Natural plant based solution for industrial wastewater

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Research Paper 01/06/2017
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Natural plant based solution for industrial wastewater

Amina Kanwal, Safdar Ali, Muhammad Farhan
J. Bio. Env. Sci.10( 6), 83-91, June 2017.
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In developing countries like Pakistan, industries are increasing rapidly and are reluctant to manage industrial wastes and wastewaters. This industrial wastewater (IWW) containing number of toxic chemicals, which join natural water streams to disturb the whole ecosystem. Among physical and chemical methods to treat IWW, nature based systems are gaining popularity being more eco-friendly, less laboriously and economical. One way is to irrigate forests with IWW where toxic chemicals/metals can be taken up by plants and is stored for longer time. We conducted seed germination studies on 5 tree species of family fabaceae. Healthy seeds of each species were surface sterilized and placed as 10 per Petri plate on 1 g cotton bed moistened with 15 ml of IWW diluted to 4 concentrations along with control, the Petri plates were placed in growth room for 15 days. Only 4 species responded well in the following sequence; Dalbergia sissoo L. > Albizia lebbeck (L.) Benth > Bauhinia purpurea L. > Pongamia pinnata (L.) Pierre. Seed germination percentage, germination time, seedling length and seedling fresh weight showed positive correlation with concentration of IWW. Heavy metal concentrations found in IWW were 0.006(Cu), 0.0097(Mn), 0.0014(Cr) and 0.0017(Pb) mgL-1. At higher concentration of IWW the germination response was reduced to nil, may be due to the increased toxicity level. Dalbergia sissoo showed 65% germination in 100% IWW. The maximum mean time to germination (115 hrs) was observed in Millettia peguensis and the maximum tolerance index (122) was exhibited by Dalbergia sissoo.   Based on germination index, mean time to germination, tolerance index and vigor index these species can be potential candidates to be used in forestry with diluted IWW irrigation. This study highlighted the use of IWW for forest irrigation benefits like, IWW management, IWW treatment, irrigation water scarcity and low forest cover.


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