JPH0436757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sorbing and removing pollutants such as human waste and sewage using single-celled green algae of the genus Chlamydomonas, and at the same time converting the pollutants into drinking water.

[Prior Art] Conventionally, methods for treating pollutants in human waste and sewage, that is, domestic wastewater, have mainly been carried out using biological methods, such as activated sludge method, trickling filter method, rotating plate contact method, and contact aeration method. However, precipitation as a pretreatment,
Currently, it is limited to secondary treatment in conjunction with preliminary treatment such as putrefaction, and a more advanced and inexpensive treatment method is desired due to its actual wastewater purification ability.

[Problems to be Solved by the Invention] The method for treating human waste and sewage pollutants according to the present invention is characterized by the vigorous reproductive ability of single-celled green algae of the genus Chlamydomonas under certain environmental conditions and the excellent collection of pollutants such as phosphorus and nitrogen. It is an innovative method for treating polluted wastewater that utilizes adhesion and can be applied to any scale of wastewater volume, either as an alternative to conventional treatment methods or as an advanced treatment method that complements conventional treatment methods.

The unicellular green alga of the genus Chlamydomonas used in the present invention is Chlamydomonas Reinhardii, class Chlorophyceae, order Volvocales, strain name R. Sager strain 95, which contains photosynthetic pigments, A type of unicellular green algae with whip-shaped flagella, ATCC
No.18302. Hereinafter, it will be abbreviated as Chlamydomonas.

[Means for solving the problem] 1. In a method for removing pollutants such as human waste and sewage using unicellular green algae of the genus Chlamydomonas, (1)
First, suspended matter is removed by sedimentation, (2) bacteria and virus pathogens are highly oxidized and removed from the separated polluted water using ultraviolet rays and ozone gas, and (3) the inflow water is heated to a solar system (24℃ to 26℃). ℃), (4) Chlamydomonas unicellular green algae enters a growth tank of R Sager Strain 95, and pollutants are sorbed to the green algae, and (5) human waste and sewage are separated. A method of removing pollutants such as the like using single-celled green algae of the genus Chlamydomonas and obtaining drinking water.

2. Removal of pollutants such as human waste and sewage using Chlamydomonas spp. unicellular green algae according to claim 1, characterized in that water containing pollutants is passed several times through a growth tank of Chlamydomonas spp. unicellular green algae Earl Sager Strain 95. How to get drinking water as well.

3. A method for removing pollutants such as human waste and sewage using Chlamydomonas spp. unicellular green algae and obtaining drinking water according to claims 1 and 2, wherein all steps are automated.

The currently implemented secondary treatment of domestic wastewater is insufficient in terms of environmental conservation of water bodies, and is leading to further environmental deterioration. In addition to secondary treatment, high-level treatment using chemical methods is not currently available due to technical feasibility or cost issues.

The method of draining domestic wastewater into a Chlamydomonas culture tank as described above and removing pollutants according to the present invention is a system that utilizes Chlamydomonas, which has an extremely excellent ability to adsorb pollutants and can proliferate permanently. It is.

[Action] Chlamydomonas can act under certain environmental conditions (nutrient sources,
When the domestic wastewater to be treated passes through the suspension, the unicellular algae have a strong ability to adsorb pollutants and can easily remove them. It is something that can be done.

Examples will be described below, but the present invention is not limited thereto.

[Example] Example 1 Human waste, sewage, etc. are passed through a pipe using an Imhoff digester using two pumps.
Digester). Here the suspended matter settles out and is largely removed. The water then passes by gravity through a strainer where it is exposed to air and suspended particles are removed by settling. Then enters the clarifier,
It is sent to the next processing plant using a pump. Treatment with UV light and ozone gas to reduce bacterial and viral contamination. After this pretreatment, the water flows by gravity to an ozone-decay water storage chamber, where the ozone gas decomposes into oxygen gas. The water then goes from the ozone decay chamber through a solar system (temperature 24° C. to 26° C.) to the Chlamydomonas growth pollutant sorption device, or directly to the Chlamydomonas growth pollutant sorption device. The direction of water flow is determined by the temperature of the contaminated water. Water passing through the solar system passes through a microporous filter, where particles up to 300 microns are removed. The microporous filter is equipped with an automatic backflow device to remove collected compounds.

The incoming water is routed through the solar system,
It collects in a 10,000 gallon water storage tank. The heated water flows by gravity to the Chlamydomonas growth pollutant sorber where the water is used to grow Chlamydomonas.

Water treated with Chlamydomonas is pumped to a treatment plant where Chlamydomonas is removed by overaction. Chlamydomonas-free water flows from the filter to a clean water storage tank. The first filter is backwashed with water from the clean water storage tank, and the backflow water containing Chlamydomonas is discharged to the evaporation pond.

The above facilities will be automated.

The operation linkage is a flashing method using a switch.

It is connected to a blinking system that controls all operations in conjunction, so that if one operation stops working, the entire device will stop.

The pump installed in the last purifier indicates a low water standard. It is activated by the signal of the reference monitor of the Chlamydomonas reactor. At the same time, a second pump in the ozone decay storage chamber is activated, which pumps water to the Chlamydomonas growth and sorption device either directly or through a solar system.

This signal also determines whether or not to heat the requested water. The functionality of a solar system is determined by the temperature of the panel surface. Once the various temperature switches are activated in the pump chamber, water passes through the solar system and then flows to the Chlamydomonas sorption device.

If the differential switch is not activated, water will not flow into the Chlamydomonas sorption chamber until activated by temperature.

In summer, the solar system is bypassed manually and water flows directly from the ozone decomposition water storage chamber to the Chlamydomonas reactor. When the Chlamydomonas reaction sorption device fills with water, the signal from the reference monitor stops and the final purifier and ozone decay storage chamber pumps stop.

Filtration of the Chlamydomonas treated water continues around the clock and is operated independently of the external water flow system.

FIG. 1 shows the relationship between the total number of Escherichia coli in the Chlamydomonas reaction and sorption device and time.

After about 4 days, most of the E. coli bacteria were gone.

Chlamydomonas growth not only produces high quality wastewater but also produces high quality biomass.

Table 1 shows the chemical components of Chlamydomonas grown in polluted water, and Table 2 shows the bacteriological analysis values of Chlamydomonas grown in polluted water.

Table 1 Chemical composition of Chlamydomonas Dry weight % (grown in sewage) Protein 50-55 Lipid 4-8 Carbohydrate 20-30 Ash 4-8 Fiber 3 Moisture 3-6 Table 2 Grown in sewage Bacteriological analysis of Chlamydomonas Aerobic bacteria 2900 cells/g Yeast and filamentous fungi 40 cells/g Escherichia coli 〓3 cells/g Clotting active Staphylococcus not detected〓 3 cells/g Salmonella NoneLindane 0.159ppm Aldrin 0.1702ppm Other chlorinated carbohydrates Not detected <0.001ppm polychlorobiphenyl (highly toxic)
Not detected <0.04ppm Note: Analysis was performed after exposing Chlamydomonas to shortwave radiation for 90 seconds.

Tables 3, 4 and 5 show the BOD, COD and other analytical values of treated sewage in a certain area.

Table 3 Sample A Analysis mg/ BOD 20 COD 96 Escherichia coli <1 Colony/100ml PH 8.0 Table 4 Sample B Analysis mg/ BOD 10 COD 110 E. coli 19Coloies/100ml PH 7.8 Table 5 Sample A Analysis mg/ BOD 8 Escherichia coli <1 Colony/100ml Note: The analytical values required by water quality control regulations are as follows.

BOD 30mg/or less COD 125mg/or less Solid matter that can be fixed: 0.5mg/or less Escherichia coli 500organisms/100ml or less PH 6.6-8.6 [Effects of the invention] 1. Much cheaper than conventional methods for removing pollutants from domestic wastewater.

2. Phosphorus, nitrogen, and other substances can be removed almost 100% by replacing the culture tank with fresh unicellular green algae of the genus Chlamydomonas at regular intervals (usually 2 hours).

3. Unicellular green algae of the genus Chlamydomonas can be produced without limit, and therefore sorption resources are generated without limit.

[Brief explanation of drawings]

Figure 1 shows the total number of E. coli versus time in the Chlamydomonas growth tank.

Claims (1)

[Claims] 1. A method for removing pollutants such as human waste and sewage using unicellular green algae of the genus Chlamydomonas, which includes (1) first removing suspended matter by sedimentation, and (2) exposing the separated polluted water to ultraviolet light. and ozone gas to highly oxidize and remove bacterial and viral pathogens, (3) the inflow water is heated by passing through a solar system (24°C to 26°C), and (4) unicellular green algae of the Chlamydomonas sp. Strain 95 enters the growth tank, sorbs the pollutants into the green algae, and (5) separates the pollutants from water, such as human waste and sewage, by using Chlamydomonas spp. unicellular green algae. How to get water. 2. The human waste according to claim 1, wherein the water containing pollutants is passed several times through a growth tank of unicellular green algae of the genus Chlamydomonas R. Sager Strain 95.
A method of removing pollutants from water such as sewage using unicellular green algae of the genus Chlamydomonas and obtaining drinking water. 3. A method for removing pollutants from river water, including human waste, sewage, etc., using unicellular green algae of the genus Chlamydomonas and obtaining drinking water according to claim 1 or 2, wherein all steps are performed automatically. .