DAMPAK BUANGAN LUMPUR PANAS PORONG SIDOARJO TERHADAP KUALITAS AIR KALI PORONG

Abstract

Since 29 May 2006, hot mud eruption has occured at Porong-Sidoarjo East Java. The impact of hot mud
eruption is the inundation of the human settlement, school, free way, paddy field and etc. which until 30
October 06 has covered an area of about 450 ha. According to the decree of the President on 27 September
2006, mud should be discharged into Kali Porong.
The chemical and physical characteristics of mud and its water are the high rate of salinity, conductivity, and
phenol, with salinity 15.3 29.7; conductivity 33600 - 76600 ?mhos/cm. and concentrations of phenol
0.264 20.4 mg/L. The concentration of heavy metals is not too high: cadmium 0.011 0.125 mg/L;
chromium hexa valent nd 0.118 mg/L. The BOD and COD of water are 50 -75 mg/L and 100 -150 mg/L
respectively.
The impact of water and mud discharge into the Kali Porong is decrease dissolved oxygen. In the contrary,
turbidity, conductivity and salinity will increase dramatically. The concentration of heavy metal as well as
phenol showed no change. Before discharge of water, the dissolved oxygen in Kali Porong along thr river
from toll bridge to Tanjungsari varied in between 6.0-7.0 mg/L. After discharge of mud water, dissolved
oxygen decrease significantly. In period of 15 to 30 September 2006 dissolved oxygen varied in between 2.7 -
6.7 mg/L, from 1 to 30 October 2006 1.0 -4.2 mg/L and from 2 to 26 November 1.0 2.2 mg/L. The
conductivity rate at toll bridge had increased from 5406 ?mhos/cm in September to 9688 in October 2006. In
the same time salinity had increased from 2.4 to 4.0 ,and turbidity from 98 NTU to 488 NTU.