- QUALITY OF MUNICIPAL WASTEWATER FOR MICRO IRRIGATION

2014 ◽  
pp. 134-147
Keyword(s):  
Municipal Wastewater ◽  
Micro Irrigation

Continuing the Development of Municipal Effluent Guidelines for the Northwest Territories

1986 ◽  
Vol 18 (2) ◽  
pp. 179-184
Author(s):  
R. J. Kent
Keyword(s):  
Northwest Territories ◽  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Coliform Bacteria ◽  
Flow Ratio ◽  
Dilution Ratio ◽  
Effluent Quality ◽  
Municipal Effluent

The background to and the rationale for the Guidelines for Municipal Type Wastewater Discharges in the Northwest Territories is discussed. Particu1ar attention is given to the development of Table 2.1, Effluent Quality of Municipal Wastewater Discharges, which was based upon expected lagoon performance. Also included is a discussion of the flow ratio and dilution ratio concepts. The viability of these concepts was assessed against the available data. It appears that the guidelines misjudged both the number of coliform bacteria in northern raw sewage and the removal efficiency for these organisms in lagoons. It appears unlikely that lagoons can consistently meet the guideline requirements. More information and research is necessary before a complete assessment can be performed.

scholarly journals Methods of reconstruction and modification of the sequencing batch reactor at municipal wastewater treatment plants in Vietnam

Vestnik MGSU ◽  
2019 ◽  
pp. 589-602 ◽  
Author(s):  
Tran Ha Quan ◽  
Elena S. Gogina
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Municipal Wastewater Treatment ◽  
Wastewater Purification ◽  
Municipal Wastewater Treatment Plants ◽  
Operation Cycle

Introduction. Vietnamese urban municipal wastewater treatment plants are mainly of aeration-type facilities. Nowadays, an aeration-type plant, the Sequencing Batch Reactor (SBR), is widely applied and possesses a number of advantages over traditional systems with suspended activated sludge. Advantages of the SBR are mainly concluded in simplicity of operation, occupied area and cost. There is a number of problems at the wastewater treatment plants; they are connected with supplying only a half of wastewater design amount for the treatment as well as with quality of the purified water that must satisfy requirements of the Vietnamese discharge standard, the Standard A. Therefore, reconstruction and modification of the SBR is the major challenger to ensure the sustained development of large Vietnamese cities and maintenance of ecological balance. Materials and methods. To enhance the efficiency of wastewater purification in the SBR, the experiments were set on reactor reconstruction and modification by two directions: (1) Technological method, i.e. applying the Biochip 25 biocarrier, and (2) Operation method, i.e. adding the anoxic phase in reactor operation cycle. Laboratory tests were conducted for each of the directions, including comparison of a typical reactor with the modified one. Results. The study resulted in obtaining an optimal amount of the BioChip biocarrier material (10 to 20 %) that increased efficiency of wastewater purification by 10 to 20 %. In addition to this, when creating an anoxic phase of the operation cycle, efficiency of nitrogen removal increased by 20 %. When the denitrification occurs under the anoxic conditions, it contributes to stabilization of ammonium nitrogen removal for daily nitrogen loading in reactor of 0.3 to 0.8 TKN kg/sludge kg. Conclusions. The suggested technology provides the quality of treated water corresponding with the Vietnamese Standard A requirements. At the present, it is planned to proceed with the experiment on the base of Vietnamese semi-industrial plant for research and appraisal of the SBR reconstruction and modification method. Acknowledgements. The authors are grateful to AKVA Control company in Samara for granted biocarrier Mutag BioChip 25 and to Associate Professor Tran Van Quang and his students, Nguyen Ngoc Phuong and Truong Quoc Dai, of Environment Protect Research Center, Danang University for support of the experiment.

scholarly journals Reuse of Treated Municipal Wastewater from Constructed Wetlands for Cut Flowers Irrigation in Aeroponic Cultivation

2020 ◽  
Vol 24 ◽  
Author(s):  
Ismael Leonardo Vera-Puerto ◽  
Jorge Leonardo Olave-Vera ◽  
Sussy Tapia ◽  
Wladimir Antonio Chávez ◽  
Carlos Arias
Keyword(s):  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Cut Flower ◽  
Cut Flowers ◽  
Cultivation System ◽  
Cultivation Systems ◽  
Arid Conditions ◽  
Affected Plant ◽  
Treated Municipal Wastewater

The aim of this work is to evaluate the reuse of municipal wastewaters treated through subsurface constructed wetlands (SS-CWs) as irrigation water in cut flower aeroponic cultivation under arid conditions. For this purpose, two experimental aeroponic cultivation systems were installed with the cut flower Lilium ‘Tresor’ planted and irrigated with SS-CWs treated water. The results showed that the quality of the SS-CWs wastewater has to be improved to be used in irrigation. Despite that, Lilium ‘Tresor’ grew under arid conditions with normal stem diameters and number of flowers but with heights under 0.65 m, which would restrict their commercialization to local markets. Water electrical conductivity (> 2300 µs/cm) and luminosity (> 120 klux) were factors that affected plant height. When compared to other cultivation systems, the aeroponic cultivation system used between 10 % and 20 % of the amount of water needed to produce Lilium ‘Tresor.’ Thus, this work showed the feasibility to produce cut flowers using an aeroponic cultivation system under arid conditions and irrigated with SS-CWs effluents. Likewise, it was detected that improvements to water quality and luminosity must be made for industrial scaling.

scholarly journals The Influence of the Poles’ Lifestyle on the Quantity and Quality of Municipal Wastewater

2021 ◽  
Vol 31 (3) ◽  
pp. 265-275
Author(s):  
Ewelina Płuciennik-Koropczuk ◽  
Martyna Myszograj ◽  
Sylwia Myszograj
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Organic Compounds ◽  
Municipal Wastewater ◽  
Personal Care ◽  
Total N ◽  
Qualitative Characteristics ◽  
Total P ◽  
Wastewater Treatment Systems

Abstract The article presents lifestyle as an important factor determining the quantity and quality of municipal wastewater. The characteristic of wastewater in Poland has changed significantly in recent years. The qualitative characteristics of municipal wastewater indicate an increase of organic compounds and in the scope of micro-contaminants identified in them, e.g. nanoparticles, microplastics, pharmaceutical and personal care products or heavy metals. Therefore, the knowledge of parameters such as: BOD5, COD, total N, total P and suspension solids is no longer sufficient for the design and operation of wastewater treatment systems. Comprehensive research in this area is necessary to select those indicators that better describe the characteristics of wastewater.

Extending Tertiary Treated Municipal Wastewater as Boiler Feed-Water via a Dual Membrane CUF/RO Process

2013 ◽  
Vol 726-731 ◽  
pp. 2476-2482
Author(s):  
Hai Xia Wang ◽  
Peng Ji
Keyword(s):  
Municipal Wastewater ◽  
Exchange Process ◽  
Feasibility Studies ◽  
Cost Comparison ◽  
Feed Water ◽  
Water Recovery ◽  
Ion Exchange Process ◽  
Ro Membrane ◽  
Treated Municipal Wastewater

The objective of this work is to conduct feasibility studies on water treatment for boiler feeding water use from treated municipal wastewater effluent using a pilot dual continuous ultrafiltration - reverse osmosis (CUF/RO) membrane process with the capacity of 15m3/h. A CUF membrane from HYDRAcap and LFC3-LD RO membrane were used in this study. The CUF unit and RO unit were operated at over 97% and 75-80% water recovery, respectively. The results indicate that CUF process is not only capable of reducing organic and nutrient pollutants but also achieves a silt density index (SDI) less than 2, turbidity of less than 0.47NTU which is suitable for RO treatment. Rejection of the RO unit in terms of average conductivity, COD, hardness, alkaline, NH4+-N, TN, TP were higher than 98.2%, 97.9%, 99.8%, 97.9%, 93.9%, 95.1% and 75%, respectively. Other parameters also can match the quality of high-grade water for use in the boiler industry except pH. Finally, a cost comparison between dual membrane and ion-exchange process showed annual savings of more than 33000000 CNY can be possible.

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