1. Profile

(1) Project site:

Karachi, Pakistan.

(2) Owner:

Pakistan Refinery Limited.

(3) Capacity:

100 m³/h condensate treatment.

(4) Date of operation:

August 2017.

(5) Investment, construction and operation:

It was invested, built and operated by the Owner and China Haohua Chemical Group Co., Ltd. was the EPC contractor of wastewater treatment.

2. Major environmental problems to be addressed

Treatment of oily condensate and recycling of reclaimed water.

3. Environmental standards and/or main index limits to be followed

According to the Water Quality for Industrial Boilers (GB 1576-2008), for the effluent, pH 8.8~9.3, turbidity≤2 NTU, hardness≤0.03 mmol/L, conducticvity≤0.2 μs/cm, TOC≤0.2 mg/L, silicon dioxide≤0.015 mg/L, SS≤1 mg/L.

4. Technological process

Condensate influent within the battery limit→ plate heat exchanger → intermediate tank of condensate→ low-pressure condensate pump → activated carbon filtration + mixed bed filtration → purified water tank of condensate→ reclaimed water pump → water point.

5. Environmental pollution control effects

For the influent, pH8~9, conductivity 5-10 μs/cm, total hardness 0.8-2.0 mg/L, chloride ion 1~4 mg/L, total alkalinity 2-5 mg/L, SS30 mg/L, COD60 mg/L, petroleum pollutant 5 mg/L; for the quality of produced water after treatment, pH 8.8~9.2, conducticvity≤0.2 μs/cm, silicon dioxide≤0.01 mg/L and SS≤0.5 mg/L.

6. Social benefits

The project contributed to local water pollution control. The project provided jobs to local people and trained a number of technical and engineering personnel for the local community.

7. Economic benefits

After the project was put into operation, the oily condensate was treated and reused as boiler make-up water, saving fresh water consumption and bringing direct economic benefits to the Owner.

Project significance: The project brought green, environmental and sustainable concepts and technologies to Pakistan, and played a major role in promoting the local environmental protection capability.