Environmental pollution resulting from the discharge of untreated industrial effluents has beenrnputting serious risks on the survivability and perpetuation of all living things including humanrnbeings for the past few years. From the various treatment methods natural means of treatingrnindustrial wastewater have been exercised in many parts of the world for they arernenvironmentally permissible and help to keep its natural values. Among those natural ways ofrntreating wastewater constructed wetlands have been utilized for the past few decades. In thisrnresearch three horizontal subsurface flow constructed wetlands (HSSFCWs) have been used forrnthe treatment of dairy wastewater discharged from Ada milk factory. The first HSSFCW was keptrnas control with only gravel and the rest two HSSFCWs were planted with widely used emergentrnplant species, Typha latifolia and Scirpus lacustris. The wetlands flow rate was adjusted to 25rnL/d and as hydraulic retention time (HRT) 8 days was used for three replicates of thernexperiments. After laboratory investigations were carried out it was found that the wetlandrnplanted with Scirpus lacustris showed better capacity in removing pollutants from the dairyrnwastewater than the wetland planted with Typha latifolia. The average removal efficiencies ofrnthe wetland planted with Scirpus lacustris and the unplanted wetland were found as follows,rnrespectively. BOD (84.2%, 65.2%), COD (84.4%, 68.2%), TN (43.4%, 22.8%), NH4+-N (84.2%,rn59.2%), NO3_N (97.5%,88.7%), TSS (65%,70%,),VSS(32%,43%), TP (53.8%,27%), OPrn(80.7%,75.2%), FOG (95.3%,93%), TCa (39%,21.8%) and TC (89.7%,69.3%). Besides theirrnimportance in wastewater treatment, these emergent plants have versatile uses among these theirrnmedicinal and dietary values were widely recorded. Thus, it is environmentally advisablernmechanism to utilize constructed wetlands for wastewater treatment. From laboratoryrninvestigations it was found that BOD, TN, NH4+-N, NO3--N, TP and PO43--P are the main factorsrnfor the pollution of the Dairy wastewater.rnKeywords: Constructed wetland, Scirpuslacustris, Typhalatifolia, dairy wastewater