POTENTIAL USE OF CONSTRUCTED WETLANDS FOR WASTE-WATER TREATMENT IN NORTHERN ENVIRONMENTS

被引:111
作者
JENSSEN, PD [1 ]
MAEHLUM, T [1 ]
KROGSTAD, T [1 ]
机构
[1] AGR UNIV NORWAY,DEPT SOIL SCI,N-1432 AS,NORWAY
关键词
ECOLOGICAL ENGINEERING; CONSTRUCTED WETLANDS; REED BEDS; WASTE-WATER TREATMENT; COLD CLIMATE; SOIL TYPE; PHOSPHORUS REMOVAL; NITROGEN REMOVAL; SYSTEM DESIGN;
D O I
10.2166/wst.1993.0223
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Constructed wetlands consist of soil filled beds with aquatic plants. Wastewater is treated when flowing through these beds. It has been questioned if constructed wetlands will be able to operate when subjected to cold conditions in sub arctic regions. Experience from Norway indicates that significant biological activity occurs at temperatures between 0 and 5-degrees-C, and that high removal rates of nutrients and organic matter are achieved in ponds and soil amended with wastewater at these temperatures. Results from using constructed wetlands in Denmark, Sweden and North America show that winter performance is not significantly reduced as compared to other seasons, but in order to obtain high removal of organic matter and nitrogen in cold climates aerobic pretreatment is probably a prerequisite. Cold climates may also require careful installation of larger and deeper systems with a longer detention time. Results of 15 months operation of a Norwegian multi-stage constructed wetland pilot plant optimised for nutrient removal, show 55% nitrogen and 98% phosphorus removal. The large phosphorus removal is obtained by using sand with a high content of iron oxides and a fabricated porous medium that has a high phosphorus adsorption capacity. It remains to be seen if long term cost efficient phosphorus removal can be obtained in constructed wetlands. The results indicate that properly designed constructed wetlands can operate satisfactorily in a cold climate. When adequate design criteria are developed several possible applications exist for these simple low maintenance systems as main treatment system, or in conjunction with other treatment methods.
引用
收藏
页码:149 / 157
页数:9
相关论文
共 20 条
[1]  
Armstrong W., 1990, USE CONSTRUCTED WETL, P41
[2]  
BRIX H, 1989, AMBIO, V18, P100
[3]  
BRIX H, 1990, CONSTRUCTED WETLANDS, P41
[4]  
CONLEY LM, 1991, RES J WATER POLLUT C, V63, P239
[5]   ROLE OF AQUATIC PLANTS IN WASTE-WATER TREATMENT BY ARTIFICIAL WETLANDS [J].
GERSBERG, RM ;
ELKINS, BV ;
LYON, SR ;
GOLDMAN, CR .
WATER RESEARCH, 1986, 20 (03) :363-368
[6]  
GUMBRICHT T, 1991, TRITA KUT91 ROYAL I, P1064
[7]  
Hammer DA., 2020, CONSTRUCTED WETLANDS, DOI 10.1201/9781003069850
[8]  
HERSKOWITZ J, 1986, RR128 ONT MIN ENV PR
[9]  
Hofmann K., 1991, Ecological engineering for wastewater treatment. Proceedings of the International Conference held at Stensund Folk College, Sweden, March 24-28, 1991., P248
[10]  
JENSSEN PD, 1991, JUL P INT SEM TECHN, P160