A New Method for the Identification of Infiltration Waters in Sanitary Flows

1993 ◽  
Vol 27 (12) ◽  
pp. 227-230 ◽  
Author(s):  
M. A. Verbanck
Keyword(s):  
Domestic Sewage ◽  
Water Infiltration ◽  
New Method ◽  
Clear Water ◽  
Sewer Systems ◽  
And Control

Extraneous clear water infiltration can significantly distort the operation and control of sewer systems. A method using the borate components dissolved in domestic sewage is outlined which enables the scale of any such problems to be well specified.

scholarly journals Study On Setting Method of Flatness Target Curve of SUNDWIG 20-High Mill Considering Target Crown

2021 ◽  
Author(s):  
Jianliang Sun ◽  
Mingze Yan ◽  
Mingyuan Li ◽  
Tongtong Hao
Keyword(s):  
Control Theory ◽  
Cold Rolling ◽  
Hot Rolling ◽  
New Method ◽  
Discrimination Model ◽  
Flatness Control ◽  
Simulation Results ◽  
The Stability ◽  
And Control

Abstract The flatness target curve is important in the flatness control theory. The accuracy of flatness target curve is an important factor to determine the load of flatness control means and flatness quality. Aiming at the defect that crown of each pass after rolling cannot be controlled quantitatively in the traditional target curve formulation of cold rolling, a new method considering the target crown was proposed. Specifically, the target crown of each pass can be set by combining the total proportional crown change in hot rolling field to each pass and the instability discrimination model in cold rolling field. the total proportional crown change of incoming material and finished product is allocated to each pass, and the instability discrimination model is applied to ensure the stability of the plate. The purpose of new method is to control of the crown of each pass quantitatively, so that the flatness and thickness of plate can meet the production requirements. Taking SUNDWIG 20-high mill and typical rolling products as an example, the simulation results show that, on the basis of ensuring the flatness and obtaining the minimum available crown after rolling, the model can make the flatness and crown meet the production requirements at the same time and control the crown of each pass after rolling quantitatively by setting the target crown of each pass.

Infiltration Characteristics of Topsoil in Reclamation Farmland Filled with Yellow River Sediment

2014 ◽  
Vol 988 ◽  
pp. 498-501
Author(s):  
Fang Shao ◽  
Dong Wen Liu ◽  
Shu Jiang ◽  
Zhi Yong Qiao ◽  
Shan Lin
Keyword(s):  
River Sediment ◽  
Yellow River ◽  
Infiltration Rate ◽  
Water Infiltration ◽  
First Year ◽  
Infiltration Process ◽  
Important Indicator ◽  
The Third ◽  
Yellow River Sediment ◽  
And Control

Infiltration is an important indicator of water and nutrient holding capacity of soil. Lap infiltration apparatus was used to measure vertical water infiltration process in the third year of Yellow River sediment filling reclamation. Five infiltration models were selected to fit the infiltration characteristic curves, analyzed the infiltration experimental results during 3 years of reclamation. The results showed that, the mean initial infiltration rate and mean stable infiltration rate of filling farmland in the third year were 17.06mm/min and 2.38mm/min, and were 8.81mm/min and 0.99 mm/min higher than that of the first year, 3.58mm/min and 0.39mm/min higher than that of the second year. It indicated that, infiltration rate of filling farmland increased significantly after cultivation due to the farming practices and roots development, and the role of soil microorganisms and small animals. Filling farmland has some self-recovery capabilities. In addition, Kostiakov model has better fitting effect than Mezencev model for both filling farmland and control farmland.

Constructed wetlands for wastewater treatment in the Czech Republic

2001 ◽  
Vol 44 (11-12) ◽  
pp. 369-374 ◽  
Author(s):  
J. Vymazal
Keyword(s):  
Wastewater Treatment ◽  
Czech Republic ◽  
Common Reed ◽  
Domestic Sewage ◽  
Horizontal Flow ◽  
Reed Canarygrass ◽  
The Czech Republic ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Under Construction

The first constructed wetland (CW) for wastewater treatment was built in the Czech Republic in 1989. This recent survey shows that at the end of 1999 101 systems are in operation and several more are under construction. 95 CWs are designed with sub-surface horizontal flow, 6 systems are hybrid with a combination of vertical and horizontal flow beds. Most systems (56) were designed for the treatment of municipal and domestic sewage while 38 CWs were designed for the treatment of wastewater from combined sewer systems. The most commonly used size of vegetated beds is 1,001-2,500 m2 (31 systems) followed by the area between 51-250 m2 (19%). The area of vegetated bed of the largest system is 4,493 m2. Size distribution is quite evenly spread from very small systems (PE = 3 or 4) up to 1,000 PE. However, most systems (44) were sized to treat wastewater from sources between 101 and 500 PE. The most commonly used macrophyte is Common reed (Phragmites australis) which is used in 34 systems as a monotypic stand and in 44 systems in combination with other macrophytes, most frequently with Reed canarygrass (Phalaris arundinacea) (31 systems) and cattails (Typha spp.) (8 systems).

Odour emission capacity of wastewaters - standardization of measurement method and application

1998 ◽  
Vol 38 (3) ◽  
pp. 61-69 ◽  
Author(s):  
Franz-Bernd Frechen ◽  
Wulf Köster
Keyword(s):  
Wastewater Treatment ◽  
Liquid Phase ◽  
Case Studies ◽  
Mass Flow ◽  
Measurement Method ◽  
Wastewater Treatment Plants ◽  
Ambient Air ◽  
New Method ◽  
Sewer Systems ◽  
Emission Capacity

Odorous emissions from sewer systems and wastewater treatment plants can cause serious annoyance in the vicinity. Odorants which are present in a liquid phase are emitted into ambient air at the liquid-gaseous interface. The amount and the variation of emitted mass flow of odorants is significantly influenced by the amount of odorants which are present in the liquid. Up to now, however, no measurement method was available to describe this parameter, which can be called “Odorants Emission Capacity”. The paper describes a standardized method of determining the “Odorants Emission Capacity” and shows results and consequences from several case studies where this new method was applied.

A new method to estimate soil water infiltration based on a modified Green–Ampt model

2016 ◽  
Vol 161 ◽  
pp. 31-37 ◽  
Author(s):  
Lili Mao ◽  
Yuzhong Li ◽  
Weiping Hao ◽  
Xiaoni Zhou ◽  
Chunying Xu ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Infiltration ◽  
New Method ◽  
Soil Water Infiltration
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