No. QS3150

Decomposition Test Result of Chlorine Organic Compound by
ExcimerLamp222

PeriodApril 16th,1998 to April 27th,1998
LocationKanagawa Industrial Technology Research Institute

Quark Systems Co.

* System Outline

Light source : Quark's Excimer Lamp 222nm Dia.18mm x L290mm One
Lamp power : 50W x 1
Irradiation Intensity : Apr.10mWcm2
Quartz Tube : Corning 7940, Transitivity 86%
Pomp : Iwaki Corp Magnet Pomp MD-15R
Tank material : Stainless Steal steel
Tank: 2.7 L.

* Tested material• Trichloroethylene• 1.1.1-Trichloroethan• Chloroform• Nitride group ion, Nitrite group1. Trichloroethylene
Flow: 4.8 lmin
Solution of silver nitride : silver nitride 0.5g dissolved into 100cc distilled water
Measuring point : before irradiated, 1 min, 2min, 3 min, 5 min, 10 min, 20min
Test method : Quantitative analysis by gas chromatograph mass spectrometry (GC-MS)

Time / Parameters

pHORP in mV

Silver nitrate

Before irradiation

7.34

531

1min

5.65

538

Oxidation reaction

289.532

2min

no datano datano data

235.692

3min

5.3557267.997

5min

4.5593235.625

10min

3.9627201.095

20min3.61662

108.626380.261

ppm

Trichloroethylene
400
350
300
250
200
150
100
50
01 min. 2 min. 3 min. 5 min.
tDensity, ppm

10min.

20min.

2.

1.1.1-TrichloroethaneFlow
4.8 lminSilver nitride solution : Silver nitride (0.5g) dissolved into 100cc distilled water
Measuring point : before irradiation, 15 sec, 30 sec, 1min, 2 min, 3 min, 5 min, 10 min, 20 min
Test method : Quantitative analysis by gas chromatograph mass spectrometry (GC-MS)

Time/Parameters

pHORP, mV

Silver nitride

Before irradiation

7.836715 sec7.15418

30 sec7.11

414422.585

1 min

7.08

424

375.139

2 min

6.89

440

299.954

3 min

6.76

446

337.263

5 min

6.57

434

293.525

10 min6.23

465

266.090

20 min5.39

478

160.764434.902
Oxidation reaction

1.1.1-Trichloroethane
500
400
ppm

300
200
100
01/4 1/2

12

3

5

1020

min.

min

min

min

min

min

min

min

tDensity, ppm

365.303

3. Chloroform
Flow
4.6 lminSolution of silver : nitride silver nitride 0.5g dissolved into 100cc distilled water
Measuring point : before irradiated, 1 min, 2 min, 3 min, 5 min, 10 min, 20min
Test method: Quantitative analysis by gas chromatograph mass spectrometryGC-MS

Time/Parameters

pHORP, mV

Silver Nitrate

Density, ppm

Before irradiation

7.3

548

15 sec6.40

558

30 sec6.24

570

1285.625

1 min

6.15

560

1278.352

2 min

5.85

581

1203.784

3 min

5.54

594

994.404

5 min

4.97

617

1070.438

10 min4.20

675814.252

20 min3.84

710

788.14230 min3.59

724

784.349

1184.159
Oxidation reaction

Chloroformppm

1500
1000
500
015sec 30sec 1min 2min 3min 5min 10min 20min 30mint

1271.765

4. Nitrate group ion
Flow 4.8 lmin
Measuring point : before irradiation, 5min, 10min, 15min, 20min, 25min, 30min, 45min, 60min
Test method : Absolute calibration curve analysis by ion chromatograph Analyzer (IC)Time/Parameters

pHORP(mV)

Before irradiation

5.21

5 min.

Density, ppm

Temperature

NO2-NO3-(Celsius)

592

4.755

9.480

22

5.35

592

4.742

9.320

22

10 min.

5.46561

4.870

9.473

22.5

15 min.

5.33

573

4.856

9.610

2320 min.

5.28543

4.930

9.465

2325 min.

5.305484.686

9.339

23.5

30 min.

5.24

541

4.933

9.455

2445 min.

5.36

526

4.895

9.291

2560 min.

5.24

532

5.039

9.347

26--NO2 /NO312ppm

1086
420t

N/NO3- = 14/62 = 0.226

NO3- 1000ppm

10ppm

N/NO2-= 14/46 = 0.304

NO2- 1000ppm

5ppm

N=226ppm

2.26ppm Density x 2.26 = Nitrogen Nitrate Density.
N=304ppm

1.52ppm

Density x 1.52 = Nitrogen Nitrate Density

* Test Method•Trichloroethylene, 1.1.1-Trichloroethan, Chloroform.
1Inject dosage of substances into 3 litter of distilled water, then disperse and saturate it byultrasonic.
2Circulate the saturated solution in the equipment with pomp, and obtain a sample from thesolution before irradiation.
3Sample at the each plot points with counting irradiation time.
4
Measure pH and ORP of samples, and study reactivity by silver nitrate.
5Obtain analysis samples with hexane, analyze it with GC-MS after the test.
5-1 Make 1000ppm standard sample, analyze it with GC-MS, make thecalibration curve.
5-2 Conduct quantitative Analysis of samples below with GC-MS as new samples.

• NO3NO2
1. Pour NO3- 30ml and NO2- 15ml into 3 litter distilled water, and make NO3- 10ppm and NO25ppm solution.
2. Circulate saturated solution in the system with pomp, sample it as a solution before irradiation.
3. Sample at the each plot points with counting irradiation time.
4. Measure pH, ORP of samples, and put a thermometer into the testing sample container, andconduct thermometry.
5. Analyze it with IC right after the test.
5-1 Make NO3- 20ppm and NO2- 5ppm as standard samples, analyze it with IC, and makecalibration curve.
5-2. Conduct absolute calibration curve analysis with IC, as unknown samples.

* Test Result
As you can see on the analysis data, it does not have uniformity, because this was the first test as an actual
water treatment system, and had some flaw on the test process.
However, as a good result, trichloroethylene and trichloroethane density became 1/3 in 20 minutes,
compared to these before irradiation.
Compared to the graph 1, this result was same as one utilizing combination of titanium oxide film photocatalyst and a super voltage mercury lamps' irradiation.
However, because this test was interrupted in 20 minute, it is not sure how long it takes to decompose thesubstance completely. So, it would be determined in the next test.
As for chloroform, the density declined between 1 and 10 minutes.
After 10 minutes, it remained a certain density.
As a decomposition trial of inorganic compound, the excimer 222 irradiated nitrate group (ion) andnitrite group (ion) for one hour, the density did not changed, so that we could not obtained a good result.
We briefly report that we obtained such results as above from this test. We are planning to utilize theexcimer 172nm in the next test. It will be conducted under same condition, and utilize same substances.

* Feature order of businessWe would like to use experience, knowledge, and advice from experts in this test for tests in the feature.
Our assignment
1
Making solution, which set substance density.
2Longer irradiation time.
3
Maintaining the whole system clean and cleaning of containers.
4
Adequate flow and sampling method.
5
Analysis for wide range of substance such as by-products.
6
Improvement of sealing degree for the whole system in order to consider safety for the gas
7
Utilizing 172-nm center wavelength as illuminant.
Improvement of irradiation unit.
* Reference
1. Hiroshi Tougeda, Eiji Watanabe, Kazumi Kato : Race and Drainage, Photo Catalyst treatment withfilm catalyst for chlorinated organic compounds, April 1996.