## MEMORANDUM

**TO:** Steam Electric Rulemaking Record

**FROM:** Dan

- Tam Nguyen

**DATE:** September 30 , 2015

**SUBJECT: Pollutants of Concern Analysis Methodology**  **for FGD Wastewater,**

**Combustion Residual Leachate, and Gasification Wastewater**

ERG is providing technical support to the U.S. Environmental Protection Agency’s Office of Water, Engineering and Analys is Division (EAD) for development of effluent limitations guidelines and standards (ELGs) for the Steam Electric Power Generating Indust ry

. This memorandum describes EPA’s methodology for identifying Pollutants of Concern ( POCs ) in FGD wastewater, combustion residual leachate, and gasification wastewater

.
**1. I** **NTRODUCTION**


### As part of the final rulemaking, ERG review ed characterization data f or untreated FGD wastewater (FGD purge), combustion residual leachate, and gasification wastewater to identify which pollutants are present in the se wastewater s at a sufficient concentration and frequency to be considered treatable

. The pollutants that mee t these criteria are identified as POC s. ERG identified POCs separately for each waste stream. Only pollutants identified as POCs are considered in EPA’s subsequent pollutant loadings and removals evaluations

. This memorandum only

discusses the POC analys es for FGD wastewater, combustion residual leachate and gasification wastewater ; the POC analyse s for fly ash and bottom ash transport water are discussed separately in Bottom Ash and Fly Ash Pollutants of Concern (POC) Analysis Methodology Memorandum (DCN SE04745 )

.
**2. POC**  **A NALYSIS**  

### M**ETHODOLOGY**



### For the proposed rulemaking, EPA conducted the POC analysis by comparing the untreated wastewater sample concentrations to the baseline values that were developed for the 2000 Centralized Waste Treatment (CWT) Industry Effluent Limitations Guidelines [U.S. EPA, 2000; ERG, 2013]. Inresponse to public comments , EPA conducted the analysis for the final rule by comparing sample concentrations to the sample

- specific quantitation limit (QL). In the case of FGD wastewater, combustion residual leachate
, and gasification wastewater
, EPA only used data that included the associated QLs. The QL is often referred to in ELG support documents as the reporting limit. Use of the QL provides a more accurate representation of POCs in untreated wastewater for the following reasons :

### Memorandum

September 30, 2015 Page 2

 The QL i s sample

- specific and can vary for a given pol lutant between samples. The QL provides a direct comparison to the sample result because it accounts for analy tical adjustments made in the determination of the sample result.

 The anal ytical methods used to determine the sample results and QL s are those used for the Steam Electric rulemaking (i.e., EPA Methods 200. 7, 200.8 with collision cell, and 1631E) and are capable of achieving QLs that are lower than the baseline values from CWT for many

priority and nonconventional pollutants ( e.g., arsenic, cadmium, chromium, selenium, magnesium, manganese)

. Incontrast, for example, the CWT baseline values for metals were developed based on instrument detection limits for EPA Method 1620.

EPA used the anal ytical data from the data sources described in Section 3 to identify POCs in each of the wastestreams . EPA reviewed the sample results to identify POCs, which EPA defined as those pollutants detected at greater than or equal to 10 times the QL in at least 10 percent of all untreated wastewater samples for each wastestream

. Using 10 times the QL as a screening threshold ensures the untreated wastewater concentrations are high enough to quantify the degree of pollutant removal resulting from treatment processes
, such as chemical or biological treatment for FGD wastewater

.

**3. D**  **ATA** 

### S **OURCES** 

### U **SED IN TH** **E** 

### POC **A NALYSIS** 


### EPA's data collection efforts produced data sets from EPA and/or industry

- submitted data

sources. This section describes the data sources used in the POC analysis for each of the wastestreams. ERG’s data quality review procedures for the data collected and used by EPA are outlined in Development Memorandum for the Steam Electric Analytical Database for the Final Rule (DCN SE05876). The data are included in the Steam Electric Analytical Database for the Final Rule (DCN SE05359).

**3.1 FGD**  **Wastewater**

EPA evaluated sources of anal ytical data for untreated FGD wastewater, which are summarized in

### Memorandum

September 30, 2015 Page 3

**Table 3** 

**- 1**  **. Summary of Analytical Data for Untreated FGD Wastewater**

. These data sources are further described in Deve lopment Memorandum for the Steam Electric Analytical Database for the Final Rule (DCN SE05876 )

. Because the POC anal ys is compares the sample results to the QL s, ERG reviewed and excluded any sample results that did not include sample

- specific QL s.

### Memorandum

September 30, 2015 Page 4

**Table 3** 

**- 1**  **. Summary of Analytical Data for Untreated FGD Wastewater**

**Data Source Plant Nam** **e Total**  **Number of Sam** **ples Available**  **Number of**

**Samples without QL**  **(Excluded) Number of** 

**Samples Included in**  **POC Analysis** EPA Field Sam pling Program Allen Steam Station 4 0 4

Belews Creek Steam Station 4 0 4 Dickerson Generating Station 4 0 4 Hatfield’s Ferry Power Station 4 0 4 Keystone Generation Station 4 0 4 Miami Fort Station 4 0 4 Pleasant Prairie Power Plant 4 0 4 Brindisi Power Plant (Italy) 2 0 0 a Monfalcone Power Station (Italy) 1 0 0 a EPA CWA 308 Monitoring Program Allen Steam Station 4 0 4

Belews Creek Steam Station 4 0 4 Dickerson Generating Station 3 0 3 Hatfield’s Ferry Power Station 4 0 4 Iatan 4 0 4 Keystone Generating Station 4 0 4 Miami Fort Station 4 0 4 Pleasant Prairie Power Plant 4 0 4 EPA Data Request Miami Fort Station 58 7 51

Keystone Generating Station 122 0 122 Allen Steam Station 127 See note b 0 Belews Creek Steam Station 138 See note b 0 Cliffside Steam Station 51 51 0 Mountaineer Plant 16 0 16 Steam Electric Public Comment s on the Proposed Rulemaking Pleasant Prairie Power Plant 159 0 159

North Carolina Data Request Roxboro Steam Plant 54 54 0

Duke Energy Data Request Allen Steam Station 64 See note b 0

Belews Creek Steam Station 73 See note b 0

a

– EPA samples from Brindisi and Monfalcone were not used in the POC analysis because they are not representative of plants operating within the United States. b

– Only non

- detect samples had reported sample Q Ls. EPA determined that excluding only the detected samples which did not include sample Q Ls would skew the results of the POC analysis; therefore, EPA excluded the entire analytical data sets for these plants.


### In summary
, EPA’s data set used to identify POCs in untreated FGD wastewater included :

 EPA Field Sampling Program

. EPA included four sample s of untreated FGD wastewater from seven steam electric power plants operating FGD wastewater treatment s ystems for a total of 28 samples . Sample results include 38 analy tes, including priority, conventional, and nonconventional pollutants

.

### Memorandum

September 30, 2015 Page 5

 EPA CWA 308 Monitoring Program. EPA included data from eight plants that each

collected three

- to four

- day samples of untreated FGD wastewater

. The data set included a total of 31 samples with sample results for 37 anal ytes, including priority, conventional, and nonconventional pollutants

.

 Steam Electric Public Comments on the Proposed Rulemaking. EPA included anal ytical data for untreated FGD wastewater from one plant that submitted results for a total of 159 samples, including data for the priority pollutants arsenic, mercury
, and selenium

. 1



###  EPA D ata Request

. EPA included anal ytical data for untreated FGD wastewater from three plants for a total of 1 89 samples , including results for the priority and nonconventional pollutants

.
**3.2 Combustion Residual Leachate** 
As part of industry

responses to the Questionnaire for the Steam Electric Power Generating Effluent Guidelines (Steam Electric Survey) (DCN SE05903)
, EPA received anal ytical data for 3 22 sample s of combustion residual leachate (from landfill and impoundment leachate management units)

.

1 EPA also received data from Duke Energy and the Utility Water Act Group (UWAG) through public comments that overlapped with a subset of the data received through EPA ’s data request. See Development Memorandum for the Steam Electric Analytical Database for the Final Rule (DCN SE05876) on EPA’s data source review and exclusion of duplicative data.

### Memorandum

September 30, 2015 Page 6

Table 3

- 2 . Summary

of Analy tical Data for Combustion Residual Leachate

summarizes the plants that provided analytical data for this wastestream . Upon further review of the data , EPA excluded samples that represented retired combustion residual leachate management units (49 samples) because the data are not representative of the wastestream regulated b y the final rule. Additionally, EPA excluded several samples where the sample QL s
were not available (31 samples)

.
In summary
, EPA’s data set used to identify POC s in combustion residual leachate included data from 33 steam electric power plants with analy tical results for 30 anal yt es from 24 6 samples ( 173 landfill leachate samples and 7 3 impoundment leachate samples).

### Memorandum

September 30, 2015 Page 7

**Table 3** 

**- 2**  **. Summary of Analytical Data for Combustion Residual Leachate**

**Managem ent**  **Unit Plant Nam** **e Total**  **Number of Samples**  **Available Number of** 

**Samples from Retired**  **Managem ent**  **Units (Excluded)**  **Number of**

**Samples without QL**  **(Excluded) Number of** 

**Samples Included in**  **POC Analysis**  Landfill Gibson Generating Station 12 0 12 0

Albright Power Station 20 12 2 6 W. H. Sammis Plant 4 0 0 4 James River Power Station 4 0 4 0 Yorktown Power Station 4 0 0 4 Rivesville Power Station 4 0 0 4 Interstate Power and Light

- Sutherland Generating Station 4 4 NA 0

New Castle Power Plant 4 0 0 4 EME Homer City Generation L.P. 8 0 0 8

Conesville 8 0 3 a 8 Danskammer Generating Station 4 0 0 4

Walter C Beckjord Station 8 4 0 4 Cayuga 4 0 4 0 Marshall Steam Station 4 0 0 4 Merom Generating Station 8 4 0 4 AES

– Somerset 9 9 NA 0 Mountaineer Plant 4 0 0 4 Clover Power Station 4 4 NA 0 Plant Crist 10 0 0 10 General James M. Gavin 12 0 0 12 JH Campbell Power Plant 8 0 0 8 Walter Scott Jr. Energy Center 16 0 1 b 16 Pirkey 4 0 0 4 Harrison Power Station 24 0 0 24 Dunkirk Generating Plant 5 0 1 b 5 Hatfield's Ferry Power Station 8 0 0 8 John Sevier 4 0 0 4 Belews Creek Steam Station 8 0 0 8 RRI Energy Inc. Portland Generating Station 4 0 0 4

Mount Storm Power Station 12 4 0 12 Surface Im poundment Rivesville Power Station 4 0 0 4

Cliffside Steam Station 12 8 0 4 Bruce Mansfield Plant 8 0 0 8 Ghent 4 0 0 4 Walter C Beckjord Station 4 0 0 4 Cayuga 4 0 4 0 General James M. Gavin 4 0 0 4 Philip Sporn 16 0 3 13 Big Sandy 8 0 0 8

### Memorandum

September 30, 2015 Page 8

**Table 3** 

**- 2**  **. Summary of Analytical Data for Combustion Residual Leachate**

**Managem ent**  **Unit Plant Nam** **e Total**  **Number of Samples**  **Available Number of** 

**Samples from Retired**  **Managem ent**  **Units (Excluded)**  **Number of**

**Samples without QL**  **(Excluded) Number of** 

**Samples Included in**  **POC Analysis**  Surface Im poundment (continued) Widows Creek 8 0 0 8

Buck Steam Station 4 0 0 4 Shawnee 4 0 0 4 Johnsonville 4 0 0 4 Belews Creek Steam Station 4 0 0 4 RRI Energy Inc. Portland Generating Station 2 0 2 0

Note: Samples from retired units are excluded from the POC analysis.

a

– All samples contained QLs with the exception of three sample results for one pollutant. EPA excluded these sample results from the POC analysis. b

– All samples contained QLs with the exception of one sample result for one pollutant. EPA excluded this sample result from the POC analysis.



### 3.3 **Gasification Wastewater**
During EPA’s field sampling activities, EPA collected 20 gasification wastewater samples for 37 analy

tes f rom two plants: Polk Power Station and Wabash River Station. Gasification wastewater from these plants includes the following wastestreams: neutralized weak acid wastestream , vapor compression evaporator influent, c ompression evaporator influent
, RCC ® evaporator influent, sour water treatment influent , and steam stripper effluent. All 20 samples included sample QL s and were included in the POC analysis for gasification wastewater.

**4. R** **ESULTS OF** 

### POC **A NALYSES** 


### Using the methodology

outlined in Section 2 , EPA conducted separate POC anal ys es for each of the wastestreams.

**4.1 FGD Wastewater** 

### Memorandum

September 30, 2015 Page 9

**Table 4** 

**- 4** 

**. Pollutants of Concern**  **for Combustion Residual Leachate**

**Pollutant Group Pollutant**  Conventional Total Suspended Solids Nonconventional Aluminum Barium Boron Calcium Chloride Cobalt Iron Magnesium Manganese Moly bdenum Sodium Sulfate Total Dissolved Solids Vanadium Priority Antimony Arsenic Cadmium Chromium Copper Mercury Nickel Selenium Thallium Zinc



### 4.2 **Gasification Wastewater**

### Memorandum

September 30, 2015 Page 10

**Table 4** 

**- 5** 

**. Pollutants of Concern Analysis for Gasification Wastewater**  presents the results of EPA’s POC analysis and

### Memorandum

September 30, 2015 Page 11

**Table 4** 

**- 6** 

**. Pollutants of Concern for Gasification Wastewater** 
lists the 34 POCs EPA identified for gasification wastewater

.

### Memorandum

September 30, 2015 Page 12

**Table 4** 

**- 5** 

**. Pollutants of Concern Analysis for Gasification Wastewater** 

**Pollutant Group Pollutant**  **Number of**  **Samples Number** 

**of ND Samples**  **Number of** 

**Samples ≥**  **10xQL Percent**  **age**

**of Sam ples**  **≥ 10xQL**  **POC**

**( ≥**  **10% Samples**  **≥ 10xQL** **)** Conventional Biochemical Oxygen Demand 20 4 6 30 POC

Total Suspended Solids 20 12 2 10 POC Nonconventional Aluminum 20 4 14 70 POC

Ammonia as Nitrogen 20 0 9 45 POC Barium 20 6 7 35 POC Boron 20 0 9 45 POC Calcium 20 3 4 20 POC Chemical Oxygen Demand 20 2 11 55 POC Chloride 20 0 8 40 POC Cobalt 20 18 2 10 POC Iron 20 0 11 55 POC Magnesium 20 4 7 35 POC Manganese 20 0 11 55 POC Moly bdenum 20 7 5 25 POC Nitrate/ Nitrite as N itrogen 20 13 4 20 POC Nitrogen, Kjeldahl 20 0 14 70 POC Total Phosphorus 40 0 4 10 POC Sodium 20 0 8 40 POC Sulfate 20 4 3 15 POC Tin 20 18 0 0 Titanium 20 12 6 30 POC Total Dissolved Solids 20 0 17 85 POC Vanadium 20 1 18 90 POC Priority Antimony 20 16 2 10 POC

Arsenic 20 7 6 30 POC Beryllium 20 16 2 10 POC Cadmium 20 18 2 10 POC Chromium 20 14 0 0 Copper 20 13 3 15 POC Total Cyanide 20 5 11 55 POC Lead 20 12 4 20 POC Mercury 20 4 7 35 POC Nickel 20 0 2 10 POC Selenium 20 0 14 70 POC Silver 20 20 0 0 Thallium 20 8 9 45 POC Zinc 20 3 3 15 POC

### Memorandum

September 30, 2015 Page 13

**Table 4** 

**- 6** 

**. Pollutants of Concern for Gasification Wastewater** 

**Pollutant Group Pollutant**  Conventional Biochemical Oxygen Demand Total Suspended Solids Nonconventional Aluminum Ammonia as Nitrogen Barium Boron Calcium Chemical Oxygen Demand Chloride Cobalt Iron Magnesium Manganese Moly bdenum Nitrate Nitrite as N Nitrogen, Kjeldahl Total Phosphorus Sodium Sulfate Titanium Total Dissolved Solids Vanadium Priority Antimony Arsenic Beryllium Cadmium Copper Total Cyanide Lead Mercury Nickel Selenium Thallium Zinc 

### presents the number of samples anal yz ed for each pollutant in FGD wastewater, the number of sample results that were not detected above the sample QL , and the number and percentage of sampl e results that were detected at a concentration greater than or equal to ten times the sample

specific QL

. EPA identified 3 1 POCs for FGD wastewater (listed in **Error! Reference source not found.**  )

.
**Table 4** 

**- 1**  **. Pollutants of Concern Analysis for FGD Wastewater**

**Pollutant Group Pollutant**  **Number of**  **Samples Number** 

**of ND Samples**  **Number of** 

**Samples ≥**  **10xQL Percent**  **age**

**of Sam ples**  **≥ 10xQL**  **POC**

**( ≥**  **10% Samples**  **≥ 10xQL** **)** Conventional Biochemical Oxygen Demand 59 33 0 0

Total Suspended Solids 59 0 59 100 POC

### Memorandum

September 30, 2015 Page 14

**Table 4** 

**- 1**  **. Pollutants of Concern Analysis for FGD Wastewater**

**Pollutant Group Pollutant**  **Number of**  **Samples Number** 

**of ND Samples**  **Number of** 

**Samples ≥**  **10xQL Percent**  **age**

**of Sam ples**  **≥ 10xQL**  **POC**

**( ≥**  **10% Samples**  **≥ 10xQL** **)** Nonconventional Aluminum 59 0 59 100 POC

Ammonia as Nitrogen 72 11 9 12.5 POC Barium 59 0 58 98.3 POC Boron 59 0 47 79.7 POC Calcium 59 0 59 100 POC Chemical Oxygen Demand 59 1 0 0 Chloride 59 0 22 37.3 POC Cobalt 59 0 16 27.1 POC Hexavalent Chromium 27 27 0 0 Iron 59 0 59 100 POC Magnesium 59 0 59 100 POC Manganese 59 0 59 100 POC Moly bdenum 59 7 8 13.6 POC Nitrate/Nitrite as Nitrogen 75 1 74 98.7 POC Nitrogen, Kjeldahl 59 2 0 0 Sodium 59 0 33 55.9 POC Sulfate 59 0 0 0 Tin 59 59 0 0 Titanium 59 0 58 98.3 POC Total Dissolved Solids 59 0 58 98.3 POC Total Phosphorus 59 17 15 25.4 POC Vanadium 59 0 52 88.1 POC Priority Antimony 59 7 25 42.4 POC

Arsenic 221 8 119 53.8 POC Beryllium 59 4 10 16.9 POC Cadmium 59 6 20 33.9 POC Chromium 59 0 55 93.2 POC Copper 59 0 55 93.2 POC Lead 59 0 54 91.5 POC Mercury 456 9 271 59.4 POC Nickel 59 0 59 100 POC Selenium 98 0 97 99.0 POC Silver 59 47 1 1. 69 Thallium 59 9 9 15.3 POC Total Cyanide 59 14 11 18.6 POC Zinc 59 0 50 84.7 POC

### Memorandum

September 30, 2015 Page 15

**Table 4** 

**- 2**  **. Pollutants of Concern for FGD Wastewater**

**Pollutant Group**  **Pollutant** Conventional Total Suspended Solids Nonconventional Aluminum Ammonia as Nitrogen Barium Boron Calcium Chloride Cobalt Iron Magnesium Manganese Moly bdenum Nitrate/Nitrite as Nitrogen Sodium Titanium Total Dissolved Solids Total Phosphorus Vanadium Priority Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Mercury Nickel Selenium Thallium Total Cyanide Zinc



### 4.3 **Combustion Residual Leachate**

### Memorandum

September 30, 2015 Page 16

Table 4

- 3

. Pollutants of Concern Anal ys is for Combustion Residual Leachate

presents the results of EPA’s POC analysis and

### Memorandum

September 30, 2015 Page 17

Table 4

- 4

. Pollutants of Concern for Combustion Residual Leachate

lists the 25 POCs EPA identified for combustion residual leachate.

### Memorandum

September 30, 2015 Page 18

**Table 4** 

**- 3** 

**. Pollutants of Concern Analysis for Combustion Residual Leachate** 

**Pollutant Group Pollutant**  **Number of**  **Samples Number** 

**of ND Samples**  **Number of** 

**Samples ≥**  **10xQL Percent**  **age**

**of Sam ples**  **≥ 10xQL**  **POC**

**( ≥**  **10% Samples**  **≥ 10xQL** **)** Conventional Total Suspended Solids 242 75 37 15.3 POC Nonconventional Aluminum 242 48 90 37.2 POC

Barium 242 2 156 64.5 POC Boron 242 4 207 85.5 POC Calcium 242 1 234 96.7 POC Chloride 242 2 182 75.2 POC Cobalt 242 61 76 31.4 POC Iron 242 35 104 43.0 POC Magnesium 242 5 216 89.3 POC Manganese 242 16 182 75.2 POC Moly bdenum 242 16 188 77.7 POC Sodium 242 0 216 89.3 POC Sulfate 242 1 203 83.9 POC Tin 242 173 5 2.07 Titanium 242 118 11 4.55 Total Dissolved Solids 242 1 241 99.6 POC Vanadium 242 100 49 20.2 POC Priority Antimony 242 76 27 11.2 POC

Arsenic 242 28 130 53.7 POC Beryllium 242 166 11 4.55 Cadmium 242 61 63 26.0 POC Chromium 241 112 27 11.2 POC Copper 242 82 29 12.0 POC Lead 242 126 21 8.68 Mercury 238 37 85 35.7 POC Nickel 242 52 80 33.1 POC Selenium 242 24 79 32.6 POC Silver 242 183 1 0.413 Thallium 242 93 26 10.7 POC Zinc 242 69 68 28.1 POC

### Memorandum

September 30, 2015 Page 19

**Table 4** 

**- 4** 

**. Pollutants of Concern**  **for Combustion Residual Leachate**

**Pollutant Group Pollutant**  Conventional Total Suspended Solids Nonconventional Aluminum Barium Boron Calcium Chloride Cobalt Iron Magnesium Manganese Moly bdenum Sodium Sulfate Total Dissolved Solids Vanadium Priority Antimony Arsenic Cadmium Chromium Copper Mercury Nickel Selenium Thallium Zinc



### 4.4 **Gasification Wastewater**

### Memorandum

September 30, 2015 Page 20

**Table 4** 

**- 5** 

**. Pollutants of Concern Analysis for Gasification Wastewater**  presents the results of EPA’s POC analysis and

### Memorandum

September 30, 2015 Page 21

**Table 4** 

**- 6** 

**. Pollutants of Concern for Gasification Wastewater** 
lists the 34 POCs EPA identified for gasification wastewater

.

### Memorandum

September 30, 2015 Page 22

**Table 4** 

**- 5** 

**. Pollutants of Concern Analysis for Gasification Wastewater** 

**Pollutant Group Pollutant**  **Number of**  **Samples Number** 

**of ND Samples**  **Number of** 

**Samples ≥**  **10xQL Percent**  **age**

**of Sam ples**  **≥ 10xQL**  **POC**

**( ≥**  **10% Samples**  **≥ 10xQL** **)** Conventional Biochemical Oxygen Demand 20 4 6 30 POC

Total Suspended Solids 20 12 2 10 POC Nonconventional Aluminum 20 4 14 70 POC

Ammonia as Nitrogen 20 0 9 45 POC Barium 20 6 7 35 POC Boron 20 0 9 45 POC Calcium 20 3 4 20 POC Chemical Oxygen Demand 20 2 11 55 POC Chloride 20 0 8 40 POC Cobalt 20 18 2 10 POC Iron 20 0 11 55 POC Magnesium 20 4 7 35 POC Manganese 20 0 11 55 POC Moly bdenum 20 7 5 25 POC Nitrate/ Nitrite as N itrogen 20 13 4 20 POC Nitrogen, Kjeldahl 20 0 14 70 POC Total Phosphorus 40 0 4 10 POC Sodium 20 0 8 40 POC Sulfate 20 4 3 15 POC Tin 20 18 0 0 Titanium 20 12 6 30 POC Total Dissolved Solids 20 0 17 85 POC Vanadium 20 1 18 90 POC Priority Antimony 20 16 2 10 POC

Arsenic 20 7 6 30 POC Beryllium 20 16 2 10 POC Cadmium 20 18 2 10 POC Chromium 20 14 0 0 Copper 20 13 3 15 POC Total Cyanide 20 5 11 55 POC Lead 20 12 4 20 POC Mercury 20 4 7 35 POC Nickel 20 0 2 10 POC Selenium 20 0 14 70 POC Silver 20 20 0 0 Thallium 20 8 9 45 POC Zinc 20 3 3 15 POC

### Memorandum

September 30, 2015 Page 23

**Table 4** 

**- 6** 

**. Pollutants of Concern for Gasification Wastewater** 

**Pollutant Group Pollutant**  Conventional Biochemical Oxygen Demand Total Suspended Solids Nonconventional Aluminum Ammonia as Nitrogen Barium Boron Calcium Chemical Oxygen Demand Chloride Cobalt Iron Magnesium Manganese Moly bdenum Nitrate Nitrite as N Nitrogen, Kjeldahl Total Phosphorus Sodium Sulfate Titanium Total Dissolved Solids Vanadium Priority Antimony Arsenic Beryllium Cadmium Copper Total Cyanide Lead Mercury Nickel Selenium Thallium Zinc