綠工科技有限公司 Green Works Co., Ltd.80672高雄市前鎮區擴建路 1-23號 11樓 11F.,No 1-23,Kuojian Rd.,Kaohsiung City 80672,Taiwan.R.O.C

統一編號: 5359 3262 TEL: +886 (0)7 841 3105, FAX: +886 (0)7 811 8391

綠 工 科 技 有 限 公 司

Green Works Co., Ltd

統一編號：53593262

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Oxidation time [min]

Typical response curves

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GreenMon Analyzer for Chemical Oxygen Demand ( COD ) The Photometer Chemical Oxygen Demand ( COD ) version of the GreenMon system comprises the following equipment:

Analyzer unit, control and measurement electronics made by the German Company GO.

Installation in the Stainless Steel cabinet with a color touch display, the chemical application, design of reagents and programming is done by

GreenWorks. . Number of probe channels: 1.

Procedure :

A sample of the water is mixed with the digestion solution and than for a given time treated in the Digestor to oxidize the Organic Carbon in the

sample. Digestion time is adjustable to ensure the highest possible recovery.

After the digestion the sample is cooled and then the color is measured in the photometer.

The result is compared with the calibration ( typically done with Potassium hydrogen phthalate ) and the calculated COD value is displayed.

The method follows the ASTM D 1252, USEPA method 410.4 and APHA method 5220 D method which is the mostly accepted and used method

in laboratories worldwide and also in Taiwan. Interferences of Chlorides (Cl-) up to 1,000 ppm are compensated with a complexing reagent.

The smallest standard measuring range is 0 - 100 ppm and the high standard range is 0 - 500 ppm. Lower or higher ranges are possible as an

option. The accuracy of the measurement follows the EPA law of Taiwan or better depending on the sample matrix.

Chemistry of COD measurement:

CaHbOc + Cr2O72-

+ H+

Cr3+

+ CO2 + H2O

Organics Cr6+

Acid 3 6

2

CrtoCrofreduction

COtoOrganicsofoxidationCr

3+ + CO2 + H2O

There are two approach ways:

Oxygen is an important essential in the environments. If a water body is carrying excessive amounts of waste materials, the oxygen will be consumed and damage the living species in the water. This is important for the effluent of a waste water treatment plant to protect the environmental waters like rivers and lakes. But it is also important to know the COD value in the inlet of a waste water treatment plant to protect the Biological treatment from being disturbed. Various accepted methods were issued out for determining the consumption of oxygen, include Biochemistry Oxygen Demand(BOD), Chemical Oxygen Demand(COD) and Total Oxygen Demand(TOD) . The time required for BOD testing normally needs 6 days, which is it’s disadvantage.

Chemical Oxygen Demand, COD was introduced as an analytical method in an effort to reduce the inaccuracies of BOD and to provide a wastewater indication in a period of 2 hours or less. The definition is “ The quantity of oxygen that certain impurities in water will consume, bases on the reduction of a dichromate solution under specified condition.”

30 minutes to 2 hours reaction time make the Dichromate COD a valuable tool for analysis comparing to 5 days of BOD. Dichromate COD is the most popular governmental standard for laboratory tests in the world including Taiwan. GreenMon Analyzer for Chemical Oxygen Demand is following this standard, operating an automated, continuous and reliable On-line COD analyzer.

Aliphatic Compounds Acetone 98 Acetic Acid 92 Acrolein 62 Butyric Acid 89 Dextrose 95 Diethylene Glycol 93 Ethyl Acetate 95 Methyl Ethyl Ketone 98

Aromatic Componds Acetophenone 89 Benzaldehyde 80 Benzene 60 – 98 Dioctyl Phthalate 98 Diphenyl 81 o-cresol 95 Toluene 83 Potassium Acid Phthalate 100

(Source : ASTM)

Nitrogen Compounds Acrylonitrile 48 Adenine 59 Aniline 80 Butyl Amine 57 Pyridine 0 Quinoline 87 Trimethylamine 1 Tryptophane 87 Uric Acid 61

Component recovery in %

1. Measurement of the decrease of Cr6+

(Hexavalent Chromium) at 440 nm.For the low concentration measurement below 500 ppm

2. Measurement of the increase of Cr3+

(Trivalent Chromium) at 600 nm.For the high concentration measurement above 500 ppm

Heat , Catalyst

綠工科技有限公司 Green Works Co., Ltd.

80672 高雄市前鎮區擴建路 1-23號 11 樓 11F.,No 1-23,Kuojian Rd.,Kaohsiung City 80672,Taiwan.R.O.C

統一編號: 5359 3262 TEL: +886 (0)7 841 3105, FAX: +886 (0)7 811 8391

綠 工 科 技 有 限 公 司

Green Works Co., Ltd

統一編號：53593262

Specification Of Chemical Oxygen Demand ( COD )

Function

Wet Chemistry Analyzer for Chemical Oxygen Demand(COD)

Following the standards of ASTM D 1252, US EPA METHOD 410.4

APHA method 5220D

Display Touchpanel, LCD color graphic display

Measuring Range 0~100 to 0~500 ppm (more high concentration can be option)

Precision with standard solution (>1 ppm): +/- 5% of measuring range

Repeatability with standard solution (>1 ppm): +/- 3 % of measuring range

Response Time Adjustable from 1 minutes to 5 hours

Sample Temperature 1 to 50℃

Ambience Humidity 0 to 99% non condensing

Bypass Flow 50 - 1,000 cc/min

Consumption Approx. 15 ml / analysis nominal

Reagent Supply typ. 12 weeks depending on range (life time : min. 30 days)

Output Signal 0/4-20 mA max. load 500 OHM characteristic curve: linear / logarithmic galvanically isolated

Interfaces USB / Ethernet Option: modem: analog, GSM, ISDN Profi Bus DP,RS485..

Relay Contacts 6 potential free contacts free allocable (e.g. alarm contact)

Digital Inputs 2x Digital In

e.g. activating and deactivating of measuring points, system control

Power Supply 85…264 VAC at 47…63 Hz

Environmental Temperature

15 - 35°C (288 - 308 K)

Installation Free standard shell housing option wall-mounted

Weight Housing with reagent cabinet 60 - 80 kg without reagents

Dimensions

(height×width×depth) Material: SUS316 , Housing: 1450x600x400 mm

High Temp Digestion

Digestion temperature can be adjusted to max 200˚C

Digestion time can be adjusted from 1 to 200 min

Digestor is temperature isolated and protected with a SS housing

Fluid transport Reagents are transferred with piston pumps.

Corrosive resistant materials for pump and piping are selected

Alarm functions

Leakage of reagents or sample are detected with the leakage detector

In case of Leakage Alarm relay will be switched and operation stopped

Missing sample due to no sample or dirty tubings will be detected and gives an alarm