Resource and Environmental Protection

Advanced Treatment to Meet Standards

If there is a reclaimed water reuse process, the low concentrated organic matter, ammonia nitrogen, fluorine and other aspects of the reclaimed water are deeply removed to meet the reuse water standard. (Low brine such as evaporation condensate is superior to membrane technology, and the water production rate is higher.)

Discharge standards are being raised. Existing processes cannot meet or stably meet the standards, and this can be used as an advanced treatment process (located at the end of the treatment process, suitable for situations with fewer pollutants, low concentrations, and simple water quality).

- Some characteristic pollutants can be recycled as materials for the front-end production line (high content and purity). The portion that cannot be recycled can be disposed of centrally.

- Desorbent recovery (ED/NF separation of organic matter and salts).

Reclaimed Water Reuse System Upgrade

For coal chemical/dyeing enterprises, where the existing reclaimed water reuse process has insufficient reuse rate or frequent membrane fouling, this can be used as a strengthening device to reduce the membrane feed load and improve the water yield.

New DEEP Reclaimed Water Reuse Process

For coal chemical/dyeing enterprises, when building a new reclaimed water reuse process, DEEP reclaimed water reuse technology can be directly adopted, resulting in higher water yield and longer membrane service life.

- Bipolar membranes directly produce acid and alkali from high-salinity water, omitting the solid waste identification step and achieving "true zero discharge".

- Desorbent recovery (ED/NF, etc., separates organic matter and salts).

Solar cell panel production mainly includes silicon wafer inspection, texturing, acid washing, phosphorus diffusion, etching, anti-reflective film deposition, printing and sintering, and packaging. A large amount of production wastewater is mainly generated in the texturing, acid washing, and etching processes. Fluorine-containing industrial wastewater is usually treated by adding calcium salts or lime to form a difficult-to-dissolve calcium fluoride precipitate. The F-ion pollution in solar cell production wastewater is also mostly removed by this precipitation method. However, due to the high concentration of F ions in this wastewater, in order to improve the removal efficiency of fluoride ions and reduce the amount of chemicals added, a two-stage defluorination process is usually adopted. The basic mechanism of Haipu photovoltaic wastewater treatment adsorption defluorination method is ion exchange or surface reaction, which is a surface reaction based on contact method. The equipment using fluoride adsorbent reacts and exchanges the fluorine in the fluorine-containing wastewater with other ions or groups in the adsorbent and leaves it on the surface of the adsorbent to be removed. Haipu defluorination resin can deeply defluorinate photovoltaic wastewater, achieving deep removal of fluorides to achieve a stable effluent below 1 mg/L, taking into account cost and economic value of recovery.

The Haipu Coal Chemical Wastewater Reuse System introduces special adsorption resin after biological treatment and ultrafiltration to adsorb organic matter in the biochemical wastewater, reducing COD to below 50 mg/L and chromaticity to below 50, reducing pollution to the reverse osmosis membrane, reducing the number of cleanings, increasing service life, and lowering operating costs; at the same time, it can enhance its water production rate (water production rate can be increased from 45-50% to 65-70%).

In addition, it can also reduce the chromaticity and COD content of reverse osmosis concentrate (COD below 150 mg/L). Part of the effluent is reused as supplementary water for pool circulation, and the other part undergoes reverse osmosis desalination, collecting reverse osmosis product water and reverse osmosis concentrate.

The Haipu Coal Chemical Wastewater Reuse/Zero Discharge System couples resin adsorption with biological treatment + ultrafiltration + deep treatment + reverse osmosis + electrodialysis, achieving the resource utilization of high-salt industrial wastewater. The entire process has no liquid discharge, achieving the goal of zero discharge.

Industrial waste salt mainly comes from the production of chemical, pharmaceutical, agrochemical, and coal chemical industries, including salt-containing wastewater and solid industrial waste salt containing organic matter and other toxic substances. The main salt production processes include reaction salts from mother liquor (process wastewater), neutralization salts from acid-base chemical reactions, salting-out salts, and salt mud from distillation residue.

Due to the high cost and energy consumption of treating high-salt wastewater, resource utilization of high-salt wastewater can not only reduce treatment costs but also facilitate the recovery and utilization of salt in high-salt wastewater.

Currently, Jiangsu Haipu pre-treats the MVR feed water through special adsorption to remove organic matter and chromogenic pollutants before entering the evaporation system.

In this way, the quality of the MVR evaporated crystallized salt will be greatly improved, increasing its recycling value and significantly reducing outsourcing costs.

In terms of waste salt resource utilization, Haipu can currently complete resource recovery processes for different types of waste salt in different industries, including the production of chlorine-alkali from waste sodium chloride, the production of soda ash by metathesis of sodium sulfate, and the electrolytic preparation of sodium carbonate and ammonium sulfate (ammonium chloride) from sodium sulfate and mixed salts.

Phosphate resources are also a non-renewable resource. Currently, the phosphate industry is still expanding, and with the widespread application of lithium iron phosphate batteries in the new energy industry, the demand for phosphorus is still increasing. Given the relatively high phosphorus load in wastewater, recovering phosphorus from sewage sludge incineration ash is essential, as approximately 90% of the phosphorus in wastewater ultimately ends up in the remaining sludge.

In sludge disposal, after incineration, both water and organic matter in the sludge are consumed, leaving only about 10% of the original sludge volume as inorganic matter, which constitutes the main component. This inorganic matter contains almost all the phosphorus from the original wastewater. The significant reduction in sludge volume results in a considerably higher phosphorus content in the ash.

Wet chemical phosphorus extraction involves directly adding acid or alkali solutions to change the acid-base environment of the ash, increasing phosphorus solubility and transferring it from the solid phase to the liquid phase. Haipu can provide selective phosphorus recovery resin products to complete phosphorus resource recovery. Simultaneously, to address the inevitable leaching of heavy metals during the existing wet chemical phosphorus recovery process, Haipu can also provide highly selective ion exchange resins to remove impurities such as aluminum, iron, calcium, or aluminosilicates, separating dissolved phosphorus from heavy metals to obtain high-value phosphorus products.

Treatment and emission control of alkanes, alcohols, ethers, ketones, aromatics, esters, and organic amines waste gas.

Waste acid solutions, in addition to containing a considerable amount of residual acid, mostly also contain ferrous and ferric salts; some waste acids are characterized by high COD values and deep color. Untreated waste acid solutions pollute the environment and waste valuable resources. Haipu ion exchange resin can absorb organic matter from waste acid solutions while excluding inorganic acids and metal salts, thus achieving separation of different acids and salts. It can effectively treat various waste acids under low temperature and low pH conditions, and does not produce new waste during the process, realizing resource recovery from waste.