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Landfill leachate RO concentrated solution evaporation, concentration and staged crystallization method

A landfill leachate, evaporation and concentration technology, which is applied in the full treatment of landfill leachate RO concentrate and the field of resource utilization, to achieve the effects of stable operation, wide process applicability, and simplicity and economy

Active Publication Date: 2020-04-24
FUZHOU UNIV
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Problems solved by technology

However, the technology based on this idea is still rare at present. Therefore, it is necessary to further develop a simple, economical and adaptable leachate RO concentrate full treatment and resource utilization method based on this idea.

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  • Landfill leachate RO concentrated solution evaporation, concentration and staged crystallization method

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Embodiment

[0033] The present invention will be further described below by taking the evaporative concentration segmented crystallization of RO concentrate in a leachate treatment project of a household waste incineration power plant as an example.

[0034] The scale of the leachate treatment project of the domestic waste incineration power plant is 500 tons per day, and the combined process of UASB+secondary A / O+UF (MBR)+NF+RO is adopted. The treatment project produces about 100 tons of RO concentrate per day, and its water quality is as follows: pH is 7.6~8.3, TOC is between 45~94mg / L, conductivity is between 56.8~74.6mS / cm, Ca 2+ and Mg 2+ The concentration ranges are 103~394mg / L and 90~396mg / L respectively. The main water quality of the RO concentrate after deep softening and organic oxidation pretreatment is as follows: pH is 4~6, TOC is between 13~18mg / L, TDS is between 34000~41000mg / L, Na + Between 8000~10000mg / L, K + Between 6200~7200mg / L, Cl - Between 17000~21000mg / L, Ca 2+...

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Abstract

The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a landfill leachate RO concentrated solution evaporation, concentration and staged crystallization method. The method comprises steps of: evaporating and concentrating the RO concentrated solution subjected to deep softening and organic matter purification pretreatment through an MVR evaporator, carrying out evaporative crystallization by using a forced circulation MVR evaporator, washing and drying the crystal to obtain industrial-grade sodium chloride, further cooling and crystallizing the crystallization mother liquor, and washing and drying the obtained crystal to obtain industrial-grade potassium chloride. According to the method, the MVR evaporator, the forced circulation MVR evaporator and the cooling crystallizer are adopted to carry out evaporation, concentration, staged crystallization, washing and purification on a pretreated RO concentrated solution; sodium chloride andpotassium chloride industrial salt products are obtained in a staged mode by respectively controlling process conditions such as evaporation, concentration, staged crystallization and the like, and condensed water is recycled as circulating cooling water, so that total treatment and resource utilization of RO concentrated solution are achieved. The method is effective, economical, simple, wide inadaptability and stable in operation.

Description

technical field [0001] The invention belongs to the technical field of landfill leachate treatment, and in particular relates to a full-volume treatment of landfill leachate RO concentrate and a resource utilization method. Background technique [0002] MBR+NF is the mainstream process for treating landfill leachate. In engineering, for the reuse of reclaimed water or to ensure that the total nitrogen reaches the standard, the NF effluent rich in monovalent ions (NF can intercept most of the organic matter and divalent ions in the MBR effluent ) is further treated with RO units, thus producing RO concentrates that account for 20% to 30% of the leachate stock solution. It can be seen that the RO concentrate mainly contains monovalent ion inorganic salts, such as Na + 、K + and Cl - , and a small amount of organic matter and divalent ions (Ca 2+ , Mg 2+ and SO 4 2- ), generally, TDS is 25000-65000mg / L, conductivity is 35-110mS / cm, pH is 6.5-8, COD and TOC are 100-450mg / L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/04C01D3/14C01D3/06C02F103/06C02F101/12
CPCC02F9/00C02F1/048C01D3/14C01D3/06C02F2103/06C02F1/22C02F1/38C02F2101/12
Inventor 许玉东吴琦
Owner FUZHOU UNIV
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