Waste water treatment method and waste water treatment apparatus

Abstract

In a waste water treatment apparatus and/or method, waste water containing aminoethanol and dimethyl sulfoxide is introduced into a first denitrification tank within a first waste water treatment apparatus. Malodorous gas generated in the first waste water treatment apparatus is decomposed and treated in a second waste water treatment apparatus where another waste water is treated as another system. The second waste water treatment apparatus has a second nitrification tank including a semi-anaerobic section. The malodorous gas is introduced from the first waste water treatment apparatus into a scrubber. The malodorous gas is treated by sludge which is circulated between the second nitrification tank and the scrubber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a schematic view of a waste water treatment apparatus according to a first embodiment of the present invention and modification thereof;

FIG. 2 is a schematic view of a waste water treatment apparatus according to a second embodiment of the present invention and modification thereof;

FIG. 3 is a schematic view of a waste water treatment apparatus according to a third embodiment of the present invention and modification thereof;

FIG. 4A is a time chart of respective tanks according to the first to third embodiments in the case where a dimethyl sulfoxide concentration is approximately 80 ppm and a nitrogen concentration is approximately 3000 ppm; and

FIG. 4B is a time chart of respective tanks according to the first to third embodiments in the case where a dimethyl sulfoxide concentration is approximately 160 ppm and a nitrogen concentration is approximately 3000 ppm.

Claims

1. A waste water treatment method, comprising the steps of: bringing malodorous gas and sludge into contact with each other; andintroducing the sludge which has brought into contact with the malodorous gas and treatment water into a high concentration microbial tank in which a microbial concentration is 10000 ppm or more.

2. A waste water treatment apparatus, comprising: a contact section for receiving malodorous gas and sludge and brining the malodorous gas and the sludge into contact with each other; anda high concentration microbial tank for receiving the sludge which has brought into contact with the malodorous gas and treatment water and having a microbial concentration of 10000 ppm or more.

3. The waste water treatment apparatus as set forth in claim 2, wherein the contact section is a scrubber.

4. The waste water treatment method as set forth in claim 1, wherein the malodorous gas contains sulfur generated during biological treatment of waste water containing aminoethanol and dimethyl sulfoxide.

5. The waste water treatment apparatus as set forth in claim 2, wherein the high concentration microbial tank has a polyvinylidene chloride filler material.

6. The waste water treatment apparatus as set forth in claim 2, wherein the high concentration microbial tank has a submerged membrane.

7. The waste water treatment apparatus as set forth in claim 2, wherein the high concentration microbial tank has a lower semi-anaerobic section and an upper aerobic section.

8. The waste water treatment apparatus as set forth in claim 2, further comprising: a denitrification and nitrification section for denitrifying and nitrifying nitrogen waste water, whereinthe high concentration microbial tank is a nitrification tank included in the denitrification and nitrification section.

9. The waste water treatment apparatus as set forth in claim 8, wherein the denitrification and nitrification section has:a denitrification tank;the nitrification tank; andan air-lift pump for circulating treatment water from the nitrification tank to the denitrification tank.

10. The waste water treatment apparatus as set forth in claim 9, wherein treated water which has biologically been treated and/or sludge generated during biological treatment are introduced into the denitrification and nitrification section.

11. A waste water treatment apparatus, comprising: a first waste water treatment section for performing first waste water treatment and generating malodorous gas; anda second waste water treatment section for performing second waste water treatment and decomposing and treating the malodorous gas generated by the first waste water treatment section,the first waste water treatment section having: a first denitrification tank for receiving waste water containing aminoethanol and dimethyl sulfoxide; anda first nitrification tank having a semi-anaerobic section, andthe second waste water treatment section having: a second denitrification tank for receiving nitrogen waste water;a second nitrification tank having a semi-anaerobic section;a scrubber for receiving malodorous gas from the first waste water treatment section;a first sludge introduction section for introducing sludge from the second nitrification tank into the scrubber; anda second sludge introduction section for introducing the sludge from the scrubber into the second nitrification tank.

12. The waste water treatment method as set forth in claim 1, wherein the malodorous gas contains volatile organic compounds.

13. The waste water treatment apparatus as set forth in claim 2, wherein the malodorous gas contains volatile organic compounds.

14. The waste water treatment method as set forth in claim 1, wherein the sludge contains micro-nano bubbles.

15. The waste water treatment apparatus as set forth in claim 2, wherein the sludge contains micro-nano bubbles.

16. The waste water treatment method as set forth in claim 12, wherein the volatile organic compounds contained in the malodorous gas contain at least one of isopropyl alcohol, acetone and butyl acetate.

17. The waste water treatment apparatus as set forth in claim 13, wherein the volatile organic compounds contained in the malodorous gas contain at least one of isopropyl alcohol, acetone and butyl acetate.