The spent unusable water in the industry is the industrial waste water.

Composition of industrial waste water depends on the usage processes of the particular industry. But it is fully enriched with organic and inorganic components.

It all depends on the type of industry,for instance petrochemical waste water is full of phenol.waste water of textile industry is full of organic dyes.

...and water from electroplating contains heavy metals and cynides and...

There is no single answer to this question. There is not a single answer even for a given industry as it depends on all the processes where wasewaters result. Therefore, pre-treatment is usually compulsory (by law) in the factory, before discharging the wastewaters to the municipal plant.

There is no any specific and standard composition analysis regarding the industrial waste water. First and most important one you must know the processing of the industry and then to find out about the characterization of the waste water. However several wastewaters presented with similar characteristics even though the processing is completely deferent

The industrial waste water contains the chemical composition of the materials used in the manufacturing / processing. The composition may be fragmentation of the input materials used in the industry.

Composition of Industrial wastewater depends on the Industrial processes involve. But generally in can be classify into two components; Organic and Inorganic components.

Because every industrial wastewater is unique, you have to look at various sources of this information at web and libraries.

Regards

Vit