Tanaman pakcoy memiliki potensi yang baik untuk dibudidayakan. Alih fungi lahan menyebabkan berkurangnya lahan produktif sehingga hidroponik menjadi solusi dari permasalahan tersebut. Tujuan dari ...penelitian ini adalah untuk mengetahui pegaruh jenis media tanam (sekam bakar, cocopeat dan rockwool) dan konsentrasi nutrisi AB Mix (1.000 ppm, 1.200 ppm dan 1.400 ppm) terhadap pertumbuhan dan hasil tanaman pakcoy secara hidroponik sistem sumbu. Penelitian ini dilaksanakan di Kota Mojokerto menggunakan metode Rancangan Acak Kelompok dengan 3 ulangan. Hasil dari perlakuan yang diberikan bahwa jenis media tanam dan konsentrasi nutrisi AB Mix, perlakuan jenis media tanam cocopeat dan konsentrasi nutrisi AB Mix 1.200 ppm berpengaruh terhadap tinggi tanaman, jumlah daun dan berat basah tajuk tanaman pakcoy.
Rockwool fibre, which is the important one of mineral fibres, shows tremendous potential as reinforcing components in composite materials. The purpose of this study is to evaluate the influence of ...rockwool fibre on physical, mechanical and tribological properties of friction composites. The friction composites were fabricated by a compression molder and evaluated by using a friction test machine. The experimental results show that friction coefficient of all specimens has an obvious increasing trend with the increasing of test temperature, the heat fade doesn't occur in the test processes, and the existence of rockwool fibre could remarkable increase friction coefficient and restraint the heat fade at high temperature. Specimen F-3 containing 9 wt% rockwool fibres has the lowest wear rate, and presents best wear resistance. The worn surfaces morphologies were using the Scanning Electron Microscopy (SEM) for the sake of the tribological behavior and wear mechanism. The results reveal that the specimen F-3 presents a smoother friction surface with larger stable contact plateaus.
Rockwool waste in fly ash geopolymer composites Kinnunen, Paivo; Yliniemi, Juho; Talling, Bob ...
Journal of material cycles and waste management,
07/2017, Volume:
19, Issue:
3
Journal Article
Peer reviewed
Open access
Mineral wool waste is often considered unrecyclable, due to its difficult-to-process physical composition, and potential microbial contamination in the post-consumer products. Total mineral wool ...waste generated in the EU is growing continuously and is currently over 2.3 Mt annually, volumetrically accounting for the largest single waste source in some landfills. Here, we take advantage of the alkali-soluble nature of the rockwool waste, and use a combined mixing and dissolution method to prepare this otherwise unusable waste for geopolymerization, with up to 33 % inclusion in the final product. This mixing and dissolution step enables sufficiently high solids content to form a castable geopolymer paste, which forms a rigid matrix and a compressive strength of 12.8 MPa, sufficient for structural applications. This is the first time mineral wool waste has been used as a geopolymer precursor. FESEM and XRD analysis of the formed products were performed to verify geopolymer formation. Using the preparation reported here, otherwise unrecyclable mineral wool waste can potentially be turned into a valuable raw material for geopolymer materials.
•The growing media are affecting the root and aboveground plant growth.•Differences in water retention were consistent with the differences in growth.•Coir medium resulted in stronger growth compared ...to the rockwool media.•The five species of perennials showed different root growth dynamics.•Low root growth resulted in low root uptake activity of 15N.
The vertical orientation of green walls causes a risk of uneven water distribution within the growing medium, and thereby stress on the plant roots. Therefore it was studied how the root and top growth of different species were affected by the water holding characteristics of the growing media.
Five species of hardy perennials (Campanula poscharskyana ‘Stella’, Fragaria vesca ‘Småland’, Geranium sanguineum ‘Max Frei’, Sesleria heufleriana and Veronica officinalis ‘Allgrün’) were grown in 3 types of growing media (coir and 2 of rockwool) in vertical boxes under greenhouse conditions. Root distribution was registered over 52 days and the activity of individual root systems was studied via 15N uptake and plant parameters were measured. The water holding characteristics of the growing media was determined on a sandbox.
From day 21 and throughout the experiment, the plants growing in the coir medium showed stronger root growth compared to the two rockwool media. From day 28 onwards, there was also a difference between the two rockwool media, with a higher root frequency in the less dense medium. This pattern was consistent for all species, even if they showed different root growth dynamics. Fragaria, Geranium and Veronica showed steadily increasing root growth throughout the experiment, whereas Campanula started slow, but showed a strong root growth towards the end of the experiment. Sesleria showed little root growth throughout the experiment. Dry weight and root activity measured as 15N uptake was higher for plants grown in coir than rockwool. The coir medium showed a more gradual water release with increasing tension than either of the rockwool media, corresponding to the water content measured locally in the boxes.
The results confirmed that the growing media affect root and aboveground plant growth. This is consistent with the differences in water retention, as the more even vertical water distribution in the coir medium resulted in stronger growth compared to the rockwool media. The five species showed different root growth dynamics and different abilities to grow in the different media, and 15N uptake showed that low root growth in the rockwool media also resulted in low root uptake activity.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Due to its non-existent recyclability, industrial rockwool fiber wastes have caused environmental and waste management issues, which, therefore, necessitates an effective and sustainable solution. In ...this paper, palm oil-based polyurethane (PU) foam is synthesized, incorporating reclaimed rockwool fibers from discarded industrial insulation system as fillers. The filler loadings were varied from 1 wt.% to 10 wt.%, and fabricated foams were then characterized for their fire retardancy, thermal stability, foam morphology, and mechanical responses. Thermal stability of the foam was significantly improved with inclusion of rockwool fibers as evidenced by marked delay in 50% degradation temperature,
T
50
, as well as char residue yield in thermogravimetry analysis (TGA). In contrast, no noticeable change was detected for its flammability. Both cell sizes and open cell contents increased with filler content, probably due to the filler inducing delayed blowing reaction. Increasing rockwool fiber contents showed limited improvement in compressive properties, which is thought owed to restricted polymer–filler interfacial area for efficient load transfer. This novel composite foam shows potential for application requiring moderate thermal stability and load-bearing capabilities.
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CEKLJ, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
This experimental study aimed to assess the friction performance of nonasbestos organic (NAO) brake pad based on ternary combinations of rockwool, PAN, and cellulose fibers under fade-recovery ...conditions. Four compositions with varying volume fractions of rockwool, PAN, and cellulose fibers were fabricated. The tribological properties of the sample were tested using JF160 Chase tester based on SAE J661. Optimally, the sample with a synergistic combination of rockwool, PAN, and cellulose fibers in proportion of 10:4:4 vol.% exhibited the best overall friction performances. This combination could be used as NAO brake pad material for reliable, efficient, safe, and comfortable braking operations.
The production and use of cannabis for medical purposes has been legalized in Canada and several states in the USA. Due to the historically illegal nature of cannabis, there is very little ...information available in academic publications about appropriate growing media for growing cannabis. The purpose of this review is to provide an overview of the most commonly used growing media for the production of medical cannabis and to discuss their advantages and disadvantages. Based on current knowledge, there is a general agreement on the properties of a suitable growing medium within the cannabis industry. However, there is little consensus among growers on the best growing medium to grow cannabis. Different categories of growing media are widely used in North America. In this review, we classified them into several main categories principally based on the type of material used in their composition and the growth stages of the plant. The main categories include: coir-based, peat-based, rockwool, phenolic foam, and living soil. It is not easy to suggest the best growing medium for cannabis production. Each category of growing medium has its strengths and weaknesses. Overall, it seems that coir-based products are the intermediate substrates showing more advantages and less weakness; however, choosing any of these categories depends a lot on the growing technique and production system. Future research should focus on determining the optimal level of growing media properties to produce high yielding medical cannabis with the desired quality.
Given the rapid growth of the
industry, developing practices for producing young plants with limited genetic variation and efficient growth is crucial to achieving reliable and successful cultivation ...results. This study presents a multi-faceted experiment series analyzing propagation techniques for evaluating proficiency in the growth and development of
vegetative cuttings. This research encompasses various (1) soilless propagation methods including aeroponics, horticultural (phenolic) foam, and rockwool; (2) transplant timings; (3) aeroponic spray intervals; and (4) aeroponic reservoir nutrient concentrations, to elucidate their impact on rooting and growth parameters amongst two
cultivars. Aeroponics was as effective as, and in some cases more effective than, soilless propagation media for root development and plant growth. In aeroponic systems, continuous spray intervals, compared to intermittent, result in a better promotion of root initiation and plant growth. Moreover, raised nutrient concentrations in aeroponic propagation demonstrated greater rooting and growth. The effects of experimental treatment were dependent on the cultivar and sampling day. These findings offer valuable insights into how various propagation techniques and growth parameters can be tailored to enhance the production of vegetative cuttings. These results hold critical implications for cultivators intending to achieve premium harvests through efficient propagule methods and optimization strategies in the competitive
industry. Ultimately, our findings suggest that aeroponic propagation, compared to alternative soilless methods, is a rapid and efficient process for cultivating vegetative cuttings of
and offers sustainable advantages in resource conservation and preservation.
Aims
To investigate community shifts of amoA‐encoding archaea (AEA) and ammonia‐oxidizing bacteria (AOB) in biofilter under nitrogen accumulation process.
Methods and Results
A laboratory‐scale ...rockwool biofilter with an irrigated water circulation system was operated for 436 days with ammonia loading rates of 49–63 NH3 g m−3 day−1. The AEA and AOB communities were investigated by denaturing gradient gel electrophoresis, sequencing and real‐time PCR analysis based on amoA genes. The results indicated that changes in abundance and community compositions occurred in a different manner between archaeal and bacterial amoA during the operation. However, both microbial community structures mainly varied when free ammonia (FA) concentrations in circulation water were increasing, which caused a temporal decline in reactor performance. Dominant amoA sequences after this transition were related to Thaumarchaeotal Group I.1b, Nitrosomonas europaea lineages and one subcluster within Nitrosospira sp. cluster 3, for archaea and bacteria, respectively.
Conclusions
The specific FA in circulation water seems to be the important factor, which relates to the AOB and AEA community shifts in the biofilter besides ammonium and pH.
Significance and Impact of the Study
One of the key factors for regulating AEA and AOB communities was proposed that is useful for optimizing biofiltration technology.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
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