Disposal of Liquid Waste

Deep-Well Injection Deep-well injection for the disposal of liquid wastes involves injecting the wastes deep in the ground into permeable rock formation (typically limestone or dolomite) or underground caverns. 

Large amounts of water are used in the copper concentration process, although disposal of liquid wastes is rarely a problem because the vast majority of the water is recycled back into the process. Once the wastewater exits the flotation process it is sent to a sediment control pond where it is held long enough for most of the sediment to settle. 

This chapter deals with the characterization, environmental regulations, and treatment and disposal of liquid wastes generated from the pesticide industry. 

The restrictions on the land disposal of many wastes have increased the cost of hazardous waste disposal. The land disposal restrictions that affect metal fabricators have been in effect for several years. For example, the restrictions on the land disposal of liquid wastes containing toxic metals and/or acids began on January 1,1984 (Section 66905 CCR). These restrictions have caused increases in disposal costs since these wastes now require some form of treatment prior to land disposal. These increased waste disposal costs are viewed as a driving force for the metal finishing industry to implement waste reduction technologies. 

FIGURE 5.12 Details of an injection installation for deep-well disposal of liquid wastes. 

Waste Disposal In laboratories two types of wastes (i.e. liquid and solid) are often encountered. Arrangements have to be made for disposal of these wastes. For disposal of liquid wastes use of lead pipes or earthen ware pipes is considered most suitable. However care be taken to avoid the flow of solids like pieces of filter paper, cork, broken glass pieces etc. through these pipes, otherwise these pipes get chocked. For disposal of such solid wastes metal boxes or wooden boxes be provided. Such boxes be placed in the comers of the laboratory and students be asked to put all solid wastes in these boxes. Such waste boxes can even be placed under the sinks as shown in Fig. 

NRC. 2001. Evaluation of Alternative Technologies for Disposal of Liquid Wastes from the Explosive Destruction System. Washington, D.C. National Academy Press. 

The disposal of liquid wastes containing chlorinated compounds, which are recognized as extremely toxic to aquatic life and resistant to biodegradation, is a problem of great urgency [1]. In order to prevent pollution by these materials, usually they are incinerated. Incineration is effective, but it is expensive and does not recover any value from the waste materials. 

ALTERNATIVE TECHNOLOGIES FOR DISPOSAL OF LIQUID WASTES FROM THE EXPLOSIVE DESTRUCTION SYSTEM... 

Polyreactions in bulk are carried out without solvents or diluents. In this way, high molecular weights can be obtained frequently with high rates of reaction. The resulting products are very pure, because only monomers and, if necessary, initiators and catalysts are added. Polyreactions in bulk are also advantageous for economical and ecological reasons because recycling and purification of solvents or dispersants as well as the disposal of liquid waste (as in the case of aqueous suspension or emulsion polymerizations) are not necessary. On the other hand. 

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