Chao Lun Pulp and Paper Mill, Guo Yang City, Anhui Province

Chao Lun pulp and paper mill is located in Guo Yang city approximately 400 km to the north-west of Hefei. The mill is a state owned enterprise which was established in 1990. It presently has a workforce of 750 workers, including 96 persons having a technical background. Its annual production capacity is of 50 000 tons. The mill operates a pulping line whose raw material is straw and nine paper machines. Recycled cardboard is also used as a raw material. In year 2000, 21 000 tons of straw pulp were produced and 12 000 tons of recycled cardboard were bought. Fresh water entering the process comes from both surface (Guo He river) and groundwater sources. The finished product consists of high strength corrugated paper. The mill sells its products to customers based in Zhejiang, Jiangsu, Guangzhou provinces as well as in Shanghai and Shenzhen.

Chao Lun mill is equipped with a biological wastewater treatment plant having a design capacity of 420 m³ per hour. It comprises primary and secondary clarifiers as well as an aeration basin. The treated effluent is monitored for COD, SS, and pH on a daily basis at the mill’s environmental laboratory and the local Environmental Protection Bureau (EPB) reviews their environmental data every three months. The treated effluent is discharged to the Guo He river which is a tributary of the Huai He river.

Based on the recent results, the CP solutions put in place (had a very positive effect on the COD content of the treated effluent discharge. In the past, the mill was out of compliance most of the time whereas presently the mill complies with COD regulation nearly 80% of the time.

So far, twenty-six CP solutions have been implemented at the mill. Out of these twenty-six CP solutions, thirteen are no cost solutions, ten are low cost, one is a medium cost, and two are high cost solutions.

CP Solution Number	Implemented CP solution	Category of Solution
1	Raw material de-dusting	No cost
2	Cooking process optimization	No cost
3	Pressure reduction for digester blow out	No cost
4	Dust removal equipment upgrade	No cost
5	Capacity increase of the black liquor extractor	No cost
6	Improve monitoring management	No cost
7	Internal technical training	No cost
8	Internal operating procedures enforcement	No cost
9	Personnel involvement for CP solution suggestions	No cost
10	Cooking time reduction and Kappa number adjustment	No cost
11	Installation of steam save all on some paper machines	No cost
12	Establishment of an equipment maintenance schedule	No cost
13	Use of recycled water to clean the floors	No cost
14	Introduction of anthraquinone in cooking process	Low cost
15	Installation of automated control for paper moisture content	Low cost
16	Addition of one extra cylinder on one paper machine	Low cost
17	Increase white water recycling rate by the addition of a new pump	Low cost
18	Fibre recovery at the inlet of the primary clarifier using rotating four screens	Low cost
19	Fibre recovery from the primary clarifier	Low cost
20	Cardboard pulping and straw pulp using white water	Low cost
21	Recovery of condensate from the paper machine	Low cost
22	Installation of a dust collecting system on the straw conveyor	Low cost
23	Installation of a new vacuum pulp washing line	Low cost
24	Recovery of waste steam from the cooking process	Medium cost
25	Construction of a white water flotation basin	High cost
26	Improvement of the black liquor extractors under the blow tanks	High cost

Contact Name: Mr. Wang Fei (General Manager)
Address: Guoyang, Anhui
Telephone : 0558-7279961
Fax : 0558-7279960