Treatment of industrial wastewater by chemical coagulation

Date

11-1998

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Elvira T. Tumlos

Abstract

The use of guar gum, alum, and ferric chloride as well as their combinations were investigated to treat synthetic and industrial wastewaters. The treatment involves the addition of different concentrations (20, 100,200, 300, 400, 500, 1000, and 2000 mg/L) of guar gum, 300 mg/L alum, and 300 mg/L ferric chloride, and varying concentration ratios (50:50, 60:40, 70:30, and 80:20) of guar gum:alum and (50:50, 60:40, 70:30, and 80:20) guar gum:ferric chloride. The speed and time of stirring as well as settling time of the coagulation process were constant in all treatments. Synthetic wastewater was added with individual and combined coagulants to assess their effectivity in reducing turbidity, total suspended solids (TSS), and chemical oxygen demand (COD), as well as in maintaining pH to the regulatory standards. Results showed that the best two combinations were T1 (50:50 guar:alum) and T4 (80:20 guar:alum). The former reduced TSS and turbidity by 92.4% and 74.4%, respectively. The latter reduced turbidity by 84.2% and TSS by 83.3%. The COD level after both treatments increased. Both combination ratios made the wastewater acidic. TI and T4 were also used to treat textile, pulp and paper, and food industries wastewaters. For textile wastewater, turbidity was reduced from 32.5 to 7.3 NM (77.7%) while TSS from 100 to 40 mg/L (60.0%). For pulp and paper mill wastewater, turbidity was reduced from 90 to 15 NTU (83.3%) while TSS from 110 to 55 mg/L (50.0%). For food industry wastewater, turbidity and TSS were reduced from 54 to 17 NTU (68.5%) and from 195.0 to 87.5 mg/L (55.1%), respectively. COD increased while pH slightly decreased in all the wastewaters. Except for COD, all the parameters were within the prescribed DENR regulatory effluent standards. Aeration for one to two hours was also conducted to the three industrial wastewaters to reduce the COD levels. Results showed that COD levels were reduced in all wastewaters after two hours aeration but not to the level within the regulatory standards.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1998 C4 M38

Document Type

Thesis

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