Sewage treatment equipment

Oil determination:

When the coagulant aluminum sulfate is added to the water sample, the oil particles dispersed in the water will be condensed by the formed aluminum hydroxide. With the precipitation of aluminum hydroxide, the trace amount of oil in the water will also gather and precipitate, after acidification, the precipitation can be dissolved, and then through the extraction of organic solvents, the oil separated into the organic solvent, the organic solvent evaporates to dry, the residual is the oil in the water, and the oil content in the water can be obtained by weighing. This method uses carbon tetrachloride (CCL4) as an organic solvent, which can avoid combustion or explosion accidents during the evaporation process.

Positive penetration:

Positive osmosis - Searching for new technologies for water treatment and desalination

As a potential new technology for water purification and desalination, positive osmosis is being studied in the world from multiple angles and in deep level. Forward osmosis and reverse osmosis are a pair of reciprocal methods. In 1976, there was the original attempt of liquid-liquid system in foreign countries, and in 1992, the forward osmosis (non-pressurized) adsorption osmosis method for desalting of liquid-solid system was invented in China (CN92110710.2). It was not until about 10 years later that it followed the international trend again and began the standard model of imitation and replication, which was reviewed in 2008.

New ways to edit and broadcast

With the rapid development of science and technology, pressure driven reverse osmosis membrane separation technology (RO) has made great innovations and improvements in membrane, membrane assembly, equipment and process, but people are also increasingly aware of the limitations of RO technology in the field of energy saving and environmental protection, and in terms of desalination, RO technology can be considered to be close to the peak of development. Therefore, foreign countries have carried out the "forward osmotic membrane separation technology (FO)" related research, and achieved certain results, in the desalination, sewage treatment, food processing, medicine and other fields have been applied, especially "pressure delayed osmosis (FRO) seawater power generation", is a very promising clean renewable energy development technology J. However, there is little attention to forward osmosis membrane separation technology in China, and there are not many related studies and papers. Although, in the 1990s, China had a creative invention of "non-pressurized adsorption osmotic desalination" (CN92110710.2).

Forward osmosis separation technology has been used for a long time. Salt has long been used for long-term food storage because most bacteria, molds and pathogens die of dehydration or are temporarily inactive due to osmosis in high salt environments. Nowadays, people have begun to use forward osmosis membrane separation technology for seawater desalination, industrial wastewater treatment, garbage osmotic solution treatment and other research; The food industry uses forward osmosis membrane separation in the laboratory to concentrate beverages; Life support systems during emergency rescue use forward osmosis membrane separation technology to produce fresh water. With the development of materials science, forward osmosis technology has been applied to drug controlled release in human body.

osmoadsorption

(1990s)

Non-pressurized adsorption osmosis seawater desalination method, or known as "forward osmosis method", so that water through the porous membrane forward osmosis into a super absorbent or salt concentration even more than seawater solution or solid, do not require external pressure, but the special salt in the solution "extract" is easy to evaporate, do not need to add too much heat (heating energy and reverse osmosis pressure energy ratio?) . Divided into solid salt, liquid salt direction. Solid salt desorption requires less energy.

Desalination technology: non-pressurized adsorption infiltration desalination method (CN92110710.2) 1992: The invention of Deng Yu in the 1990s, American Chemical Abstracts included.

The other two methods have innovations and improvements in thin film structure:

nanofilm

A small hole using carbon nanotubes to make thin films, the carbon nanotube film of single-walled carbon nanotubes and multi-walled carbon nanotubes has a strength-to-weight ratio, an elastic modulus-weight ratio and a stiffness increase of 1.6 times, 1.4 times and 2.4 times, respectively, compared with the carbon nanotube composed of single-walled carbon nanotubes or multi-walled carbon nanotubes.

Protein membrane

The pores of the film are made of proteins that guide water molecules through the membranes of living cells.

Algae treatment edited broadcast

Due to the increase of organic matter in the lake, algae will proliferate in sufficient oxygen-rich environment under suitable temperature and other conditions. Has become a major problem of water treatment

Algal property

Algae is a single-celled organism, which is easy to suspend on the surface of the lake because of its strong survival ability and strong branchability.