scholarly journals Modeling a Three-Stage Biological Trickling Filter Based on the A2O Process for Sewage Treatment

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1152
Author(s):  
Jiabin Liang ◽  
Yuan Yuan ◽  
Zimeng Zhang ◽  
Shijie You ◽  
Yixing Yuan
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Sewage Treatment ◽  
Simulation Software ◽  
Reflux Ratio ◽  
Software Modeling ◽  
Trickling Filter ◽  
Operational Parameters ◽  
Wastewater Treatment Process ◽  
Trickling Filters

Biological trickling filters are widely used for sewage treatment. This study models a biological trickling filter based on an anaerobic–anoxic–oxic process (A2O–BTF), established by a combination of aerobic and anaerobic technology. The performance and operational parameters were analyzed using Sumo, a commercially available wastewater treatment process (WWTP) simulation software. The wastewater treatment performance of the anaerobic–anoxic–oxic process biological trickling filter (A2O–BTF), the conventional three-stage biological trickling filter (Three-Stage–BTF), and the single-stage biological trickling filter (Single–BTF) was compared, which indicated the higher performance of A2O–BTF in terms of COD, TN, NH3-N, and TP removal. The operational parameters of A2O–BTF were optimized by Sumo simulation software, and the results showed that the removal efficiency of pollutants was increased by raising the temperature to the range of 13.94–21.60 °C. The dissolved oxygen (DO) in the aerobic reactor enhanced removal efficiency under a saturation concentration of 2.2–2.6 g O2/m3. In addition, the optimization of the reflux ratio promoted the removal efficiency of the pollutants, indicated by the maximum removal efficiency of COD and TN, achieved at the reflux ratio of 2.25, and that of NH3-N and TP, achieved at a reflux ratio of 0.75. This study provides a proof-in-concept demonstration that software modeling can be a useful tool for assisting the optimization of the design and operation of sewage treatment processes.

Технологические аспекты обезвоживания осадков промышленно-дождевых сточных вод автотранспортных предприятий

2019 ◽  
pp. 25-30
Author(s):  
G. Variushina
Keyword(s):  
Wastewater Treatment ◽  
Moisture Content ◽  
Vacuum Filter ◽  
Operational Parameters ◽  
Technological Parameters ◽  
Wastewater Treatment Process ◽  
Motor Transport ◽  
Cationic Flocculant ◽  
Residual Sludge ◽  
Treatment Facilities

Приводятся сведения об условиях формирования, объемах, химическом составе и свойствах осадков очистных сооружений производственных сточных вод автотранспортных предприятий. Даны примеры технологических решений по обезвоживанию образующихся в процессе очистки шламов. Рассмотрены технологические аспекты процесса интенсификации механического обезвоживания уплотненных осадков с использованием высокомолекулярных полиэлектролитов. Представлены данные лабораторных экспериментов по выбору типа флокулянта, его дозы, технологических параметров процесса, а также результаты определения влажности обезвоженных осадков, полученные на модели барабанного вакуум-фильтра. Приведены примеры эффективных обезвоживающих аппаратов отечественного производства и их технические характеристики, рекомендации и критерии их выбора, а также факторы, оказывающие влияние на эксплуатационные параметры обезвоживающего оборудования. Установлено, что наилучшая обезвоживающая способность барабанных вакуум-фильтров (остаточная влажность шламов от 66 до 83) может быть достигнута при применении катионного флокулянта ВПК-402 для осадков различных производственных цехов автотранспортного предприятия.Information on the conditions of generation, volumes, chemical composition and properties of sludge generated at the industrial wastewater treatment facilities of motor transport enterprises is provided. Examples of process engineering solutions for dewatering sludge generated during the wastewater treatment process are given. The technological aspects of enhancing mechanical dewatering of thickened sludge using high-molecular polyelectrolytes are considered. The data of laboratory experiments on choosing the type of flocculant, its dose, technological parameters of the process, as well as the results of determining the moisture content of dewatered sludge obtained in a model of a drum vacuum filter are presented. Examples of effective domestically produced dewatering apparatus and their technical characteristics, recommendations and criteria for their selection, as well as factors influencing the operational parameters of the dewatering equipment are given. It is found that the highest dewatering capacity of drum vacuum filters (residual sludge moisture content from 66 to 83) can be achieved by using VPK-402 cationic flocculant for processing sludge generated at the workshop premises of a motor transport enterprise.

scholarly journals Unravelling diversity and metabolic potential of microbial consortia at each stage of leather sewage treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41727-41737 ◽  
Author(s):  
Hebin Liang ◽  
Dongdong Ye ◽  
Lixin Luo
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Microbial Consortia ◽  
Biological Wastewater Treatment ◽  
Metabolic Potential ◽  
Ecological Functions ◽  
Wastewater Treatment Process ◽  
System P

Activated sludge is essential for the biological wastewater treatment process and the identification of active microbes enlarges awareness of their ecological functions in this system.

Denitrification in trickling filters

1994 ◽  
Vol 30 (6) ◽  
pp. 181-184 ◽  
Author(s):  
Bernd Dorias ◽  
Peter Baumann
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Capital Expenditure ◽  
Sewage Treatment ◽  
Innovative Technology ◽  
Activated Sludge Process ◽  
Trickling Filter ◽  
Sewage Treatment Plants ◽  
Trickling Filters ◽  
Test Operation

National and international regulations require a minimum nitrogen removal efficiency of 70% in most public sewage treatment plants. Unlike in activated sludge plants, selective denitrification in trickling filters was not possible until now. Therefore the aim was to employ trickling filter plants for selective denitrification, using innovative technology that involved minimum capital expenditure. For selective denitrification, it is necessary to prevent as much as possible the transfer of oxygen into the trickling filter while feeding the nitrate to be removed, a process similar to upstream denitrification in the activated sludge process. In a test operation conducted in several sewage treatment plants for over a year, the new process with selective denitrification in a covered trickling filter has given successful results. The denitrification efficiency of this system is comparable to that of upstream denitrification in the activated sludge process. Thus, selective denitrification in the trickling filter is a practical alternative to other nitrogen removal processes, while maintaining the established advantages offered by the trickling filter process.

Fully Biological Wastewater Treatment without Energy Consumption

1990 ◽  
Vol 22 (3-4) ◽  
pp. 331-334
Author(s):  
L. Csépai
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Longitudinal Section ◽  
Biological Wastewater Treatment ◽  
External Energy ◽  
Trickling Filters ◽  
Purification Efficiency ◽  
Maintenance Requirements

By two Sewage Treatment Plants it is demonstrated that a fully biological wastewater treatment without external energy supply is possible provided there is a sufficient natural gradient to guarantee a free flow through the entire plant. Both plants have now been in operation for more than 2 years. Test results show a very good purification efficiency. Elimination of BOD5 is over 93%, of COD 84%, of TOC 86%, of NH4 66 % and that of nitrogen totals 29%. The results of the two-year operation of both plants prove that also smaller units allow for meeting all requirements to obtain a good purification efficiency. Especially pre-settling and final clarifying ponds with interposed trickling filters represent a very simple but economic addition to the ample variety of modern wastewater techniques. It has also been demonstrated that, when planning wastewater treatment plants, every effort should be made to adjust the hydraulic longitudinal section to the existing area conditions, even at the risk of increased building costs. As far as economic considerations are concerned, a unit operating without energy consumption certainly proves advantageous. At the same time it offers a running guarantee, which is equally important, especially in case of smaller units. Particularly if local communities experience prolonged economic difficulties such considerations gain increasing priority. In addition to all these advantages the plants show a high buffering efficiency, minimum maintenance requirements and very low running costs.

The determination of nonylphenol and its precursors in a trickling filter wastewater treatment process

2013 ◽  
Vol 405 (10) ◽  
pp. 3243-3253 ◽  
Author(s):  
Bruce Petrie ◽  
Ewan J. McAdam ◽  
Mick J. Whelan ◽  
John N. Lester ◽  
Elise Cartmell
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Trickling Filter ◽  
Wastewater Treatment Process

Shell Powder for Strengthening Phosphate Removal Efficiency in Wastewater Treatment

2013 ◽  
Vol 781-784 ◽  
pp. 2138-2141
Author(s):  
Hong Jie Sun ◽  
Shao Hua Yang ◽  
Yu Bo Cui
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Natural Water ◽  
Irrigation Water ◽  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Phosphorus Concentration ◽  
Shell Powder

Phosphorus removal from wastewater has always been given serious attention in sewage treatment. Eutrophication can happen if phosphorus wastewater is directly discharged into natural water and high phosphorus-contained irrigation water may lead crops beat down. The research investigated the phosphorus removal efficiency in wastewater by shell powder. The experiment results showed that the best removal effect could meet the Wastewater Treatment Plant Discharge Standard (GB18918-2002) Grade I-A in China, which can be achieved under the conditions of the dosage of shell powder solution 1 ml, pH > 11 and precipitation one to four hours at the initial phosphorus concentration of about 3 mg/L.

Evolution of bacterial consortia in an integrated tannery wastewater treatment process

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87380-87388 ◽  
Author(s):  
Hebin Liang ◽  
Dongdong Ye ◽  
Pan Li ◽  
Tingting Su ◽  
Jiegen Wu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Bacterial Communities ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Physicochemical Characteristics ◽  
Tannery Wastewater ◽  
Illumina Hiseq ◽  
Wastewater Treatment Process ◽  
Bacterial Consortia

PCR-DGGE and Illumina HiSeq revealed the composition of bacterial communities in tannery sewage treatment and their linkages with the physicochemical characteristics of wastewater.

Treatment of Industrial Dimethylamine Wastewater in a Distillation Tower at Lab Scale

2013 ◽  
Vol 634-638 ◽  
pp. 326-329
Author(s):  
Qiu Lian Chang
Keyword(s):  
Wastewater Treatment ◽  
Pollution Control ◽  
Treatment Process ◽  
High Efficiency ◽  
Current Treatment ◽  
Reflux Ratio ◽  
Distillation Tower ◽  
Wastewater Treatment Process ◽  
New Type ◽  
Continuous Distillation

One of difficult pollution control tasks for leather plants is the dimethylamine wastewater treatment. It is identified that there are two serious problems occurring in the current treatment process: low removal efficiency and low recycle efficiency. To solve these problems, new-type high efficiency packing and wastewater treatment process are proposed. The rectifying conditions of dimethylamine wastewater were investigated in a laboratory continuous distillation tower. Dimethylamine distillation efficiencies of no less than 47% at the top of tower was obtained, when the bottom temperature was controlled between 105～106°C, reflux ratio between 2～3, Final concentrations of less than 50 mg•L-1 at the bottom was obtained.

scholarly journals Coupling Wastewater Treatment with Microalgae Biomass Production: Focusing on Biomass Generation and Treatment Efficiency

2020 ◽  
Vol 24 (6) ◽  
pp. 11-29
Author(s):  
Mohamad Padri ◽  
Nittaya Boontian ◽  
Chatlada Piasai ◽  
Thunchanok Phorndon
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Biomass Production ◽  
Defense Mechanisms ◽  
Oxygen Demand ◽  
Biomass Productivity ◽  
Treatment Efficiency ◽  
Wastewater Treatment Process ◽  
Algae Cultivation ◽  
Microalgae Biomass

Combination of suitable algae species with wastewater condition is important to achieve high productivity of algae with remarkable removal of contaminants. However, the usage of algae in treating wastewater has not yet to show sufficient removal efficiency when the biomass productivity is extremely enhanced. This review aims to scrutinize and discuss: (1) several promising species for this coupling method; (2) main wastewater characteristics related to the microalgae biomass production and their removal efficiency; (3) metal occurrences and other biotic factors; and (4) constraint of microalgae biomass production and wastewater treatment process. Microalgae such as Chlorella, Spirulina and Scenedesmus are among the most utilized microalgae because of their utilities. Chemical oxygen demand (COD) total nitrogen (TN), and total phosphorous (TP) concentrations affect biomass yield of algae cultivation. Metals occurrences, light intensity and carbon dioxide availability play an important role in process of algae cultivation with diverse optimum levels of each factor. Sufficient but not excess concentration of N and P solely for building biomass and other metabolism activities, mixotrophic condition for algae to digest organic carbon, and heavy metals defense mechanisms are expected to address constraint of biomass generation demand and wastewater treatment efficiency.

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