Quantitatively updating sewage discharge standard of wastewater treatment plants: starting from the estimation of water environment capacity

2018 ◽  
Vol 135 ◽  
pp. 381-391
Author(s):  
Lixun Zhang ◽  
Yuntao Guan
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Water Environment ◽  
Sewage Discharge ◽  
Environment Capacity ◽  
Water Environment Capacity

scholarly journals Nitrogen and Phosphorous Removal in Municipal Wastewater Treatment Plants in China: A Review

2010 ◽  
Vol 2010 ◽  
pp. 1-10 ◽  
Author(s):  
Yong Qiu ◽  
Han-chang Shi ◽  
Miao He
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Water Environment ◽  
Optimization Techniques ◽  
Municipal Wastewater Treatment ◽  
Real Time Control ◽  
Operational Optimization ◽  
Municipal Wastewater Treatment Plants

Surface water environment in China was degraded rapidly in the last two decades, resulting in increasingly tighten criteria issued for municipal wastewater treatment plants (WWTPs). This paper reviewed the recent advances of process design and operational optimization for nutrients removal. Three major processes, as anaerobic-anoxic-oxic (AAO) process, oxidation ditch (OD), and sequencing batch reactor (SBR) occupied 65% of WWTPs amounts and 54% of treatment volumes of China in 2006. However conservative process designs and operational faults often impaired the process performances and energy efficiency. Therefore, typical processes were modified, combined, and innovated to meet the requirements of the diverse influent characteristics and lower energy consumptions. Furthermore, operational optimization techniques by modeling, simulation, and real-time control were also developed and applied in China to improve the process operation. Although great efforts had been contributed to improve the WWTPs performances in China, attentions should be continuously paid to the introduction, instruction, and implementation of advanced techniques. At last, the technical demands and appropriated techniques of WWTPs in China were briefly discussed.

scholarly journals Analysis on Water Environment Capacity of the Poyang Lake

2011 ◽  
Vol 10 ◽  
pp. 2754-2759 ◽  
Author(s):  
Yan Bangyou ◽  
Xing Jiusheng ◽  
Tan Huiru ◽  
Deng Shaoping ◽  
Tan Yinning
Keyword(s):  
Poyang Lake ◽  
Water Environment ◽  
Environment Capacity ◽  
Water Environment Capacity

scholarly journals Water Supply-Water Environmental Capacity Nexus in a Saltwater Intrusion Area under Nonstationary Conditions

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 346
Author(s):  
Dedi Liu ◽  
Yujie Zeng ◽  
Yue Qin ◽  
Youjiang Shen ◽  
Jiayu Zhang
Keyword(s):  
Water Quality ◽  
Water Supply ◽  
Saltwater Intrusion ◽  
Water Environment ◽  
Environmental Capacity ◽  
Freshwater Flow ◽  
Environment Capacity ◽  
Water Environmental Capacity ◽  
Water Environment Capacity ◽  
Supply Water

Due to water supply increase and water quality deterioration, water resources are a critical problem in saltwater intrusion areas. In order to balance the relationship between water supply and water environment requirements, the nexus of water supply-water environment capacity should be well understood. Based on the Saint–Venant system of equations and the convection diffusion equation, the water supply-water environment capacity nexus physical equation is determined. Equivalent reliability is employed to estimate the boundary design water flow, which will then lead to a dynamic nexus. The framework for determining the nexus was then applied to a case study for the Pearl River Delta in China. The results indicate that the water supply-water environment capacity nexus is a declining linear relationship, which is different from the non-salt intrusion and tide-impacted areas. Water supply mainly relies on freshwater flow from upstream, while water environmental capacity is affected by both the design freshwater flow and the water levels at the downstream boundary. Our methods provide a useful framework for the quantification of the physical nexus according to the water quantity and water quality mechanisms, which are useful for freshwater allocation and management in a saltwater intrusion area or the tail area of cascade reservoirs.

scholarly journals Energy Benchmarking and Optimization of Wastewater Treatment Plants in Greece

2020 ◽  
Vol 2 (1) ◽  
pp. 36
Author(s):  
Popi Christoforidou ◽  
George Bariamis ◽  
Maria Iosifidou ◽  
Eri Nikolaidou ◽  
Petros Samaras
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Energy Savings ◽  
Wastewater Treatment Plants ◽  
Specific Energy Consumption ◽  
Water Environment ◽  
Organic Load ◽  
Technical Data ◽  
Environmentally Sustainable ◽  
Crucial Component

Wastewater treatment, as a crucial component of the urban water environment, consists of several energy-consumptive stages, therefore efficiency and energy savings measures are essential to maintain them as environmentally sustainable and economically viable. Operational and technical data from WWTPs in Greece have been collected as well as a sample from 61 facilities with key energy profile components. Energy consumption was assessed by specific key performance indicators (KPIs); specific energy consumption expressed per population equivalent (from 3 to 150 kWh/PE), per cubic meter treated (from 0.2 to 2.0 kWh/m3) and per unit of organic load removed (from 0.03 to 7.13 kWh/CODremoved).

Evaluating bioaccumulation of suspected endocrine disruptors into periphytons and benthos in the Tama River

2003 ◽  
Vol 47 (9) ◽  
pp. 71-76 ◽  
Author(s):  
A. Takahashi ◽  
T. Higashitani ◽  
Y. Yakou ◽  
M. Saitou ◽  
H. Tamamoto ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
River Water ◽  
Endocrine Disruptors ◽  
Wastewater Treatment Plants ◽  
Water Environment ◽  
The Other ◽  
Recombinant Yeast ◽  
Bioaccumulation Factors ◽  
17Β Estradiol ◽  
Aquatic Food

There are two major routes through which fish are exposed to endocrine disruptors (EDs); one route is through water that is a habitat; the other is through aquatic food such as algae and benthos. Few studies on the bioaccumulation of EDs in food have been conducted. Therefore, we evaluated the concentration in food of nonylphenol (NP), bisphenol A (BPA) and 17β-estradiol (E2), which were frequently detected in river water and in final discharge of Wastewater Treatment Plants (WWTPs) in Japan. We also evaluated the estrogenicity of samples using recombinant yeast. NP concentrations ranged 0.1-0.4 mg/L in the river water, while they ranged 8-130 mg/kg-wet in the periphytons and 8-140 μg/kg-wet in the benthos. BPA concentrations ranged 0.02-0.15 μg/L in the river water, while they ranged 2-8.8 μg/kg-wet in the periphytons and 0.3-12 μg/kg-wet in the benthos. E2 concentrations ranged 0.0001-0.0076 μg/L in the water, while they ranged 0.09-2.26 μg/kg-wet in the periphytons and <0.01-0.22 μg/kg-wet in the benthos. The estrogenicity ranged 0.0001-0.0464 μg-E2equivalent/L in the water, while it ranged 3.4-66.8 μg-E2equivalent/kg-wet in the periphytons and 7.4-5458 μg-E2equivalent/kg-wet in the benthos. Bioaccumulation factors of NP are estimated as 160-650 for the periphytons, and 63-990 for the benthos, respectively. Bioaccumulation factors of BPA are estimated as 18-650 for the periphytons, and 8-170 for the benthos, respectively. Bioaccumulation factors of E2 are estimated as 64-1,200 for the periphytons, and 100-160 for the benthos, respectively. The ratios of the periphytons and the benthos to the water in terms of the estrogenicity were larger than those in terms of the chemicals. In particularly, the ratio of the benthos to the water is about 106 in the maximum. The results suggest that food may be a more important route for fish exposed to EDs in water environment.

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