Coagulating agent for wastewater

• US 5,897,810 A
• Filed: 02/10/1997
• Issued: 04/27/1999
• Est. Priority Date: 02/16/1996
• Status: Expired due to Fees

• Current Assignee: Chiiki Shinko Jigyo-Dan Co., Ltd., Hiroshi Tamaura
• Original Assignee: Chiiki Shinko Jigyo-Dan Co., Ltd., Yutaka Tamaura
• Inventors: Kiryu, Takashi, Tamaura, Yutaka
• Primary Examiner(s): MARCANTONI, PAUL D
• Application Number:
  US08/799,021
• Time in Patent Office: 806 Days
• Field of Search: 252/60, 252/61, 210/705, 210/723, 106/772, 106/773
• US Class Current: 252/60
• CPC Class Codes: B03D 3/06 Flocculation
• CPC Class Codes: C02F 1/5236 using inorganic agents

Abstract

Shell fossil powder is added to a flocculation agent which is mainly composed of gypsum and silicate compound, and the mixture is added to a suspension. The mixing ratio of the flocculation agent and shell fossil powder is 3:1. The flocculation agent functions as a coagulation core A, and the shell fossil powder is able to absorb grains in the suspension as a carrier B and is acquired by the coagulation core A. The carrier B is a grain which is able to effectively utilize Ca²⁺ flocculation site of the coagulation core A, which absorbs a great deal of suspending grains, wherein the suspending grains are acquired by the coagulation core A and form a large flock and are quickly settled.

Claims

1. A coagulating agent for wastewater treatment comprising:

a flocculant forming coagulation cores having first flocculation sites for capturing grains contained in wastewater, said coagulation cores including crystalline gypsum and gypsum dihydrate, and

carriers formed of a porous powder containing calcium carbonate, said carriers being captured in the first flocculation sites of the coagulation cores and having second flocculation sites for capturing grains contained in wastewater, a number of the first flocculation sites for absorbing the carriers being greater than a number of the first flocculation sites for absorbing the grains, the coagulation cores and the carriers being mixed in a ratio of 3;

1.

2. A coagulating agent according to claim 1, wherein said first flocculation sites are Ca²⁺ flocculation sites.

3. A coagulating agent according to claim 2, wherein said carriers contain amorphous constituents dissolved in water and become water glass.

4. A coagulating agent according to claim 3, wherein said carriers are granular shell fossil.

5. A coagulating agent according to claim 4, wherein the number of the first flocculation sites for absorbing the carriers is ten times greater than the number of the first flocculation sites for absorbing the grains.

6. A coagulating agent according to claim 4, further comprising aluminum sulfate to improve flock forming mechanism.

7. A coagulating agent for wastewater treatment comprising, a flocculation agent including gypsum, and shell fossil powder in a mixing ratio of 3:

1, said flocculation agent and shell fossil powder being united together and capturing grains contained in wastewater.

8. A coagulating agent according to claim 7, wherein said flocculation agent captures the shell fossil powder and the grains contained in wastewater, and the shell fossil powder absorbing the grains in wastewater.