Improvement of hydraulic extraction methods for moist sapropel

Authors: Dementjev V. A.

The analysis of stable extraction methods for moist sapropel at minimized environmental impact is presented. The mathematical model to determine safe volume and optimal method for extraction of sapropel with natural moisture content from under an overburden layer and without mixing with water is proposed. The dependence of the optimized safe volume of extraction on the subsidence depth of the overburden layer and structural shear resistance of sapropel is found for three different methods of sapropel extraction without its mixing with water: 1—cone of depression; 2—trench of depression; 3—scraper trench. The proposed submersible cell-type suction head with integral eccentric-driven screw pump and scraper bucket is capable to travel in sapropel beds at the preset depth, and to ensure stable extraction of sapropel with natural moisture content within a wide range of shear strengths for sapropel of various grades and various rheology. It is concluded that it is required to optimize extraction techniques for sapropel with natural moisture content to eliminate mixing of sapropel with water and to ensure thereby the minimized environmental impact on a water body and adjacent territory.

Keywords: sapropel, organic farming, organic fertilizer, natural moisture content, suction-tube dredge, suction head, shear resistance, cone of depression, trench of depression, ecology, safe advance velocity.
For citation:

Dementjev V. A. Improvement of hydraulic extraction methods for moist sapropel. MIAB.MiningInf.Anal.Bull.2021;(7):42-52.[InRuss].DOI:10.25018/0236_1493_2021_7_0_42.


Issue number: 7
Year: 2021
Page number: 42-52
ISBN: 0236-1493
UDK: 553.973:622.271.6
DOI: 10.25018/0236_1493_2021_7_0_42
Article receipt date: 05.04.2021
Date of review receipt: 23.04.2021
Date of the editorial board′s decision on the article′s publishing: 10.06.2021
About authors:

V.A. Dementjev, Cand. Sci. (Eng.), Member of the Board, EHT Engineering Ltd., LV-2101, Riga, Latvia, e-mail:


For contacts:

1. Annual Report 2018. CORAF.P.18. available at: (accessed 03.2020).

2. Development Challenges, South-South Solutions. E-newsletter of the United Nations Office for South-South Cooperation in UNDP. March 2014. 4)”Pocket-Friendly” Solution to Help Farmers Go Organic. available at: (accessed 03.2014).

3. Nitiema L. W., Traore F., Nebie K., Soalla R. W., Ouedraogo T. Y., Sanon B. S., Ouattara K. Effet du fertilisant minéral NPK et du biofertilisant BioDeposit® sur les insectes ravageurs et les maladies du niébé (Vigna unguiculata L. Walp.) au centre-ouest du Burkina Faso. available at: (accessed04.11.2019).

4. Commission Regulation (EC) No 889/2008. 2008R0889-EN-07.05.2016-011.001-001-1. P.88. available at: (accessed07.05.2016).

5. Dementjev V. A. Sapropel as a source of alternative energy and natural organic fertilizers. MIAB. Mining Inf. Anal. Bull. 2014, no. 6, pp. 67—70.

6. Snakin V. V., Doronin A. V., Freybergs G., Shcherbitskis I., Vlasova I. V., Chudovskaya I. V. Atmospheric methane: Dynamics and sources. Zhizn' Zemli. 2017, vol. 39, no. 4, pp. 365— 380.

7. Gaponenko G. E., Shul'kin L. L., Kriga A. S. Lake sapropel extraction ecology. Sapropel and conversion products. Materialy mezhdunarodnoy nauchno-prakticheskoy konferentsii [Materials of international scientific and practical conference], Omsk, OMGAU, 2008, pp. 59—60.

8. Aref'ev N. N. Method of engineering design of hydraulic transport for sapropel with natural moisture content. MIAB. Mining Inf. Anal. Bull. 2006. Special edition 4, pp. 201—204.

9. Antoniadi D. G., Gaponenko A. M., Vartumyan G. T., Strel'tsova Yu. G. Sovremennye tekhnologii intensifikatsii dobychi vysokovyazkoy nefti i otsenka effektivnosti ikh primeneniya: uchebnoe posobie [Modern stimulation technologies in high-viscosity oil recovery and application efficiencies: Educational aid], Moscow, Vologda, Infra-Inzheneriya, 2019, 80 p.

10. Yaltanets I. M., Dementjev V. A. Sapropel industry in Russia: Prospects and technologies. Gidrotekhnicheskoe stroitel'stvo. 2020, no. 10, pp. 39—45.

11. Gaevskiy K. K., Shtin S. M. Freshwater bodies: Dredging and position in national project Ecology. Hydrotechnika. 2019, no. 3(56), pp. 32—34.

12. Dementjev V. A. Patent RU2745146S1, 22.03.2021. [In Russ].

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.