WANG Pengcheng, HU Pengjie, ZHONG Daoxu, CHEN Yahua, WU Longhua. Rapid disposal technology for fresh biomass of harvested Cd/Zn hyperaccumulator Sedum plumbizincicola[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5307-5312. doi: 10.12030/j.cjee.201610116
Citation: WANG Pengcheng, HU Pengjie, ZHONG Daoxu, CHEN Yahua, WU Longhua. Rapid disposal technology for fresh biomass of harvested Cd/Zn hyperaccumulator Sedum plumbizincicola[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5307-5312. doi: 10.12030/j.cjee.201610116

Rapid disposal technology for fresh biomass of harvested Cd/Zn hyperaccumulator Sedum plumbizincicola

  • Received Date: 12/01/2017
    Accepted Date: 19/10/2016
    Available Online: 26/08/2017
    Fund Project:
  • Sedum plumbizincicola, a kind of hyperaccumulators, is promising to be used in the phytoremediation of cadmium-contaminated soils. However, the volume reduction disposal of fresh biomass harvested after remediation is one of the urgent technical problems to be solved. Fresh biomass of S. plumbizincicola was cut and crushed to get residue and sap. Then the residue was dried quickly and the sap was treated using physical and chemical methods to make sure that the effluent Cd concentration was under corresponding standard limits. The effect of different flocculant, pH value and heavy metal capture agent on the removal rate of Cd from sap was investigated, and the optimal treatment method was obtained. The results show that after being cut and crushed, the dry time of fresh biomass decreased from half month to (2 to 6) days. By adding 0.3% poly aluminium chloride (PAC), 0.1% NaOH, 0.05% trimercaptotriazine (TMT), the Cd concentration of effluent decreased from 1.98 mg L-1 to 0.066 mg·L-1, lower than 0.1 mg·L-1, the limited value of the National Wastewater Comprehensive Discharge Standard(GB 8978-1996).
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Rapid disposal technology for fresh biomass of harvested Cd/Zn hyperaccumulator Sedum plumbizincicola

Fund Project:

Abstract: Sedum plumbizincicola, a kind of hyperaccumulators, is promising to be used in the phytoremediation of cadmium-contaminated soils. However, the volume reduction disposal of fresh biomass harvested after remediation is one of the urgent technical problems to be solved. Fresh biomass of S. plumbizincicola was cut and crushed to get residue and sap. Then the residue was dried quickly and the sap was treated using physical and chemical methods to make sure that the effluent Cd concentration was under corresponding standard limits. The effect of different flocculant, pH value and heavy metal capture agent on the removal rate of Cd from sap was investigated, and the optimal treatment method was obtained. The results show that after being cut and crushed, the dry time of fresh biomass decreased from half month to (2 to 6) days. By adding 0.3% poly aluminium chloride (PAC), 0.1% NaOH, 0.05% trimercaptotriazine (TMT), the Cd concentration of effluent decreased from 1.98 mg L-1 to 0.066 mg·L-1, lower than 0.1 mg·L-1, the limited value of the National Wastewater Comprehensive Discharge Standard(GB 8978-1996).

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