Product Introduction

Wastewater treatment agents
Nippon Hyomen Kagaku Kabushiki Kaisha R & D center

Introduction

Product Summary

Industrial wastewater contains various substances such as

As for industrial wastewater containing heavy metals, thereorganic substances and heavy metals, and it is necessary to

is a neutralization aggregation method as the most common

separate and remove the pollutant components because thewastewater treatment method, and a wastewater treatment

wastewater causes environmental destruction when theprocess as shown in Figure 1 is performed in a plating

wastewater is directly flowed into rivers and the sea. Wefactory. The wastewater treatment agents of JASCO haveprovide optimum treatment agents and treatment facilities

lined up heavy metal scavengers, coagulation aids, polymer

for various wastewaters.

flocculants, defoaming agents, etc. mainly used in pH
adjustment tanks or coagulation tanks. (Table 1)
Heavy metalscavenger
Coagulation aid

Acid/alkaline
wastewater

Polymerflocculant
Discharge

Acid/alkaline
wastewater
reservoir

Preliminary pH
adjustment tankpH adjustment
tank

Coagulation
tank

Neutralization
tank

Settling tank

Discharged water
monitoring tank

Figure 1: Wastewater Flow Diagram1 (acid/alkaline)
Table 1: Major Wastewater Treatment Agents of JASCO
PurposeType

Aluminum
Coagulation
aids(inorganic)

Calcium
Magnesium
Other

Coagulation
aids(organic)

Dicyandiamide
Melamine
Inorganic

Heavy metal
scavengers

Organic
Inorganic organic
mixtureProduct name
W-803
W-814
W-850B
P-0415
W-801
M-0604
7H049

PurposeType
Cationic

Polymerflocculants

Anionic

7D012
W-840
7G039
K-0403
M-09257F033
W-850A
W-856
7F025

Nonionic
Defoaming
agents

SiliconReducingagents

For hexavalentchromium

Product name
W-830
7F026
W-835W-836 (medium anion)
W-837 (emulsion type)
W-1200A (strong anion)
7F030 (medium anion)
7F031(low-priced of W-835)
7M054 (strong anion)
7G046
Defoaming agent S
Defoaming agent R (solid)
7G036
W-822
W-825

W-855

20221021 JASCO Nippon Hyomen Kagaku Kabushiki Kaisha 1

[Product Introduction] Wastewater Treatment Agents

Treatment process

Mechanisms

Depending on the components of the wastewater, theMetal ions other than hexavalent chromium have regions

treatment is divided into cyanogen, chromium, andwhere hydroxide is formed and the solubility decreases.

acid/alkaline. The treatment process of the acid/alkaline is

Solid-liquid separation of wastewater is facilitated byas shown in Figure 1. In addition to this, a decomposition

utilizing this precipitation range. Basically, wastewater

step of cyanogen is required in the case of cyanogen, and acontaining heavy metals is treated using neutralization

reduction step of chromium is required in the case ofaggregation. (Figures 2 and 3)

chromium. For the components in Table 2, it is necessary toseparately treat or dilute them. (except for the substances 1Aggregation assistance
Colloidal
コロイド粒子particles

and 2 in Table 2)1
Table 2: Wastewater and Concentrated Waste Liquidcontaining Components that Need Separate Treatment
12345678

Add raw water
Raw water

Add raw water
into the beakerof about 300 to
500 mL until
its 80 percent
full.

Trivalent chromium
Nickel-cyanide complex
Complexing agent (chelating agent)High COD, BOD
Oil, Surfactant
Fluorine (especially Borofluoride)
Hydrogen peroxide
Nitrogen, Phosphorus
Primary pHadjustment(pH2.0 to 3.0)

Secondary pHadjustment(pH9.0 to 11.0)Aggregation 1

Sulfuric acid

Caustic soda

Polymer flocculant

pH meter

pH meter

Set the agitator
and pH meter.
Normally,
about 10%
dilute sulfuric
acid is addedwith the targetof pH 2.5.

About 10%
caustic soda isadded with thetarget of pH
10.0.

Take out thepH meter andadd 2 to 5
mL/L of 0.05
to 0.1%anionicpolymer
flocculant.

凝集補助(無機・有機助剤)(inorganic/organic
coagulation aids)

微小フロック
Small flocs

Aggregation assistance,
凝集補助・吸着・架橋
adsorption/cross-linking(無機・有機助剤，高分子凝集剤)(inorganic/organic
coagulation aids, polymerflocculants)
Coarse grain
粗粒・細粒Fine grain

吸着・架橋

Adsorption/cross(高分子凝集剤)
linking(polymer flocculants)

Adsorption/cross-linking(高分子凝集剤)(polymerflocculants)
吸着・架橋

粗大フロック
Large flocs

Figure 2: Process of Floc Formation

Aggregation 2

Solid-liquid
separation

Analysis
1. hexavalent chromium
Determine the filtrate by packtest or diphenylcarbazide
absorption spectrophotometry.

Immediately
after adding
the polymer
flocculant, stirstrongly for 10
seconds, stir
weakly for 60
seconds, stop
stirring, and let
it stand for 10
minutes.

After 10minutes, checkthe SV(volume ofsludge (%))
and filter thesupernatant
through a very
coarse paper orcloth to collectthe filtrate.

2. zinc, total chromium,copper, nickel, etc.
Bring the filtrate to an acidic
atmosphere with nitric acid orhydrochloric acid for heavy
metal determination, andmeasure by pack test or atomic
absorption spectrophotometry.

Figure 3: Example of Neutralization Agglutination Experiment

In closing
In wastewater treatment, inflow control is important, andLiterature

fractionation and treatment according to the components of

1: Japan Surface Finishing Suppliers Association

wastewater are necessary. For actual industrial effluent,kankyoutaisakuiinkai

sufficient verification is necessary in many cases where themekkihaisuisyorisisetunohyouzyunnsiyousisin, 5, 53-54

basic flow alone does not work. JASCO has developed and(2012)

offered various wastewater treatment agents such as heavy
metal scavengers, coagulation aids, polymer flocculants,
and defoaming agents based on previous experience.
20221021 JASCO Nippon Hyomen Kagaku Kabushiki Kaisha 2