Decomposition Of Organic Wastes Research Articles

Acceleration of Organic Compost Supply Using Microbial Consortium Formulation on Various Organic Wastes and their Effect on Sweet Corn

Organic waste, primarily originating from agricultural sources, remains underutilized in Indonesia, despite its substantial potential as an organic fertilizer. Consequently, it is imperative to comprehend the technology capable of efficiently decomposing organic matter and yielding high-quality compost. This study aimed to investigate the impact of a microbial consortium compris-ing Bacillus sp., Pseudomonas sp., Trichoderma sp., and Aspergillus sp. on the decomposition of organic waste derived from rice, sugarcane, corn and as well as to examine its application to sweet-corn (Zea mays var. saccharata). The study used a factorial randomized block design, featuring two primary factors, compost types and their respective doses. This design in total of nine treatments, each replicated three times, thus resulting in a sum of 27 experimental units. The treatments were RSC: Rice straw compost; SLC: Sugarcane leaves compost; CHC: Corn husk compost; D7.5: Compost dose of 7.5 t ha-1; D15: Compost dose of 15 t ha-1; D22.5: Compost dose of 22.5 t ha-1. Moreover, an essential fertilizer, NPK, was applied at a rate of 200 kg/ha. The find-ings demonstrated a substantial impact of both compost types and doses on maize growth parameters, which encompassed plant height, leaf area, chlo-rophyll contentand dry weight. These effects were observed individually, without any interactions between the two factors. Furthermore, these treat-ments exhibited a discernible influence on corn yield. The highest to lowest yields were recorded as follows: CHC (9.29 t ha-1), RSC (8.72 t ha-1), and SLC (8.00 t ha-1). Combining organic compost with chemical fertilizer effectively prevented nutrient loss through denitrification and evaporation, facilitating nutrient retention and controlled release over time.

Synthesis and Photoreforming Reaction of CdS Prepared from MOF Precursor

AbstractThe photoreforming reaction, which can produce hydrogen simultaneously with the decomposition of organic waste, is a promising method for resolving longstanding global issues such as the depletion of energy resources and climate change. However, ZnS photocatalysts, one of the most optimal catalysts for such reactions, has an inadequate visible‐light response; thus, the extensibility of the reaction is limited. In this study, CdS photocatalysts are prepared from metal–organic framework (MOF) precursors, that is, Cd‐MOFs. The prepared CdS exhibits high hydrogen production activity in the photoreforming of lignocellulosic biomass under quasi‐sunlight conditions. This activity is approximately 13.4 times that of the CdS prepared via the conventional hydrothermal method. Further, CdS can utilize light energy in the visible region of sunlight, providing a high quantum yield and demonstrating the potential for the extensibility of the reaction. The results of this study will facilitate the fabrication of novel materials for sustainable and efficient hydrogen production.

A Comprehensive Design and Performance Assessment of a Reel-Type Blade Organic Waste Chopper Machine

The global issue of organic waste poses a serious threat to the environment and public health. With the increasing production of organic waste driven by population growth and urbanization, waste management systems worldwide are confronted with inevitable pressures. The decomposition process of organic waste generates methane gas, contributing not only to global climate change through the greenhouse gas effect but also posing risks of air and water pollution. The primary function of organic waste lies in its ability to become a valuable resource through recycling and composting processes. The potential use of organic waste as a source of renewable energy through biogas or biomass production also presents promising prospects. The objective of this research is to design a reel-type chopper machine for more optimal waste processing. The research method employed is engineering, involving non-routine design activities to create something new in both process and form. The results of the study show that the designed reel-type organic waste shredder has dimensions of 800 mm in length, 750 mm in width, and 1042 mm in height. The machine consists of four main components: the frame hopper, shredding cylinder, and discharge hole. The chopper machine has a power of 2.2 kW, a chopper capacity of 1 ton/hour, and a cutting length of 2–5 cm. The advantages of the shredded output from this reel-type chopper machine can accelerate the decomposition and fermentation processes of organic waste. The smaller and uniformly shredded particles provide a larger surface area for the activities of decomposing microorganisms. Additionally, reel-type machines are more efficient in processing materials with high moisture levels, such as wet branches or leaves. By ensuring optimal particle size, reel-type machines also enhance the efficiency of composting, as well as the production of compost briquettes and briquettes fueled by organic waste. Therefore, the role of reel-type organic waste shredder machines is crucial in maximizing the value of organic waste, accelerating the recycling cycle, and effectively reducing environmental impact.

Decarbonizing our environment via the promotion of biomass methanation in developing nations: a waste management tool

Abstract For a long time, fossil fuel has been a part of our everyday lives and has constantly led to the emission of carbon dioxide (CO2) into the environment. The release of methane (CH4) into our surroundings can be caused by the decomposition of organic wastes produced by our daily activities; CH4 produced by human activity is responsible for at least 25 % of global warming. CH4 is a known potent greenhouse gas that can trap about 35 times more heat than CO2. These greenhouse gases play a role in climate change and global warming. It, therefore, becomes important to explore measures for decarbonizing our environment. Biomethane production using our generated waste is a promising decarbonization approach with significant potential for mitigating greenhouse gas emissions. This paper overviews potential biomass methanation feedstocks and investigates several technologies, such as anaerobic digestion, combined pyrolysis and methanation, and combined gasification and methanation. SWOT analysis of waste conversion to biomethane was conducted, and important points related to the scaling-up of biomethane production processes were outlined. Also, insights into prospects for promoting biomass methanation deployment were provided. In conclusion, biomass methanation has great potential for producing sustainable energy. Hence, collaboration between industrialists, researchers, government agencies, and stakeholders including an understanding of the financial investments, return on investments, or potential subsidies and incentives could enhance the practicality of the proposed solution. Research and development should be continuously carried out as they are necessary to scale up and promote the technology. Also, there should be technical training for stakeholders as it is essential for the smooth development of the sector.

Biodrying of municipal solid waste-correlations between moisture content, organic content, and end of the biodrying process time.

Biodrying refers to the decomposition of organic municipal solid waste (MSW) under aerobic conditions. This process usually lasts 14days and requires large amounts of air to be injected into the waste matrix. The efficiency of the biodrying process depends on several geotechnical parameters, including initial moisture content, initial organic content, bulk density, dry density, solid particle density, and porosity. To examine the potential influence of these parameters on the biodrying process, we analyzed 13 biodried MSW samples. The results revealed a strong positive linear relationship between the initial moisture content and the mass loss percentage. In the first three days of the biodrying process, the waste mass rapidly decreased; afterwards, the daily mass loss occurred at a less rapid, more constant rate. The established average mass removal ratio between the volatile solids and water was 1:6.38 with a standard deviation of 1.06. Dry and solid particle densities were preserved in all 13 experiments; thus, the corresponding void ratio remained unchanged. This finding suggests that the settlement and degradation of MSW that occur during the biodrying process did not significantly influence the airflow rate.

The Overview of Indonesia Coal Bed Methane Resources

Coal Bed Methane (CBM) is generated by coal layers, there is a preceding process, which is the formation of coal (coalification). Coalification begins with the burial of organic material originating from plants. The burial, lasting hundreds of millions of years, results in increasing temperatures and pressures, causing physical and chemical changes to the organic material. Methane gas, the largest component of CBM, is formed. Two processes: biogenic and thermogenic. In the early stages of coalification, biogenic methane gas is produced as a byproduct of the activities of decomposing microorganisms (anaerobic bacteria), similar to what occurs in the decomposition of organic waste. Only about 5 to 20 percent is stored within coal. There are four mechanisms for gas storage in coal: absorption, adsorption, free gas, and gas dissolved in water. Among these four mechanisms, adsorption is the most significant, accounting for 98 percent of the stored CBM in a combined system of micropores (coal matrix) and cleats. Coal Bed Methane resources in Indonesia can be found across South Kalimantan, East Kalimantan, Sumatra, and Java.

Modeling and optimization of controlled landfill gas performance using LandGEM

Modeling with LandGEM offers a large field to quantify emissions from the decomposition of organic waste, consequently prediction of energy generated from gas emissions especially those of methane. Where, the simulation results makes it possible to define the reasons of malfunction concluded by comparing between the LandGEM simulation and the experimental methodology for estimation of methane gas emissions, whose offer a huge knowing, accuracy assessment, and detailed analysis to landfill site state in terms of the production of methane, the tightness, the progress of the anaerobic degradation, the existence of sulfur compound. This study accomplished in site the methane production at 80%, a tightness of 84% compared to the 100% given by LandGEM, and an hydrogen sulfide content which far exceed the recommended limit, cause of corrosion attacking especially the biogas compressor which provoke a complete shutdown to product the electrical energy. Unlike the LandGEM digital model, whose site must produce 3,145.107 m3 of methane with 100% site tightness, a hydrogen sulfide content equivalent to 40 ppm, for a production of electrical energy equivalent to 10,941.107kWh according to the year ‘2022’. To optimizing landfill gas performance, we forecast the installation of automatic analyzer sensors to anticipate of an alert for intervention, generated by accidental loss of methane in the air, infiltration of oxygen inside the lockers, disruption of the stability of the fermentation process, or existence of high sulfur contents in organic matter.

Comprehensive review on oyster mushroom species (Agaricomycetes): Morphology, nutrition, cultivation and future aspects

Huge volumes of organic matter are produced on earth via photosynthesis and their disposal is a serious threat to the environment and public health all over the world. Nevertheless, these agricultural wastes possess a chemical composition conducive to mushroom cultivation. Lignocellulosic wastes, comprising cellulose, hemicellulose and lignin, offer vital nutrients for mushroom growth. Oyster mushrooms are well known for their unique ability to degrade lignocellulosic materials, making them valuable contributors to the process of organic waste decomposition and nutrient cycling in ecosystems. Employing agricultural by-products as a substrate for mushroom cultivation presents a sustainable approach to waste reduction and the production of nutritionally enriched food. Cultivating oyster mushrooms, presents an economically feasible and environment friendly method of transforming waste materials into highly nutritious food. These edible mushrooms are widely grown worldwide, comprising around 27 percent of the total global production. Oyster cultivation has rapidly increased in Asia due to its low production technology, easy availability of substrates, temperature tolerance and high yield capacity. Oyster mushrooms are sought after as a functional food due to their appealing taste, aroma, flavor, nutritional benefits and medicinal properties. They contain high levels of protein, fiber, vitamins B complex, C and D2, as well as minerals like potassium, phosphorus, selenium, zinc and essential amino acids. These mushrooms are versatile, as they thrive in both tropical and temperate regions without requiring complex controlled environmental conditions for growth. This review article provides insights into the cultivation aspects of important oyster species including a novel species called Hypsizygus ulmarius. Oyster mushroom cultivation is rapidly growing in developing countries, where it can contribute to food security for the world's growing population, which is expected to reach 9.7 billion by 2050.

Implementasi Kebijakan Pengelolaan Sampah di Dinas Lingkungan Hidup Kota Cimahi

The purpose of this study is to find out the implementation of waste management policies at the Cimahi City Environment Agency (DLH) using a qualitative method with a descriptive nature. Data was collected by observation, documentation and interview techniques. Based on the research conducted, it can be concluded that (1) the implementation of waste management policies in Cimahi DLH City has been carried out properly in accordance with Cimahi City Regional Regulation No. 6/2019. However, not all of it can be carried out effectively because not all waste at the TPS can be transported to the TPA every day, this is due to weather factors, infrastructure and inadequate infrastructure. (2) The lack of human resources at DLH Cimahi City is due to the limited recruitment of employees according to staffing regulations. To overcome this, employee training is carried out; (3) Implementation of waste management policies carried out by DLH Cimahi City, namely the Maggotization program, namely the decomposition of organic waste by utilizing maggot larvae and several ways of managing waste, namely through the Cimahi People's Movement to Sort Waste (Gerak Ompipah) and also Together Reducing Waste (Barengas) ; (4) The strategy for disseminating information on the application of waste management policies in Cimahi City is carried out through education and outreach from DLH Cimahi directly to the public.

Dynamics of microbial populations in the composting process of marine organic waste

It is estimated that marine waste consist of 60% organic material. Therefore, waste must be handled using a composting process. The main determining factor in the composting process is the microorganisms associated with the C/N ratio. Therefore, this research was conducted to observe the dynamics of microbial populations during the decomposition of marine organic waste. The research method for calculating microbial populations (bacteria and fungi) is the dilution method using a colony counter with the Pour Platedilution technique (CFU/g). The results showed that the microbial population, both fungi and bacteria, fluctuated from week 1 to 10 of the composting process. This is related to the temperature during the composting process and the C/N ratio. The highest population of bacteria and fungi was found in the sixth week of composting at 300 x 107 CFU/g where the process entered the thermophilic phase with a C/N of 55.

SPATIAL VARIABILITY OF METHANE EMISSIONS FROM SOILS OF WET FORESTS: A BRIEF REVIEW

SPATIAL VARIABILITY OF METHANE EMISSIONS FROM SOILS OF WET FORESTS: A BRIEF REVIEW

Exploration The Candidates of Xenobiotic Degrading Indigenous Bacteria from Probolinggo City Landfill by Using Next Generation Sequencing (NGS)

Soil bacteria from tropical environments play a significant role in resolving various environmental issues, including biodegradation. Exploratory research on biodiversity is crucial to develop and harness the potential of different types of soil bacteria that are highly abundant. The bacterial diversity in landfills is typically high due to the decomposition of organic and inorganic waste, creating a favorable medium for the growth and development of soil bacteria. This study aims to assess the candidates of xenobiotic degrading indigenous bacteria from the Probolinggo City landfill using Next Generation Sequencing (NGS) method. The research stages include: 1) sampling, 2) isolation of genomic DNA from samples using the ZymoBIOMICS DNA MiniPrep Kit from Zymo Research, 3) amplification of isolated DNA with primers 16S 27F – 1429R, 4) sequencing the results of DNA amplification with NGS, 5) downstream analysis of the results using software Pavian Krona Tools, and 6) narrative analysis review to identify the candidates of xenobiotic degrading indigenous bacteria. The results show that soil samples from the Probolinggo City landfill exhibited a high diversity of bacterial communities. Based on NGS analysis, 2400 bacterial species were identified, comprising 56 genera, 17 orders, 4 classes, and 4 phyla, with respective abundances of Proteobacteria (70%), Firmicutes (15%), Planctomycetes (2%), and Cyanobacteria (0,3%). Based on the narrative analysis review, several bacteria in the Probolinggo City landfill exhibited potential as: 1) polypropylene-degrading bacteria, including Bacillus cereus, B. licheniformis and B. thuringiensis. 2) styrofoam degrading bacteria, namely Bacillus amyloliquefaciens, Bacillus cereus, Bacillus firmus and Pseudomonas aeruginosa. 3) total ammonia nitrogen (TAN) reducing bacteria, including Bacillus megaterium. 4) pesticide degrading bacteria Profenofos and Chlorantraniliprole, including Bacillus stearothermophilus. and 5) tannic acid degrading bacteria, including Pantoea dispersa. These results indicate that the Probolinggo City landfill is a good habitat for various xenobiotic-degrading bacteria, then the isolation of specific bacteria can be designed using an appropriate selective medium.

AVALIAÇÃO DO POTENCIAL METANOGÊNICO DE CHORUME GERADO EM ATERRO DE RESÍDUOS SÓLIDOS DOMICILIARES: O CASO DO CONSÓRCIO INTERMUNICIPAL DO PONTAL DO PARANAPANEMA (CIPP)

Leachate is a liquid produced by the decomposition of organic and inorganic waste in landfills and can pollute soil and groundwater, as well as pose a risk to public health if not properly managed. In this work, the methanogenic potential of the leachate generated in the landfill of the Intermunicipal Consortium of Pontal do Paranapanema was evaluated to estimate the volume of biomethane produced from the leachate. Subsequently, an environmental and economic assessment was made of the potential replacement of diesel used by the waste collection fleets of the member municipalities of the consortium with biomethane. The results indicate that biomethane would supply 23.2% of the demand for fossil fuel, providing savings and a reduction in the amount of CO2 emitted into the atmosphere. This study demonstrated that the biomethane generated from landfill leachate can be an important source of renewable energy generation for the Intermunicipal Consortium of Pontal do Paranapanema to replace the diesel used by the waste collection fleets with biomethane.

Uncovering nutrients and energy related gene functions of black soldier fly Hermetia illucens strain KUP

The black soldier fly (Hermetia illucens) has emerged as a significant insect species in the decomposition of organic waste for sustainable agricultural practices. Due to its remarkable characteristics and performance, H. illucens is increasingly utilised for insect farming, particularly for industrial-scale rearing throughout the world. In this study, we employed whole-genome sequencing to annotate the gene and protein functions of H. illucens and to explore the functional genomics related to nutrients and energy. As a result, a genome size of H. illucens strain KUP 1.68 Gb with a GC content of 42.13 % was achieved. Of the 14,036 coding sequences, we determined the function of 12,046 protein-coding genes. Based on metabolic functional assignment, we classified 4,218 protein-coding genes; the main category was metabolism (32.86 %). Comparative genomic analysis across the other H. illucens strain and insect species revealed that the major metabolic gene functions and pathways related to nutrient and energy sources of H. illucens KUP are involved in key amino acid metabolism (e.g., cysteine and methionine) as well as fatty acid biosynthesis and glycerolipid metabolism. These findings underscore the metabolic capability and versatility of H. illucens, which is regarded as a potential source of proteins and lipids. Our study contributes to the knowledge regarding the feed utilisation of H. illucens and offers insights into transforming waste into valuable products. H. illucens has the potential to create globally sustainable nutrients and environmentally friendly solutions, aligning with the goal of responsible resource utilisation.

Identification of bacterial community in a rapid composting method using 16SrDNA genes sequencing.

Composting is a process of microbial degradation of organic waste and is commonly applied for waste management. This is a slow process and requires a lot of land and human resources. The present study investigated mechanical augmentation with required microbial culture for composting municipal solid waste (MSW). Thirty isolates were subjected to 16S rDNA PCR amplification and gene sequencing. The isolates' sequencing from the compost samples was processed on BLASTn. Fourteen strains were identified for further experiments. The results divulge that Empedobacter (04), Bacillus (02), Proteus (02), Lactiplantibacillus (01), Klebsiella (01), Citrobacter (01), Brevibacillus (01), E. coli (01) and one unidentified strain were growing during composting. Eleven combinations of bacterial consortium and respective additives were applied for the organic waste decomposition in the next stage, resulting in varied completion periods ranging from 3 to 14days. Two combinations were completed within 3days, which are considered ideal combinations for composting. The microbial consortium was significantly diverse, which is a reason for rapid biodegradation. The present study reveals that the technology will be highly feasible for municipal solid waste management in tropical/subtropical countries.

Novel and facile strategy for immobilization of Ag3PW12 crystals on graphitic carbon nitride (g-C3-N4) sheets, a superior photocatalyst for decomposition of organic waste

The high electron-holes recombination rate in pure graphitic carbon nitride (C3–N4) restrict their photocatalytic efficiency. In this research work, we successfully immobilized Ag3PW12O40 a polyoxometalate-base crystal on graphitic carbon nitride 2D sheet through physical grinding method to prevent charges recombination on the surface. Both the materials were prepared separately and then grinded after mixing, to get C3–N4@Ag3PW12 heterojunction. The prepared C3–N4@Ag3PW12 composites were tested with different characterization techniques to confirm its structural integrity and successful fabrication of heterojunction. The composite catalyst showed expansion in UV light absorbance where it promotes from 406 nm to 454 nm for pure C3–N4 and composite C3–N4@Ag3PW12-30 % respectively. The composite showed better electron-holes separation, confirmed from its electrochemical performance such as TPC (total photocurrent) and PL data. The prepared catalysts were tested for the degradation of two types of organic dyes such as methylene blue and Rhodamine B under photoirradiation. The C3–N4@Ag3PW12-30 % composite photocatalyst showed efficient photocatalytic activity and removed 99 % methylene blue in 75 min while removed 99.4 % Rhodamine B in 60 min while the pure Ag3PW12 and C3–N4 could only remove 26.3 % and 37.7 % methylen blue and 43.54 % and 53.38 % rhodamin B respectively, in the same conditions. The results show that, the Ag3PW12 crystals deposition on C3–N4 2D sheets is a preferred approach to enhance the catalytic performance of C3–N4 2D sheet.

Determination of effects of thermophilic and hyperthermophilic temperatures on anaerobic hydrolysis and acidogenesis of pig manure through a one-year study

Improving hydrolysis and acidogenesis through thermophilic and hyperthermophilic temperatures is critical for enhancing the anaerobic decomposition of organic waste like pig manure. However, whether higher temperatures can provide more enhanced performance has not been elucidated experimentally. This study, therefore, conducted a 375-day continuous operation experiment at 55 and 70 °C with a 5-day hydraulic retention time. The two temperature reactors entered a stable state after about 200 days and long-term microbial acclimation markedly changed their performances. In the thermophilic and hyperthermophilic reactor, the hydrolysis efficiencies were obtained at 29.7 % and 27.3 % respectively, whereas the acidogenesis efficiency was relatively low at 1.0 % and 3.1 %. Due to the occurrence of methanogenesis, the volatile fatty acid concentration in the thermophilic reactor was only 45 % of that in the hyperthermophilic reactor. The thermophilic reactor exhibited higher bacterial diversity; however, this difference between the two reactors apparently did not correlate with hydrolysis and acidogenesis performance.

The cooperation of microorganisms, bacteria, mold, yeast, and Actinomycetes consortium on decomposition of household organic waste in lowering C/N ratio

Abstract. Prihastini L, Ramelan AH, Setyono P, Pranoto. 2023. The cooperation of microorganisms, bacteria, mold, yeast, and Actinomycetes consortium on decomposition of household organic waste in lowering C/N ratio. Biodiversitas 24: 4862-4869. This study aimed to investigate the effective management of household waste that can lead to environmental pollution when not appropriately managed. Composting has emerged as a promising, cost-effective, and sustainable solution to address the issue of organic waste management. Furthermore, this study identified the best bioinoculants with the ability to lower the C/N ratio on the decomposition of household organic waste. It was performed with Factorial Completely Randomized Design A×B, where the A factor was bioinoculant formulas (16 formulas) and the B was the decomposition period (0, 1, 2, 3, and 4 weeks). The decomposition process was conducted at the 0, 1st, 2nd, 3rd, and 4th weeks with the C/N ratio examination. The collected data were subjected to ANOVA testing and further analyzed using the Duncan test. The results showed the lowest C/N ratio with the addition of bioinoculant code A14 (14.87) and the highest C/N reduction percentage with the addition of bioinoculant code A14 (82.7%). The best bioinoculant was treatment with A14, namely the combination of the mold consortium, yeast, and Actinomycetes. However, treatment with the addition of A14 code bioinoculant was no different from A13 code since both have the same lowercase code (i). The A13 code treatment was not significantly different from A8 since both had the same lowercase code (h).

A Sustainable Approach to the Conversion of Waste into Energy: Landfill Gas-to-Fuel Technology

Landfill gas (LFG) is a methane-rich gas produced by the decomposition of organic waste in landfills. It has the potential to be a greenhouse gas, but it can also be a valuable source of energy. LFG can be used to generate electricity, heat, or fuel. Renewable natural gas, abundant in methane derived from organic matter or waste streams, can undergo processing to align with established specifications for conventional fossil natural gas pipelines and vehicle use. This article assesses the present state of understanding concerning the transformation of landfill gas into a valuable fuel resource. This study shows the methods for LFG collection and conversion into usable fuels, along with the environmental benefits and challenges associated with its utilization and usage. In this study, a thorough examination was conducted concerning the waste generated in residential communities, specifically within the rural districts of Adana, known as the Yedigoze region. This research focused on assessing the gas potential derived from these waste materials and their potential environmental implications when employed as a fuel source for municipal buses. The transitioning analysis of 50 diesel buses to compressed natural gas (CNG) buses resulted in a remarkable reduction of 950,625 kg of CO2 emissions in one year.

Suaeda australis and its associated rhizosphere microbiota: a comparison of the nutrient removal potential between different shrimp farm sediments in New Caledonia.

Shrimp rearing generate organic waste that is trapped in the pond sediment. In excess, these wastes may impair aquaculture ecosystem and shrimps' health. To promote the biological oxidation of accumulated organic waste, the pond is drained and dried at the end of each production cycle. However, this practice is not always conducive to maintaining microbial decomposition activities in sediments. Shrimp production in New Caledonia is no exception to this problem of pollution of pond bottoms. One promising way of treating this waste would be bioremediation, using a native halophyte plant and its microbiota. Thus, this study explored the nutrient removal potential of Suaeda australis and its microbiota on sediments from four shrimp farms. Suaeda australis was grown in an experimental greenhouse for 6 months. In order to mimic the drying out of the sediments, pots containing only sediments were left to dry in the open air without halophytes. An analysis of the chemical composition and active microbiota was carried out initially and after 6 months in the sediments of the halophyte cultures and in the dry sediments for each farm, respectively. In the initial state, the chemical parameters and the microbial diversity of the sediment varied considerably from one farm to another. Growing Suaeda australis reduced the nitrogen, phosphorus and sulfur content in all type of sediment. However, this reduction varied significantly from one sediment to another. The rhizosphere of Suaeda australis is mainly composed of micro-organisms belonging to the Alphaproteobacteria class. However, the families recruited from this class vary depending on the farm in question. Depending on the sediment, the variation in microbiota leads to different putative biochemical functions. For two of the farms, a similar reduction in nitrogen concentration was observed in both dry and cultivated sediments. This suggests that certain initial chemical characteristics of the sediments influence the nutrient removal efficiency of Suaeda australis. Our study therefore highlights the need to control the pH of sediments before cultivation or in dry sediments in order to ensure optimal microbial decomposition of organic waste and nutrient cycling.