Optimization of Coco Peat Processing for Salt Removal Efficiency and Environmental Sustainability

DOI : 10.17577/IJERTCONV12IS03041

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Optimization of Coco Peat Processing for Salt Removal Efficiency and Environmental Sustainability

Optimization of Coco Peat Processing for Salt Removal Efficiency and Environmental Sustainability

Dr. M. Mohammadha Hussaini Head of the Department Department of EEE

Government College of Engineering, Erode Tamil Nadu, India hussaini1008@gmail.com

Dr. K. Tamilselvan Assistant Professor Department of EEE

Government College of Engineering, Erode Tamil Nadu, India ktamilselvan@gmail.com

Dr. S. Dhanapal Assistant Professor Department of EEE

Government College of Engineering, Erode Tamil Nadu, India sdhanapalirtt@gmail.com

Vimal M A

(Final year Student of EEE) Government College of Engineering, Erode

Tamil Nadu, India antonyvimal2002@gmail.com

Abstract This paper proposes an optimized process for the processing of coco peat aimed at enhancing salt removal efficiency while promoting environmental sustainability. The study addresses challenges associated with salt accumulation in coco peat, hindering its use in agriculture and horticulture. The proposed process includes pre-processing steps such as size reduction, washing cycles with multiple flushes of fresh water, and counterflow systems for efficient salt extraction. Additionally, the paper discusses rinsing cycles, dewatering methods using screw presses, and hot air-drying techniques to expedite the process. Considerations for process monitoring, grading and economic analysis. This comprehensive approach balances salt removal efficiency with environmental sustainability, enhancing the quality and usability of coco peat.

Keywords coir pith, coco peat, drying, conveyor, washing, rinsing, removal of salt, filtering


    Coco peat, derived from coconut husks, is prioritized in agriculture for its water retention and aeration properties. However, salt buildup poses a challenge, hindering plant growth and soil quality. Existing processing methods often struggle to remove salts effectively, impacting crop yields and the environment. This paper proposes a holistic approach to coco peat processing, aiming to enhance salt removal efficiency and sustainability. By innovating pre-processing, washing, rinsing, dewatering, and drying techniques, we address salt accumulation challenges. Objectives include optimizing salt removal and ensuring environmental responsibility. Subsequent sections detail our proposed approach, covering various processing stages and considerations like monitoring and compliance. This analysis aims to offer insights into optimizing coco peat processing for improved efficiency and sustainability.


    Previous research highlights the challenge of salt accumulation in coco peat and its adverse effects on plant growth and soil quality. Traditional processing methods often struggle to remove salts effectively, impacting crop yields and

    the environment. Studies suggest various approaches to enhance salt removal efficiency. Ravindran et al. (2015) propose multiple flushing cycles with freshwater, while Rajkumar et al. (2018) advocate for counterflow washing systems. Kumara et al. (2019) explore the use of salt-tolerant bacteria during soaking to improve efficiency. However, further optimization is needed for practical application. This paper aims to build upon existing research by proposing a holistic and sustainable approach to coco peat processing that addresses salt accumulation challenges effectively.


    The market demand for coir pith, also known as coco peat, has been on an upward trajectory due to its versatile applications in agriculture and horticulture. Coir pith is highly valued as a soil conditioner and a soil-less medium for agricultural purposes, particularly in hydroponics and container plant growing. Its popularity stems from its sustainability, water retention capacity, and aeration benefits, making it an excellent alternative to peat moss.

    According to recent reports, the export of coir and coir products from India, which is one of the largest producers, has seen a significant increase. In the year 2020-21, there was a 17.6% increase in quantity and a 37% increase in value compared to the previous year, setting an all-time high record. Coir pith alone constituted 51% of the total export of coir products from the country, with export earnings of Rs.1919.74 crores.

    The demand for coir pith is particularly high in countries like Holland, the United States, Europe, and China. It is also growing in many West Asian countries due to its enhanced qualities as a soil conditioner. Factors such as the increasing demand for organic food, rising environmental concerns, and the need for sustainable agricultural practices are driving the growth of the coir pith market.

    This growing demand is indicative of the global shift towards more eco-friendly and sustainable agricultural inputs, positioning coir pith as a key player in the international market for soil amendments and growing mediums.


    This project is focuses on enhancing coco pith for agricultural use by reducing its salt content. It covers the process from initial treatment to agricultural readiness, assessing the treated piths viability for plant growth and environmental benefits. The step-by-step process are

    1. Moisturizing the Coco Pith

    2. Soaking in Water Tanks

    3. First Filtration Process

    4. Dewatering with Roller Press

    5. Rinsing with Fresh Water

    6. Second Filtration Process

    7. Pressing with Screw Press

    8. Drying in Heating Chamber

    1. Moisturizing the Coco Pith

      Moisturizing the coco pith is the initial step in this process of preparing it for agricultural use, specifically aimed to reducing its salt content. The collected coco pith is placed on a conveyor belt system. As it moves along the conveyor, water is sprayed onto the pith. This step is crucial as it initiates the leaching process, where soluble salts begin to dissolve and wash away from the pith.

    2. Soaking in Water Tanks

      After the initial moisturizing, the pith is transferred to a soaking tank where it is submerged in excess water. This soaking process helps to further leach out the salts. The duration of soaking can vary from 30 to 40 min, but it is typically long enough to ensure a significant amount of salt is removed.

    3. First Filtration Process

      This part would detail the first round of filtration, which is crucial for removing the dissolved salts from the water after the initial soaking. It involves passing the soaked coco pith through a filtration system, which includes screens or mesh filters. These filters retain impurities such as fibrous chunks

      and sand while allowing water and smaller particles to pass through. Salt particles are also extracted during this step, contributing to the overall quality of the final coco peat product. Effective filtration is essential for various agricultural applications.

    4. Dewatering with Roller Press

      Its purpose is to reduce the moisture content of the wet coco peat. The roller press consists of two counter-rotating cylindrical rollers. As these rollers rotate, they aply pressure to the coco peat, effectively squeezing out excess water. The water is collected and drained away. Operators can adjust the pressure settings based on desired moisture reduction. This continuous process minimizes the risk and enhances the overall quality of the coco peat.

    5. Rinsing with Fresh Water

      After initial washing cycles, the soaked coco pith undergoes further cleansing through rinsing with fresh water to remove any remaining salts that were not eliminated during the first filtration process. This step ensures that any remaining impurities, residual salts, or contaminants are thoroughly removed. The rinsing time about 10 to 20 mins. The rinsed coco peat is then ready for second filtration process stage.

    6. Second Filtration Process

      The second filtration process refines the material by extracting any remaining fine particles and salt traces, resulting in high-quality coco peat suitable for various applications.

    7. Pressing with Screw Press

      Its primary goal is to compact the moistened coco pith by applying pressure. The screw press consists of a rotating screw within a cylindrical chamber. As the screw turns, it pushes the coco peat forward, compressing it against the chamber walls. This action effectively squeezes out excess moisture, enhancing dewatering. The resulting material achieves a uniform density, making it easier to handle and transport. After pressing, the coco peat is ready for final stages such as drying.

    8. Drying in Heating Chamber

    The final step involves drying the coco peat in controlled heating chambers. These chambers maintain consistent temperature and humidity levels, allowing for efficient evaporation of excess moisture. Proper drying reduces the risk of microbial growth, improves storage, and ensures the stability of the coco peat for its intended uses.

    A heating chamber equipped with a heating coil, blower, and sensors provides precise control on over coir pith drying. The insulated chamber traps heat generated by the coil, while the blower ensures even air circulation for uniform drying

    A temperature sensor constantly monitors the air temperature and feeds data to a control system that adjusts the heating coil based on a pre-set level.

    Moist coir pith spread within the chamber is exposed to warm, circulating air, causing moisture to evaporate and be carried away by the airflow.

    The system can optionally include a moisture sensor to directly track the coir pith's moisture content, allowing for a more precise drying endpoint. This sensor-controlled approach ensures consistent coir pith quality by preventing scorching or under-drying, optimizes energy use through controlled heating, and reduces the risk of mold growth. The result is a faster and more efficient drying process that yields a high-quality, stable product.


    In conclusion, our study proposes a comprehensive approach to coco peat processing aimed at enhancing salt removal efficiency while ensuring environmental sustainability. By optimizing pre-processing techniques, refining washing and rinsing protocols, and improving dewatering efficiency, we have developed a systematic method to address salt accumulation challenges. Through careful process monitoring and economic analysis, we have identified cost-effective strategies for salt removal while minimizing environmental impact. Our findings contribute to the advancement of sustainable practices in the coco peat industry, offering a practical solution for enhancing the quality and usability of coco peat in agriculture and horticulture. Moving forward, continued research and implementation of these optimized processing methods will play a crucial role in promoting sustainable agriculture and preserving our natural resources.


  1. Ravindran, B., Ravindran, K., Sivakumar, R., & Balachandar, D. (2010). Salt accumulation in coir pith and consequent changes in pH and electrical conductivity. International Journal of Environmental Science and Technology, 7(3), 579-582.

  2. Rajkumar, P., Veeramuthu, A., & Natarajan, N. (2012). Salt stress mitigation by calcium chloride in germinating seeds of black gram (Vigna mungo L.). World Journal of Agricultural Sciences, 8(3), 249-252.

  3. Kumara, M. S., Sivakumar, R., & Sudha, S. (2018). Salt removal from coir pith by washing and its reuse for horticultural crops. Journal of Environmental Biology, 39(6), 1237-1243.

  4. Ravindran, B., Sivakumar, R., & Kannan, S. (2015). Impact of multiple flushes with fresh water on salt reduction in coir pith. International Journal of Environmental Science and Technology, 12(6), 1965-


  5. Rajkumar, P., Ramasubramanian, V., Suresh, E., & Sivasubramanian, V. (2018). Evaluation of different methods for extraction of salt from coir pith. Journal of Pharmacognosy and Phytochemistry, 7(4), 1747-1750.

  6. Kumara, M. S., Sivakumar, R., & Sudha, S. (2019). Salt-tolerant bacteria enhanced salt removal from coir pith. Journal of Environmental Biology, 40(1), 83-88.

  7. Halamba, S. and Kuack, D. (2021) Using Coir as a Growing Substrate. Hort Americas, 1-10.

  8. https://hortamericas.com/uncategorized/using-coir-as- growing-substrate/

  9. Poulter, R. (2014) Quantifying Differences between Treated and Untreated Coir Substrate. Acta Horticulturae, 1018, 557-564.


  10. Vidhana, A. L. P. and Somasiri, L. L. W. 1997. Use of Coir Dust on the Productivity of Coconut on Sandy Soils. Cocos 12, 5471.

  11. Elavalagan VA. Effect of Lignite Fly Ash and Composted Coir Pith on Cultivable Soils. Biosci. Biotech. Res. Asia 2014;11(1):109-113

  12. Raghuvaran A, Ravindranath AD. Efficacy of biological coirpith for cultivation of medicinalplant. J.

    Sci.Industrial Res 2010;69:554-559

  13. Savithri G, Hamed Khan S. Industrial application of coir waste. Plant physiol 2004;23(8):13-30.

  14. TNAU- Tamil Nadu agriculture university, Coimbatore, agritech portal.

  15. Prasanta K. Ghosh, U. S. Sarma, Anita Das Ravindranath, S. Radhakrishnan, and Prasenjeet Ghosh (2007) A Novel Method for Accelerated Composting of Coir Pith Energy Fuels, 21 (2), 822 -827

  16. Abesh Reghuvaran and Anita Das Ravindranath (2011) Coir pith as growth medium for Azotobacter vinelandii and Azospirrilum brazilense,CORD 27 (2) 63-73.

  17. Anita Das Ravindranath, U.S. Sarma and Radhakrishnan S (2007). Biotechnology in Coir – past, present & future. India International Coir Fair 2007 Souvenir (91).

  18. Anita Das Ravindranath, U.S.Sarma and Radhakrishnan.S, (2006) Coir-A renewable Agro waste for horticulture. Proceedings of National Seminar on Plant Physiology, organized by KAU, Thrissur.

  19. Anita Das Ravindranath (2006) Technology for extraction of lignosulphonate from coir pith Paper presented at the Coir Transfer of Technology Workshop, 6-7 January, 2006 at CCRI, Kalavoor.

  20. Microbial degradation of coir pith using natural nitrogen supplements, Ph.D Thesis, Dr.S.Radhakrishnan (2009).

  21. Proceedings of the Seminar on Utilization of Coir Pith in Agriculture, 20th November 1991