KR100362742B1 - Livestock wastes and high density nitrogen water wastes nitrogen remove method - Google Patents

Abstract

The present invention is heterotrophic denitrification and sulfur for minimizing the alkalinity supply which is denitrified and consumed during denitrification by maximizing the nitrogen present in the livestock wastewater and the nitrogen-containing wastewater (NOx-N). A method for removing nitrogen in wastewater which allows denitrification to occur in a particle biofilter.

The present invention allows the wastewater of the first sedimentation basin to enter the final sedimentation basin after the nitrification tank and the denitrification tank, but the immersion type solid-liquid separator is installed in the nitrification tank (aerobic tank), and the denitrification tank is a heterotrophic microorganism and a sulfur particle biofilter installed. It is divided into microbial tank, and is made by installing internal transport water line from nitrification tank (aerobic tank) and heterotrophic microbial tank to sulfur particle biofilter tank which accelerates the denitrification effect.

Description

Nitrogen removal method in livestock wastewater and high concentration nitrogen containing wastewater {Livestock wastes and high density nitrogen water wastes nitrogen remove method}

The present invention is heterotrophic denitrification and sulfur for minimizing the alkalinity supply which is denitrified and consumed during denitrification by maximizing the nitrogen present in the livestock wastewater and the nitrogen-containing wastewater (NOx-N). The present invention relates to a method for removing nitrogen in livestock wastewater and high concentration nitrogenous wastewater which causes denitrification in a particle biofilter.

The characteristics of high concentration nitrogen-containing wastewater and livestock wastewater are relatively low in organic carbon sources necessary for nitrogen and phosphorus removal compared to nitrogen and phosphorus to cope with organic carbon sources by chemical input, but the problem of excessive consumption of chemical cost is suggested. have.

In order to solve this problem, attempts to denitrify using sulfur irrelevant to the carbon source in the raw water.

Denitrification with various sulfur compounds, sulfur is to grow the autotrophic microorganisms attached to the surface of sulfur particles _{^{(S 2-, S, S 2}} O 3 2-, S 4 O 6 2-, SO 3 2-) to SO ₄ ^2- while at the same time as oxidation of the carbon source in the raw water by removing the NO was converted to nitrogen gas ^3- embodiment is an independent process.

Such sulfur-use denitrification does not require an external carbon source for autotrophic microorganisms, and thus, inexpensive sulfur particles may be used to induce denitrification economically and efficiently.

Independent Nutrition Microorganisms

^{_{NO 3 - + 1.1S + 0.4CO 2}} + 0.76H 2 O + 0.08NH 4 + → 0.5N 2 ↑ + 1.1SO 4 2- + 1.28H + + 0.08C 5 H 7 O 2 N

However, the autotrophic microorganisms attached to the sulfur particles consume excessive alkalinity as the reaction proceeds, causing a drop in pH and adversely affecting the entire process. (Consuming CO ₂ in the above reaction formula)

In order to avoid such a problem, the present invention supplies the alkalinity which is insufficient in the denitrification reaction of the independent nutrient microorganisms to the alkalinity generated in the denitrification reaction of the heterotrophic microorganism by simultaneously seeding the autotrophic and heterotrophic microorganisms in the process. The denitrification effect is to achieve.

The biochemical scheme is as follows.

Heterotrophic Microorganisms

^{_{NO 3 - + 1.08H 3 OH +}} 0.24H 2 O 3 → 0.056C 5 H 7 NO 2 + 0.47N 2 ↑ + 1.68H 2 O + HCO 3 -

However, heterotrophic microorganisms produce alkaline (HCO ₃ ⁻ ) by the above chemical reaction formula, but combine with sulfur particles to produce hydrogen sulfide (H ₂ S) which has toxic effects on microorganisms by the following biochemical reactions. Sometimes.

The biochemical scheme of heterotrophic microorganisms is as follows.

Heterotrophic Microorganisms

^{_{1 / 8S 2 O 3 2- +}} 5 / 8H 2 / O → 1 / 4SO 4 2- + 5 / 4H + + e - -------- Step 1 expression

Heterotrophic Microorganisms

^{_{1 / 8SO 4 2- + 19 /}} 16H + + e - → 1 / 16H 2 S + 1 / 16HS - + 1 / 2H 2 O -------- Step 2 expression

In order to avoid the adverse effects caused by the generation of hydrogen sulfide (H ₂ S) as described above, the denitrification nitrogen 140 as shown in FIG. 3 is a heterotrophic microorganism 140-1 and two independent microorganisms 140-2. Divided into stages (Stage), the heterotrophic microorganism 140-2 was installed in the sulfur particle biofilter 130 to induce the growth of the autotrophic microorganism.

This arrangement of the process ensures alkalinity by the heterotrophic microorganisms in the heterotrophic microorganism 140-1 and at the same time avoids hydrogen sulfide produced by the reaction with the sulfur particles.

In addition, the independent nutrient microbial tank 140-2 uses a packed-phase reaction tank, so that the solids residence time is long, so that the amount of sludge is reduced and power costs such as stirring and conveyance are not consumed.

1 is a conventional advanced processing process diagram

Figure 2 is a conventional high processing process for chemical treatment

3 is a biofilter combination process diagram of the present invention using heterotrophic denitrification and sulfur particles as media.

[Explanation of symbols on the main parts of the drawings]

10: inflow water 20: initial settler

30: anaerobic tank 40: denitrification tank

50: nitric oxide tank 60: final settler

70: inner conveying line 80: sludge conveying line

90: 2nd anaerobic tank 100: 2nd flag

110: chemical injection equipment 120: media (installed if necessary)

130: sulfur particle biofilter 140: denitrification tank

140-1: heterotrophic microorganisms 140-2: autotrophic microorganisms

150: internal sludge transport line 160: internal transport water line

170: immersion type solid-liquid separator

1 is a conventional advanced processing process diagram

The inflow source 10 is precipitated in the initial settler 20 and after nitrifying the ammonia nitrogen (NH ₄ -N) in the anaerobic tank 30, the denitrification tank (anoxic tank) 40 and the nitrification tank (aerobic tank) 50 It is internally transported to the front denitrification tank (anoxic tank) 40 to induce denitrification using an organic carbon source in raw water.

However, the process is discharged to the final settler 60 directly from the nitrification tank (exhalation tank) 50 has the disadvantage that the nitrified nitrogen removal in the nitrification tank (exhalation tank) 50 is impossible.

FIG. 2 is a high processing flow chart developed to compensate for the shortcomings in FIG.

A second denitrification tank (anoxic tank) 90 and a second nitrification (aerobic tank) 100 were installed at the rear end of the nitrification tank 50.

In this process, in order to secure a carbon source required for the second denitrification tank (oxygen tank) 90, the chemical input facility 110 is provided as an external carbon source to induce denitrification.

However, the drug input has a disadvantage in that it is a burden on the cost in terms of maintenance costs.

3 is a denitrification tank which causes denitrification at the rear end of the nitrification tank (aerobic bath) 50 at 1 and 2 degrees to compensate for the above-described problems and to avoid the generation of hydrogen sulfide produced by the biochemical reaction between heterotrophic microorganisms and sulfur particles. (140) is installed, the denitrification tank 140 is divided into a heterotrophic microorganism (140-1) and an independent nutritional microorganism (140-2), and then the sulfur particle biofilter 130 is an independent nutrition microbial tank Installed only at (140-2), and immersed solid-liquid separator (UF) at the end of the nitrification tank (aerobic tank) 50 in order to prevent blockage or short-circuit phenomenon caused by suspended matter produced by heterotrophic microorganisms (170). Installed).

By configuring as described above, the alkalinity generated in the denitrification reaction of the heterotrophic microorganism can be supplied to an alkalinity deficient in the denitrification reaction of the autotrophic microorganism, and the further denitrification effect of the heterotrophic microorganism can be obtained.

In particular, by installing the inner transport water line 160 to the nitrification tank (aerobic tank) and the heterotrophic microorganism tank in the sulfur particle biofilter 130 may be characterized by further accelerating the denitrification effect.

The present invention is to install a denitrification tank divided into a heterotrophic microbial tank and an independent nutritional microbial tank next to the nitrification tank to remove nitrogen in the waste water, install a submerged solid-liquid separation device in the nitrification tank and a sulfur particle biofilter in the independent nutrition microbial tank For example, the independent nutrient and the heterotrophic microorganism can be planted at the same time to supply the alkalinity generated in the denitrification reaction of the heterotrophic microorganism with insufficient alkalinity and the additional denitrification effect of the heterotrophic microorganism can be obtained. Desulfurization can be further accelerated through the internal transport of nitrifiers and heterotrophic microbes in sulfur particle biofilter baths.

In addition, the use of a packed-bed reactor lengthens the residence time of the solids, thus reducing the amount of sludge produced and additionally reducing power consumption such as stirring and conveying.

Claims (2)

Wastewater from the first sedimentation basin is introduced into the final sedimentation basin after nitrification and desulfurization tanks, but an immersion type solid-liquid separator is installed in the nitrification tank (aerobic tank), and the denitrification tank is divided into a heterotrophic microbial tank and an independent nutrient microbial tank equipped with a sulfur particle biofilter. Nitrogen removal in livestock wastewater and concentrated nitrogen-containing wastewater, characterized in that to further accelerate the denitrification effect by installing an internal transport line from the sulfur particle biofilter tank to nitrification tank and heterotrophic microbial tank. delete