The effects of industrial effluents on the water quality and Benthic fauna of Diezmo River in Cabuyao, Laguna.

Date

10-1995

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nieva T. Librojo-Basilio

Abstract

SAMSON, JAN ALFRED FLORES. College of Agriculture - College of Arts and Sciences, October 1995. The Effects of Industrial Effluents on The Water Quality and Benthic Fauna of Diezmo River In Cabuyao, Laguna.

Adviser: Dr. Nieva T. Librojo - Basilio

The effects of industrial effluents on the water quality and benthic macroinvertebrates of Diem° river were evaluated during the dry months of March, April and May 1995.

The physico-chemical characteristics of surface water and the biological characteristics of sediments were studied. Among the parameters analyzed were pH, temperature, biochemical oxygen demand (BOD), chemical oxygen demand (COD), dissolved oxygen, total dissolved and suspended solids, chlorides, nitrates, phosphates and heavy metals (Cd, Cr, Pb). The benthic invertebrate community structures at different sites were also evaluated. Biotic indices were used to assess water quality.

The data obtained for the water quality parameters were statistically analyzed using Analysis of Variance and T-test by Least Significant Difference procedure and were found to be significantly different with respect to sampling sites and sampling time.

The values for pH, temperature and dissolved oxygen ranged from 7.4 to 7.8, 27 to 30 °C, and 2.4 to 7.8 mg/L, respectively. Total dissolved solids gave values ranging from 245 to 423 mg/L while suspended solids ranged from 5 to 51 mg/L. Nutrients gave values in the range of 0.45 to 3.25 mg/L and 0.45 to 1.48 mg/L for nitrate and total phosphorus, respectively. Oxygen demands fall with in the range of 0.1 to 21.63 mg/L for BOD and 2.05 to 76 mg/L for COD. Heavy metal concentrations were observed to be in the range of 0.598 to 1.958 ppb, < 0.062 to 4.969 ppb, and 11.69 to 39.17 ppb for cadmium, chromium, and lead, respectively.

Water quality showed a generally increasing trend in surface water contaminant concentration from upstream to downstream. Organic pollution occur at sites were industrial effluents are discharged. The discharge of factory effluents significantly contribute to the deterioration of water quality.

Industrial pollution led to the modification of benthic invertebrate community structure . the net result was the elimination of pollution-sensitive species like aquatic insects and allowing pollution tolerant groups such as Oligochaete worms and Chironomid larvae to proliferate.

The results showed that surface water upstream cm still be used for domestic water supply class I I (DENR classification) while contamination downstream restricts the water usage for purposes such as irrigation and industrial cooling operations. This conclusion was reinforced by the results of the biological survey. Lincoln water quality indices showed that upstream waters have pristine quality while very poor water quality were observed downstream.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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