Printing and dyeing wastewater heat energy recovery and anti-dirty treatment method

Abstract

The invention belongs to the technical field of wastewater heat energy recovery, and relates to a printing and dyeing wastewater heat energy recovery and anti-dirty treatment method. The method comprises the steps of starting a control switch in a switch box so that a recovery device begins to run and work; starting a control system, at which time high-temperature wastewater from a printing and dyeing production workshop is introduced to the recovery device through a centrifugal pump, open a faucet so that running water enters into the recovery device through a clean water inlet, implementing water-water exchange between cold clean water and heat wastewater through a heat exchange host machine, transmitting the heat wastewater to a regulating tank through a sewage outlet after reducing temperature and implementing acid-base equilibrium regulation until the sewage is neutral, and settling; discharging the sewage to a next wastewater treatment project through a discharge port after being settled for three times. The method is simple in process, simple and convenient to operate, rational in device structure, reliable in principle, low in manufacturing cost, good in recovery effect, high in recovery efficiency, and environmentally-friendly.

Description

Technical field: [0001] The invention belongs to the technical field of waste water heat recovery, and relates to a heat recovery and anti-pollution treatment method for printing and dyeing waste water, which is suitable for wastewater discharge and supplementary production systems in textile and printing and dyeing industries, and converts heat energy in waste water into process water through water-water exchange In the process, the temperature of waste water can be reduced, the heat can be recycled and the environment can be protected. Background technique: [0002] At present, in the production process of chemical, textile, printing and dyeing enterprises, a large amount of high-temperature wastewater with a temperature of about 65°C will be produced. These wastewaters contain pollutants and also contain a lot of heat, especially textile printing and dyeing wastewater. , high chroma, and high pollution. Due to the high temperature, some bacteria cannot survive in high-tem...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of chemical, textile, printing and dyeing enterprises, a large amount of high-temperature wastewater with a temperature of about 65°C will be produced. These wastewaters contain pollutants and also contain a lot of heat, especially textile printing and dyeing wastewater. , high chroma, and high pollution. Due to the high temperature, some bacteria cannot survive in high-temperature wastewater, and biochemical treatment methods are not easy to adopt. Therefore, only physical and chemical methods can be used for treatment. How to recycle these as much as possible? Heat energy in wastewater is an important task for energy saving and consumption reduction in the textile industry. Although many companies have made great efforts in the treatment of printing and dyeing wastewater, most of them focus on end-of-life treatment. End-of-life treatment refers to the centralized treatment of wastewater generated in various production processes , which not only increases the amount of waste water to be treated, increases the cost of treatment, but also increases the difficulty of treatment. More importantly, all the high temperature is concentrated at the end for treatment, and the heat loss in the water will be very serious, which is very unfavorable for recycling; in addition , the terminal treatment needs to cool the high-temperature printing and dyeing wastewater generated in the production process first, and then needs to be heated again when it is reused. In this process, the waste of heat energy is serious, causing unnecessary loss of energy, and will pollute the environment and affect ecological balance

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