JPS58137492A - Method for removing color of water - Google Patents

Abstract

PURPOSE:To efficiently remove the coloration of water and to remove dissolved iron, manganese, etc., by using the particles of electrolytic manganese dioxide as the catalyst to remove the color of naturally colored water derived from humic acid, fulvic acid, etc. CONSTITUTION:An ozone-reacting column 2 is provided in front of a filtering tube 1, a part 5 for injecting pressurized air, a part 6 for adding NaClO and a part 7 for adding a flocculant are provided in a line 4 leading to the filtering tube 1, and the filtering tube 1 is packed with a catalytic filtering agent (particles of electrolytic manganese dioxide) 8. If the load of the color of raw water is very high, the raw water is treated in the ozone-reacting column 2, mixed with 2ppm NaClO as an oxidizing agent and 5ppm poly(aluminum chloride) as a flocculant and then let flow through the catalytic filtering agent in the filtering tube 1. According to this method, the amount of chemical agents to be injected can be saved by about 1/100, and the amount of sludge is made small below 1/100 as compared with a conventional method using a flocculant.

Description

[Detailed Description of the Invention] Conventionally, in removing natural chromaticity due to humic acid, fulvic acid, etc. in well water, etc., I) H reduction and coagulation effect by adding a large amount of flocculant such as aluminum salt and pretreatment from 7. However, it has the disadvantage of generating a huge amount of dirt (1) and increasing cost, and removing the color of naturally colored water has been a challenge during water treatment.

This invention is applicable to the operation of completely removing iron and manganese dissolved in deep well water, etc., by using highly active manganese oxide as a catalyst and in the presence of an oxidizing agent such as chlorine. Apparently, electrolytic manganese dioxide has a particularly high activity as a manganese catalyst, so we investigated the possibility of applying this to the removal of color in humic substances, and obtained the results. .

As is well known, the electrolytic manganese dioxide used in the method of this invention is produced by electrolyzing manganese sulfate or manganese chloride made from manganese ore, and is composed of γ-type manganese dioxide with high pure K and free of bound water. It is a highly active compound containing ``9''.

Next, the method of this invention will be explained in comparison with a conventional method using manganese sand using naturally colored water.

As shown in the attached drawing, the equipment is mainly composed of the offshore tube 1, and if the chromaticity load is extremely high, ozone treatment may be performed, so the ozone treatment is carried out before the offshore tube 1. A reaction column 2 is provided, but this is not relevant to the practical data presented below.

A pressurized air injection section 5, a NaC10 addition section 6, and a flocculant addition section 7 are provided in the thread path 4 leading from the raw water tank 3 to the filter tube 1, and a contact catalyst F agent 8 is provided in the filter tube 1.
is loaded.

The inner diameter of the above filter cylinder L is 100 mm, the door height is 1500 cm, electrolytic manganese dioxide is used as the p agent, manganese sand effective diameter is 0.4.3 tiles, and the coagulation uniformity coefficient is 059.
1.40 1.60 Water flow condition S V = 21
/HhLV=3 (1m/H5 test water (for raw water) Humic acid-based colored water contains a small amount of iron and manganese, but the amount is not large enough to affect the chromaticity.

First, add 2 pprl of sodium hypochlorite to raw water as an oxidizing agent.
, 5 ppm of polyaluminum chloride is added as a coagulant.

Tables 1 and 2 compare the treatment of this rL2 electrolytic manganese dioxide catalyst agent and the conventional manganese sand P agent. Note that residual chlorine of 05 to 1.0 ψ was present in the filtered water.

(5) In the above example, sodium chlorate was used as the oxidizing agent, but there are some problems with using ozone as the oxidizing agent.
In some cases, pressurized air injection is used to remove the concern about trihalomethane formation, which is advantageous, or to increase the amount of dissolved oxygen in the water.

This invention is carried out as described above, but is this? Compared to conventional flocculants, the amount of chemical injection is approximately 1/1
100, therefore the amount of sludge is less than 1/100, and the removal effect of dissolved iron and manganese is also excellent despite being a result of heat quenching, making it an extremely effective method for treating naturally colored water.

[Brief explanation of drawings]

The accompanying drawing is a system diagram of the apparatus in which the entire method of the invention is carried out. (6) In the figure, 1 filter cylinder 2 ozone reaction tower 3 raw water tank 4 system line 5 pressurized air introduction section 6 NaC-0 addition section 7 flocculant addition section 8 contact catalyst reactor. Patent applicant Suido Kiko Co., Ltd. (7) 551

Claims (1)

[Claims] In a method for removing dissolved substances in water as a highly active manganese oxide total catalyst, electrolytic manganese dioxide particles are used as the manganese oxide, and humic acid and fulvic acid are used to remove the chromaticity of naturally colored water. A method for removing chromaticity of water, characterized by performing the following steps.