A cool place using mild steel, cast iron or galvanised iron enclosed containers or tanks is recommended for most solvents but individual requirements should be checked.
Small quantities of non-inflammable solvents can be kept in glass containers [usually as supplied]. All storage containers must be labelled with the contents. Most film laboratories used some form of in-house distillation for re-use of solvents used in large quantities, such as 1:1:1 TCE. The newer solvent cleaning machines incorporate their own integral re-distillation unit, but inevitably there will always remain some solvent to dispose of, and local distillation [often called Solvent Recovery] results in less to dispose, but what there is, contains all the cleaned off greases and oils and is frequently a very nasty mixture.
Flammable solvents require special transportation and fire protection during disposal and must be kept in special [usually] stainless steel containers with special "anti-flash" closures.
Disposal by the sewer may be permitted for water based film cleaners but only according to local regulations. In UK, for example, it is permitted only with written consent from the local water company and is regulated by an agreement between the organisation and the sewage company called the Consent to Discharge. This defines both the substances permitted and the maximum concentrations permitted.
Throughout most of the EU no solvent is permitted to be placed into the sewers, so waste solvents must be collected and disposed of through specialist organisations. The Control of Pollution (Special Waste) Regulations 1980 applies in the UK and carriers of controlled waste must register with their local Waste Regulation Authority. In all other EU countries there are equivalent regulations and authorities.