| Seawater substitute can effectively alleviate the shortage of freshwater resourcesin the coastal area, but the discharge and disposal of wastewater containing saltresulting become a new problem. Wetland is widely used in the treatment of domesticsewage, storm water runoff, industrial wastewater, printing and dyeing wastewater,landfill leachate and many other wastewater. However, studies with saline wastewatertreatment wetland fewer still lack adequate theoretical and practical data. In this study,two sets of laboratory-scaled wetland reactors (slag filler combination constructedwetland and zeolite filler horizontal subsurface flow wetland) was used of processinglaboratory simulation of saline wastewater, the main contents are:(1) the removaleffect of pollutants in municipal saline wastewater by slag packing subsurface flowconstructed wetland in horizontal flow wetlands half water and the full water leveloperation condition;(2) research the pollutant removal efficiency of slag packingsubsurface flow constructed wetland and zeolite filler horizontal subsurface flowconstructed wetland under the conditions of influent salinity of0.15%,0.3%and0.6%respectively;(3) analysis of pollutants along the flow direction changes along theprocess of concentration in slag packing subsurface flow constructed wetland, explorethe hydraulic characteristics.The main conclusions are as substrate:(1) Slag packing subsurface flow constructed wetland for horizontal flow wetarea changed from semi level for the full water level condition, combination ofwetland on NH4+-N and the total TN removal efficiency varies greatly, The removalrate of NH4+-N increased from64.8%to91%, the effluent decreased from4.9mg/L to1mg/L, the removal rate of TN increased from74.8%to95%, the effluentconcentration decreased from7.5mg/L to0.66mg/L; change the water level had littleeffect on the removal rate of removal of NO3--N and TP, the former has alwaysmaintained a high level of removal, the removal of latter upgrade from86.12%to 88.96%, effluent TP concentration reduced from0.771mg/L to0.402mg/L;Variable water level makes the total COD removal efficiency decreased slightly from86.5%to82%lower effluent COD concentration increased from23.4mg/L to27.2mg/L; the DO and pH did not change significantly before and after the change inwater level in combination wetland system.(2) In the water salinity of0.15%,0.3%and0.6%condition, slag fillercombination constructed wetland and zeolite filling wetlands removal on COD,NH4+-N, N03--N, TN and TP showed different changes trend. The removal rate ofCOD in two kinds of packing with the water salinity increased slightly lower, at3different salinity conditions slag packing subsurface flow constructed wetland CODremoval rates were82.1%,81.5%and80%, the effluent COD concentration was27.2mg/L,32.7mg/L and40.9mg/L zeolite filler horizontal flow wetland, the removalrate of COD for77.7%,74.1%and68%, the effluent COD concentration was38.2mg/L,52.4mg/L and63.9mg/L. The removal rate of TN of two kinds of fillers onNH4+-N and increased with the increase of salinity are increased firstly and thendecrease, slag filler wetland NH4+-N removal rates were91.2%,99%and90%, theremoval rate of TN were97%,99.6%and93.9%; The removal rates of zeolite fillingwetlands of NH4+--N were42.4%,46.4%and21%, the removal rate of TN were66%,81.7%and61.4%. In three salinity conditions, slag and zeolite filler wetlands NO3--Nremoval rate tended to decrease in salinity between0.15%removal of99.9%and99%,the effluent concentrations of less than1mg/L, removal rate of NO3--N in zeolitefiller wetlands at0.3%and0.6%salinity was reduced to90or so, the water NO3--Nconcentration is always lower than1mg/L, the removal of NO3--N in slag wetlandsat0.3%salinity reduced greatly, maintaining more than60%, at0.6%salinity rises toover90%. In slag filler, the removal rate of TP were80%,99%and89.9%, theeffluent TP concentration was0.8mg/L,0.033mg/L and0.4mg/L, the removal rateof TP in zeolite filling wetlands at0.15%salinity conditions decreased from20%to-20%, the effluent TP concentration increased from3.1mg/L to4.6mg/L, at salinityof0.3%and0.6%under the conditions of the removal efficiency first increased andthen decreased, respectively41%and33.4%. (3) By sampling port sampling detected in the reactor along the way, researchslag filler combination constructed wetland pollutant concentration variation along theflow direction along the way, found that slag filler combination constructed wetlandfor COD, NH4+-N, NO3-N, TN and degradation of TP are suitable for first-orderkinetic model can be expressed by the following equation: NH4+-NC=17.8824e-0.01315x， R2=0.9252； NO3--N C=13.7344e-0.0066x， R2=0.7286； TNC=28.5499e-0.0087x， R2=0.88； COD C=140.8622e-0.0119x， R2=0.8241； TPC=3.7319e-0.0065x，R2=0.8438。... |
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