4种镧改性海藻粉末对养殖废水中磷的去除
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摘要
为了解决使用矿物材料除磷产生大量沉积物的问题和实现磷的资源化利用,研究了镧改性的海带(LaLJ)、石莼(La-UL)、红藻(La-RP)和浒苔(La-EP)干化粉末材料对模拟废水和养猪废水中磷的吸附特征。在模拟废水中,随吸附剂用量的增加,4种镧改性的海藻对模拟废水中磷的吸附量均呈指数下降;随初始pH的升高,La-EP和La-UL对磷的吸附量增加,而La-LJ和La-RP对磷的吸附量减少。动力学吸附过程和等温吸附过程分别用准二级动力学模型和Freundlich模型拟合更适合。4种镧改性海藻对磷的最大吸附量为8.94～11.25 mg·g~(-1),相比于改性前,La-LJ、La-UL、La-RP和La-EP对磷的吸附量分别增加了24、38、66和25倍。在养猪废水中,经4种镧改性海藻吸附处理后,废水含磷浓度降低到2.5 mg·L~(-1)以下,能实现达标排放。因此,镧改性的4种海藻是养猪废水吸附除磷的可行材料。
In order to solve the problem that a large amount of sediments occurrence when the mineral materials were used to remove phosphorus and to fulfill the phosphorus resource utilization, the adsorption characteristics of phosphorus in simulated wastewater and swine wastewater were studied with lanthanummodified Laminaria japonica(La-LJ), Ulva lactuca(La-UL), Rhodymenia palmata(La-RP) and Enteromorpha prolifera(La-EP). In simulated water, the adsorption capacities of four lanthanum-modified seaweeds decreased exponentially with the increase of dosage. With the increase of initial pH, the adsorption capacities of La-EP and La-UL increased, while the adsorption capacities of La-LJ and La-RP decreased. The kinetic processes and isothermal adsorption could be better fitted by the pseudo-second order kinetic model and Freundlich adsorption isotherm model, respectively. The maximum adsorption capacities of the four types of lanthanum-modified seaweeds were among 8.94～11.25 mg·g~(-1). Compared with pre-modification seaweeds, the adsorption capacities of La-LJ, La-UL, La-RP and La-EP increased by 24, 38, 66 and 25 times, respectively. Moreover, the phosphorus concentrations in the swine wastewater after adsorption were reduced to 2.5 mg·L~(-1), which could meet the corresponding discharge standard in China. Therefore, four types of lanthanum-modified seaweeds could be feasible to remove phosphorus from swine wastewater.
In order to solve the problem that a large amount of sediments occurrence when the mineral materials were used to remove phosphorus and to fulfill the phosphorus resource utilization, the adsorption characteristics of phosphorus in simulated wastewater and swine wastewater were studied with lanthanummodified Laminaria japonica(La-LJ), Ulva lactuca(La-UL), Rhodymenia palmata(La-RP) and Enteromorpha prolifera(La-EP). In simulated water, the adsorption capacities of four lanthanum-modified seaweeds decreased exponentially with the increase of dosage. With the increase of initial pH, the adsorption capacities of La-EP and La-UL increased, while the adsorption capacities of La-LJ and La-RP decreased. The kinetic processes and isothermal adsorption could be better fitted by the pseudo-second order kinetic model and Freundlich adsorption isotherm model, respectively. The maximum adsorption capacities of the four types of lanthanum-modified seaweeds were among 8.94～11.25 mg·g~(-1). Compared with pre-modification seaweeds, the adsorption capacities of La-LJ, La-UL, La-RP and La-EP increased by 24, 38, 66 and 25 times, respectively. Moreover, the phosphorus concentrations in the swine wastewater after adsorption were reduced to 2.5 mg·L~(-1), which could meet the corresponding discharge standard in China. Therefore, four types of lanthanum-modified seaweeds could be feasible to remove phosphorus from swine wastewater.
引文
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[26]LI Y,SONG S,XIA L,et al.Enhanced Pb(II)removal by algal-based biosorbent cultivated in high-phosphorus cultures[J].Chemical Engineering Journal,2019,361:167-179.
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[28]HUANG W,LI D,LIU Z,et al.Kinetics,isotherm,thermodynamic,and adsorption mechanism studies of La(OH)3-modified exfoliated vermiculites as highly efficient phosphate adsorbents[J].Chemical Engineering Journal,2014,236:191-201.
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[30]崔有为,李杰,杜兆富.镧、铈改性沸石对污水除磷性能和机制的比较研究[J].中国稀土学报,2016,34(4):460-468.
[31]施川,张盼月,郭建斌,等.污泥生物炭的磷吸附特性[J].环境工程学报,2016,10(12):7202-7208.
[2]LI J,DAVIS A P.A unified look at phosphorus treatment using bioretention[J].Water Research,2016,90:141-155.
[3]LIU T,CHEN X,WANG X,et al.Highly effective wastewater phosphorus removal by phosphorus accumulating organism combined with magnetic sorbent MFC@La(OH)3[J].Chemical Engineering Journal,2018,335:443-449.
[4]LI R,WANG J J,ZHOU B,et al.Simultaneous capture removal of phosphate,ammonium and organic substances by MgOimpregnated biochar and its potential use in swine wastewater treatment[J].Journal of Cleaner Production,2017,147:96-107.
[5]CHU Y,LI M,LIU J,et al.Molecular insights into the mechanism and the efficiency-structure relationship of phosphorus removal by coagulation[J].Water Research,2018,147:195-203.
[6]HUGGINS T M,HAEGER A,BIFFINGER J C,et al.Granular biochar compared with activated carbon for wastewater treatment and resource recovery[J].Water Research,2016,94:225-232.
[7]YIN H,YUN Y,ZHANG Y,et al.Phosphate removal from wastewaters by a naturally occurring,calcium-rich sepiolite[J].Journal of Hazardous Materials,2011,198:362-369.
[8]WAN C,DING S,ZHANG C,et al.Simultaneous recovery of nitrogen and phosphorus from sludge fermentation liquid by zeolite adsorption:Mechanism and application[J].Separation and Purification Technology,2017,180:1-12.
[9]JIANG Y,LI A,DENG H,et al.Characteristics of nitrogen and phosphorus adsorption by Mg-loaded biochar from different feedstocks[J].Bioresource Technology,2019,276:183-189.
[10]VIEIRA B R C,PINTOR A M A,BOAVENTURA R A R,et al.Arsenic removal from water using iron-coated seaweeds[J].Journal of Environmental Management,2017,192:224-233.
[11]RATHOD M,MODY K,BASHA S.Efficient removal of phosphate from aqueous solutions by red seaweed,Kappaphycus alverezii[J].Journal of Cleaner Production,2014,84:484-493.
[12]PANDIMURUGAN R,THAMBIDURAI S.Synthesis of seaweed-ZnO-PANI hybrid composite for adsorption of methylene blue dye[J].Journal of Environmental Chemical Engineering,2016,4(1):1332-1347.
[13]HASSELSTR?M L,VISCH W,GR?NDAHL F,et al.The impact of seaweed cultivation on ecosystem services:A case study from the west coast of Sweden[J].Marine Pollution Bulletin,2018,133:53-64.
[14]FU H,YANG Y,ZHU R,et al.Superior adsorption of phosphate by ferrihydrite-coated and lanthanum-decorated magnetite[J].Journal of Colloid and Interface Science,2018,530:704-713.
[15]DONG S,WANG Y,ZHAO Y,et al.La+3/La(OH)3 loaded magnetic cationic hydrogel composites for phosphate removal:Effect of lanthanum species and mechanistic study[J].Water Research,2017,126:433-441.
[16]DING S,SUN Q,CHEN X,et al.Synergistic adsorption of phosphorus by iron in lanthanum modified bentonite(Phoslock?):New insight into sediment phosphorus immobilization[J].Water Research,2018,134:32-43.
[17]XIE J,WANG Z,FANG D,et al.Green synthesis of a novel hybrid sorbent of zeolite/lanthanum hydroxide and its application in the removal and recovery of phosphate from water[J].Journal of Colloid and Interface Science,2014,423:13-19.
[18]刘志超,史晓燕,李艳根,等.镧改性粉煤灰及其脱氮除磷效果研究[J].化工新型材料,2018,46(2):205-208.
[19]刘香玉,孙娟,赵朝成,等.CTAB改性膨润土制备及其对海洋溢油的吸附性能[J].环境工程学报,2019,13(1):68-78.
[20]+张亚峰,安路阳,尚书,等.废玻璃/铝渣人工沸石对水中Ca2的吸附[J].环境工程学报,2019,13(1):49-61.
[21]NOVAIS S V,ZENERO M D O,TRONTO J,et al.Poultry manure and sugarcane straw biochars modified with MgCl2 for phosphorus adsorption[J].Journal of Environmental Management,2018,214:36-44.
[22]胡家朋,吴代赦,刘瑞来,等.羟基镧改性树脂的制备及其对氟离子的吸附[J].安全与环境学报,2016,16(5):237-241.
[23]ZHOU A,ZHU C,CHEN W,et al.Phosphorus recovery from water by lanthanum hydroxide embedded interpenetrating network poly(vinyl alcohol)/sodium alginate hydrogel beads[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2018,554:237-244.
[24]林丽丹,王哲,顾伟,等.沸石/水合氧化锆吸附水中的磷[J].环境工程学报,2017,11(2):702-708.
[25]杨金梅,吕建波,李莞璐,等.壳聚糖载纳米羟基氧化铁对水中磷的吸附[J].环境工程学报,2018,12(5):1286-1294.
[26]LI Y,SONG S,XIA L,et al.Enhanced Pb(II)removal by algal-based biosorbent cultivated in high-phosphorus cultures[J].Chemical Engineering Journal,2019,361:167-179.
[27]LUO H,ZENG X,LIAO P,et al.Phosphorus removal and recovery from water with macroporous bead adsorbent constituted of alginate-Zr+4and PNIPAM-interpenetrated networks[J].International Journal of Biological Macromolecules,2019,126:1133-1144.
[28]HUANG W,LI D,LIU Z,et al.Kinetics,isotherm,thermodynamic,and adsorption mechanism studies of La(OH)3-modified exfoliated vermiculites as highly efficient phosphate adsorbents[J].Chemical Engineering Journal,2014,236:191-201.
[29]石稳民,付有为,许智,等.镧负载多孔陶粒用于低浓度含磷废水的处理[J].环境科学与技术,2018,41(11):110-114.
[30]崔有为,李杰,杜兆富.镧、铈改性沸石对污水除磷性能和机制的比较研究[J].中国稀土学报,2016,34(4):460-468.
[31]施川,张盼月,郭建斌,等.污泥生物炭的磷吸附特性[J].环境工程学报,2016,10(12):7202-7208.