Chemically versus thermally processed brown shrimp shells or Chinese mitten crab as a source of chitin, nutrients or salts and as microbial stimulant in soilless strawberry cultivation
article
Brown shrimp (Crangon crangon) shells and Chinese mitten crab (Eriocheir sinensis) were chemically demineralized and deproteinized (denoted as M1 to M4 for the shrimp shells and M5 to M7 for the Chinese mitten crab), and shrimp shells were torrefied at 200 to 300 °C (denoted as R200, R255, R300), and were compared with a commer cially available chitin source (denoted as reference chitin). Based on their chemical characteristics, a selection of chi tin sources was tested for their N mineralization capacity. The N release was high for the chemically treated shrimp shells and Chinese mitten crab, but not for the torrefied shrimp shells with or without acid treatment, indicating that treatment at 200 °C or higher resulted in low N availability. Interaction with nutrients was tested in a leaching experiment with limed peat for three thermally and two chem ically processed shrimp shells and the reference chitin source. The K concentrations in the leachate for the chemi cally treated shrimp shells and the reference chitin were lower than for limed peat during fertigation. Irreversible K retention was observed for one source of chemically treated shrimp shells, and the reference chitin. The thermally treated shrimp shells had a significantly higher net release of P, Na and Cl than the treatment without chitin source. Chemicals / CAS calcium carbonate, 13397-26-7, 13701-58-1, 14791-73-2, 471-34-1; chitin, 1398-61-4; chloride, 16887-00-6; nitrogen, 7727-37-9; potassium, 7440-09-7; sodium, 7440-23-5; sodium chloride, 7647-14-5, 23724-87-0, 49658-21-1; Chitin; Salts.
Topics
TNO Identifier
967894
ISSN
00489697
Source
Science of the Total Environment, 771, pp. 1-13.
Publisher
Elsevier B.V.
Article nr.
145263
Pages
1-13