatment apparatus 10 Pump 11 PH adjustment part PH9-12 12 PH adjustment part PH1-4 a Solid substance b Protein c Heavy metal

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI C02F 9/00 504 C02F 9/00 504E

Claims (1)

[Claims] The wastewater in a waste disposal site is separated from undissolved solid matter generated by pretreatment with a filter device such as a diatomaceous earth filter, and the solid matter is subjected to landfill disposal at a disposal site. After mixing with the protein in the reaction tank and performing a sufficient stirring reaction to complete the reaction in which the protein wraps the heavy metal by the action of the protein, the pH is adjusted to 9 to 12 with an alkaline agent to precipitate and sediment the protein wrapping the heavy metal, and the precipitated sludge A method for treating heavy metal-containing wastewater with proteins, comprising separating heavy metals and proteins by adjusting pH to PH1 to 4 with an acid, removing heavy metals by a filter that removes PH acidic substances, and removing and reusing proteins.