بررسی بهبود کیفی پساب درگذر از محیط‌های غیراشباع و اشباع در سیستم ذخیره-احیاء آبخوان (مقیاس آزمایشگاهی)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا گروه مهندسی آبیاری و آبادانی، دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران-کرج-ایران

2 استاد گروه مهندسی آبیاری و آبادانی دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران-کرج-ایران

3 استاد گروه مهندسی آبیاری و آبادانی دانشکده کشاورزی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران

چکیده

 
افت تراز سطح آب زیرزمینی در اکثر آبخوان‌های کشور باعث وقوع مسئله محیط‎زیستی شده است. در این مسیر رویکرد ذخیره-احیاء آبخوان‌ها با استفاده از پساب می‌تواند راهکار مناسبی برای احیاء سفره‌های آب زیرزمینی بحرانی باشد. در این راستا، در این پژوهش برهم‌کنش پساب، خاک و آب ‎آبخوان ازنظر کیفی، با عبور پساب از نواحی غیراشباع و ‎اشباع مورد ‎بررسی قرار گرفت. به این ‌منظور، مدل‎ آزمایشگاهی به شکل L، از جنس لوله‎PVC به قطر mm‎200‎ و طول ‎m 15(5/2 متر قائم برای ناحیه غیراشباع و 5/12 متر افقی برای ناحیه اشباع)، ساخته شد. سپس در 12 نقطه در طول مسیر جریان، برخی از آلاینده‎های موجود در پساب به مدت 60 روز اندازه‌گیری شدند. نتایج نشان داد غلظت نیترات پس از طی مسافت 7‎متر به کمتر ازmg/L‎5/0 رسید و آلاینده‌های میکروبی(کلی فرم و اشریشیاکلی) پس از 6 متر در نمونه  cc100 حذف ‌شده‌اند. ازنظر شوری، پساب باعث بهبود کیفیت ‌آب‌وخاک شد و هدایت الکتریکی آن از حدود 4 به 3/3 dS/m کاهش یافت. BOD و COD به ترتیب 81، 87 درصد کاهش داشتند. با توجه به بهبود کیفیت پساب درگذر از محیط‎های غیراشباع و اشباع، می‌توان سامانه ذخیره-احیاء را طوری اجرا کرد که پساب، ابتدا از محیط غیراشباع عبور کرده و سپس به آبخوان برسد.

کلیدواژه‌ها


عنوان مقاله [English]

Treated wastewater quality improvement through the unsaturated and saturated zones in an aquifer storage and recovery system (laboratory scale)

نویسندگان [English]

  • Morteza Moogooei 1
  • Majid Kholghi 2
  • Abdolhossein Hoorfar 2
  • Abdolmajid Liaghat 3
1 PhD Candidate, Department of Irrigation and Reclamation. Eng.Dept. -Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran
2 Irrigation and Reclamation Eng. Dept. -Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran
3 Irrigation and Reclamation Eng. Dept.-Faculty of Agriculture- Agricultural and Natural Resources Faculties-University of Tehran-Karaj-Iran
چکیده [English]

The groundwater level decline has caused an environmental issue in most of the Iranian aquifers. In this regard, aquifer storage and recovery (ASR) system can be used as a solution. On the other hand, the huge volume of treated wastewater in big cities can be used as a water source for aquifer storage purpose. In this study, the treated wastewater, soil and groundwater quality have been investigated through the unsaturated-saturated porous media. An experimental model, as L-shaped, has been designed using PVC pipe material with a diameter of 200 mm and a length of 15 m (2.5 m vertical and 12.5 m horizontal). The wastewater used in this research was obtained from the outlet of the sewage treatment plant in the south of Tehran. In order to avoid changes in the quality of wastewater during storage in the tank, it was tried to a regular change the treated wastewater in short intervals. After the initial investigations, a zone situated in center of in the Feshafuye plain, has been selected for treated wastewater injection. Then the required soil for laboratory setup has been collected for tis area. In this regard, firstly, the surface layer soil was removed, then the subsurface soil was transferred to the laboratory for the experimental setup. The required inflow water for this setup was taken from the aquifer of the same area and was changed regularly in order to establish the maximum real conditions. During this study, treated wastewater have been sampled and analyzed at 12 points along the flow path for 60 days. The results showed that the nitrate concentration decreased to less than 0.5 ppm after 7 m and microbial pollutants, total coliform and E. coli had been removed in a 100-cc sample after 6 m. In terms of salinity, the treated wastewater and soil quality have been improved from an EC of 4 to 3.3 dS/m. The BOD and COD have decreased by 81% and 87%, respectively. Due to improvement of treated wastewater quality through the unsaturated- saturated porous media, the ASR system can be implemented as a solution to prevent the groundwater level decline.

کلیدواژه‌ها [English]

  • wastewater
  • unsaturated
  • saturated
  • storage
  • laboratory

Treated wastewater quality improvement through the unsaturated and saturated zones in an aquifer storage and recovery system (laboratory scale)

EXTENDED ABSTRACT

 

Introduction

A large amount of treated wastewater is annually produced in greater cities of the world. On the other hand, groundwater overexploitation in most countries, especially in arid and semi-arid zones, causes a huge rate of groundwater drawdown and its quality. In such conditions, the aquifer recovery and storage (ASR) approach can be proposed. As it is done in most wastewater treatment plants, stage 2 is implemented, in this research, the ability of porous media to increase the quality of effluent in the ASR system is investigated. An experimental model in laboratory scale is designed and set up to evaluate the variation in the quality of the effluent in both its unsaturated and saturated zones, which according to our knowledge has not been addressed in previous studies.

Methods and Materials

The treated wastewater, soil and aquifer water of the region, which are used for the experimental model, have been collected and analyzed in the chemical laboratory. The designed experimental model has a vertical height of 2.5 meters and a horizontal length of 12.5 meters, respectively, to simulate the unsaturated and saturated zones, which was made with a PVC pipe with a diameter of 200 mm. In the mentioned model, a hole with a diameter of 6 cm was created at a distance of one meter from the vertical part and on the horizontal part, and a pipe of the same diameter and a height of 2.5 meters was placed inside it; in which the water level can be adjusted. For the treated wastewater and aquifer water injection site, a platform was considered at the top of the vertical part, and a 200-liter tank for wastewater and a 60-liter tank for water were installed on it. A float was used to create a fixed head at the top of the vertical part of the model, where the effluent enters.

Results and Discussion

The results show that after 60 days, the unsaturated-saturated zones showed a good effect to improve the treated wastewater quality. The BOD and COD of the treated wastewater shows a significant decrease, the BOD value has reached less than 2 mg/L in all periods, which is natural in ground water. The unsaturated zone performed well in removing these parameters. Microbial parameters such as Escherichia coli and Escherichia coli, after passing through the unsaturated zone, their value decreased drastically. The amount of salinity of the injected treated wastewater improves the quality of the soil in the unsaturated zone and improves the quality of the aquifer water in the saturated zone. After 60 days of injection, this process continued, and the more time causes more unsaturated quality improvement. The amount of salinity in the saturated zone has increased over time. But its amount is still lower than the salinity of the aquifer water along the way. After passing through the unsaturated zone, the nitrate concentration of the treated wastewater decreased to a great extent and also improved the water quality of the aquifer, so that after a distance of 7 meters from the beginning of the setup, its value was close to zero.

Conclusion

The groundwater level decline and a large volume of treated wastewater in the metropolises are two important issues in different countries of the world, especially in arid and semi-arid regions. In this regard, the aquifer-storage and recovery approach can be a good solution to manage these two problems. In this research, the ability of unsaturated and saturated porous media to increase the quality of wastewater injected into the aquifer has been investigated in a laboratory experimental model. According to the results, a significant increase in the quality of treated wastewater passing through unsaturated and saturated porous media, shows the high efficiency of this system. So, we propose to use our successful method in the ASR project.

Amin, H., Gad, A., El-Rawy, M., Abdelghany, U., & Sadeek, R. (2021). Assessment of wastewater contaminant concentration through the vadose zone in a soil aquifer treatment system. Applied Ecology and Environmetal Research, 19(3), 2385-2403.
Calderer, M., Martí, V., De Pablo, J., Guivernau, M., Prenafeta-Boldú, F. X., & Viñas, M. (2014). Effects of enhanced denitrification on hydrodynamics and microbial community structure in a soil column system. Chemosphere, 111, 112-119.
Coutinho, J. V., Almeida, C. d. N., Silva, E. B. d., Stefan, C., Athayde Júnior, G. B., Gadelha, C. L. M., & Walter, F. (2018). Managed aquifer recharge: study of undisturbed soil column tests on the infiltration and treatment capacity using effluent of wastewater stabilization pond. RBRH, 23.
Grinshpan, M., Furman, A., Dahlke, H. E., Raveh, E., & Weisbrod, N. (2021). From managed aquifer recharge to soil aquifer treatment on agricultural soils: Concepts and challenges. Agricultural Water Management, 255, 106991.
Garduño-Jiménez, A. L., Durán-Álvarez, J. C., Cortés-Lagunes, R. S., Barrett, D. A., & Gomes, R. L. (2022). Translating wastewater reuse for irrigation from OECD guideline: Tramadol sorption and desorption in soil-water matrices. Chemosphere, 135031.
Hamdan, N., Kavazanjian Jr, E., Rittmann, B. E., & Karatas, I. (2017). Carbonate mineral precipitation for soil improvement through microbial denitrification. Geomicrobiology journal34(2), 139-146.
Javani, H., Liaghat, A., Hassangholi, A. (2013). Assessing the rate of transfer of inorganic and biological contaminants present in the wastewater to the soil profile as a result of artificial recharge operations. Journal of Water and Soil (Agricultural Science and Technology), 27 (2), 422-431(In Persian).
Kholghi, M. Moogooei, M. Poozan, A. Bagheri, M (2017) Management of aquifer storage and recovery in Fashafouye plain from Robatkarim to Anisabad. Technical report, 152p (In Persian).
Li, R., Zhang, Y., & Guan, M. (2022). Investigation into pyrite autotrophic denitrification with different mineral properties. Water Research221, 118763.
Liang, X., Rengasamy, P., Smernik, R., & Mosley, L. M. (2021). Does the high potassium content in recycled winery wastewater used for irrigation pose risks to soil structural stability? Agricultural Water Management, 243, 106422.
Lin, W., Lin, W., Cheng, X., Chen, G., & Ersan, Y. C. (2021). Microbially induced desaturation and carbonate precipitation through denitrification: a review. Applied Sciences11(17), 7842.
Liu, C., Liu, F., Andersen, M. N., Wang, G., Wu, K., Zhao, Q., & Ye, Z. (2021). Domestic wastewater infiltration process in desert sandy soil and its irrigation prospect analysis. Ecotoxicology and Environmental Safety, 208, 111419.
Madrid, F., Lopez, R., & Cabrera, F. (2007). Metal accumulation in soil after application of municipal solid waste compost under intensive farming conditions. Agriculture, Ecosystems & Environment, 119(3), 249-256.
Morrison, C. M., Betancourt, W. Q., Quintanar, D. R., Lopez, G. U., Pepper, I. L., & Gerba, C. P. (2020). Potential indicators of virus transport and removal during soil aquifer treatment of treated wastewater effluent. Water research, 177, 115812.
Mazaheri, F., & Mozaffari, J. (2019). Experimental study of wastewater artificial recharge and its effect on nitrate concentrations. Journal of Water Process Engineering31, 100862.
Nandha, M., Holden, B., Jefferson, B., Jeffrey, P., & Le Corre, K. (2013). The Relationship between Source and Recovered Water Quality during Storage in a Sherwood Sandstone Aquifer.
Nguyen, H. T., Kim, Y., Choi, J. W., Cho, K., & Jeong, S. (2020). Assimilable organic carbon removal strategy for aquifer storage and recovery applications. Environmental Research, 191, 110033.
Ollivier, P., Surdyk, N., Azaroual, M., Besnard, K., Casanova, J., & Rampnoux, N. (2013). Linking water quality changes to geochemical processes occurring in a reactive soil column during treated wastewater infiltration using a large-scale pilot experiment: Insights into Mn behavior. Chemical Geology, 356, 109-125.
Olsthoorn, T. N. (1982). Clogging of recharge wells: main subjects. In KIWA-communications (Vol. 72): KIWA.
Page, D., Vanderzalm, J., Barry, K., Torkzaban, S., Gonzalez, D., & Dillon, P. (2015). E. coli and turbidity attenuation during urban stormwater recycling via aquifer storage and recovery in a brackish limestone aquifer. Ecological Engineering, 84, 427-434.
Paredez, J. M., Mladenov, N., Galkaduwa, M. B., Hettiarachchi, G. M., Kluitenberg, G. J., & Hutchinson, S. L. (2017). A soil column study to evaluate treatment of trace elements from saline industrial wastewater. Water Science and Technology, 76(10), 2698-2709.
Pavelic, P., Nicholson, B. C., Dillon, P. J., & Barry, K. E. (2005). Fate of disinfection by-products in groundwater during aquifer storage and recovery with reclaimed water. Journal of contaminant hydrology, 77(4), 351-373.
Rekha, K., & Lokeshappa, B. (2020). Comparative studies on removal of heavy metals from electroplating wastewater through soil aquifer treatment (SAT) in conjunction with adsorbents. Water Science and Technology, 82(10), 2148-2158.
Smith, C., Hopmans, P., & Cook, F. (1996). Accumulation of Cr, Pb, Cu, Ni, Zn and Cd in soil following irrigation with treated urban effluent in Australia. Environmental Pollution, 94(3), 317-323.
Tanmoy, D. S., Bezares-Cruz, J. C., & LeFevre, G. H. (2022). The use of recycled materials in a biofilter to polish anammox wastewater treatment plant effluent. Chemosphere296, 134058.
Xu, J., Wu, L., Chang, A. C., & Zhang, Y. (2010). Impact of long-term reclaimed wastewater irrigation on agricultural soils: a preliminary assessment. Journal of hazardous materials, 183(1), 780-786.