ZLD (Zero Liquid Discharge) technology for Inner Mongolia pharmaceutical wastewater treatment

Project Overview

Qilu Pharmaceutical (Inner Mongolia) Co., Ltd., located in Hohhot City, Inner Mongolia Autonomous Region, is a large-scale modern enterprise producing bio-fermentation products and preparations. It mainly manufactures bio-fermentation products and preparations, among which avermectin production scale is among the highest in the world.

In the past, the circulating water drainage and desalinated water discharged from the existing projects in the plant area were discharged into the second unit of the 10000 m3/d sewage treatment plant. The large amount of waste water was a  big burden on the sewage treatment station and a waste of water resources. Therefore, the manufacturer organized relevant technical personnel to discuss and research, and tested this part of high-concentration wastewater. The water quality showed that the wastewater had higher turbidity, more suspended solids, high salt and hardness, and conductance.

It seemed unreasonable to directly discharge it into the wastewater treatment plant because this would increase both the treatment burden and cost with undesirable results. After investigating the market and communication with different water treatment factories, the manufacturer decided to purchase a set of 2000m³/d reuse water treatment system.

Solution: Our Treatment Technology

Our company won the contract from the manufacture for a set of 2000m³/d reuse water treatment system. Our 2000m³/day reuse water treatment system is mainly composed of pretreatment technology and integrating membrane technology with gross recovery rate over 98%. The treated water quality of the system can be used as the effluent of the raw water of the desalinated water station and the circulating water system.

Our contract was signed in November 2016. The construction site was completed within next the few months. Our equipment was delivered to the project site on March 15, 2018. The high-quality recycled water was produced on June 15, 2018 on the commencing of the commissioning stage. On August 27, 2018, the project was accepted by the project owner and the operation was transferred from us.

The result of this project

At present, the amount of recycled water that can be produced per day is about 1367.76 tons, which is about 500,000 tons of fresh water that can be saved every year. The by-product mixed salt 3.38t/d is being recycled.


By replenishing water for the system through discharged water reuse, this project has realized resource reuse through harmless wastewater treatment. The project achieves long-term benefits from a one-time investment. Meanwhile, this project reduces the production costs and wastewater discharge, thereby increasing the manufacturer’s product competitiveness and market share.