Efficiency of Glutinous Rice Straw Extracts (RD-Six) and Water Hyacinth in Inhibiting Algal Growth and Reducing Nutrients from a Hyper-eutrophic Pond

Environment and Natural Resources Journal

Ratcha Chaichana¹  Patana Anurakpongsatorn¹  Wipawan Intasan¹ 

[1] Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok 10900, Thailand;

关键词: allelochemical;    eutrophication;    phenolic compound;    phytoplankton;    restoration;    thailand;    water quality;   

DOI  :  10.32526/ennrj/19/2020148

来源: DOAJ

【 摘 要 】

Eutrophicationisoneofthemainwaterpollutionproblems,whichoccurs throughout Thailand. This research focused on the use of glutinous rice straw (RD-Six)extractandwaterhyacinthtoreducenutrientsandtoinhibit phytoplanktongrowthinhypereutrophicwater.Inthisresearch,weused (1) controlwithoutglutinousricestrawextractandwaterhyacinth;and (2)experimentaltreatmentwithglutinousricestrawextractandwaterhyacinth.Experiments were set up for eight days in ten concrete circle pit blocks (0.80 min diameter and 0.40 m in height) in year 2020 (five replicates for each controland experimental treatment). Water quality was analyzed physically, chemicallyand biologically, and the effect of glutinous rice straw extracton phytoplanktonand the growth rate of water hyacinth were also determined. The result showedthat values of water quality parameters (turbidity, DO, BOD, SS, TKN, NH3-N,NO2,TP, SRP,TN,andChlorophylla)wereimproved.Thevaluesofwaterqualityweresignificantlylower(p<0.05)inexperimentaltreatmentsthanincontrols. Glutinous rice straw extract had no effect on water hyacinth growth.Thestudyofphytoplanktoncompositiondemonstratedthat,priortotheexperiment,Cyanophytawasthedominantgroupinbothcontrolandexperimentaltreatments.Aftertheexperiment,Cyanophytabecamelessabundant in experimental treatments. Reduction of Cyanophyta could be causedby the direct effect of allelochemicals (phenolic compounds) from glutinous ricestraw extract. Therefore, this combined method has displayed their effectivenessin reducing nutrients and inhibiting phytoplankton growth in eutrophic water.

【 授权许可】

Unknown