Wastewater Reduction - Hazardous Wastewater Reduction

The main process:

1. Classify and collect hazardous waste according to different properties, especially in the production process, to avoid direct mixed discharge;
2. For acid-base waste liquids, part of them can be directly utilized, especially in pH adjustment; for acid-base waste liquids without impurities, acid-base recovery can be carried out;
3. Waste liquids containing heavy metals can be dewatered and reduced in volume, reducing hazardous waste. The most common treatment method is to use a skid-mounted evaporation system to directly perform dewatering treatment directly, thereby achieving the purpose of reducing hazardous waste;
4. For some highly concentrated organic waste liquids, our company has developed a quantitative reduction system for organic matter, which is mainly for secondary consumption based on the properties of the organic matter to achieve the purpose of volume reduction.

Reducing hazardous waste has an obvious effect, and the economic benefits are significant. Generally, the investment cost can be recovered in 120-180 days, and the risk of safe production is indirectly reduced.

Our Solutions:

The principle of alkali reduction treatment is based on an acid-base neutralization reaction. Alkaline substances in wastewater are usually produced by hydroxides, carbonates, etc., which make the water alkaline. By adding acidic substances, such as sulfuric acid, hydrochloric acid, etc., to the wastewater, the alkaline substances in the wastewater can react with the acidic substances to generate salt and water. In this way, the alkalinity of the wastewater is reduced, and the water quality is purified.
There are many methods for alkali reduction treatment, but the common ones include acid-base neutralization, gas neutralization, and precipitation.
After passing through the membrane treatment system, the concentrated liquid (10%) is used for pollution reduction, and the antimony-removing clear liquid (90%) of the concentrated liquid is used for reuse.

 

Application: chemical industry, pharmaceutical, electroplating, food

Our implementation:

In the textile industry, the wastewater produced by the alkali reduction process of fabrics has the following characteristics:

High COD 20000-30000mg/L

Low B/C ratio <0.1 (difficult to biodegrade)

High alkali concentration 1-50g/L (different processes, different concentrations)

Conductivity 150-170mS/cm

High antimony concentration 700-1000μg/L (emission standard is 100μg/L)

A textile factory treats 200m³ of alkali-reduced wastewater per day as an example to achieve the following treatment effects:

Clear liquid alkali reuse: The clear liquid of the membrane treatment system is reused in the work section, and the alkali concentration is 10g/L;

The concentration of concentrated liquid pollutants was reduced from 27000mg/L to 7000mg/L, and the COD degradation rate was 74.1%;

Antimony removal from concentrated liquid reduced from 761 μg/L to 34.2 μg/L (emission standard is 100 μg/L)

The cost of hazardous waste reduction is 30-40% lower than conventional reduction.