Natural balance ultrahigh concentration multiple and zero emission control method for circulating cooling water system

Abstract

The invention discloses a natural balance ultrahigh concentration multiple and zero emission control method for a circulating water system. The method comprises the steps that at the initial stage of operation, efficient scale and corrosion inhibition functional chemicals are continuously added into a circulating cooling water pond, the concentration of the efficient scale and corrosion inhibition functional chemicals is maintained to be 100-200 mg / L, after circulation is conducted for 20-30 days, the concentration is controlled to be maintained to be 50-100 mg / L, the chemicals are circulated along with circulating water to reach a heat exchanger, and part of water returns to the circulating cooling water pond after being filtered; when the sum of the calcium hardness and the total alkalinity in the circulating water exceeds 1200 mg / L, high-efficiency micro-foam evaporation pre-precipitation functional chemicals are added into the circulating cooling water tank, the adding concentration is 10-100 mg / L, and micro-foam evaporation pre-precipitation softening treatment is carried out; when the turbidity of the circulating water is greater than or equal to (4-10) NTU or the total iron is greater than or equal to (0.5-1) mg / L, adding an enhanced filtration functional chemical with the adding concentration of 0.5-10 mg / L into a circulating cooling water tank, performing enhanced filtration, directly recycling filtered water to a circulating water system, discharging dirt along with backwashing water, performing water-slag separation on the backwashing water, returning the separated water to the circulating water system, and discharging separated filter residues.

Description

technical field [0001] The invention belongs to the technical field of circulating cooling water treatment, and in particular relates to a natural balance ultra-high concentration ratio and zero emission control method of a circulating cooling water system. Background technique [0002] With the scarcity of potable water resources and increasingly strict environmental regulations, more and more regions and enterprises have put forward strict restrictions on water consumption and sewage discharge, saving water and reducing emissions, utilizing medium (waste) water resources, and realizing green development. It has become one of the important strategies for the sustainable development of more and more enterprises. [0003] Over the years, industrial cooling water treatment technology has been making continuous iterative progress in terms of increasing the concentration ratio, developing functional chemicals and operating processes suitable for high concentration ratio water tr...

AI Technical Summary

Problems solved by technology

In order to ensure a good water treatment effect, the technical level of functional chemicals developed in different eras determines that the concentration ratio of the cooling water system presents different levels, from 2-3 times to 4-5 times. In recent years, some industries The concentration ratio of the industrial cooling water system in Hebei and other regions has been increased to nearly 10 times, realizing near-zero discharge operation, but there are still two major problems: "need to add acid" and "cannot discharge zero".

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