<4D6963726F736F667420576F7264202D20D2E5D1C7C120E3D8D120E6CF20C7D3D1C7C120E6D3CAED20E6E4E6D132362D203336> This is an open access article under the CC BY license : Al-Khwarizmi Engineering Journal Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, September, (2022) P. P. 26- 36 Assessment of Ornamental Plants Tolerance for Acute Exposure of Acetaminophen and Methylparaben in Constructed Wetlands- a Preliminary Study Zahraa Hasan Mutar* Ahmed A. Mohammed** Israa Abdulwahab Al-Baldawi*** Siti Rozaimah Sheikh Abdullah**** Nur ’Izzati Ismail***** **Department of Architecture Engineering/ College of Engineering/ University of Wasit/ Iraq **Department of Environmental Engineering/ College of Engineering/University of Baghdad/ Iraq ***Department of Biochemical Engineering/ Al-khwarizmi College of Engineering/ University of Baghdad / Iraq ****,*****Department of Chemical and Process, Faculty of Engineering and Built Environment/ Universiti Kebangsaan Malaysia/ Malaysia *Email: zhassan@uowasit.edu.iq **Email: ahmed.abedm@yahoo.com ***Email: israa@kecbu.uobaghdad.edu.iq ****Email: rozaimah@ukm.edu.my *****Email: nurezatyismail@ukm.edu.my )Received 28 March 2022; Accepted 14 August 2022 ( https://doi.org/10.22153/kej.2022.08.002 Abstract The study aims to select suitable ornamental plant species that can survive relatively with high concentrations of acetaminophen and methylparaben in constructed wetlands. Alternanthera spp, Asparagus aethiopicus and Chlorophytum comosum are examined to withstand three initial concentrations, 20, 100 and 200 mg/L of acetaminophen and methylparaben. A total of 21 plastic pails with each 3 L capacity consisting of nine pails are used for each pharmaceutical and personal care products (PPCPs) compounds (acetaminophen and methylparaben) for three ornamental plants (Alternanthera spp, Asparagus aethiopicus and Chlorophytum comosum), with three pails as plant controls. The results reveales that both Alternanthera spp and Chlorophytum comosum exhibite a good tolerance for acetaminophen with a reduction in the total chlorophyll content of about 4.4–12.3% and 3.9–31.9% for Alternanthera spp and Chlorophytum comosum, respectively. Moreover, it is evident that high concentrations (100 and 200 mg/L) of methylparaben adversely affects the chlorophyll content of the three involved plant species. These results indicate that ornamental plants play an important role in the phytoremediation of PPCPs and can be considered as an esthetic treatment for hospital wastewater. Keywords: Ornamental plant, Phytoremediation, chlorophyll, pharmaceuticals, and personal care products. 1. Introduction The excessive and unconscious consumption of pharmaceuticals and personal care products (PPCPs) have introduced enormous quantities of contaminants into the ecological system, as more than 50% of commercial chemicals can cause harmful effects to the environment due to unregulated disposal [1]. PPCPs can cause serious effects on the aquatic environment, being predominantly toxic and endocrine disruptors. Nonetheless, long-term exposure to sublethal concentrations of PPCPs may cause genetic mutations of environmental microorganisms, Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 27 especially pathogenic microorganisms [2]. PPCPs are often continuously released into aquatic environments and thus have been frequently detected in water sources in the range of ng/L to mg/L [3]. Some PPCPs are partially removed in conventional wastewater treatment processes such as coagulation, sedimentation, filtration, and biological treatment; thus, alternative treatment technologies are required [4] for complete removal. Phytoremediation employs plants to eliminate contaminants from the environment [5]. In phytoremediation, plants assisted by microorganisms play a vital role in degrading, converting, metabolizing or detoxifying various pollutants from soil, water and air. Furthermore, this technology has many benefits and aesthetical values compared with conventional treatment technologies [6]. This technology has attracted great attention due to its numerous advantages, including sustainability, low costs, ease of operation, and application in large areas [7]. Constructed wetlands (CWs) are engineered systems that mimic the physical, chemical, and microbiological processes prevailing in natural wetlands to eliminate various contaminants [8]. CWs are employed to reduce pollutants (nutrients, organic and inorganic waste) in wastewater before discharge into water bodies; further, it represents an alternative to costly conventional sewage treatment techniques [9]. Plant characteristics, including the root system and enzymes, have a significant role in CWs [6]. To select a suitable plant species for phytoremediation of PPCPs, several considerations must be considered, including the climatic conditions and the characteristics of the wastewater. Furthermore, the adaptability of the plant to the saturation conditions, the growth potential of roots, and the tolerance to high pollutant concentrations should also be considered [10]. The use of native plants is often preferred due to their high potential for adaptation on the surrounding environmental condition [11]. Kurniawan et al. [9] pointed out several plants' high potential, including Chloris virgata, Rotala rotundifolia, Ludwigia adscendens, and Trapa natans Phragmites australis, Pistia stratiotes, Azolla pinnata, and Lemna minor, in reducing nutrient from organic-rich wastewater in CWs. According to Abdullah et al. [6], terrestrial plants are the most employed in phytoremediation (62%), followed by aquatic plants (33%), whereas ornamental plant is the least used (5%). Macci et al. [12] chose a set of ornamental plants (Canna indica, Carex hirta, Miscanthus sinensis, and Zantedeschia aethiopica) to be tested in CWs. The researchers justified the reasons for this choice due to the aesthetic value of these plants and being noninvasive. Guittonny-Philippe et al. [13] believed that resistant and reproductive macrophyte species, including Typha spp. or Phragmites australis in CWs might cause displacement of native plants or disrupt the natural cycles of plant replacement [13]. Therefore, the researchers insisted on providing consensual solutions that would achieve the objectives of treatment in CWs while ensuring natural biological diversity. Chlorophyll is the pigments that mainly exist in chloroplasts and drive photosynthesis by converting the absorbed light into chemical energy. Chlorophyll levels may decrease because of plant exposure to various forms of stress such as pollutants, drought, and other environmental factors [14]. This study is conducted to assess the stress of acetaminophen (AC) and methylparaben (MP) on three different types of ornamental plants and compare their responses. Photosynthetic pigments (chlorophyll a, chlorophyll b, and total chlorophyll content) are monitored to detect the physical changes that appear on the plants. 2. Materials and Methods 2.1Chemicals and plant material This study was conducted outdoor at the University of Baghdad (25-35 °C). Two PPCPs were involved in this experiment, namely acetaminophen (Middle East Laboratories Co. Ltd, Iraq) and methylparaben (VWR Chemicals, UK). The properties of the relevant PPCPs are summarized in Table 1 [15]. Stock solutions of each acetaminophen and methylparaben at 500 mg/L were prepared in methanol and stored before use. Three types of ornamental plants (Alternanthera spp, Asparagus aethiopicus and Chlorophytum comosum) were purchased from Al- Zawraa Park, Baghdad, Iraq. Plants were selected due to their availability and suitability to the warm climate of Iraq. Plants were first acclimated to tap water for one week, and then homogenous plants were chosen for the experiments. Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 28 Table 1, Properties of AC and MP Characteristics Acetaminophen (AC) Methyl Paraben (MP) Molecular Formula C8H9NO2 C8H8O3 Molecular weight (g/mole) 151.16 g/mol 152.15 g/mol Water Solubility (mg/L) 14000 mg/L 25000 mg/L Octanol-Water partitioning coefficient (Log KOW) 0.46 1.96 2.2. Experimental setup A total of 21 plastic pails with 3 L capacity each were used, which were divided into three groups as shown in Figure 1. The two groups (18 pails) were exposed to 20, 100 and 200 mg/L concentrations of acetaminophen and methylparaben in the three selected plants. In contrast, the third group (3 pails) was filled with tap water only as plant controls. Synthetic wastewater was prepared at three concentrations (20, 100 and 200 mg/L) of acetaminophen and methylparaben, individually, then was fed at a volume of 1 L in batch mode into pails. The pails were planted with the relevant plant species (one plant which is homogeneous in weight with the other plants) in 2 kg of fine gravel (2–5 mm ɸ). High PPCPs concentrations were used in this study to simulate a hypothetical case of acute exposure. The concentration ranges were established based on the previous literatures [13, 14, 16, 17] that pointed out the low ranges of PPCPs concentrations observed in industrial effluents and water sources. Fig. 1. Experimental setup for acute tolerance test. 2.3 Chlorophyll content determination The experiment was extended for two weeks. The chlorophyll content of all plants was determined at the end of the experiment (day 14) and compared with the initial values (day 0). Visual observation was also adopted to monitor the changes that occur in the growth of plants during the experiment period to determine their tolerance for the high concentrations of pollutants and survival. Chlorophyll content was conducted in two replicates for each plant. It was determined spectrophotometrically according to Liu et al. [18] at intervals of 0 and 14 days after the first application of acetaminophen and methylparaben. Briefly, 0.2 g of fresh plant samples (particularly, from leaves) were homogenized in 20 mL of 80% acetone with about 0.2 g of quartz sand and calcium carbonate until the samples turned white. Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 29 The homogenate left for 3–5 min was then centrifuged and filtered into a brown volumetric flask of 25 mL-metered volume [18]. The absorbance of the supernatants was measured at 663 and 645 nm via SpectroScan (80D, USA). Chlorophyll a (Chl a), chlorophyll b (Chl b), and total chlorophyll content were calculated according to the following equations [18]: ( ) ( ) ( )663 645 12.21 2.81× − × =mg g A A Chlorophylla FW … (1) ( ) ( ) ( )645 663 20.13 5.03× − × =mg g A A Chlorophyllb FW … (2) ( ) = +mg gTotalchlorophyll chlorophylla chlorophyllb … (3) with A663 and A645 are absorbance at 663 nm and 645 nm for chlorophyll a and b, respectively, and FW is the fresh weight (g) of the plant sample. 2.4 Statistical analysis All statistical analysis were performed using SPSS Version 21 (IBM, USA). The univariate analysis of variance (ANOVA) was performed at a confidence level of 95% (p<0.05) to specify the influence of the independent variables on the total chlorophyll content in plants. 3. Results and Discussions 3.1 Plant visual observation The tolerance of three types of ornamental plants to relatively high concentrations of acetaminophen and methylparaben was tested for 14 days in order to determine the most suitable plant to be subsequently employed in CWs. Through visual observation, Alternanthera spp showed a superior tolerance to stress induced by both water and acetaminophen; as no signs of wilting were observed on plants in control systems and those that were exposed to acetaminophen involved concentrations (Table 2 and 3) during the experiment. On the other hand, the wilting and yellowing were observed on Alternanthera spp that were exposed to MP (Table 4), particularly at high concentrations (100 and 200 mg/L). On the contrary, the effects of wilting and yellowing appeared on Asparagus aethiopicus that were exposed to different concentrations of AC and MP from the fifth day of the experiment and reached to severe dehydration and plants death at the end of the experiment (Table 2, 3). The dehydration to which Asparagus aethiopicus was exposed was not related to the type or concentration of the pollutant but mainly associated with water stress; since severe dehydration and plant death were appeared on Asparagus aethiopicus in control systems, as shown in Table 2. As for Chlorophytum comosum, plants in control systems grew well, whereas yellowing was observed on the plants due to exposure to high concentrations (100 and 200 mg/L) of both pollutants. Table 2, The physical appearance of selected plants in control systems Time Alternanthera spp Asparagus aethiopicus Chlorophytum comosum Day 0 Day 14 Tap water Tap water Tap water Tap water Tap water Tap water Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 30 Table 3, The physical appearance of selected plants in acetaminophen-exposed systems AC Concentration (mg/L) Time Alternanthera spp Asparagus aethiopicus Chlorophytum comosum 20 Day 0 Day 14 100 Day 0 Day 14 200 Day 0 Day 14 AC 20 mg/L AC 20 mg/L AC 20 mg/L AC 20 mg/L AC 20 mg/L AC 20 mg/L AC 100 mg/L AC 100 mg/L AC 100 mg/L AC 100 mg/L AC 100 mg/L AC 100 mg/L AC 200 mg/L AC 200 mg/L AC 200 mg/L AC 200 mg/L AC 200 mg/L AC 200 mg/L Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 31 Table 4, The physical appearance of selected plants in methylparaben-exposed systems Methylparabalen Concentration (mg/L) Time Alternanthera spp Asparagus aethiopicus Chlorophytum comosum 20 Day 0 Day 14 100 Day 0 Day 14 200 Day 0 Day 14 3.2 Chlorophyll status in plants The reduction in photosynthetic ability can be adopted as an explicit indicator of phytotoxicity that is resulted from exposure to pollutants, as it often arises earlier than the decline in growth parameters [19]. The photosynthetic pigments, is represented by chlorophyll a, chlorophyll b, and MP 200 mg/L MP 200 mg/L MP 200 mg/L MP 200 mg/L MP 200 mg/L MP 200 mg/L MP 20 mg/L MP 20 mg/L MP 20 mg/L MP 20 mg/L MP 20 mg/L MP 20 mg/L MP 100 mg/L MP 100 mg/L MP 100 mg/L MP 100 mg/L MP 100 mg/L MP 100 mg/L Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 32 total chlorophyll, are measured to closely assess the healthy growth trend in the relevant plants during the experiment period. Initially, the differences in total chlorophyll content among the three plants involved in the study are not significant; thereafter (day 14), significant differences were observed between Asparagus aethiopicus and the other two plants (Alternanthera spp. and Ahlorophytum comosum) in all exposure lines (AC, MP and tap water). In contrast, the differences between Alternanthera spp. and Chlorophytum comosum are found to be not significant in all exposure lines. In accordance with the visual observation, the highest reduction in chlorophyll content in control systems (Figure 2) is 81.4% in Asparagus aethiopicus, followed by 15.9% in Chlorophytum comosum and only 6.5% in Alternanthera spp. Fig. 2. Chlorophyll content (a+b) in control systems. Error bars refer to standard deviation (n = 2). In the systems that are exposed to AC (Figure 3), the reduction of the total chlorophyll content in Asparagus aethiopicus is significant for all concentrations (84.9%, 64.6% and 86% for acetaminophen concentrations of 20, 100, and 200 mg/L, respectively). On the other hand, the reduction that is ranged from moderate (3.9– 31.9%) to marginal (4.4–12.3%) in Chlorophytum comosum and Alternanthera spp, respectively. Fig. 3. Total chlorophyll content (a+b) in acetaminophen-exposed systems. Error bars refer to standard deviation (n=2). A A A A B A 0 1 2 3 C h lo ro p h y tu m c o m o su m A sp a ra g u s ae th io p ic u s A lt e rn a n th er a sp p Water control C h lo r o p h y ll a + b ( m g /g F W ) Day 0 Day 14 A A A A A A A A A A B A A B A B B A 0 1 2 3 C h lo ro p h y tu m c o m o su m A sp a ra g u s a et h io p ic u s A lt e rn a n th e ra s p p C h lo ro p h y tu m c o m o su m A sp a ra g u s a et h io p ic u s A lt e rn a n th e ra s p p C h lo ro p h y tu m c o m o su m A sp a ra g u s a et h io p ic u s A lt e rn a n th e ra s p p 20 mg/L 100 mg/L 200 mg/L T o ta l c h lo r o p h y ll a + b ( m g /g F W ) Day 0 Day 14 Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 33 The reduction in chlorophyll content at MP- systems is sharp (Figure 4) for all plants compared to the reduction achieved in acetaminophen. Similarly, Asparagus aethiopicus is the most affected as the reduction in the total chlorophyll content that is ranged between 77.2% to 92.7%. Furthermore, MP causes a 32.6–39.1% chlorophyll reduction in Chlorophytum comosum and 32.6-40.9% in Alternanthera spp. Ismail et al. [20] confirmed that salicylic acid, at a certain concentration (0.10 mM), could improve the chlorophyll content (73.5 µg/g DW) in Ficus deltoidea jack var. trengganuensis; however, the higher concentration (1.00 mM) caused a clear reduction in chlorophyll content (42.1 µg/g DW). Baccio et al. [19] investigated the morpho- physiological and biochemical effects of the environmental and high levels of ibuprofen (0.02, 0.20 and 1 mg/L) in Lemna gibba L. which was considered the smallest ecological indicator for contamination in aquatic environments. The authors confirmed that the detected changes in growth and photosynthetic rates were not sufficient for inducing phytotoxic effects. Kudrna et al. [21] reported that a high concentration of acetaminophen (5 mM) could reduce the intensity of photosynthesis in Lactuca sativa by a maximum of more than 31% compared to the control. Wijaya et al. [22] emphasized that ibuprofen exposure (0, 400, 800, 1,200, 1,600, 2000 mg/L) caused a clear reduction in total chlorophyll content in cowpea (Vigna unguiculata). However, the authors pointed out the ability of the cowpea to develop morphological adaptations to cope under ibuprofen stress. Fig. 4. Chlorophyll content (a+b) in methylparaben-exposed systems. Error bars refer to standard deviation (n=2). 4. Conclusion Ornamental plants that are involved in the study perform differently towards the stresses that are caused by exposure to acetaminophen and methylparaben. Alternanthera spp and Chlorophytum comosum can tolerate high concentrations of AC without obvious symptoms of suffering, as the total reduction in chlorophyll content does not exceed 12.3% and 31.9% for Alternanthera spp and Chlorophytum comosum, respectively, highlighting the potential of these species for AC elimination in aquatic systems; however, these plants are less tolerant with similar methylparaben concentrations. Water stress causes yellowing and death of Asparagus aethiopicus during the experiment, and therefore this plant is unqualified for use in constructed wetlands under hydroponic conditions. It becomes clear that proper selection of plant species in CWs may comprehensively improve the pollutant removal rates due to the different responses of the relevant plant species to PPCPs. Acknowledgements The authors would like to thank the College of Engineering and the Al-Khwarizmi College of Engineering, the University of Baghdad, and the A A B B A A B A B B B B B B B B B B 0 1 2 3 C h lo ro p h y tu m c o m o su m A sp a ra g u s a et h io p ic u s A lt e rn a n th e ra s p p C h lo ro p h y tu m c o m o su m A sp a ra g u s a et h io p ic u s A lt e rn a n th e ra s p p C h lo ro p h y tu m c o m o su m A sp a ra g u s a et h io p ic u s A lt e rn a n th e ra s p p 20 mg/L 100 mg/L 200 mg/L T o ta l c h lo r o p h y ll a + b ( m g /g F W ) Day 0 Day 14 Zahraa Hasan Mutar Al-Khwarizmi Engineering Journal, Vol. 18, No. 3, P.P. 26- 36 (2022) 34 Iraqi Ministry of Higher Education for supporting this research project, and we also express our gratitude to Universiti Kebangsaan Malaysia for the research collaboration through the DIP-2019- 017 grant. 5. References [1] N. Yadav, S. P. Govindwar, N. Rane, H.-J. Ahn, J.-Q. Xiong, M. Jang, S. H. 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Pico, “Ecotoxicological Effects of Ibuprofen on Plant Growth of Vigna unguiculata L,” Plants, vol. 9, pp. 1473, 2020. ) 2022( 26-36، صفحة 3العدد، 18مجلة الخوارزمي الهندسية المجلد زهراء حسن مطر 36 تقييم تحمل نباتات الزينة للتعرض الحاد لألسيتامينوفين والميثيل بارابين في األراضي الرطبة دراسة أولية -المشيدة احمد عبد محمد*** زهراء حسن مطر* أسراء عبد الوهاب البلداوي** نور عزاتي اسماعيل***** سيتي رزيمه الشيخ عبد هللا**** قسم هندسة العمارة / كلية الهندسة / جامعة واسط / العراق * ق العرا / د بغدا جامعة / الهندسة كلية / يةالبيئ الهندسة قسم**** ق العرا / د بغدا جامعة /الخوارزمي الهندسة كلية / االحيائية الكيميائية الهندسة قسم ** ماليزيا /ماليزيا كيبانغسان جامعة /والبيئة المدنية الهندسة كلية /والعمليات الكيميائية الهندسة قسم ***** ،**** zhassan@uowasit.edu.iq*البريد االلكتروني: ahmed.abedm@yahoo.com***البريد االلكتروني: israa@kecbu.uobaghdad.edu.iq** البريد االلكتروني: rozaimah@ukm.edu.my****البريد االلكتروني: nurezatyismail@ukm.edu*****البريد االلكتروني: الخالصة الميثيل بارابين في األراضي الرطبة واالسيتامينوفين مادتيهدفت الدراسة إلى اختيار أنواع نباتات الزينة المناسبة التي يمكن أن تقاوم تراكيزعالية من تراكيز أولية ( لتحمل ثالثة الخشن والغيالن الزاحف النمول، الهليون مادتي االسيتامينوفين من مجم / لتر) ٢٠٠و ١٠٠و ٢٠المشيدة. تم فحص نباتات استخدام و تم بارابين. سعة ٢١الميثيل ذو بالستيكي بشكل ٣دلو برابين والميثيل االسيتامينوفين من تراكيز لثالث المذكورة الزينة نباتات لتعريض لتر النتائج أن كال من نباتي النمول )، بينما تعرضت النبات الى الماء في الدالء الثالث المتبقية التي مثلت نب مادةدالء لكل ٩منفصل ( اتات السيطرة. أوضحت بحوالي الكلي محتوى الكلوروفيل انخفاض في جيدًا لألسيتامينوفين مع أظهرا تحمالً قد الزاحف النمول ٣١٫٩- ٣٫٩٪ و ١٢٫٣- ٤٫٤والغيالن نبات ٪ في مجم / لتر) من ميثيل بارابين أثرت سلبًا على محتوى ٢٠٠و ١٠٠لعالية (، كان من الواضح أن التراكيز ااحف، على التوالي. عالوة على ذلكوالغيالن الز للمل النباتية مهًما في المعالجة دوًرا تلعب الزينة نباتات أن إلى النتائج هذه النباتية الثالثة المعنية. تشير لألنواع العناية الكلوروفيل ومنتجات الدوائية وثات ًيا لمياه الصرف الصحي في المستشفيات. الشخصية ويمكن اعتبارها عالًجا جمال