Abstract
The study was conducted to assess the feasibility of using Eisenia andrei earthworms for vermicomposting hop remains from a lupulin extraction enterprises for the brewing industry. Vermicomposting process was conducted within 70 days using hop (Humulus lupulus) wastes blended with horse manure at five different ratios for triplicate in laboratory conditions. Number of worms, cocoons, and hatchlings were observed and recorded weekly as earthworm biomass, population build-up and reproduction biological parameters. The results showed an indirect relationship between the hop content and the growth and reproductive performance of the worms. Notwithstanding this fact, 100% of survival occurred in all combinations. A 50% blend of hop wastes and horse manure is suggested to ensure the optimizing usefulness of E. andrei. In addition, moment of maximum splendour of worm population build-up and reproduction parameters measured was achieved at around 40 or 50 days since the beginning of the test, seeing a clear and widespread decline from that moment.
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Introduction
The global climate emergency situation currently represents a challenge in terms of the maximum use of natural resources. For this reason, at the present time it is working on the implementation of a real circular economy, where waste generation is minimized and, subproducts or remains become new, useful and usable resource or raw materials, avoiding inadequate disposal in landfills [1,2,3].
In application of the waste hierarchy implemented in the European Union, the following level form of recovery of organic waste other than abandonment, landfill disposal or another inefficient forms of recovery such as incineration, would be recycling [2]. For instance, through composting or similar techniques such as vermicomposting, which allow prioritizing the obtaining of quality products (compost and/or vermicompost) to replace raw materials (chemical fertilizers), reducing greenhouse gas emissions and other environmental improvements [4].
Vermicomposting is one of the main worldwide composting techniques used to recycle agro-industries organic waste [5]. It can be carried out, either as a single treatment or also combined with composting as a pre-treatment [6], and despite the fact that the study its use began around the 70 s of the last century [7], today it is still a widely used nature-based solution for organic wastes transformation, such as distilled grape marc [8], olive mill wastewater [9], aquatic weed [10], lavender [11] or the invasive tree Acacia dealbata [12]. This is due to its great potential, low economic cost and its environmental respectful, in order to obtain a high quality compost applicable in the agricultural sector as fertilizer and improver of soil properties [13,14,15,16].
Hop is a perennial climbing plant of the Cannabaceae family, whose dried fruits are essential beer ingredients because they provide a pungent aroma and bitterness flavour [17]. According to the Agriculture and Rural Development of the European Commission data [18], there are about 2,600 hop farms spread across 14 EU countries. This means 26,500 hectares, which represents 60% of the total area used for this crop worldwide, and a production of 50,000 tons per year. As a consequence, the generation of waste from farms and industries where hops is used, is more than foreseeable.
New ways of managing hop sediments from brewing and fermentation of beer are constantly being sought and the existing ones improved as part of the circular economy [19]. Nevertheless, studies in vermicomposting have only focused on brewery industry wastes so far [20, 21], neglecting those from agribusiness for brewery production companies. Although it is true that, recently a traditional and an on-farm composting trials have been conducted. For instance, Afonso et al. [22] transformed hop wastes blended with manure and with wheat straw into compost, with varied results depending on the mixtures made. Luskar et al. [23] obtained positive results in on-farm composting from hop wastes mixed with different additives. In view of the bibliographic reported so far, an absence is noted in the scientific community of the transformation of hop waste through vermicomposting.
The aim of the study was to analyze the potential of this residue to be decomposed through vermicomposting employing Eisenia andrei [24] worms blended with mature horse manure (HM), focusing on biological parameters, in order to cover this scarcity of knowledge in this field. The choice of this species was because it is one of the most used worldwide [12].
To achieve this objective, a laboratory investigation was carried out. Different hop to manure combinations were considered and analyzed by means of biological parameters, such as population variations, sexual development, and reproduction rate, in order to understand the earthworm dynamics versus hop concentration in a ten-week vermicomposting process. Finally, with the present work we want to contribute new knowledge about the vermicomposting of this waste, hops, little studied until now.
Materials and methods
Earthworms, wastes and sampling design
E. andrei earthworms were purchased from Vermican Soluciones de Compostaje S.L., a local company specialising in composting in the Navarrese town of Cordovilla (Spain). Hop wastes (HW) were acquired from a company in the Navarrese town of Olite (Spain) called Montes de Cristal y Acero S.L., which grows and produces hop plants and obtains lupulin as raw material for brewery companies. Horse manure (HM) was collected in an Equine Center in the Navarrese town of Labiano (Spain). Both wastes were used dry for the preparation of the mixtures and their composition are shown in Table 1.
The design of the experiment was an adaptation of a model previously used by other authors [14, 25, 26]. In this particular case, 750 cm3-capacity plastic cups were used, filled each one with 200 g of different combinations of HW and HM. HW and HM were mixed and subjected to vermicomposting in the concentrations of 100:0 (Treatment 1 (T1)), 75:25 (T2), 50:50 (T3), 25:75 (T4) and 0:100 (T5) on a dry weight basis as is shown in Table 2. Those five treatments were carried out for triplicate during 10 weeks in total. In each combination eight young non-clitellated earthworms were added. All test samples were kept under the same moisture (70 ± 10%) and environmental temperature (25 ± 3ºC) conditions during the investigation, using a darkened heating chamber inside a laboratory of the Public University of Navarre as a safeguard place for all the aforementioned combinations.
Biological analysis
Survival, biomass formation and reproduction of earthworms are the best signs to analyse the vermicomposting process [27]. Changes in live weight of earthworms and newly produced cocoons were measured once a week in the plastic containers, following the method used previously by other authors, such as Esmaeili et al. [28] Singh and Suthar [29] or Yadav and Garg [30]. Earthworms and cocoons were separated from the parental waste mixture by hand sorting method. Worms were washed in tap water to remove adhered material from their body and weighted. Adult earthworms were then returned to their original test container whereas cocoons and hatchlings were taken out and put back in separate stock cultures. A similar procedure was used by Bhat et al. [27] or Parthasarathi et al. [31] in earlier studies, to cite a couple of examples.
The growth rate of the worms (GR) and cocoon production (CP) were calculated as shown in Eqs. (1) and (2), respectively.
Total biomass (TB), number of earthworms (NE), number of clitellated earthworms (NCE), number of cocoons (NC), number of hatchlings (NH) and rate of mortality were also taken into consideration and logged.
Statistical analysis
A statistical analysis was carried out using R computer software package. A one-way analysis of variance (ANOVA) was performed to analyze the significant differences between combinations during vermicomposting at 5% level of significance. Tukey’s test was used to determine any significant differences between combinations in the variables of interest. The normality and homoscedasticity of variance for all the variables involved were corroborated in all the cases.
Results and discussion
Both population growth, as well as reproductive issues, are two clear indicators to monitor the process [32]. In the current study, those aforementioned were measured for the epigeic earthworm E. andrei and assessed weekly throughout the vermicomposting period in different treatments and compared weekly till the age of 70 days. Data are presented in Table 3 and Table 4, with a format comparable to other previous studies (e.g. [33,34,35,36]).
Earthworms development
The proper progress of vermicomposting will depend on the substrate used, which evidences into good fattening parameters and sexual maturity in general terms [32, 37, 38]. In this study, population growth, based on TB and GR in the different combinations of HW and HM, was significantly different (p-value < 0.05) throughout the vermicomposting period. All the results are shown in Figs. 1A and B, and Table 3. A positive growth of earthworm during the first weeks can be observed in general, with a subsequent progressive decrease later in time, these changes being more evident with a greater amount of HM. The number of earthworms was also measured, but no change was undergone, keeping the number of eight at all times. The upward trend during the first weeks and the subsequent progressive decline were more noticeable in T5 and T4 (Fig. 1a). The highest TB was achieved in the 4th week for T5 (4.26 ± 0.31), followed by T4 (3.13 ± 0.42). A week earlier, T2 (2.27 ± 0.14) had already reached its maximum peak, while T3 (2.71 ± 0.07) required one more week. T1 (1.81 ± 0.14) took eight weeks to yield its highest value. Similar trends were observed by other researchers, who reported the maximum earthworm biomass amount on weeks 5 and 6 [39, 40] or week 8 [41]. The maximum weight gain followed by weight loss by the time of termination of the experiment was previously reported by other authors as well [40, 42,43,44]. Such a decline was corroborated by few earlier studies and could be explained by the aging of substrate materials [45], the exhaustion of food [40], the reduction of bioavailable nutrients [46] and the conversion of most of the raw substrate to final products [47]. In the case of HM, authors have attributed this weight loss to the conversion of most of the substrate to vermicompost, which cannot further support the worms growth, in concordance with the results of Suthar and Singh [48] for instance. On the other hand, HW was transformed into a kind of thick and earthy-looking paste, whose degradation was slower. Hence, identical TB has been maintained throughout the process, as can be observed in T1. This may have occurred because of the origin, due to HW coming from plants harvested in a green stage and not withered. Consequently, degradation might be slower and more arduous.
As far as GR is concerned, the maximum values were 126.3 ± 16.4 mg/worm/week in T4, followed by 121.3 ± 18.4 in T5, 115.0 ± 15.4 in T3 and 107.5 ± 18.9 in T2. T1 reached the worst maximum value with 54.6 ± 42.5 mg/worm/week (Fig. 1b). All of them occurred during the first week. In spite of the fact that negative values are observed, the final balance after ten weeks is positive. The best GR mean of E. andrei at the end of the vermicomposting period was 22.38 ± 3.95 mg/worm/week in T5, followed by T3 (18.25 ± 2.07), T4 (15.29 ± 4.63) T2 (11.17 ± 2.94) and T1 (7.92 ± 1.68). GR has been considered as an appropriate indicator to assess the earthworm growth in different wastes [44, 49]. The results obtained are far from the great results reported by both Elvira et al. [25], who cited a mean GR for E. andrei of 89,46 mg/worm/week using rabbit manure as feed, and Haimi [50], who informed an E. andrei GR of 75.32 mg/worm/week in batch cultures. Nevertheless, our results have a very close resemblance to earlier studies such as Cluzeau et al. [51], who obtained GR of 31.5 mg/worm/week in batch cultures for immature E. andrei fed on HM and peat, as well as o those of Elvira et al. [52], who recorded 8.75 mg/worm/week in pure cultures and values from 12.25 to 15.61 mg/worm/week in mixed cultures, employing E. andrei + Dendrobaena rubida and E. andrei + Lombricus rubellus respectively. The obtained results were also in concordance with the best GR values of González–Moreno et al. [14], who reported 30.73 and 23.59 mg/worm/week employing E. andrei fed by spent coffee grounds and coffee silverskin, both spiked with HM, respectively, although they also informed of negative GR values for various mixtures. The best combination for vermicomposting HW seems to be a 50%HW-50%HM blend. Moreover, the present study revealed that HW on its own cannot provide better growth medium and nourishment for earthworms. The fact that a waste does not work well on its own has been common in previous vermicomposting studies [14, 53, 54], making spiking with some kind of dung necessary.
Sexual development
Earthworms maturity was determined by visualizing the appearance of the clitellum [55]. Hence, a careful observation of each individual was carried out to analyze sexual development. Clitellum is the reproductive gland used for cocoon production which in mature earthworms generally forms an obvious band around the midsection segments [55]. NCE were statistically different between the different mixtures (p-value < 0.05).
The first clitellate individuals appeared on day 14 in all the combinations except T1, and on day 28 all individuals had the clitellum in T5. Domínguez et al. [39] and our study alike dated 15 days for sexual maturation. Nonetheless, these results, which are shown in Fig. 2, do not resemble other authors’ such as Domínguez and Edwards [56], who reported that not all of the worms had developed a clitellum after 48 days employing E. andrei in pig manure. There is a wide disparity among different authors about the number of days for E. andrei to reach maturity, as shown by previous studies, which show ratios ranging from not reaching sexual maturity to beyond a month. Additionally, Elvira et al. [25] did not report clitellum losses during their study of the E. andrei specimens. In our study, clitellum regression took place, in general terms, after the 7th week. This is probably due to the aforementioned depletion of the substrate. Elvira et al. [57] reported clitellum regressed soon after maturity in dairy sludge spiked with cow manure, and furthermore, a notable scarce number of clitellated worms in pure paper sludge and an absence of clitellum in pure dairy sludge treatment. Neuhauser et al. [58] stated that the time needed for clitellum development varies in direct relationship with the nutrient abundance. In fact, Domínguez et al. [39] stated the difficult to compare their results with those of previous works using different organic substrates and taking longer periods of time to reach sexual maturity. Years later, Mikunthan and Piratheban [59] emphasized this difficulty of comparison between studies. In view of the results obtained, the fact that HW does not provide those necessary nutritional conditions for a complete development of the earthworms can be confirmed.
Cocoon production
CP, besides earthworm weight, is a critical indicator for the growth of earthworms [44]. Edwards et al. [49] reported that the important difference of rates of CP in different organic wastes are related to the quality of the waste material used as feed. In this study, NC and CP were respectively counted and calculated. Figure 3 shows the results.
NC produced by the earthworms were statistically different between the various combinations (p-value < 0.05) along the vermicomposting period, although a great dispersion of the data is evident. Enormous differences between treatments, as well as in terms of the deviations within the same combination in view of the standard deviations (SD), is not surprising since it has also been reported in previous experiments [11, 39]. CP started on the 3rd week in all treatments, except T1. NC increased along the different weeks, reaching their highest value on week 4 for T2, week 5 for T3 and T5, and week 6 for T2. After the maximum peak of these combinations, NC was a constant swing chart, although with a downward trend. It was only at the 7th week that the first cocoons in T1 were found. The peak value of CP was recorded in T5 (2.00 ± 0.54) in the 5th week, whereas the worse was T1 (0.22 ± 0.38) in the 9th week. T5 yielded the best mean CP during all the vermicomposting period with 0.92 ± 0.13 cocoons/worm/week. The trend was downward to a higher amount of HW, with values from the 0.67 ± 0.21 in T4 to the 0.01 ± 0.02 in T1. More data are available in Table 4.
Except for T1, the results are fully aligned with some of the literature published to date. For instance, Frederickson et al. [60] obtained ranges between 0.46 and 1.56 cocoons/worm/week vermicomposting green wastes. Elvira et al. [57] reported CP between 0.055 and 1.12 cocoons/worm/week feeding E. andrei with pure cultures and combination mixtures of cow manure, dairy sludge and paper-mill sludge. Domínguez et al. [39] showed huge differences in total E. andrei cocoon production in the sewage sludge and in the mixtures with the different bulking agents, with ratios between 0.05 and 3.16 cocoons/earthworm/week. Nevertheless, other authors reported higher results in earlier studies, obtaining E. andrei CP of 1.82 [51], 2.14 [25] or 3.08 cocoons/worm/week [50], which suggests that neither wastes were adequate enough.
Hatchling formation
All new juvenile earthworms were counted weekly until the 70th day by hand sorting. Formation of hatchlings were significantly different between the mixtures (p-value < 0.05). Figure 4 shows the results and Table 4 gathers the data.
Hatchlings were observed for the first time in the 5th week in T2, T3, and T5. One additional week was necessary in T4. Hence, fifteen days were necessary between the first appearance of cocoon and hatchling, except for T4. These results are analogous to Kaur et al. [61], who also reported a 15-day period between the first appearance of cocoons and hatchling. Increase in hatchling formation during the present study is also supported by Kaur et al. [61], Chauhan and Singh [62] or Bhat et al. [27], who reported similar upward trends employing Eisenia fetida feeding with different wastes.
The maximum NH were observed in T3 (17.67 ± 0.58) on week 7. It was followed by T5 (16.00 ± 4.58) on week 8, T4 (15.33 ± 5.51) on week 7, and T2 (9.00 ± 6.08) on week 8. The data for total NH and their weight after 10 weeks are shown in Table 3. Moreover, there was no hatchling in T1 and none of the hatchlings developed clitellum in feeds tested at the end of the investigation after ten weeks. Garg et al. [63] informed that there was no hatchling in camel waste in their investigation employing E. fetida. and hatchlings had not developed clitellum either. Gupta et al. [64] also reported no E. fetida hatchlings observed in water hyacinth treatment. The few cocoons produced in T1 are a direct consequence of the lack of hatchlings. In addition, the trend of a higher biomass to a lower quantity of HW, demonstrates that the residue commented throughout this document is not better than manure.
Mortality
Survival is crucial for the determination of the palatability, suitability and other any impact of wastes in order to carry out a correct and safety vermicomposting [11, 65, 66].
In this study, a 100% of survival of earthworms in all treatments occurred. Hence, hop do not have any toxic compounds that disturb the process and endanger the life of the earthworms.
Conclusions
-
A laboratory-pilot-scale assay of vermicomposting of hop wastes have been performed in order to observe E. andrei behaviour in biological terms and contributing new knowledge to the scientific community. The results obtained successfully reveals that HW can be vermicomposted since no negative evidence has been observed in this regard.
-
The absence of mortality confirms that it is not a dangerous fed material for earthworms neither their survival.
-
In addition, moment of maximum splendour of earthworm population build-up and reproduction parameters measured was achieved at around forty or fifty days since the beginning of the test, seeing a clear and widespread decline from that moment.
-
3 weeks were taken necessary to see the first cocoons and five for the hatchlings. Nevertheless, the results also show that large quantities of this waste are not as appetizing as could be predicted initially.
-
Combinations with up to 50% waste had better performance. The higher the percentage of HW is, more negative the impact on the earthworm growth and reproduction performance becomes.
-
Hence, the authors recommend a 50% blend of HW spiked with HM for the vermicomposting of this waste.
Abbreviations
- CP:
-
Cocoon production.
- GR:
-
Growth rate.
- HM:
-
Horse manure.
- HW:
-
Hop waste.
- NCE:
-
Number of clitellated earthworms.
- NC:
-
Number of cocoons.
- NE:
-
Number of earthworms.
- NH:
-
Number of hatchlings.
- SD:
-
Standard deviation.
- TB:
-
Total biomass.
- TBG:
-
Total biomass gain
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Open Access funding provided by Universidad Pública de Navarra. This research was funded by Government of Navarre and European Regional Development Fund (ERDF) grant number VERMICOMPOSTAJE 4.0 (0011-1365-2019-000110) research project.
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González-Moreno, M., García Gracianteparaluceta, B., Marcelino Sádaba, S. et al. A biological insight of hops wastes vermicomposting by Eisenia Andrei. J Mater Cycles Waste Manag 26, 444–454 (2024). https://doi.org/10.1007/s10163-023-01848-9
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DOI: https://doi.org/10.1007/s10163-023-01848-9