| Summary: | The Sewon wastewater treatment plant was functioned as domestik waste with
organic substances content of human discharge. Based on the existing data the waste water
coming in and out and the resulting sludge of the Sewon waste water treatment installation
contained heavy metals were classified into hazardous and toxic (Bahan Berbahaya dan
Beracun [B3]). This research aim to identifying the hazardous and toxic waste source in order
to find out the kind of the compound and the metal concentration of the Sewon waste water
treatment installation and technical solutions that can be done by the relevant stakeholders.
The data was collected using purposive sampling. The sampling was carried out on
the basis of the industri locations through which the Sewon waste water treatment installation
network went and the possibility that the industries organized their production process.
Subsequently, the samples were tested in laboratory. The parameters of the tested waste water
were adjusted to the kinds of the industries, the raw materials used and the production process
of the industries.
The results of the study showed that essentially one of the characteristics of the
domestik waste water was heavy metal content. The heavy metals came not only from
domestik waste, but also from industries. The industri discharging their waste into IPAL
Sewon network was of the kind of batik one. Meanwhile, the leathier tanning industri was
only suspected to discharge the waste to the IPAL Sewon because of the limited access to the
industri. The Ni content of the effluent of the batik industri was 0.909 mg/l and the Cr content
of the effluent of the leather tanning industri was 11.714 mg/l. It was necessary for the
industries to improve their waste treatment installation to reduce the hazardous and toxic
waste impact. Additionally, it was also necessary for the Balai IPAL Sewon to formulate new
SOP and to regularly monitor the industrial waste.
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