Assessment of Water Quality and Fish Production in an Intensive Pond Aquaculture System

2018 ◽  
Vol 61 (4) ◽  
pp. 1425-1433 ◽  
Author(s):  
Weijun Bao ◽  
Songming Zhu ◽  
Shuirong Guo ◽  
Li Wang ◽  
Han Fang ◽  
...  
Keyword(s):  
Water Quality ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Suspended Solids ◽  
Economic Benefits ◽  
Production Cycle ◽  
Cost Ratio ◽  
Pond Aquaculture ◽  
Aquaculture System

Abstract. Pond aquaculture plays a major role in world aquaculture production, especially in China. To make pond aquaculture more precise, ecologically sound, and efficient, in this study, an intensive pond aquaculture system (IPAS) was designed and built to produce freshwater fish that are commonly reared in China. Aquatic plants and filter-feeding, omnivorous fish were used to rehabilitate the aquaculture water quality, and the particle size distribution (PSD) model of suspended solids in the pond raceways was investigated. The results showed that the water quality in the purification pond was improved compared to that in the sedimentation basins, and it was close to the water quality in the raceways, which were within the acceptable range. The number distribution of suspended solids can be described by the power law model (R2 = 0.901 ± 0.032), which can provide guidance for solids removal using different methods. Moreover, during one production cycle, economic benefits of the IPAS were also evaluated; the return on investment (ROI) of 35.69% and benefit cost ratio (BCR) of 1.36 indicated that this kind of aquaculture mode has achieved a better profit. There are many fish species in China, so developing an IPAS with a wide application range requires further study in the future. Keywords: Airlift push-water aerator, Aquatic plant, Drum filter, Intensive pond aquaculture system, Particle size distribution, Purification pond.

Dynamic behavior of suspended pollutants and particle size distribution in highway runoff

2002 ◽  
Vol 46 (11-12) ◽  
pp. 413-418 ◽  
Author(s):  
H. Furumai ◽  
H. Balmer ◽  
M. Boller
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Suspended Solids ◽  
Dynamic Change ◽  
First Flush ◽  
Highway Runoff ◽  
Runoff Rate ◽  
Highway Drainage

Continuous runoff quality monitoring was conducted for one month at urban highway drainage with an area of 8.4 ha. Dynamic change of suspended solids and heavy metal concentrations were investigated during first flush periods, taking the particle size distribution into consideration. Except for Pb, the concentrations of TSS and heavy metals in runoff were within the range of the EMC reported in recent highway runoff research. Particle-bound heavy metals (Zn, Pb, and Cu) accounted for more significant pollutant loads than soluble fractions. Their content decreased with increasing total SS concentration in runoff samples. The results of particle size distribution (PSD) analysis of runoff samples indicate that high TSS concentration samples contained coarser particles. Based on the PSD results, a stepwise wash-off phenomenon of TSS under varying runoff rate conditions was explained by the different washoff behavior of fine (< 20 mm) and coarser particles.

Water quality characterization in real biofilm wastewater treatment systems by particle size distribution

2010 ◽  
Vol 101 (21) ◽  
pp. 8038-8045 ◽  
Author(s):  
Juan J. García-Mesa ◽  
José M. Poyatos ◽  
Fernando Delgado-Ramos ◽  
María M. Muñio ◽  
Francisco Osorio ◽  
...  
Keyword(s):  
Water Quality ◽  
Particle Size ◽  
Wastewater Treatment ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Wastewater Treatment Systems

scholarly journals Particle Size Distribution of Cemented Rockfill Effects on Strata Stability in Filling Mining

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 407 ◽  
Author(s):  
Jiangyu Wu ◽  
Meimei Feng ◽  
Jingmin Xu ◽  
Peitao Qiu ◽  
Yiming Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
Rock Mass ◽  
Particle Size Distribution ◽  
Coal Seam ◽  
Size Distribution ◽  
Longwall Mining ◽  
Poisson Ratio ◽  
Triaxial Compression ◽  
Friction Angle ◽  
Economic Benefits

It is of great significance for engineering safety, economic benefits, environmental protection, and sustainable development to investigate the strata stability in filling mining with cemented rockfill. Consequently, this paper is based on a specific coal mine where we applied the fully-mechanized longwall mining and filling and designed a cemented rockfill material for which the particles satisfied the Talbot gradation. Uniaxial and triaxial compression experiments were carried out on the cemented rockfill specimen, which obtained the relations between the mechanical parameters (Poisson ratio, elastic modulus, compressive strength, cohesive force, internal friction angle, and tensile strength) and the particle size distribution of the aggregate. The excavation and filling processes in the coal seam were simulated based on the numerical software FLAC3D. The characteristics of the displacement and stress fields of the strata when the goaf was filled by cemented rockfill with different granule gradations were discussed. The influences of the particle size distribution and mining distance on the maximum subsidence displacement of the coal seam roof, internal stress of the backfill, and the stress of the rock mass in the coalface were analyzed. The feasibility and effectiveness of the filling mining with cemented rockfill to protect the integrity of the overlying strata were discussed. The results showed that optimizing the particle size distribution of the aggregate in cemented rockfill could increase the loading capacity of the backfill to improve the filling effect, effectively control the strata movement, and decrease the stress of rock mass in the coalface to reduce the potential danger.

Justification of parameters and technology of drilling and blasting operations to ensure the required lumpiness

2021 ◽  
pp. 110-115
Author(s):  
V.V. Egorov ◽  
A.N. Volokitin ◽  
N.V. Ugolnikov ◽  
A.V. Sokolovsky
Keyword(s):  
Particle Size ◽  
Rock Mass ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Design Stage ◽  
Production Cycle ◽  
Lump Size ◽  
Optimal Technology ◽  
Average Size ◽  
The Cost

The practice of mining and blasting operations both during the development of a mineral deposits, and at the mine design stage, often involves the question of selecting the technology options and operation parameters. Virtually all recommendations for selecting the best production option are based on minimizing the total costs for the entire technological cycle of mining activities. In most cases the optimal technology and parameters of mining and blasting operations depend on the commercial, maximum permissible and average size of the blasted rock mass, which are determined by the type and capacity of the mining haulage equipment. Therefore, the total costs will mainly depend on the commercial or average lump size and the cost of mining transport equipment. The article presents a methodology to select the best technological option for the drilling and blasting operations to obtain the optimal lumpiness (particle-size distribution) of the blasted rock. The optimal range of lumpiness is defined by the total minimum costs for the entire production cycle of mining and processing of minerals. In order to select a rational technology of drilling and blasting and to calculate their parameters it is proposed to take into account the integral criteria of lumpiness in addition to the average lump size. For this purpose, we studied the particle size distribution in the rock mass and in the muck piles.

Effect of Filter Media Particle Size Distribution on Filtration Efficiency

1998 ◽  
Vol 33 (4) ◽  
pp. 589-594 ◽  
Author(s):  
F. Amini ◽  
H.V. Truong
Keyword(s):  
Water Quality ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Removal Efficiency ◽  
Scale Model ◽  
Filter Media ◽  
Sand Filter ◽  
Sediment Removal ◽  
Filter Water

Abstract The results of an experimental study of a sand filter water quality model are presented. The model is built to represent an underground confined water quality sand filter structure. Three types of sands, namely fine, medium and coarse, were used to study the effect of filter media particle size distribution on sediment removal efficiency. The results indicated that the sediment removal efficiency for all sand types decreased with time. The use of medium sand provided the scale model filter with the highest sediment removal efficiency. The finding of this study indicates that the media grain size has a measurable effect on the efficiency of the sand filter water quality structure.

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