Comprehensive processing and utilization method of candied date processing wastewater

Abstract

The invention relates to a comprehensive processing and utilization method of candied date processing wastewater. According to the invention, candied date processing wastewater is subjected to a quality-differentiated processing method. High-sugar-content wastewater is subjected to multi-effect evaporation, such that sugar is recovered. Therefore, sewage processing load is greatly reduced, and considerable economic benefit can be produced with the recovered sugar. Date washing water, ground cleaning sewage, and other domestic sewage are gathered and processed, at the same time, coal-fired boiler flue gas desulfurization is performed. Bio-desulfurization is carried out with organic pollutants in the sewage as a nutrient source, sewage is also processed to a certain extent, and water temperature is increased, such that subsequent biochemical treatments are facilitated. Biochemical treatment outlet water is subjected to biochar deep processing, and is subjected to microfiltration and RO (reverse osmosis) double-membrane processing, such that outlet water salinity is reduced, and boiler softened water requirement is reached. Therefore, date processing wastewater discharge amount can be further reduced, and consumption and discharge of softening acid and alkali for traditional boiler water can be further reduced.

Description

technical field [0001] The invention relates to a method for comprehensive treatment and resource utilization of jujube (candied fruit) processing wastewater, in particular to a treatment method for comprehensive treatment of jujube processing wastewater, honey recovery, coal-fired boiler desulfurization and jujube processing wastewater. Background technique [0002] Jujube is one of the oldest tree species in the Yellow River Basin, with a history of thousands of years of cultivation. Hebei, Henan, Shanxi, Shaanxi, Xinjiang and other places are the main jujube producing areas in my country. Candied dates are a traditional and delicious leisure food with rich nutritional value. They have a huge market and a good reputation at home and abroad. Candied dates processing can increase the added value of agricultural products and drive the local economy. However, candied date processing is also a relatively polluting industry. The high-concentration wastewater produced by candie...

AI Technical Summary

Problems solved by technology

[0008] 1. Wet flue gas desulfurization is to convert SO 2 Transferred to solid-phase calcium sulfate, and the utilization value of calcium sulfate is not high, causing difficulties in reuse or disposal;

[0009] 2. The most serious problem of wet desulfurization using limestone as desulfurizer is the scaling and blockage of gypsum, which is the main reason for the shutdown of the desulfurization absorber;

[0010] 3. Scaling and deposition in the desulfurization system will cause pipeline blockage, wear, corrosion and increase in system resistance, increasing investment and operating costs;

[0011] 4. Factors affecting the reliability of the FGD system mainly include flue gas conditions, absorbent characteristics, boiler operating conditions and other factors, as well as the operator's level of understanding and mastery of FGD operations. Due to the complicated process of wet flue gas desulfurization technology, Requires high maintenance costs