Reclaimed water reuse and ultra-low emission process of waste paper papermaking tail water
A waste paper papermaking and tail water technology, applied in water/sewage treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., to reduce COD and increase reuse rate
Pending Publication Date: 2022-05-13
CHINA CEC ENG
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Problems solved by technology
Traditional waste paper and papermaking sewage is treated by the sewage system and discharged up to the standard or a reclaimed water recycling system is established to reuse part of the water body. However, few waste paper and papermaking enterprises actually carry out zero / ultra-low discharge projects for sewage
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Embodiment 1
[0030] A process for reclaimed water reuse and ultra-low discharge of waste paper and papermaking tail water. When the hardness of incoming water from the sewage treatment system is less than 500mg / L, the specific process steps and dosage of chemicals are as follows:
[0031] (1) Pretreatment of the first section: the facilities include the homogenization pool of the first section, the clarifier of the first section and the fast filter of the first section.
[0032] The papermaking tail water discharged from the sewage treatment system first flows to the homogeneous tank of the first section by itself to realize the homogeneity and quantity of the tail water; the effluent from the homogeneous tank is sent to the clarification tank of the first section, and the concentration is 1‰, 0.12‰, 0.1 ‰, 0.001‰ and 0.15‰ of sodium hydroxide, sodium carbonate, PAFC, APAM and sulfuric acid, effectively remove water hardness, alkalinity and SS. The effluent from the clarification tank ente...
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Abstract
The invention discloses a reclaimed water reuse and ultra-low emission process of waste paper papermaking tail water, and relates to the field of waste paper papermaking tail water reuse treatment, a process combination of pretreatment, a double-membrane method and MVR evaporative crystallization is adopted, and the process comprises four parts of waste paper papermaking tail water pretreatment, double-membrane treatment, MVR evaporative crystallization treatment and sludge treatment. The indexes such as COD (Chemical Oxygen Demand), conductivity, TDS (Total Dissolved Solids) / total salt content, turbidity, hardness and the like of the waste paper papermaking tail water are greatly reduced, reclaimed water generated in the treatment process can be completely recycled to each production workshop, the waste paper papermaking tail water is completely recycled without being discharged, and the repeated utilization rate of water resources is increased.
Description
technical field [0001] The invention belongs to the technical field of papermaking sewage treatment, and relates to a process for reclaiming reclaimed water and ultra-low discharge of waste paper and papermaking tail water. Background technique [0002] As of 2020, China's waste paper recycling rate and utilization rate have increased to 46.5% and 54.9% respectively. The annual output of waste paper pulp is close to 54 million tons, and its consumption accounts for 72.9% of China's domestic pulp consumption. Waste paper is used as secondary fiber for papermaking enterprises to produce recycled paper. Its pulping energy consumption, chemical consumption and sewage pollution load are far lower than that of virgin fiber wood pulp. Compared with traditional plant fiber, it can save more than 50% of water and energy. It not only brings good economic benefits, but also further promotes environmental protection, comprehensive utilization of resources and sustainable economic develo...
Claims
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IPC IPC(8): C02F9/14C02F103/28
CPCC02F9/00C02F2103/28C02F5/00C02F1/441C02F1/444C02F1/66C02F1/78C02F2003/003C02F2001/425C02F1/041C02F2001/5218C02F1/5281C02F1/5236C02F1/56C02F1/001C02F11/148
Inventor 葛强雷平罗灿欧阳永强朱丛韵张成峰刘桂芳
Owner CHINA CEC ENG