ML19253B972
| ML19253B972 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/30/1976 |
| From: | GILBERT/COMMONWEALTH, INC. (FORMERLY GILBERT ASSOCIAT |
| To: | |
| Shared Package | |
| ML19253B970 | List: |
| References | |
| NUDOCS 7911010761 | |
| Download: ML19253B972 (13) | |
Text
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D.
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i WASTE
SUMMARY
FOR ENVIRONMENTAL PROTECTION AGENCY PROPOSED TREATMENT AND IMPLEMENTATION SCHEDULE FOR JULY 1, 1977 NFTES PERMIT NO. PA 0009920 METROPOLITAN EDISON COMPA!N THREE MILE ISLAND UNITS 1 AND 2 9
Issue Date January 30, 1976 Prepared by:
Gilbert Associates, Inc.
525 Lancaster Avenue
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Reading, Pennsylvania 1504 260 swsicemw
-< vn s1o 76 7 -
m e
TABLE OF CONTENTS
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Section fitle M
1
1.0 INTRODUCTION
2.0 DISCHARGE CATEGORY 001 - COMBINED MECHANICAL DRAFT 2
C00L7NG TOWER BLOWDOWN 2
2.1 PRESENT TREAnu:,sT 3.0 DISCHARGE CATEGORY 101 - TREATED SEWAGE EFFi.UENT 3
3 3.1 PROPOSED. TREATMENT 3.2 IMPLEMENTATION SCHEDULE 3
4.0 DISCHARGE CATEGORY 103 - PRE-OPERATIONAL CLEANING AND 4
FLUSHING SETTLING BASIN 4
4.1 PRESENT TREAIMENT 5.0 DISCHARGE CATECORY 104A - INDUSTRIAL WASTE FILTER 5
EFFLUENT 5
5.1 PROPOSD TREATMENT 5
5.2 IMPLEMENTATION SCHEDULE t{
6.0 DISCHARGE CATEGORY 104B - UNIT 1 WASTE NEUTRALIZATION 6
TANK EFFLUENT 6
6.1 PRESENT TREAIENT 7.0 DISCHARGE CATEGORY A* - 104C (UNIT 1 TURBINE PLANT SUMP),
102 (UNITS 1 AND 2 AU"ILIARY BOILER BLOWDOWN), AND UNIT 7
2 SUMPS 7
7.1 PROPOSED TREATMENT 7.2
SUMMARY
DESCRIPTION OF TREATMENT 7
7.2.1 Waste Collection Hold Tank 7
7.2.2 Waste Treatment Facility Feed Pumps 8
7.2.3 Waste Treatment Primary Unit 8
7.2.4 Waste Treatment Secondarv Unit 8
9 7.2.5 Treated Waste Effluent 9
7.3 IMPLEMENTATION SCHEDULE 8.0 DISCHARGE CATEGORY B* - JNIT 2 - WASTE NEUTRALIZATION 10 TANK EFFLUENT 10 8.1 PROPOSED TREATMENT 8.2 IMPLEMENTATION SCHEDULE 10 ATTACIDiENT - Drawing D-300-148, Revision 1 1504 261 (WhertICannonween.h
1 l
1.0 INTRODL'CTION This document is written to describe briefly existing and proposed treatments for non-radioactive waste streams which are presently produced by Unit 1 and will be produced by Unit 2 at the Three Mile Island Nuclear Generating Station.
The nuclear station is located on Three Mile Island in the Susquehanna River, two miles south of Middletown, Pennsylvania, in Dauphin County.
The station consists of two electric generating units. Unit I has been commercial since September of 1974 and has a nominal generating capacity of 792 KWe. Unit 2 is presently under construction and is designed for a nominal generating capacity of 880 MWe.
The proposed treatments listed herein for each discharge category I (
are designed to meet the July 1,1977 EPA Standards as designated in NPDES permit No. PA 0009920 presently held by the Metropolitan Edison Company, operator of the generating facility. For clarity, this su= mary should be studied in conjunction with CAI Drawing Number D-300-148 Revision 1 which illustrates the various waste flow paths and associated treatments.
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Gibert /Carpmccmeau
2
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2.0 DISCHARGE CATEGORY 001 - COMBINED MECRWICAL DRAFT COOLING TOWER BLOWDOWN 2.1 PRESENT TREATMENT Data collected over an approximate 10 month period in 1975 show that all limitations imposed by the per=it are consistently being met.(l)
It is anticipated that the additional flow from Unit 2 will cause no significant changes in the station's ability to continue to meet these limitations.
The thermal limitations for Unit 1 are met by combining warmer natural draf t cooling tower blowdown with cooler once through plant service cooling water. The water, once mixed, is passed through a mechanical draf t cooling tower prior to discharge. This method of treatment will also be utilized for Unit 2.
t Temperature and flow are continuously monitored. Chlorine and pH are determined by grab samples.
Based on the above facts, it is felt that treatment will not be required now or in the future. However the stated parameters as listed in the permit will be monitored.
(1)It should be noted that temperature noncompliances were experienced during times when ambient river temperatures were equal to or greater than 87 F.
This situation was a result of 0
having conflicting Nuclear Regulatory Commission (NRC) and EPA regulations, and not due to inadequate temperature control capabilities.
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1504 263 GaertICommom.es4n
3 DISCHARGE C\\TEGORY 101 - TREATED SEWAGE EFFLUENT
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3.0 3.1 FR0 POSED TREATMENT The proposed form of treatment will be extended aeration and the site.
activated sludge for all sanitary wastes generated at This process will consist of comminuting the olids in the stream, pumping the sewage to an aeration tank to breakdown the organic solids, then passing the liquor to a primary clarifier to settle solids (sludge) and remove surface scum. Lime will be added to the overflow from the primary clarifier to remove phosporous in a secondary clarifier. The effluent from the secondary clarifier will be treated with acid to reduce the pH to acceptable limits.
Further treatment with hypochlorite for sterilization purposes will be conducte' in a contact chamber prior to discharge. All I (
sludges produced will be concentrated in a digester and transported off the site.
The system is designed to serve approximately 400 people and meet discharge limitations in the permit. All grab and composite sampling will be conducted on the effluent from the facility prior to its combination with other streams.
3.2 IMFLEMENTATION SCHEDULE The implementation schedule for the sewage treatment plant is:
Completion of Construction - December 1975 February 1976 Commence Operation
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1504 26l4 Gam:cmo
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4 4.0 DISCHARCE CATEGORY 103 - PRE-OPERAT!ONAL CLEANING AND FLUSHING SETTLING BASIN 4.1 PRESENT i M TMENT The past method of treatment, which was used to treat the pre-operational cleaning and flushing wastes produced by Unit 1, will again be employed when Unit 2 is chemically cleaned. The treatment consists of long term settling of the pre-operational cleaning and flushing wastes to drop out the suspended solids in two lined basins each having a one million gallon capacity. The sup ernatant from the basins is adjusted with acid as needed to meet the pH limitation prior to discharge. Grab sampling is performed during discharge. Past monitoring data indicate that this method of treatment is adequate to ensure the limitations for this discharge
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can be met.
It should be noted that the pre-operational and flushing operation is only performed one time for each unit. The wastes from the pre-operational cleaning of Unit I have already been treated and discharged as described above. The generation and discharge of these wastes will again occur prior to start up of Unit 2.
1504 265
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Gelbert /C&eiamwealta
e 1
5.0 DISCHARGE CATECORY 104A - ITDUSTRIAL WASTE FILTER EFFLUENT
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5.1 PROPOSED TREAIMENT Past laboratory data indicate that the vaste sources which are presently combined to makeup this point source contain only suspended solids in excess of that allowable by the permit.
The proposed method of treatment.will be removing solids by pressure filtration using a diatomaceous earth body feed. The effluent from the suspended solids removal facility will be flow monitored and composite sampled. The dewatered sludges will be tra% ported off the premises.
5.2 IMPLEMENTATION SCHEDULE Construction in Progress
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Complete Construction - March 1977
.C July 1977
'omence Operation 1504 266
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6 i
6.0 DISCHARGE CATECORY 104B - UNIT 1 WASTE NEUTRALIZATION TANK EFFLUE';T
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6.1
" RESENT TREATMENT The wastes produced in this category by Unit I are collected in a large holding tank and treated on a batch basis. The tank is equipped with agitation as well as pu=p circulation for proper mixing of either the acid or the base with the wastes to obtain the required pH.
Past monitcring data has shown that the wastes which are treated in the neutralization tank originate from sources which contribute very negligible amounts of suspended solids or oil and grease. The only parameter requiring treatment is pH.
Since this waste is treated in the tank on a batch basis and the tank geometry is known, the total volume of wastes and the time required to empty the tank is used for flow measurement. A well mixed grab sample of the tank contents taken during discharge is representative of the effluent prior to its combination with other streams.
Since the same type of wastes will be produced by Unit 2, the treatment operation will be essentially identical to that for Unit 1.
The Unit 2 waste neutralization tank effluent flow measurement and sampling method will remain the same as for Unit 1.
1504 267 s
Olbert/CarmomreaFJi
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l I
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i DISCHARCE CATEGORY A* - 10!.C (UNIT 1 TURBINE PLANT SUMP),
l 7.0 f
102 (UNITS t AND 2 AUXILIARY BOII.ER BLOWDOWN), AND UNIT 2 SUMPS 7.1 PROPOSED TREAT.ENT The waste water streams which originate from many sources within each These sumps are strategically unit are piped to various sumps.
it
-*ed for the purpose of collecting and removing the wastes to
.ent localized flooding of equipment.
pr Various in--plant services may contribute oil & grease, suspended solics, iron, and basicity to these waste streams.
Since these pollutants vary in size, type, and quantity and the flows from each source vary, it is proposed that the wastes from Unit 1 (turbine plant sump and auxiliary boiler blowdown) and the sump p
discharges from Unit 2 (as outlined on the Drawing) be collected in one vaste collection hold tank. These wastes will be processed through a proposed treatment facility properly designed to remove As a matter of pollutants to acceptable limits prior to discharge.
interest, please be advised that iron does exist in the Unit I tuGiae building sump and is anticipated to exist in the Unit 2 i
Further, in that iron is not limited in 104 type streams, sumps.
analysis will need to be conducted in order to determine the combined 102 and 104 waste stream treatment facility iron poundage limitation.
7.2
SUMMARY
DESCRIPTION OF TREATMENT 7.2.1 Waste Collee* ion Hold Tank
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A 258,000 gallon tank will be employed to collect wastes in one common vessel. The tank will be equipped with an agitator to assure adequate mixing.
I Gil.M.HT Anm.I tTF.5. I.K.
It14 268
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,7.2.2 Waste Treatment Facility Feed Pumps The untreated wastes will be transported at 100 gallons per minute I
from the vaste collection hold tank to the treatment facility using two motor driven feed pumps. Each pump will be capable of handling the design flow.
7.2.3 Waste Treatment Primary Unit A reactor type clarifier or similar device will be utilized as the first step for treating the wastes. In this unit pH will be adjusted to the acceptable limits. In addition, coagulants and coagulant aids will be added to remove the suspended solids, and iron. The settled sludge produced by this step will be pumped to The the f acility which is described in Discharge Category 104A.
free floating oils will be surf ace skimmed and removed tv
..;.: a i {
oil storage tank.
7.2.4 Waste Treatment Secondarv Unit The effluent from the primary unit will be pumped through a secondary unit where remaining oil and suspended solids will be removed to such a degree that permit limitations will be met.
The polishing flotation with air, phase may be carried out by one of three ways:
absorption on filter media, or mechanical filtration with cartridges.
Best available technology in conjunction with associated costs will dictate which of the secondary methods are selected. The free and emulsified oils separated from the waste stream in this operation will be removed to the waste oil storage tank as mentioned in 7.2.3.
At periodic intervals the oil collected in the tank will be
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transported of f the premises.
1504 269 cII.HLMT b50CI ATE 5. INC.
9 k
7.2.5 Treated Waste Effluent A recycle stream, controlled by continuous on-line oil and grease and pH analyzers, will be employed to insure that when the ef fluent does not meet the permit limitations no discharging will occur.
In addition, the treated waste effluent will be monitored for all parameters in accordance with permit criteria prior to discharge.
7.3 IMPLEMENTATION SCHEDULE The implementation schedule for the proposed facility is as follows:
Commence Construction - March 1, 1976 Complete Construction - March 1, 1977 July 1, 1977 Commence Operati n
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1504 270
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Geers /Cmm -
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8.0 DISCH/JGE CATEGORY B* - UNIT 2 - k'ASTE NEUTRALIZATION TA. r; T
EFFLUENT 8.1 PROPOSED TREAIMENT The proposed treatment for these wastes is as discussed in Discharge Category 104B. Please see Section 6.1 for explicit details.
8.2 IMPLEMENTATION SCHEDULE This method of treatment will be followed when Unit 2 becomes operational.
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1504 271
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