Section headings and selected papers: Pond Systems and Land Treatment. Introduction to advanced integrated wastewater ponding systems, W J Oswald. Options for the rational design and operation of oxidation ponds, J B Carberry. Bilateral wastewater land treatment research by China and the USEPA, L E Leach et al . Technical and economic analysis of stabilization ponds, M Nie et al . Removal of nutrient salts in relation with algae in ponds, J Li et al . Temperature influence on performance of oxidation ponds, Q Zhao & Z Zhang. ;xperimental studies on the purification of wastewater in water peanut ponds, H Xu et al . Anaerobic Treatment. Evaluation of COD removal performance based on organic acid decomposition in an anaerobic fixed bed reactor, M Kuroda & Y Sakakib;ra. Basic studies on anaerobic degradation of glucose in continuous stirred tank reactors, M Nakamura et al . The performance of a heat exchanger type anaerobic biofilm reactor, C R Escalera & S Uchida.; Other Topics. Appropriate technology hygiene facility for small communities, M Anda et al . Treatment, reuse and disposal of drainage waters, E W Lee. A study of simultaneous organics and nitrogen removal by extended aeration submerged biofilm process, B Wang et al . Removal of organochlorine compounds in an upflow flocculated algae photobioreactor, X F Wu & N Kosaric; Low-cost and low-energy wastewater treatment systems: a South African perspective, A Batchelor et al . Constructed wetlands for wastewater treatment: the New Zealand experience, R Bhamidimarri et al . Subject index.