The high-salinity water zero-discharge project of Sinopec Great Wall Energy Chemical (Ningxia) Co., Ltd. has been completed and put into operation
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The first coal chemical high-salinity wastewater zero-discharge demonstration plant of Sinopec, for which the EPC general contracting was carried out by Ningbo Engineering Company of the Refining and Chemical Engineering Group, has been put into operation. This is the high-salinity wastewater zero-discharge project of Sinopec Great Wall Energy Chemical (Ningxia) Co., Ltd., which utilizes domestically developed \"zero-discharge\" technology packages; its operation has broken the foreign technological monopoly in this field. This project is the first set of zero-discharge systems for coal chemical high-salinity wastewater in China to utilize domestic technology, and it is also the first such system to employ a combination of reduction and evaporation crystallization processes. The project includes two sets of devices: a reduction device and an evaporation crystallization device. The reduction device is composed of 9 units, namely an inlet water lifting unit, an ozone treatment device, a BAF treatment device, a pretreatment plant, a combined plant for chemical dosing, a combined plant for reduction treatment, an intermediate water tank, an instrument room, and internal pipe corridors for the devices ； The evaporation crystallization unit consists of two components: the evaporation crystallization combined plant and the crystallization framework. Once the Blue Waters and Clear Skies project at Sinopec is put into operation, its system will be able to achieve a water recovery rate of over 99%. Not only will not a single drop of brine wastewater be discharged, but the quality of the recycled water will also be far superior to that of fresh water. As a result, Sinopec Great Wall Energy Chemical (Ningxia) Co., Ltd. can reduce the discharge of 450 cubic meters of brine wastewater per hour, while simultaneously saving 447 cubic meters of fresh water per hour. Over the course of a year, this translates to a water savings of 3.5 million tons, with cost savings in water procurement exceeding 10 million yuan.
It depends on how it performs after going into operation; we’re looking forward to it
The so-called zero wastewater discharge nowadays actually involves shifting from liquid waste to solid waste or gaseous waste. But it’s still much better than not reusing water at all.
Was MVR evaporation crystallization not used for evaporation crystallization?
One more – our factory also achieves near-zero emissions, having basically accomplished it
We can also achieve zero discharge of saline wastewater, and there are two methods for this: Method 1 involves using high-pressure flat membranes to concentrate the saline water with a salt content of less than 10% or 5%, thereby reducing its volume, and then employing multi-effect evaporation or MVR evaporation to carry out evaporation crystallization and produce solid salt. Method 2 involves direct evaporation crystallization using multi-effect evaporation or MVR evaporation, which is mainly applicable to saline wastewater with concentrations of 5% or 10% or higher. It can be said that the technical challenges associated with zero wastewater discharge are not significant; the biggest difficulty lies in economic viability. Next, we need to achieve the classified recycling of salts, and this once again turns into a technical challenge!
Are the high-salt wastewater from coal chemical industries salts such as sodium sulfate?