JPH0283094A - Method for removing contaminants from sewage containing hydrogen sulfide, methane gas, organic compound and inorganic compound by utilizing single cell chlorophyceae of genus chlamydomonas - Google Patents

Abstract

PURPOSE:To easily remove the contaminants in underground water by a method wherein underwater is degassed while aerated at constant temp. to be subsequently guide to a growing chamber of single cell chlorophyceae R. Sager strain 95 of the genus Chlamydomonas. CONSTITUTION:In the treatment of underground water containing hydrogen sulfide, methane gas, an org. compound and an inorg. compound, when said underground water is exposed to air at first at a temperature of 20-21 deg.C, gases such as methane, ethane and hydrogen sulfide are removed. Next, said water is guided to a growing chamber of R. Sager strain 95 being single cell chlorophyceae of the genus Chlamydomonas and stirred under aeration at 21-25 deg.C. Hereupon, the chlorophyceae are grown and, at the same time, the contaminants in underground water are adsorbed by the chlorophyceae and the treated water is filtered through a filter bed. As mentioned above, underground water is purified by utilizing Chlamydomonas propagating permanently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for removing pollutants from wastewater containing hydrogen sulfide, methane gas, and organic and inorganic compounds in groundwater. It further relates to methods suitable for drinking water.

[Prior art] Conventional methods for treating organic, inorganic compounds, and other pollutants in groundwater have mainly been biological methods, such as activated sludge method, trickling filter method, rotating plate contact method, and contact aeration method. However, it is limited to secondary treatment in conjunction with pretreatment such as precipitation and putrefaction, and a more advanced and inexpensive treatment method is desired in view of its wastewater purification ability.

[Problems to be Solved by the Invention] The method for treating groundwater according to the present invention aims to improve the vigorous reproductive ability of Chlamydomonas unicellular green algae under certain environmental conditions and the removal of pollutants (e.g. Cu, Pb, Ni, Zn, Fe, etc.). It utilizes the excellent adsorption power of metal compounds (metal compounds and bicarbonates), and is an innovative treatment method that can be applied to any scale of wastewater volume as an alternative to or as an advanced treatment method to complement conventional treatment methods. This is a method for treating polluted wastewater. The unicellular green alga of the genus Chlamydomonas used in the present invention is Chlamydomonas Reinhardi.
i), Chlorophyceae, Volvocales, strain name:
Sager Strain 95 (R, Sager 5tr
ain 95), a type of unicellular green algae with photosynthetic pigments and whip-shaped flagella, and has ATCC No. 18302. Hereinafter, it will be abbreviated as Chlamydomonas.

[Means for solving the problem] 1. In a method for removing pollutants from wastewater containing hydrogen sulfide, methane gas, and organic and inorganic compounds by using unicellular green algae of the genus Chlamydomonas, the temperature is initially set at 20°C to 20°C.
It was kept at 1°C, degassed while being exposed to air, and grown with water while blowing air in the growth chamber of Chlamydomonas genus unicellular green algae Aarsaker Strain 95. j121℃～25℃
Hydrogen sulfide, methane gas, and organic and inorganic compounds are produced by using single-celled green algae of the Chlamydomonas genus, which is characterized in that it is maintained at a constant temperature and agitated to grow algae and sorb pollutants into the green algae, and then filtered through a filter bed. A method for removing pollutants from wastewater containing

2. The filtered water is brought into contact with ozone, and the green algae collected from each house is collected by backflowing normal water and dried. , a method for removing pollutants from wastewater containing methane gas and organic and inorganic compounds.

The current treatment of contaminated groundwater 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 technically possible, but it is currently difficult to utilize due to cost issues.

The above-described method of draining contaminated groundwater into a culture tank for Ramitomonas and removing pollutants according to the present invention is based on the fact that Chlamydomonas has an extremely excellent ability to adsorb pollutants.
This is a system that uses Chlamydomonas, which can proliferate permanently. This is the current situation.

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

[Effect] Chlamydomonas is extremely prolific under certain environmental conditions (nutrients, light, carbon dioxide, temperature), and when contaminated groundwater to be treated is passed through its suspension, single-celled algae can be formed. However, these pollutants can be easily removed because they have a strong adsorption power.

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

[Examples] Example 1 Coal and other particles contained in groundwater in a local area were removed by passing it through a filter (Harmsco model 84).

Filtration gas chamber (15 feet wide, 56 feet deep,
4 feet deep).

Gases such as methane, ethane, hydrogen sulfide, carbon dioxide, and sulfur oxides were removed by exposing to air for about 20 hours. Aeration was performed by a Roots blower (25 horsepower).

The water temperature in the degassing chamber is kept at 20℃ during fall and winter using solar heat.
The temperature was maintained at 21°C. Water from the degassing chamber was pumped through a heat exchange tank (Ik 10,000 gallons) at 1100 GP.

After that, the nursery room (20,000 gallons, 56 feet deep, 15 feet wide)
4 feet deep) through a pipe (6 inches in diameter) fitted with an automatic electric control valve.

A bypass pipe (4 inches in diameter) was installed in the Chlamydomonas growth chamber in front of the control valve.

Water flow was regulated with a manual electric valve. If a bypass system is needed to inhibit Chlamydomonas growth, the algae grow chamber has four pipes (40 feet long, 1.5 inches in diameter) was mounted on a post 6 inches from the floor. Air was pumped into the growth chamber to provide the necessary atmospheric conditions for growth, to maintain a constant temperature, and to agitate the Chlamydomonas medium to expose the cells to the most appropriate amount of sunlight.

The water temperature in the growth chamber was increased from 21°C to 25°C using solar heating to rapidly grow Chlamydomonas and result in the removal of chemicals degraded by increased algae biomass.

The Chlamydomonas-laden water travels down through a pipe (6 inches in diameter) (the pipe is fitted with two manual bypass electric control valves) and into a chemical treatment plant.
ssing build (g) and enters a 6 inch tall, 12 inch diameter filtration device.

The water is then pumped by a submersible pump (100 GPM), through an overhead aeration sprinkler, and falls onto the overbed to eliminate Chlamydomonas. The filter bed consists of layers of coal, fine sand, coarse sand, fine garnet, coarse garnet, fine gravel, and washed gravel, stacked from top to bottom with supporting platforms.

Chlamydomonas collected on the filter was removed by backflowing the filtration device with clean treated water and then dried. The Chlamydomonas-free water passed through a manifold collector located at the bottom of the mixed media-overbed.

The manifold collector was constructed from four 6-foot pieces of perforated pipe (4-inch diameter). Water flowing through the manifold pipe is regulated using an automatic electric valve (6 inch diameter) with a manual backwater pipe (4 inch diameter).

Chlamydomonas-free water is removed from a manifold collector and placed in a 5,000-gallon, cylindrical, conical-bottom, ozone-contact tank (8 feet high, 6 feet in diameter) with a particle odor control valve. insert. Ozone is created by exposing air to ultraviolet light.

Ozone was supplied using an air pump with a sparging head at a rate of t 5gh-1.
(3163 “8°)”.

Ozone injection was continuous and did not depend on water flow. Ozone injection oxidized soluble organic compounds and inhibited microorganisms.

5000 gallon clearwell in line hydraulically balanced by particle capture tank
received the water after ozonation.

The pH of the water was monitored in a purifier valve and automatically adjusted to pH 7.5 with concentrated sulfuric acid. Water was pumped by a submersible pump (20 GPM) from the clean valve and passed through a final microspore filter.

6 filters (Plymouth Shoe Bream 10-1
42-001, 3 micron pore size) are arranged in parallel so that each device can receive 1/6 of the water flow, and finally sterilized with chlorine gas (2 ppm) before leaving the treatment plant. It was done.

Chlorine gas is in the line (Fisher Vota Injector 70
C1721).

The Camco turbine meter sends water to an elevated storage tank (20,000 gallons) two miles from the water treatment plant.
20G PM) was measured.

Table 1 shows the chemical analysis values of the groundwater before treatment and the water after treatment.

Ingredients Arsenic Barium Cadmium Calcium Chromium Copper Fluoride Iron Lead Magnesium Manganese Mercury Selenium Silver Sodium Zinc Table 1 Chemical analysis of groundwater Untreated water Treated water (Ill!II/J1) fnc+/l )0
．． 022 <0.0G1 0.260 <0.010 0,005 0.005 2,000 0.930 <0.004 <0.004 0.242 0.012 0.460 0.320 3.890 0.111 0.054 0.010 0, 629 0.540 < o, ooi < o, ooi < o,
ooi < o, oolo, 008
Q, 0Q2 0.022 <0.001 520.0 200.0 0.112 <0.001 Total amount of chlorine carbon bicarbonate solids pi (50,04,0 B,9 8.7 Notes: Bacteriologically Suitable for human use.

The total amount of solids decomposed was 1,606 mg/j and 645 mg/j (60% reduction).

However, by repeating sorption by algae about three times, it was possible to remove most of the solids.

The main inorganic compound in the contaminant is sodium bicarbonate, which serves as a source of carbon needed for Chlamydomonas growth and is easily fixed by Chlamydomonas during the treatment process.

Furthermore, a bacterial analysis showed that there was no contamination by enteric bacteria or pathogenic bacteria, and the water was found to be suitable for drinking.

[Effects of the invention] 1. It is much cheaper than conventional methods for removing pollutants from contaminated groundwater.

2. Single-celled green algae of the genus Chlamydomonas can be produced without limit, so sorption resources can be generated without limit.

3. If necessary, by replacing the culture tank with fresh unicellular green algae of the genus Ramitomonas at regular intervals (usually 2 hours), almost 100% of organic and inorganic compounds can be removed.

Claims (1)

[Scope of Claims] 1. A method for removing pollutants from wastewater containing hydrogen sulfide, methane gas, and organic and inorganic compounds by using unicellular green algae of the genus Chlamydomonas, first at a temperature of 20°C to 21°C.
℃, degassed while exposing to air, and kept the water temperature at 21℃ to 25℃ while blowing air in the growth chamber of Chlamydomonas unicellular green algae Earl Sager Strain 95. While stirring, the algae was grown and pollutants were removed to the green algae. sorption,
A method for removing pollutants from wastewater containing hydrogen sulfide, methane gas, and organic and inorganic compounds by using single-celled green algae of the genus Chlamydomonas, which is then filtered through a filter bed. 2. Sulfurization using Chlamydomonas genus unicellular green algae according to claim 1, wherein the filtered water is brought into contact with ozone, and the P-separated green algae is collected by backflowing normal water and dried. A method for removing pollutants from wastewater containing hydrogen, methane gas, and organic and inorganic compounds.