How to treat paper waste water with ultrafiltration membrane treatment?

How to treat paper waste water with ultrafiltration membrane treatment？

There is a lot of water in the papermaking process. It takes about 300-500 M3 to produce a ton of paper. In paper waste water, not only there are many paper raw materials (about 20% of the waste water lost), but also a lot of chemicals and other impurities. Therefore, if left untreated, paper waste water will be discharged at will, which will cause great harm to the water body. Characteristics of paper waste water:

1. Waste liquid produced by boiled wood pulp (or grass pulp), also known as black liquid.

2. Wastewater discharged from the pulper and the separator is called beating wastewater.

3. The directly used paper machine sewage is called white water.

The main pollution situations are as follows:

1. Suspended solids include settled suspended solids and non-depositioned suspended solids, mainly fibers and fine fibers (i.e., broken fibrous fragments and other cells).

2. Biodegradable organic compounds include low molecular weight of nitrosified cellulose, methanol, acetic acid, methyl acid, carbohydrate, etc.

3, the difficult to degrade biomass mainly comes from the fiber raw material sits badgeand and macro-molecular carbohydrate.

4. Rosinic and unsaturated fatty acids in toxic black liquor.

5. The pH of acid-base pulping wastewater is 9-10, and the pH of acid-base pulping wastewater is 1.2-2.0.

6. The lignin residue in chroma pulping wastewater is colored.

Membrane bioreactor (MBFB) is a solid liquid separation technology based on biofluidized bed, with powdery activated carbon (PAC) as the carrier, and combined with the membrane bioreactor (MBR), the activated carbon, microorganisms physical adsorption combined. Degradation and membrane separation. Powdered activated carbon also provides a special surface for microbial reproduction, and the porous surface of powdered activated carbon absorbs a large number of microbial microbiomes.

Special microbial flora with the target pollutant as the metabolic substrate, and powdered activated carbon has a strong adsorption capacity to dissolved oxygen in water. Under the condition of high dissolved oxygen, the microorganism oxidizes and decomposes the small molecule organic matter enriched on the activated carbon surface, and then uses the ceramic membrane separation system to separate the suspended particles such as water and powderads of activated carbon. Flow filtration further purifys wastewater to meet re-use standards for recycled water.