Water recycling applications in the industry
Zero discharge of water
Zero discharge changed from a technical description of 100% wastewater recycling to a goal. recycling of all industrial wastewater is the essence of zero discharge. wastewater will be treated and used again in the process and wastewater will not be released on the sewer system or surface water.

water reuse for agricultural irrigation
treated wastewater is growing in demand in many parts of the world because of Water shortages, deterioration of water quality, and environmental constraints etc. municipal wastewater effluent is used for agricultural water reuse. This need is graver in the arid regions. wastewater contains plant nutrients and soil amendments. agricultural areas may be adjacent to treatment plants, and crops can level the charges .

Water disinfection and reuse in greenhouse horticulture.
Soil-less growing systems are becoming common in horticultural practice in most of the European countries.
-Increased quality of products
-Better control of growth by use of improved water quality and a better fertilization
etc are the advantages of this type of agriculture.

Water reuse in the paper and cellulose industry
Paper and cellulose industry is forced are forced to reduce their water consumption.. Normally the wastewater from a paper plant is biologically treated, but the quality of the effluent may be good enough for disposal but it is not high enough for reuse as process water. membrane filtration, Micro filtration (MF), Ultra filtration (UF) and Nano filtration (UF) etc are the different methods used for filtration.

for more details, refer this link:
http://lenntechwater_reuse_paper_industry.htm