Abstract
Emergent incident of fish kill was occurred in the detention pond of natural water purification system. The objective of this study was revealed the cause of the incident.Novel measurements unprecedentedly employed in this study including SOD to measure sediment oxygen decay PCR to find out sediment microbial activity, SEM, EDX, and FTIR to view the macrophyte rhiyphere root surface to understand the pollutant adsorption. Algal bloom was the main reason to induce serious fish kill Particle size analysis demonstrated greater particles were setting in the upstream.Chlorophyll A, COD, SS, phosphorus, E coli was in descending of following the stream direction. The end of measuring point, detention pond, demonstrated the serious eutrophication which leads to diurnal pH and DO fluctuation to induce anoxic condition at night which induced fish kill. Sediment oxygen uptake (SOD) also measure to fine vertical oxygen profile. SEM, EDX, and FTIR results indicated the major functional groups of submergent macrophyte reed root were carboxyl, carbonyl, and phenol which could adsorp various pollutants.
Highlights
Constructed wetlands, nature water purification systems and novel green remediation approaches, have commonly employed in Taiwan and worldwide for water polishing.Several constructed wetlands have been listed as nation wetlands and to be special protected and managed
To our best literature review, none if any conducted the following novel measurements unprecedentedly employed in constructed wetland including SOD to measure sediment oxygen decay PCR to find out sediment microbial activity, SEM, Energy Dispersive X-ray (EDX), and FTIR to view the macrophyte rhizhere root surface to understand the pollutant adsorption
Fish kill was commonly occurred in the detention pond and surface flow wetland due to algal bloom
Summary
Constructed wetlands, nature water purification systems and novel green remediation approaches, have commonly employed in Taiwan and worldwide for water polishing.Several constructed wetlands have been listed as nation wetlands and to be special protected and managed. Constructed wetlands have long been a black box and pollution degradation was not revealed.Recently, numerous studies have conducted to reveal the black box. A serious fish kill occurred in the University detention pond which induced water quality was significantly reduced. The university suspected toxic algae was the cause of fish kill. An investigation project was initiated to scrutinize fish kill and proposal of water related monitoring was conducted. The objective of this study was aiming to the oxygen status in the wetland system and the myth of fish kill. To our best literature review, none if any conducted the following novel measurements unprecedentedly employed in constructed wetland including SOD to measure sediment oxygen decay PCR to find out sediment microbial activity, SEM, EDX, and FTIR to view the macrophyte rhizhere root surface to understand the pollutant adsorption. By virtue of aforementioned resulted, real cause of fish kill can be revealed
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