JPH0483589A - Purification of sewage - Google Patents

Abstract

PURPOSE:To almost perfectly remove the contaminant in living waste water of every kind by separating a settled pulp fiber having contaminant fixed thereto in an hydrous state into moisture and the pulp fiber having the contaminant fixed thereto by centrifugal separating action to extract moisture. CONSTITUTION:Sewage 4 is supplied to a beater 1 and old paper pulp is beaten while compressed air of about 5 kg/cm<2> is introduced into the beater 1 to increase the surface area of a pulp fiber. During beating, a binder composed of rubber latex and a flocculant composed of a trivalent metal salt such as Al2[SO4]3 are added to sewage 4. The rubber latex is fixed to the surface of the pulp fiber along with the contaminant of the sewage 4. The pulp fiber having the contaminant fixed thereto is settled to the bottom part of the beater 1 and supernatant water 4A is stored in the upper part of the beater as primary treated water and mixed with the water 6 extracted from a centrifugal separator 2 to be introduced into a storage tank 3 as primary treated water 8. After oxygen is blown in the primary treated water 8, said water 8 is brought into contact with powder of a far infrared ray emitting ceramics to generate exciting reaction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for purifying sewage, and in detail,
The present invention relates to a resource reuse type wastewater purification method in which pollutants contained in wastewater are removed by being attached to the fiber surface of waste paper pulp in an agglomerated state.

[Conventional technology]

Various physical or physicochemical sewage treatment methods as a means of preventing pollution of rivers, lakes, or sea areas, or
Biochemical wastewater treatment methods such as aerobic treatment methods and anaerobic treatment methods are known.

For example, gray water discharged from households contains considerable amounts of fats and oils and phosphorus, which have a negative effect on the biochemical oxygen demand (BOD) of river water, lake water, and marshes, so they are absorbed and solidified. Measures to prevent contamination are being implemented, such as using separation and recovery methods such as phosphorus-free detergents and soaps.

The biochemical oxygen demand (BOD), which is one of the indicators of water pollution, is the amount of dissolved oxygen consumed by aerobic microorganisms to decompose organic matter in water within a certain period of time under aerobic conditions. DO), which corresponds to the amount of biodegradable organic matter in rivers or freshwater lakes and marshes. For example, if BOD I PPm or less, it means that the water quality standards are extremely clean and can be drunk as is, and if BOD 3 PPm or less, it means that the water quality is moderate enough for most freshwater fish to live in. water quality standards are maintained. Generally, BOD 5 PP
+n is said to be the limit value for pollution in water quality management. Note that if the water contains salts, the growth of microorganisms will be inhibited by the salts, making BOD measurement impossible.

On the other hand, chemical oxygen demand 1 (COD>) is
One of the indicators of the organic matter content in river water or lake water.
, for 30 minutes), and the amount of oxidizing agent (potassium permanganate) required for this was adjusted to the equivalent amount of oxygen (Oz mg/
1). COD is widely used as an environmental standard value for sea areas such as ports, rivers, and brackish water lakes because COD can be measured only on a regular basis. However, the degree of oxidative decomposition varies depending on the type of organic matter, and the is involved in the measurement, so what the COD value indicates is not necessarily clear.

Taking these circumstances into consideration, BOD is generally used as the water quality standard value for rivers or lakes into which domestic wastewater flows.

[Problem to be solved by the invention] Gray water discharged from kitchens in ordinary homes contains living organisms such as chlorine and phosphorus! If these pollutants are discharged into rivers or lakes without being separated and collected, the proliferation of phytoplankton will be accelerated, causing freshwater red tide. To explain in more detail, after multiplication, dead phytoplankton carcasses, fish and shellfish, or shellfish feces are deposited on the bottom of the lake, and as they decompose, tin and phosphorus are leached out and accumulated as nutrients. By repeating this vicious cycle, the phenomenon of eutrophication of river water and lake water progresses. Phytoplankton also has the property of adsorbing highly toxic organic compounds such as mercury, cadmium, and lead, in addition to tinnic acid and phosphorus, if the water contains them. For this reason, when dead phytoplankton that have ingested tin, phosphorus, and the above toxic substances are deposited in Odaiai, river water and lake water not only turn into sludge and deteriorate water quality, but also turn these rivers and lakes into water sources. For example, it can cause pollution-related diseases such as Itabi-itai disease to occur in the residents of the basin where they are used as water. On the other hand, recycling of waste paper pulp has been proposed as part of measures to effectively utilize paper resources. However, the methods used so far have been used only for recycled paper, and no consideration has been given to its application to wastewater purification technology.

[Means to solve the problem]

As a means for solving the above problems, the present invention provides a step of beating the waste paper pulp in a state in which about 3 parts by weight or more of the waste paper pulp is mixed with 11 parts of waste water to increase the surface area of the pulp, and during the beating, Alternatively, a process of adding a binder to the pulp-containing wastewater of waste paper after beating and fixing the pollutants contained in the wastewater on the surface of the pulp fibers, and a process of fixing the pollutants contained in the wastewater during the above process or after the completion of the above process. A flocculant is added to the slurry-like treated water generated by the fixation of the pollutants, and the pulp fibers with the contaminants fixed thereon are sedimented.
A step of extracting the supernatant liquid, and a step of separating the water-containing valve fibers, which have fixed contaminants and settled, into pulp fibers with fixed contaminants using centrifugal separation, and extract the moisture. A sewage purification method comprising: increasing the amount of dissolved oxygen by adding oxygen to a mixture of the supernatant liquid and water extracted by centrifugation; and bringing a far-infrared emitting ceramic into contact with the mixture; The present invention provides a wastewater purification method that causes an excited reaction in the water to be treated and imparts activation energy to the water to be treated.

[Effect]

Used paper materials are deinked to remove ink, vinyl coatings, etc., and the waste paper pulp fibers are used as a wastewater purification medium. Sewage, e.g. gray water 1
The above-mentioned waste paper pulp is beaten in a state in which about 3 parts by weight or more of waste paper pulp is mixed into the waste paper pulp to increase the surface area of the pulp fibers. During beating or at the end of beating, a binder consisting of rubber latex and a trivalent metal salt, such as Af2 (S04
) A is added to fix the contaminants contained in the wastewater on the surface of the pulp fibers, and the pulp fibers with the contaminants attached are allowed to settle at the bottom of the beating machine. The pulp fibers, on which contaminants have settled and settled, are fed to a centrifuge, and water is separated using centrifugal action. The pulp fibers with pollutants fixed thereon are then incinerated to become residual ash, which is mixed into, for example, plastics, cement, etc., and reused as building materials.

On the other hand, the amount of dissolved oxygen (D
o) increase. In addition, by bringing fine powder of far-infrared emitting ceramics into contact with the above-mentioned secondary treated water,
Causes an excited reaction and increases activation energy.

This treated water is discharged into rivers and lakes as secondary treated water that meets environmental standards.

〔Example〕

FIG. 1 is a cutaway front view of a sewage purification apparatus used for carrying out the method of the present invention. In the figure, (1) shows a waste paper pulp fiber beating machine, (2) a centrifugal separator, and (3) a storage tank for a liquid to be treated.

Two types of sample water (4) are prepared in which the mixed amount of waste paper pulp is changed in two stages as shown in Table 1 for gray water 11 having BOD 8 PPm discharged from a kitchen.

The above two types of sample water (4) are respectively supplied to the beating machine (1), and the waste paper pulp is beaten while introducing about 5 kg/- of compressed air to increase the surface area of the pulp fibers. During beating, a binder consisting of rubber latex and a trivalent metal salt, for example Aj!, are added to each sample water (4). 2
[504) A flocculant consisting of a 10% solution of a is added. The amounts of the binder and flocculant added are adjusted according to the amount of waste paper pulp mixed, as shown in Table 1.

(Table 1) Before adding the flocculant, the binder is maintained in an emulsified state in which OO ions are balanced. When a flocculant is introduced into the sample liquid (4), the above ionic equilibrium state is broken, and the rubber latex, together with the contaminants in the sample water (4), settles on the surface of the pulp fibers whose surface area has been increased by beating. The pulp fibers with the contaminants fixed on them settle at the bottom of the beating machine (1), and the supernatant liquid (4A
) accumulates. The pulp fibers (5) in a water-containing state that settle on contaminants and settle at the bottom of the beating machine (1) are centrifuged! 8
(2) and separated into water (6) and pulp fibers (5A) on which contaminants have been fixed using centrifugal separation. This pulp fiber (5A) is then subjected to a centrifugal separator (
2) and incinerate it to ashes and reuse it, for example, as a building material.

On the other hand, the supernatant liquid (4A) stored inside the crusher (1)
is mixed with the water (6) extracted from the centrifuge (2) and introduced into the storage tank (3) as second treated water (8).

At this stage, oxygen is blown into the primary treatment liquid (8) to increase the amount of dissolved oxygen (DO), and at the same time, by bringing it into contact with the fine powder of far-infrared emitting ceramic/cus, an excited reaction is caused and the activation is activated. Increase energy. Storage tank (
The treated liquid (9) that has undergone the treatment in step 3) is discharged into rivers or lakes as clear secondary treated water (9) from which almost all pollutants have been removed. CO of sample 1 and sample 2
The results of measuring D on the water to be treated collected in the liquid flow path from the beater (1) and the discharge path from the storage tank (3) are shown in the second table.
Shown in the table.

(Table 2) From Table 2 above, it is understood that Sample 1, in which the amount of waste paper valve mixed per wastewater IE was set to 3 parts by weight or more, maintained good cleanliness. On the other hand, it is understood that sample 2, in which the amount of waste paper valves mixed in per sewage 11 was less than 3 parts by weight, was inferior to sample 1 in cleanliness.

Methods for introducing oxygen into the storage tank (3) include a method of directly blowing oxygen into the secondary treated water (8), and a method of introducing oxygen into the storage tank (3).
．． A method of adding 4 to 10% of a solid oxygen generating agent can also be adopted. The amount of oxygen supplied and the amount of far-infrared emitting ceramic fine powder added are determined by the beating machine (1).
, as well as centrifugation! The COD values of the primary treated water (8) taken out from a (2) and the secondary treated water (9) taken out from the storage tank (3) are adjusted depending on the use, but in general, untreated water It is preferable to add 4 to 10 cc of oxygen and 10 to 15 g of fine ceramic powder per 1000 cc of gray water.

〔Effect of the invention〕

According to the method of the present invention, pollutants in gray water are almost completely removed. In addition, since waste paper valves are reused as a medium for fixing and removing pollutants, it has a remarkable effect on preventing environmental destruction and promoting resource conservation measures.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway front view of the sewage purification device. (1) - Beating machine, (2) - Centrifugal N machine, (3)
-Storage tank.

Claims (2)

[Claims] (1) Beating the waste paper pulp in a state where about 3 parts by weight or more of waste paper pulp is mixed with 1 liter of wastewater to increase the surface area of the pulp, and during the beating, or
A step of adding a binder to the pulp-containing wastewater of waste paper after beating and fixing the pollutants contained in the wastewater on the surface of the pulp fibers, and fixing the pollutants during or after the above step. A process of adding a flocculant to the slurry-like treated water generated by the process, sedimenting the pulp fibers with pollutants fixed thereon, and extracting the supernatant liquid; A sewage purification method that consists of the steps of separating pulp fibers into pulp fibers with moisture and contaminants fixed thereon using centrifugal separation, and extracting the moisture. (2) Oxygen is added to the mixture of the supernatant liquid and the water extracted by centrifugation to increase the amount of dissolved oxygen, and the mixture is brought into contact with far-infrared emitting ceramics, thereby increasing the amount of water to be treated. 2. The method for purifying waste water according to claim 1, wherein activation energy is imparted to the water to be treated by causing an excited reaction.