Heavy metals in an impacted wetland system: A typical case from southwestern China

2007 ◽  
Vol 387 (1-3) ◽  
pp. 257-268 ◽  
Author(s):  
Xiangyang Bi ◽  
Xinbin Feng ◽  
Yuangen Yang ◽  
Xiangdong Li ◽  
Grace P.Y. Sin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Typical Case ◽  
Southwestern China ◽  
System A ◽  
Wetland System

Municipal wastewater treatment with pond–constructed wetland system: a case study

2005 ◽  
Vol 51 (12) ◽  
pp. 325-329 ◽  
Author(s):  
X. Wang ◽  
X. Bai ◽  
J. Qiu ◽  
B. Wang
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Oxidation Pond ◽  
System A ◽  
Treated Effluent ◽  
Wetland System ◽  
Oxidation Ponds ◽  
Better Than

The performance of a pond–constructed wetland system in the treatment of municipal wastewater in Kiaochow city was studied; and comparison with oxidation ponds system was conducted. In the post-constructed wetland, the removal of COD, TN and TP is 24%, 58.5% and 24.8% respectively. The treated effluent from the constructed wetland can meet the Chinese National Agricultural and Irrigation Standard. The comparison between pond–constructed wetland system and oxidation pond system shows that total nitrogen removal in a constructed wetland is better than that in an oxidation pond and the TP removal is inferior. A possible reason is the low dissolved oxygen concentration in the wetland. Constructed wetlands can restrain the growth of algae effectively, and can produce obvious ecological and economical benefits.

Design and Implementation of LED Display Screen Controller Based on STM32 and FPGA

2012 ◽  
Vol 268-270 ◽  
pp. 1578-1582
Author(s):  
Chi Zhang ◽  
Xiao Guang Wu ◽  
Cheng Jun Zhang
Keyword(s):  
Data Transmission ◽  
Controller Design ◽  
Typical Case ◽  
Excellent Performance ◽  
Point Light Source ◽  
Drive Unit ◽  
System A ◽  
Ping Pong ◽  
Point Light ◽  
Sd Card

In order to realize point-light-source and hurdle lamp LED displays system, a kind of LED display screen controller design based on FPGA and STM32 is introduced by this paper. This design can quickly and easily receive display the data from USB, Ethernet and SD card interfaces through the STM32 processor, and use FPGA to realize data transmission throughput big operation of stable display by double RAM Ping-Pong operation This paper gives drive unit timing for TM1809 series LED drive chip as typical case. This design has applied to LED display controller with stability of reading data and excellent performance.

BTEX degradation in a cold-climate wetland system

2005 ◽  
Vol 51 (9) ◽  
pp. 165-171 ◽  
Author(s):  
S. Wallace ◽  
R. Kadlec
Keyword(s):  
Pilot Scale ◽  
Full Scale ◽  
Cold Climate ◽  
System A ◽  
Degradation Rates ◽  
Mass Load ◽  
Hydraulic Load ◽  
In Series ◽  
Benzene Toluene ◽  
Wetland System

A pilot-scale subsurface vertical-flow wetland system was constructed at the former BP Refinery in Casper, Wyoming in order to determine benzene, toluene, ethylbenzene and xylene (BTEX) degradation rates in a cold-climate application. The pilot system, consisting of 4 cells, each dosed at a nominal flow rate of 5.4 cubic metres per day, was operated between August and December 2002. The pilot tested the effects of wetland mulch and aeration on system performance. Areal rate constants (kA values) were calculated based on an assumed three tanks in series (3TIS). The presence of wetland sod and aeration both improved treatment performance. Mean kA values were 244 m/yr for cells without sod or aeration, and improved to 356 m/yr for cells with sod and aeration. Based on the results of the pilot system, a full-scale wetland system (capable of operating at 6,000 m3/day) was started up in May 2003. The full-scale system achieved permit compliance within one week of startup, but is currently being loaded at only 45% of the design hydraulic load, and 15% of the design BTEX mass load, resulting in a mean kA value of ∼350 m/yr.

Speciation and accumulation pattern of heavy metals from soil to rice at different growth stages in farmland of southwestern China

2020 ◽  
Vol 27 (28) ◽  
pp. 35675-35691 ◽  
Author(s):  
Zhenming Zhang ◽  
Xianliang Wu ◽  
Qiusheng Wu ◽  
Xianfei Huang ◽  
Jiachun Zhang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Southwestern China ◽  
Growth Stages ◽  
Accumulation Pattern ◽  
Different Growth Stages

scholarly journals Distribution of heavy metals in the core sediments of a tropical wetland system

2009 ◽  
Vol 6 (2) ◽  
pp. 225-232 ◽  
Author(s):  
P. S. Harikumar ◽  
U. P. Nasir ◽  
M. P. Mujeebu Rahman
Keyword(s):  
Heavy Metals ◽  
Core Sediments ◽  
The Core ◽  
Wetland System

Contamination and health risks of soil heavy metals around a lead/zinc smelter in southwestern China

2015 ◽  
Vol 113 ◽  
pp. 391-399 ◽  
Author(s):  
Peizhong Li ◽  
Chunye Lin ◽  
Hongguang Cheng ◽  
Xiaoli Duan ◽  
Kai Lei
Keyword(s):  
Heavy Metals ◽  
Health Risks ◽  
Southwestern China ◽  
Soil Heavy Metals ◽  
Zinc Smelter ◽  
Lead Zinc

Biodegradation and kinetics of organic compounds and heavy metals in an artificial wetland system (AWS) by using water hyacinths as a biological filter

2018 ◽  
Vol 20 (1) ◽  
pp. 35-43 ◽  
Author(s):  
P. F. Rodríguez-Espinosa ◽  
J. A. Mendoza-Pérez ◽  
J. Tabla-Hernandez ◽  
E. Martínez-Tavera ◽  
M. M. Monroy-Mendieta
Keyword(s):  
Heavy Metals ◽  
Organic Compounds ◽  
Artificial Wetland ◽  
Biological Filter ◽  
Wetland System ◽  
Water Hyacinths ◽  
Kinetics Of

scholarly journals Distribution of heavy metals in various compartments of the constructed wetland system in Przywidz

2019 ◽  
pp. 297-305
Author(s):  
Hanna Obarska-Pempkowiak ◽  
Katarzyna Klimkowska
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Point Of View ◽  
Filling Material ◽  
Toxic Heavy Metals ◽  
Wetland System ◽  
Cascade Filter ◽  
The Hill

In the last decade constructed wetlands have become a very popular technology for removal of contaminants from domestic sewage. They are also assesed from the point of view of their capacity for removal of toxic heavy metals and organic substances resistant to degradation. Constructed wetland in Przywidz localized about 60 km from Gdansk is a pilot wastewater treatment plant (WWTP) designed for 150 PE (person equivalent). The system consists of two sections: vegetated submerged bed (VSB) with horizontal flow of sewage and a cascade filter situated on a slope of a hill. Domestic sewage after a conventional pretreatment ( consists of an Imhoff tank and a trickling filter) is pumped to the VSB filter located on slope of the hill. Total area of constructed wetland is about 870 m2. In the period 1995-98 the measurments of several heavy metals (Cd, Cu, Pb) were carried out. These measurments were carried out in inflowing and outflowing sewage and as well in samples collected from each section of constructed wetland system. In particular analysis of sediment collected in ditches of the cascade filter, filling material of the dykes, VSB filter and plants were carried out. It was found out that content of heavy metals in suspended soil decreased along the course of treatment, starting from VSB filter, through the first ditch to the last ditch. Measurable concentration of dissolved heavy metals were found in sewage collected from several subsequent ditches. The main mechanism of removal on particular matter in subsequent ditches was sorption.

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