Waste tank

Petrochemical Plant. Hazardous Waste Tank Failure. 4.5-1... 

Clear-waste tank. An unlined steel clear-waste tank is typically used to hold clarified waste before injection. The tank is equipped with a float switch designed to start and stop the injection pump at predetermined levels. 

Line up valves on the HLO and LLO streams from the POD to the coolers and to their respective waste tanks. 

Gas chromatographic analysis of samples taken from the waste tank showed a steady decline in all three pesticides from the water. The results of the GC analysis of the water as a function of time are shown in Table V and graphed in Figure 9. The efficiency factors were calculated and are presented in Table VI. 

The VOC Treatment Module consists of two air stripping units and three portable carbon filter units. One air stripper is in use and the other is on standby or being cleaned. Hydrolysate from the Hydrolysate Tank is cooled to reduce temperature in the carbon beds before being fed to the air stripper. After air stripping the hydrolysate is stored in the Waste Tank for transfer to the Biotreatment Module. The VOC laden air stream from the air stripper is passed through three carbon beds to remove the VOC before the air stream is vented to the atmosphere. The carbon filters are recycled to the portable carbon filter unit vendor for regeneration. 

The stripped hydrolysate is transferred from the Waste Tank... 

The chemical components with the most effect on radioelement solubility and sorption were NaOH, NaA102, EDTA, and HEDTA. The EDTA and HEDTA increased Co, Sr, and Am solubility and decreased sorption for almost all radioelements studied. Sodium hydroxide and NaA102 increased Pu solubility and decreased Np and Pu sorption. Sodium nitrite decreased Np solubility, while Na2C03 and HEDTA increased it. These observations give evidence for the formation of radioelement complexes which are soluble and are not strongly sorbed by the sediments near the waste tanks. 

Shut-down. When the end-of-feed condition occurs for 1AAF, 2AAF or 3AAF, the feed-line to the "high active" feed pump is switched over to the "inactive" feed tank, which can contain simulated HLLW solution, but more normally only HN0 of the appropriate concentration. This solution is used until most of the equipment has been roughly decontaminated. Then all feed-pumps and mixer-settlers are shut off. The mixer-motor units and level transducers are removed from the batteries and the mixer-settlers emptied from solution using a hose and pump attached to a waste tank. 

Approximately 6 kg of Am-Cm were recovered from the stored Am-Cm-A1(N03)3 waste. The process yielded an overall recovery of 75%. Of the losses, 2.5% represented soluble losses and the remainder was entrained losses. Of this 20% lost to the waste supernate stream, about 14% (yl.l kg) is stored for future recovery the remaining 7% was actually lost to the waste tanks. The major contaminants of the purified Am-Cm product are Fe, Al, and Na. 

Leaching of contaminants Eission products Tc, partitioned from high-level waste tanks, debris from contaminated pipes from K-25 plant at Oak Ridge Cs, from salt supernatant and sludge, silico-titanates, and wastewater Radioactive components Ra, Fernald silo waste, transuranics, simulated and actual Rocky Flats ash waste, wastewater... 

Ceramicrete stabilization of Tc, partitioned from high-level tank wastes, was demonstrated by Singh et al. [11]. The waste stream was a product of a complexation-elution process that separates Tc from HLW, such as supernatant from salt waste tanks at Hanford and Savannah River. A typical waste solution generated during the complexation-elution process contains 1 M NaOH, 1 M ethylenediamine, and 0.005 M Sn +. 

Two assumptions are made concerning the present waste storage tanks (1) the waste tanks can be decontaminated sufficiently so that they can be decommissioned in place and (2) activity levels will be reduced to the point that the final stages of decontamination can be done manually. 

The decontaminated supemate may be evaporated to a solid salt in a wiped film evaporator. For the design basis assumed in this study, the total volume of solidified salt would be about 100 million 1. (/ 25 million gal). Since the heat-producing isotopes will be removed, this material can be stored in large containers in bulk storage. It is expected that the decontamination of this material will be sufficient that the principal hazard in the salt cake will be the nitrate itself. The activity left in the salt may well be less than that left in waste tanks after final decontamination. On this basis, further processing of this material into a less leachable form would probably not be necessary. However, it is presently assumed that this material cannot be dispersed to the environment. 

The 300,000-gal waste tanks and the associated concrete secondary containment vaults were analyzed for their dynamic response to a hypothetical earthquake occurring at the NRTS, using the STRAP-D (Struc-... 

Figure 1. Schematic diagram of typical 300,000-gal liquid waste tank at ICPP...

The tanks are also connected to reflux condensers, which will condense the vapors if the waste boils. These condensers are stainless steel shell-and-tube condensers contained in concrete housings in the tank farm area. The condenser pits have sumps equipped with jets to transfer leakage back to one of the waste tanks however, the condensers are not normally used. 

Figure 2 is a photograph of salt cake laid down in one of the underground tanks. The estimated inventory and characteristics of the salt cake to be stored in the waste tanks by about 1980 are listed in Table IV. The composition range shown for salt cake is for air-dried material. In reality salt cake will likely contain varying amounts of interstitial recycle liquor and should be more properly termed "damp or "wet salt cake. 

Table I is a typical daily operating report for the NFS Waste Tank Farm. It shows that temperatures, densities, liquid levels, air flow rates, etc. are observed and recorded at least three times a day. Any equipment malfunction or response to the continuously monitored alarms is reported at least once a day on a supervisor s summary report. With the required initialing of both the operator and the supervisor on each shift, at least six trained individuals are made aware of the operating status of the facilities daily. In addition, these daily reports are distributed to no less than four other responsible members of management for information and review.

With the marina dredging, the diesel generators to power at least 350 air conditioners, the outflow from potentially thousands of toilet flushes a day, up to 140 boats with their fuel and waste tanks, tons of garbage, and all the fresh water needed to keep people and landscaping... 

Cooling coils can be provided in waste tanks for heat removal. Potential coil failure with cooling water contamination, may be regarded as the disadvantage of this method. 

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