Complex asset protection assessment of wastewater treatment plants 21-23
0
Citation
0
Reference
10
Related Paper
Abstract:
Aim: Wastewater is generated in the daily activities of population. In order to ensure the continuous treatment of wastewater, we maintain wastewater network system and operate wastewater treatment plants. The position and condition of wastewater treatment plants plays an important role in maintaining the safety of society, since untreated wastewater may cause significant health and environmental problems if it is released untreated into the environment. The aim of this article is to examine the complex protection situation of wastewater treatment plants.Methodology: This article is based on literature, on-site observation and analysis of images available on Google Maps.Findings: Without the complex protection of the wastewater treatment plants, the continuous provision of wastewater treatment cannot be maintained.Value: The article focuses on the situation of the fences as one element of the outdoor protection, which is part of the complex protection system of wastewater treatment plants.A municipal wastewater treatment plant plays an important role in treating urban sewage and reducing the quantity of pollutants discharged into rivers. However, the energy consumption of the municipal wastewater treatment industry is large. High energy consumption indirectly produces ecological damage, accelerates the energy crisis, and increases carbon emissions. For energy conservation and emission reduction in wastewater treatment plants, it is first necessary to identify the main factors influencing energy consumption. Electricity consumption accounts for more than 80% of the energy consumption of wastewater treatment plants. Wastewater quantity and wastewater quality have become the key influencing factors of energy conservation and consumption reduction in wastewater treatment plants. In this study, a municipal wastewater treatment plant in Northeast China was selected as the research object, and the measured data, such as air temperature, wastewater quantity, wastewater quality, and electricity consumption of the plant from 2017 to 2020 were statistically analyzed to explore the influences of temperature and wastewater quantity and wastewater quality indicators of influent and effluent on energy consumption. Firstly, the range of influent quantity in the wastewater treatment plant was large. The influent quantity in summer was high because some rainwater entered the sewage treatment plant. In winter, average daily electricity consumption (ADEC) was higher than that in summer. The relationship between ADEC and the wastewater quantity showed a positive correlation, and ADEC slowly increased with the increase in wastewater quantity. Electricity consumption per unit of wastewater (UEC) was negatively correlated with the wastewater quantity, but the correction coefficient in winter was larger than that in summer. Secondly, the ranges of chemical oxygen demand (CODCr) and ammonia nitrogen in influent were large, and the ranges of CODCr and ammonia nitrogen in effluent were small. Influent CODCr concentration was negatively correlated with influent ammonia nitrogen concentration. ADEC increased slightly with the increase in influent CODCr concentration. In winter, the increasing trend of ADEC with the influent CODCr concentration was higher than that in the summer. The increasing trend of UEC with the increase in influent COD concentration in summer was more significant than that in winter. Thirdly, influent CODCr in 11.6% of the samples exceeded the corresponding designed value, and influent ammonia nitrogen concentration in 41.4% of the samples exceeded the corresponding designed value. Effluent CODCr in 10.6% of the samples exceeded the First Level Class B standard in "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB18918-2002)", and unqualified CODCr in 94% of the effluent samples was ascribed to the unqualified ammonia nitrogen concentration in the influent samples. The electricity consumption level under abnormal conditions was higher than that under normal conditions. Fourthly, ADEC was positively correlated with the average daily CODCr reduction. The correction coefficient of ADEC with average daily CODCr reduction was greater in winter than that in summer. Fifthly, the average electricity consumption per unit of wastewater was close to the national average energy consumption, displaying the characteristics of high energy consumption in winter and low energy consumption in summer. The correlation analysis results of unit electricity consumption and temperature showed that when it was below 0 °C, the lower the temperature, the higher the electricity consumption. In Northeast China, the influences of seasons and temperatures on the electricity consumption of sewage plants were obvious. Accordingly, it is necessary to implement the diversion of rainwater and sewage, reduce the discharge of unqualified wastewater from enterprises, and take thermal insulation measures in winter. In addition, activated sludge microorganisms suitable for a low temperature area and the optimal scheduling of sewage pipe networks can also improve the operation and management of sewage treatment plants.
Cite
Citations (8)
Research and experiment are conducted on the technologies used in biochemical wastewater treatment to alleviate the influence of oilfield sewage on the environment,fully use waste water,and reduce the use of fresh water.Other systematic processes and technologies are combined to be used in wastewater treatment,which helps to realize the wastewater reinjection in low-permeability oilfields and enables the oilfield wastewater to meet the discharge standard.In view of the problem that the wastewater reinjection in low-permeability does not easily meet the standard,the fine wastewater treatment process,based on biochemical treatment and fine filtration,is experimentally applied to Block Fan41 of Daluhu Oilfield.The wastewater disposed reaches Grade A1 of the standards.To solve the treatment difficulty of polymer-contained wastewater,the biochemical treatment technology is used to reduce the chemical oxygen consumption of wastewater.As a result,the wastewater disposed reaches the environmental protection standard.Lab research and field experiment results show that oilfield wastewater can be treated with biochemical methods as long as favorable microbes are selected and applied.
Filtration (mathematics)
Cite
Citations (0)
The number of microbreweries in Sweden has grown a lot since 2009, from about 30 to 240 breweries. In the production of beer, wastewater is also produced which must be taken care of to avoid inconvenience to people and the environment. How the wastewater should be treated has been a problem for a couple of breweries. This study is based on a case study, Remmarlov Gardsbryggeri, that needs a new wastewater treatment. Within the case study characteristics in the wastewater was identified by sampling and analysis in the laboratory. The most noticeable results of the sampling of the wastewater were high levels of COD and BOD, high levels of phosphorus in comparison with the levels of nitrogen, and a low pH in the wastewater. To find out what kind of wastewater treatment methods to use at Remmarlov Gardsbryggeri, a survey was made to identify wastewater treatment methods used in Swedish microbreweries. The survey was targeted against major micro breweries in Sweden. The major micro breweries in Sweden was 56 in total, of which 20 of them answered the survey. The survey showed that most of the breweries used municipal wastewater treatment with some pre-treatment in the form of a collection tank, to give more even wastewater, and pH adjustment. Other breweries spread their wastewater on farmland, used an infiltration plant or had an internal wastewater treatment plant. In order to evaluate which wastewater treatment method suited Remmarlov Gardsbryggeri, a matrix was made on the treatment methods identified in the survey. Municipal wastewater treatment has the best degree of purification and control after the treatment but would mean a huge cost for Remmarlov Gardsbryggeri. Using infiltration by sludgy would mean a good degree of purification together with a pre-treatment to lower the level of phosphorus, is easy to control and would therefore be a suitable treatment for Remmarlov Gardsbryggeri. An alternative is spreading the wastewater on farmland or Salix which also have showed good degree of purification and could be controlled due to the farmlands drainage system which ends up in a ditch. (Less)
Cite
Citations (0)
Biosolids
Cite
Citations (4)
Aim: Wastewater is generated in the daily activities of population. In order to ensure the continuous treatment of wastewater, we maintain wastewater network system and operate wastewater treatment plants. The position and condition of wastewater treatment plants plays an important role in maintaining the safety of society, since untreated wastewater may cause significant health and environmental problems if it is released untreated into the environment. The aim of this article is to examine the complex protection situation of wastewater treatment plants.Methodology: This article is based on literature, on-site observation and analysis of images available on Google Maps.Findings: Without the complex protection of the wastewater treatment plants, the continuous provision of wastewater treatment cannot be maintained.Value: The article focuses on the situation of the fences as one element of the outdoor protection, which is part of the complex protection system of wastewater treatment plants.
Cite
Citations (0)
The purpose of this work was to determine the optimal percentage of wastewater from cesspool in the mixture of wastes subjected to treatment processes, which will not have a negative impact on the functioning of the collective treatment plant. The study was carried out over a period of two years, with 48 samples of wastewater flowing in from the sewage network and delivered with the slurry tanker collected and subjected to physical and chemical analysis. The analysis included: Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), and Total Nitrogen (TN). In addition, the study defined the daily balance of the amount of inflowing and transported wastewater. Based on the analysis carried out, it was found that the unit loads of BOD5, COD and TN in the mixture of wastewater subjected to the treatment process will be at the level of loads assumed in the project, when the share of supplied wastewater, i.e., from cesspool, will be at the level of 5% of the total amount of wastewater. Considering that in the analysed period the total average daily amount of wastewater subjected to the treatment process was 253.5 m3·d−1, the optimal amount of wastewater delivered should be 12.7 m3 in each day of the week.
Biochemical oxygen demand
Cite
Citations (3)
Wastewater must be treated in order to reduce the environmental impact of used water and to ensure the efficient use of its resources. Physical, chemical, and biological treatment techniques are used to treat domestic wastewater. It's crucial to either optimize existing processes for domestic wastewater, which has different characteristics in terms of wastewater characterization, or use appropriate treatment technologies, taking into account the conditions in the region where the plant will be built. In this study, the wastewater treatment plant for the Hakkari city centre, where there is no wastewater treatment plant and wastewater is discharged without treatment, was designed and modeled using the GPS-X simulation program.
Cite
Citations (0)
Cite
Citations (18)
PER: and polyfluoroalkyl substances (PFAS) are ubiquitously distributed in wastewater, due to their numerous uses in industry and consumer products, but little is known of PFAS mass flows in municipal wastewater network systems and within wastewater treatment plants (WWTPs). This study assessed mass flows of 26 PFAS in a wastewater network and WWTP, to provide new insights into their sources, transport, and fate in different treatment steps. Wastewater and sludge samples were collected from pumping stations and the main WWTP in Uppsala, Sweden. PFAS composition profiles and mass flows were used to identify sources within the sewage network. Wastewater from one pumping station showed elevated concentrations of C3-C8 PFCA, likely caused by an industrial source, and two stations had elevated concentrations of 6:2 FTSA, probably originating from a nearby firefighter training facility. Within the WWTP, short-chain PFAS dominated in wastewater, whereas long-chain PFAS dominated in sludge. The ratio of perfluoroalkyl sulfonates (PFSA) and ethylperfluorooctanesulfonamidoacetic acid (EtFOSAA) to ∑26PFAS decreased during the WWTP process, likely due to sorption to sludge, but also transformation (EtFOSAA). Overall, PFAS were not efficiently removed in the WWTP, with mean removal efficiency of 10 ± 68% for individual PFAS, resulting in discharge of 7000 mg d-1 ∑26PFAS into the recipient. This shows that conventional WWTPs are inefficient in removing PFAS from wastewater and sludge, so advanced treatment techniques are needed.
Sewage sludge
Industrial wastewater treatment
Cite
Citations (25)
An efficient wastewater treatment is one of the key points in the environmental protection both due to growing amounts of wastewater and associated biological risks. Wastewater treatment is a complex and time-consuming process; however, despite a significant number of studies in this area, the problem of maximizing wastewater treatment has not been fully resolved yet.
For the best wastewater treatment, researchers often experiment with the combined use of different treatment methods, but a highly efficient treatment of petroleum-containing wastewater is still an urgent task.
One of the most efficient and safe ways to treat wastewater is phytoremediation involving the use of green plants to absorb various pollutants. Oxidation using hydroxyl radicals, which are involved in the natural processes of water self-purification, is a promising solution for treatment of wastewater with a high content of organic compounds, including petroleum-containing effluents.
Wastewater treatment is a complex and time-consuming process; however, despite a significant number of studies in this area, the problem of maximizing wastewater treatment
In this paper, we suggest a two-stage technology for treatment of wastewater with a high content of organic compounds using green plants and oxidation process. For the first stage, we have analyzed the phytoremediation method and selected the most effective plants in the treatment of wastewater under consideration. For the second stage, we have analyzed the Fenton's process, based on which we have selected the optimal ratio and concentration of oxidizer and catalyst. We have assessed the wastewater treatment efficiency using the suggested two-stage treatment technology in terms of the chemical oxygen demand (COD), which was 83.9 %.
Cite
Citations (0)