JPS604759B2 - Deodorization method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing bad odors generated during a wastewater treatment process. The present invention relates to a method for removing malodors generated during the treatment process by contacting with a slurry with calcium.

Currently, the biological treatment methods for organic wastewater such as industrial wastewater and domestic wastewater are represented by the activated sludge method and the spray hearth method, but the activated sludge method requires complicated maintenance and production. There are many inconveniences such as sludge treatment.

The scattering hearth method has become widely used in recent years because it is easy to operate and can be expected to improve processing efficiency through the development of fillers. Since this spray hearth method is an aerobic process, it is essential to maintain the living environment of microorganisms in an aerobic state at all times, but it is difficult to maintain an aerobic atmosphere for a long period of time, and aerobic If the atmosphere is disrupted, not only will processing efficiency drop, but bad odors and hearth dust will occur, which will not only delay work but also have a negative impact on the social environment. In addition, organic wastewater contains various forms of sulfur compounds and nitrogen compounds, and due to the action of reducing bacteria, hydrogen sulfide, amines, aldehydes, etc. generate bad odors, causing environmental destruction. The present inventor has focused on the problems of aerobic biological treatment, that is, how to maintain an aerobic state for a long period of time, and as a result of intensive research, we have found that microorganisms that adhere to the surface of a filled hearth using the spray hearth method etc. The present invention was completed by discovering an extremely effective deodorizing method for wastewater treatment using the oxidation effect of membranes.

The present invention can remove bad odors and cut off the source of the bad odor by simply adding a chemical prepared by the method described below to wastewater, and also improves the living environment of microorganisms, thereby improving treatment efficiency. It is something that can be done. That is, in the present invention, when aerobically treating organic wastewater with a fixed biofilm,
This is an odor control method characterized by adding a slurry of hydrogen peroxide and calcium peroxide to the water to be treated.

Mechanistically, the present invention oxidizes and decomposes the generated odor in the liquid before dissipating it into the atmosphere, but in the spray hearth method, the water to be treated is installed in the pipes by a pump before being sprayed on the hearth. The slurry added to the transported wastewater is mixed uniformly and sprinkled on the hearth, and while passing through the hearth, some of it (especially calcium peroxide) adheres to the biofilm on the surface of the furnace material and creates a living environment for microorganisms. Can be maintained in an aerobic atmosphere for long periods of time.

Furthermore, the decomposition of the adhering calcium peroxide prevents the hearth from becoming acidic, so there is no overgrowth of fungi, and the hearth is not clogged and no odor is generated. In addition, it is possible to prevent the abnormal growth of anaerobic bacteria in the idle portion of the hearth and the decay of the biofilm in the hearth when watering is stopped, and there is no fear of the occurrence of odors associated with these. The unreacted and unadsorbed slurry that has passed through the hearth flows down into the treated water receiving tank together with the treated water.
Improve the environment of a strong anaerobic tank containing a large amount of stripped sludge.

However, the concentration of the slurry added to the water to be treated must be limited to an extent that does not destroy the biofilm in the hearth, taking into account its bactericidal effect. Further, if the odor generated from the treated water receiving tank is severe, the odor can be easily suppressed by adding the slurry to the receiving tank again.

Although the concentration and blending ratio of hydrogen peroxide and calcium peroxide used in the present invention cannot be determined unconditionally depending on the composition of the wastewater,
The concentration of the slurry passing through the hearth is adjusted to keep the hydrogen peroxide content below 10 μg. The slurry added to the treated water receiving tank is not restricted by concentration. The present invention can be applied not only to the scattering hearth method but also to treatment methods such as the rotating disk method, and can remove bad odors extremely advantageously.

The present invention will be specifically explained below with reference to Examples.

Example 1 Wastewater from the food processing industry is recycled into a plastic furnace village (
Treated by high-speed scattering hearth method using a mirror (approximately 2 blood),
Until now, treatment had been carried out almost smoothly, but the COD of wastewater
This, combined with the rise in temperature, caused a considerable odor to be emitted near the hearth.

Therefore, in the storage tank (volume 1 M3) in front of the spray hearth,
50% calcium peroxide lk9, 35% hydrogen peroxide lk
9 was added to 100 ml of water and a mixed solution was added.

Claims (1)

[Claims] 1. An odor control method characterized by adding a slurry of hydrogen peroxide and calcium peroxide to the water to be treated when organic wastewater is aerobically treated with a fixed biofilm.