Sewer disposal

Sewer Disposal. Photoprocessing and printing wastes tend to be aqueous solutions that ate combined with other plant effluents and sent to the local sewer plant for treatment. The parameters of concern include silver, pH, and biological oxygen demand (BOD). BOD is a measure of how well a waste material degrades in the environment. Lower values ate preferred. Silver-bearing waste streams ate typically treated on-site, and the treated effluent is released to the drain. The printer usually receives a small cash credit for silver recovered. 

APPENDIX 17-6 CHEMICALS SUITABLE FOR SANITARY SEWER DISPOSAL 427... 

After the patient treated with has been released from hospital, the in the body is excreted primarily in the urine, and ends up in the sewage system and further into the environment. In general the activities are very low, and the dilution and the time it takes from deposition in the soil and return to the food chain make the environmental risk very low. Environmental impact from I has not been measurable. With appropriate regulations, even without storage of urine, sewer disposal of excreta from patients diagnosed or treated with I has been within radiation dose Emits (ICRP-94, 2004) and poses fittle hazard to the public and sewage workers. 

Chemicals that may be permissible for sewer disposal include aqueous solutions that readily biodegrade and low-toxicity solutions of inorganic substances. Water-miscible flammable liquids are frequently prohibited from disposal in the sewer system. Water-immiscible chemicals should never go down the drain. 

Use of nonignitable scintillation fluid (e.g., phenylxylylethane, linear alkylbenzenes, and diisopropylnaphthalene) instead of flammable scintillation fluid (e.g., toluene, xylene, and pseudocumene). Liquid scintillation fluid that is sold as being "biodegradable" or "sewer disposable" is more appropriately labeled as "nonignitable" because biodegradability in the sanitary sewer can vary considerably with the local treatment facility. 

Some institutions grind radioactive animal tissue for disposal in the sanitary sewer, although the U.S. NRC requires that all sewer-disposable waste be dispersible. Preventing contamination and exposure of waste handlers to dust or particles is an iir tortant safety measure in this operation. 

Monitor sewer disposal of laboratory waste by individual workers or students for adherence to guidelines on types of chemicals, quantities and rates, and flushing procedures. 

In any refining scheme, the wastewater from the distillation tower is fed to a waste stripper where trace organics are removed prior to the sewer disposal. The organics are recycled to the process. In addition, the process and product storage vents are collected in a recovery system where amines and ammonia are recovered for recycle. Noncondensables are vented. 

Features Uncured no heating required economical sewer disposable quick separation... 

Uses Emulsifier to clean uncured resins and gel coats Features Economical sewer disposable... 

Features Replaces caustic compds. and hazardous soivs. economical non-flammable sewer disposable... 

Uses Emulsifier to clean uncured polyester resins and gel coats Features Cost effective very low VOCs non-flammable sewer disposable Properties Pink liq. mild odor misc. in water sp.gr. 1.0 b.p. 212 F flash pt. 220F ... 

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