Earticle

초록

영어

Constructed wetlands and other aquatic systems have been successfully used for waste and wastewater treatment in either temperate or tropical regions. To treat waste or wastewater in a sustainable manner, the integrated eco-engineering designs are explained in this paper with 2 case studies: (i) a combination of vertical-flow constructed wetland (CW) with plant irrigation systemfor fecal sludge management and (ii) integrated CW units with landscaping at full-scale application for domestic wastewater treatment. The pilot-scale study of fecal sludge management employed 3 vertical-flow CW units, each with a dimension of 5 x 5 x 0.65 m (width x length x media depth) and planted with cattails (Typha augustifolia). At the solid loading rate of 250 kg total solids (TS)/m2.yr and a 6-day percolate impoundment, the CW system could achieve chemical oxygen demand (COD), TS and total Kjeldahl nitrogen (TKN) removal efficiencies in the range of 80 - 96%. The accumulated sludge layers of about 80 – 90 cm was found at the CW bed surface after operating the CW units for 7 years, but no clogging problem has been observed. The CW percolate was applied to 16 irrigation Sunflower plant (Helianthus annuus) plots, each with a dimension of 4.5 x 4.5 m (width x length). In the study, the CW percolate were fed to the treatment plots at the application rate of 7.5 mm/day but the percolate was mixed with tap water at different ratio of 20%, 80% and 100%. Based on a 1-year data of 3-crop plantation were experimented, the contents of Zn, Mn and Cu in soil of the experimental plots were found to increase with increasing in CW percolate ratios. The highest plant biomass yield and oil content of 1,000 kg/ha and 35%, respectively, were obtained from the plots fed with
20% or 50% of the CW percolate, whereas no accumulation of heavy metals in the plant tissues (i.e. leaves, stems and flowers) of the sunflower is found. In addition to the pilot-scale and field experiments, a case study of the integrated CW systems for wastewater treatment at Phi Phi Island (a Tsunami-hit area), Krabi province, Thailand is illustrated. The 5,200-m2 CW systems on Phi Phi Island are not only for treatment of 400 m3/day wastewater from hotels, households or other domestic activities, but also incorporating public consultation in the design processes,
resulting in introducing the aesthetic landscaping as well as reusing of the treated effluent for irrigating green areas on the Island.

목차

Abstract
 Introduction
 Materials and Methods
  Experimental Setup
 Results and Discussion
  Pilot-scale CW units treating FS and sunflower plant irrigation
  Mass Balances in CW units
  Characteristics of accumulated sludge
  Sunflower seed yields and oil contents
  Soil characteristics
  Soil characteristics
  Rehabilitation of wastewater treatment system on Phi Phi Island
 Conclusions
 References

키워드

저자

• Thammarat Koottatep [ School of Environment, Resources and Development (SERD) Asian Institute of Technology ] Corresponding author
• Chongrak Polprasert [ School of Environment, Resources and Development (SERD) Asian Institute of Technology ]
• Carsten H. Laugese [ Capacity Development of Wastewater Management Authority (CD-WMA) Ministry of Natural Resources and Environment ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국습지학회지 [韓國濕地學會誌]

• 간기

  계간

• pISSN

  1229-6031

• eISSN

  2384-0056

• 수록기간

  1999~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 472 DDC 570