TITLE:
Strategy & Techniques for Restoration of Healthy Aquaecosystem from Toxic Super Eutrophic Water Body
AUTHORS:
Peimin Pu, Jiangping Pu
KEYWORDS:
Restoration of Healthy Aquaecosystem, Toxic Water Body, Electronic Pulse Technique for Decomposition Esters, Photosensitization for Decomposition of Organic Matters, Floating Eco-Islands, Immobilized Nitrogen Cycle Bacteria
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.3 No.6,
August
25,
2015
ABSTRACT:
There are complex river-lake systems in the
Taihu Lake catchment with total water surface area of 6174.7 km2, and
population density of 1079/km2, including Taihu Lake water surface area of 2338
km2. The water systems in this catchment have healthy aquaecosystems during
long history. However, in some riverlets in this catchment the water quality was
estimated as “acute toxicity for higher organisms” and over standards for many
heavy metal elements content; there were no any living plants and macro
organisms in the water body, because there were developed a series of industry
with abundant release of heavy metals and difficult decomposition organic chemical
components along the riverlets during last decades. The even more serious
situation was observed in sediments of the riverlets. How to restore such
riverlet into a healthy aquaeosystem with abound plants and higher organisms?
The main strategy and techniques are described in this paper as summarizing a report
of engineering in a riverlet in Wuxi New District during last years, which
leads to restore the aquaecosystem into a healthy one with abundant surface
plant cultured on floating islands and observed living fish, lobster, frog,
toad, mollusk and others in the riverlet. The main techniques are: 1) softwall
buffer technic; 2) floating eco-island technic by using which can culture any
plant which can be cultured in solution; 3) immobilized nitrogen cycle bacteria
(INCB) technic; 4) tattering esters and other big-molecule organic chemicals by
using electronic pulse technic and photosensitization technic; 5) mist spray
facility technic for improving dissolved oxygen in deep water layers; 6)
technic for buffering and suppressing H2S release from water; 7) the appropriate
portion of surface with cultured plant to the total water surface area is about
1/3; 8) Cress [Oenanthe Ljavanica (Bl.) DC.] and Myriophyllum verticilatum L.
may be cultured in Taihu Lake catchment during the whole year as main plants
with mosaic combination of other supplement plants in different seasons.